According to the midrash quoted by Rashi, the baby Moshe refused to nurse from non-Jewish women, although this is not the way we use the term Chalav Yisrael in this article.

Question:

Dr. Levy asks me the following: “Friends of ours keep chalav Yisrael, but they will use foods made with non-chalav-Yisrael powdered milk. But I know from my professional work that one can purchase powdered mare’s (female horses) and camel’s milk – they are considered specialty items. So, why is there any difference between using non-chalav- Yisrael powdered milk and non-chalav Yisrael fluid milk?”

The Mishnah (Avodah Zarah 35b, 39b) proscribes consuming milk that a gentile milked unless a Jew supervised the milking, a prohibition called chalav akum, out of concern that the milk may have been adulterated with milk of a non-kosher species. In a different article (The Milky Whey), I noted that there are several opinions as to how to define the prohibition. The most lenient approach is that of the Pri Chodosh (Yoreh Deah 115:15), who understands that one needs to be concerned about chalav akum only when the non-kosher milk is less expensive than the kosher variety, or it is difficult to sell. However, when kosher milk is less expensive, the Pri Chodosh contends that one does not need to be concerned that the gentile would add more expensive specialty non-kosher milk into regular, kosher milk.

On the other side of the spectrum, the Chasam Sofer maintains that the prohibition has a halachic status of davar shebeminyan, a rabbinic injunction that remains binding, until a larger and more authoritative body declares the original sanction invalid, even when the reason the takanah was introduced no longer applies (see Beitzah 5a). Since a more authoritative beis din never rescinded the prohibition on unsupervised gentile milk, consuming this milk involves a serious violation. The Chasam Sofer requires that a Jew must be able to observe the milking, and if not, the produced milk is completely non-kosher because of the rabbinic injunction, even when the non-Jew has no incentive to adulterate the product.

In between these two positions, there is the opinion of Rav Moshe Feinstein and the Chazon Ish (Yoreh Deah 41:4) that in a place where non-kosher milk commands a higher price than kosher milk, it is still prohibited to use non-supervised milk. However, Rav Moshe understands that the takanah did not specifically require that a Jew attend the milking, but that one is convinced that the milk has no admixture of non-kosher. However, whenever it is certain that the kosher milk is unadulterated, halacha considers the milk “supervised” (Igros Moshe, Yoreh Deah 1:47).

How can one be certain? The Mishnah recommended an obvious way: have a Jew nearby who may check at any moment. Of course, this method is not foolproof, but halacha did not require more.

Is there another way that one can be certain? Allow me to use my own example to explain Rav Moshe’s approach. Dr. Levy, our questioner, runs laboratory tests on a sample of unsupervised milk and concludes, with absolute certainty, that it is 100% sheep’s milk. However, no Jew supervised the milking. Is the milk kosher?

According to Rav Moshe’s analysis, this milk is certainly kosher, since we can ascertain its source.

In his earliest published teshuvah on the subject, Rav Moshe explained that when the government levies fines for adulteration of cow’s milk, the fear of this fine is sufficient proof that the milk is kosher. In later teshuvos, he is very clear that other reasons why we can assume that the milk is kosher are sufficient proof, including that normal commercial enterprises assume that standard milk is bovine milk (Igros Moshe, Yoreh Deah 1:48, 49).

Being stringent

Although Rav Moshe concludes that where one can rely that the standardly available milk is kosher there is no prohibition of chalav akum, he still rules in a different teshuvah that a chinuch institution should use only chalav Yisrael products, even if all the children come from homes that do not use chalav Yisrael exclusively. He contends that part of chinuch is to show children that one follows a stricter standard, even when halacha does not necessarily require one.

Powdered milk

We can now address the question mentioned above: “Friends of ours keep chalav Yisrael, but they will use foods made from non-chalav-Yisrael powdered milk. But I know from my professional work that one can purchase powdered mare’s and camel’s milk – they are considered specialty items. So, why is there any difference between using non-chalav- Yisrael powdered milk and non-chalav-Yisrael fluid milk?”

Those who allow use of non-chalav-Yisrael milk powder follow the opinion presented by Rav Tzvi Pesach Frank, Rav of Yerushalayim until his passing a little over sixty years ago and one of the greatest poskim of his era. Rav Frank assumed that the halacha follows the Chasam Sofer, who requires Jewish supervision to permit the non-Jewish milk, and did not accept the heterim of the Pri Chodosh, nor that of the Igros Moshe and the Chazon Ish. Nevertheless, Rav Frank permitted powdered milk from an unsupervised gentile source, for a very interesting reason.

The poskim permit using cheese that is gevinas Yisrael and butter, even when these products are made from unsupervised milk. (I discussed both of these topics in other articles — How Do We Make Kosher Cheese?, and The Great Cottage Cheese Controversy). Why did they permit this? Because non-kosher milk is low in casein, and, therefore, it does not curd, which is the first step in producing cheese. It is also low in milkfat (also called butterfat or cream), which makes it nonprofitable to make butter from non-kosher milk. (Those curious are invited to read the highly entertaining responsum of the Melamed LeHo’il, 2:36:2, on this topic.) For these reasons, even in the days of Chazal, one could assume that a gentile would not add non-kosher milk when he intends to produce either cheese or butter, and therefore, these items were excluded from the prohibition of chalav akum.

May powdered milk be treated like cheese and butter?

Rav Frank notes that there is a qualitative difference between cheese and butter, on the one hand, and powdered milk, on the other, in that there is an inherent difficulty with making cheese and butter from non-kosher milk, whereas one can easily powder any milk. (This is precisely Dr. Levy’s question I mentioned above.) Thus, one could argue that the leniency that applies to cheese and butter should not apply to milk powder.

However, Rav Frank quotes the Ritva (Avodah Zarah 35b) who pointed out that, technically, one could make cheese even from non-kosher species, but the cheese yield from these milks is very poor, and when the milk curds, most of it becomes whey. Thus, although it is theoretically possible to make cheese or butter from non-kosher milk, the halacha does not require one to be concerned about this. Rather, one may assume that a gentile would not adulterate this milk. It is indeed noteworthy that while researching milk and cheese made the world over, I discovered cheeses made from the milk of cows, sheep, goats, water buffalo and yak, all of them kosher species, and milk used from non-kosher mammals such as donkeys, mares, llamas and camels, but I found not a single populace making any variety of cheese from the non-kosher milk. Thus, although the Ritva attests that it could be done, it is simply not worthwhile.

Rav Frank concludes that what permits the unsupervised milk used in cheese and butter is not that it is impossible to use non-kosher milk but that it is unlikely. Thus, he reasons, although one can powder non-kosher milk, the prohibition of chalav akum was limited to fluid milk and other products available in the days of Chazal which could be made easily from non-kosher milk. Since powdered milk did not exist in the days of Chazal, and since we are certain that standardly available powdered milk is of bovine origin, the prohibition against chalav akum does not apply to milk powder, just as it does not apply to butter and cheese.

We should note that the Chazon Ish took strong issue with Rav Frank’s position treating milk powder differently from fluid milk. The Chazon Ish contends that the lenience that applies to cheese and butter applies only because these products, inherently, are not made from non-kosher milk, a logic that does not apply to milk powder.

Thus, Dr. Levy’s friends who keep chalav Yisrael but use foods made with non-chalav Yisrael powdered milk follow the conclusion of Rav Pesach Frank, whereas those who are strict regarding milk powder follow the Chazon Ish’s approach. In Eretz Yisrael, this has become one of the major defining factors for the difference between what is called mehadrin (stricter) kashrus standard, and non-mehadrin hechsherim. The regular hechsherim allow use of non-chalav Yisrael milk powder (imported from the United States), whereas the mehadrin hechsherim use only chalav Yisrael products. (By the way, no Eretz Yisrael hechsher allows the use of unsupervised fluid milk as kosher; all hechsherim, both mehadrin and non-mehadrin, have accepted the position of the Chasam Sofer.)

The custom of eating dairy on Shavuos has a long history; certainly, we should review the topic of…

Does Chalav Yisrael Apply Today?

Question #1:

Shirley mentions to her friend: “I do not understand why some people keep chalav Yisrael today. Do they really think that someone is adding pig’s milk?”

Question #2:

Muttie inquires: “My friend quoted his rav that it is more important to keep chalav Yisrael today than it ever was before. How could this be?”

Chazal (Bechoros 6b) derive from this week’s parsha a rule that whatever comes from a non-kosher species, such as eggs or milk, is also non-kosher. Thus, milk of mares, camels, llamas, donkeys or sows are all non-kosher. Still, people find chalav Yisrael a perplexing subject matter. We have all heard various authorities quoted that today use of chalav Yisrael is only a chumrah, whereas others rule that consuming non-chalav Yisrael foods is a serious infraction of halacha. The mission of this article is to provide appreciation of the issues involved. So, let us start from the beginning of the topic by understanding the origins of this proscription and then explaining the different approaches why it does or does not apply today.

Before we even begin our halachic discussion, we need some biological and food production information. The definition of a mammal is an animal that nurses its young with mother’s milk. (The Modern Hebrew word for mammal is yoneik, literally, that which nurses, meaning that the young suckles mother’s milk.) Hashem, who provides for all His creatures, custom-developed a formula that provides the ideal nourishment for the young of each mammalian species. This supplies the perfect “food pyramid” balanced diet with all the proteins, carbohydrates, vitamins and minerals that a young growing foal, cub, kitten, puppy, kid, lamb, infant or calf need to thrive and mature until they are ready for an adult diet, which in many species is when they are ready to earn their own living.

There are thousands of species of mammals, yet each species’ milk is somewhat unique. The young of kosher animals require a certain protein, called casein, in higher proportions than do the young of non-kosher animals, and therefore Hashem made kosher milk with a higher proportion of casein. Non-kosher milk, of course, also contains significant amount of protein necessary for a young growing mammal, but most of this protein is categorized as “whey protein.” (When I use the term “non-kosher milk” in this article, I will be referring to milk from non-kosher species.) Kosher milk also contains whey protein, but in much smaller proportion to the casein.

The Origins of Chalav Yisrael

The Mishnah (Avodah Zarah 35b, 39b) proscribes consuming milk that a gentile milked, unless a Jew supervised the milking, a prohibition called chalav akum. The Gemara notes that we are not concerned that the gentile is misrepresenting non-kosher milk as kosher — milk from non-kosher species looks different from kosher milk, and this would be easily identified. Rather, the prohibition is because the milk may have been adulterated with milk of a non-kosher species. The Gemara subsequently discusses how closely must the Jew supervise the milking; it concludes that, when the gentile has both kosher and non-kosher animals that could be milked, the Jew may be sitting in a place where he cannot observe the milking, provided that, should he stand up, he could. Since the Jew can stand up at any moment, we may assume that the gentile would not risk milking his non-kosher animal and losing the Jew’s business. Therefore, this milk still qualifies as kosher chalav Yisrael, milk supervised by a Jew.

On the other hand, should the gentile have only kosher species in his herd, the Gemara implies that less supervision is necessary, but it does not define exactly how much. The milking still requires the attendance of a Jew, but halachic authorities dispute the reason and purpose of the Jew’s presence. This dispute is what underlies the controversy alluded to above.

The most lenient approach

The most lenient approach is that of the Pri Chadash (Yoreh Deah 115:15), who contends that there are concerns about chalav akum only when non-kosher milk is less expensive than kosher, or when non-kosher milk is obtainable but difficult to sell. However, when kosher milk is less expensive than non-kosher, halacha has no concern that non-kosher product may contaminate kosher milk. The Pri Chadash reports that, at the time that he wrote his commentary, he was living in Amsterdam, and the vast majority of the Torah community there accepted this interpretation and drank milk sold by gentiles. He adds that he himself relied on this approach and drank the milk. The Pri Chadash explains that halacha does not require that a Jew observe the milking, nor is there any requirement to verify that non-kosher milk was not added. The Mishnah and Gemara require a Jew to supervise the milking only when it is financially advantageous for the non-Jew to adulterate milk.

Chasam Sofer’s approach

On the other hand, the Chasam Sofer (Shu”t Yoreh Deah #107) opposed any lenience to use milk from gentiles. He maintained that Chazal required that a Jew actually supervise the milking, and that this sanction remains binding, even should its rationale no longer apply, until a more authoritative body retracts it (see Beitzah 5a). Since this has never happened, consuming unsupervised gentile milk remains prohibited. The Chasam Sofer requires that a Jew observe (or be able to observe) the milking, even when no incentive exists to adulterate the product.

Risk of snake bite

Chazal (Bava Basra 110a; Avodah Zarah 27b) invoke the verse uporeitz geder yishachenu nachash (Koheles 10:8) to mean thatsomeone violating a rabbinic injunction deserves to be bitten by a snake, indicating the importance of observing rabbinic prohibitions. The Chasam Sofer writes that someone who ignores the rabbinic prohibition of chalav akum and drinks milk, relying that the gentile would not add non-kosher milk, should be categorized as a poreitz geder deservant of the punishment of yishachenu nachash.

Furthermore, the Chasam Sofer contends that even should kosher milk be cheaper than non-kosher, since the Jewish people rejected the ruling of the Pri Chadash, unsupervised dairy products are prohibited because of the laws of nedarim, vows. Since Jews do not consume chalav akum even in places where non-kosher species are not milked, it is considered that they accepted a vow to prohibit unsupervised milk. As a result, the Chasam Sofer rules that it is prohibited min HaTorah, with the full stringency of a vow, to consume unsupervised milk.

A middle road

An approach between these two positions, that of Rav Moshe Feinstein and the Chazon Ish (Yoreh Deah 41:4), who contend that in a place where non-kosher milk commands a higher price than kosher milk, it is still prohibited to use non-supervised milk. However, Rav Moshe understands that the takanah did not require specifically that a Jew attend the milking, but that one must be completely certain that the milk has no admixture of non-kosher. When it is certain that the kosher milk is unadulterated, halacha considers the milk to be “supervised” (Shu”t Igros Moshe, Yoreh Deah 1:47).

How can one be certain? The Mishnah recommended the most obvious way: have a Jew nearby who may enter at any moment. Of course, we realize that even this method is not foolproof, but it is as thorough as halacha requires.

Is there another way that one can be certain? Someone runs laboratory tests on some unsupervised milk and concludes, with absolute certainty, that it is 100% sheep’s milk. Yet, no Jew supervised the milking. Is the milk kosher?

According to Rav Moshe’s analysis, this milk is certainly kosher since we can ascertain its source.

In his earliest published teshuvah on the subject, Rav Moshe explained that, when the government fines those caught adulterating cow’s milk, the fear of this consequence is sufficient proof that the milk is kosher. In later teshuvos, he is very clear that other reasons why we can assume that the milk is kosher are sufficient proof, including that normal commercial practice is that standard milk is bovine milk (Igros Moshe, Yoreh Deah 1:48, 49). One should note that the Chazon Ish agrees with Rav Moshe’s approach. We should also note that this heter applies only where the absolute assumption is that the milk is from kosher species, but not anywhere where camel’s milk, mare’s milk or milk from other non-kosher species is commonly sold or available.

Being Stringent

Rav Moshe concludes that, even where one can rely that the standardly available milk is kosher, and there is therefore no prohibition of chalav akum, a chinuch institution should use only chalav Yisrael products, even when all the children come from homes that do not use chalav Yisrael exclusively. He notes that this is an aspect of chinuch – to teach the importance of following a stricter standard than halacha necessarily requires.

Contemporary Problem

There is another reason why some poskim require use of chalav Yisrael today. This is because of the common occurrence in the contemporary world of a veterinary problem affecting dairy cows called displaced abomasums, which is often treated in a way that may render this cow’s milk non-kosher. I will discuss this topic a different time.

At this point, we can answer Shirley’s question: “I do not understand why some people keep chalav Yisrael today. Do they really think that someone is adding pig’s milk?”

Indeed, even in the time of the Gemara, it was probably unheard of for anyone to add pig’s milk or, for that matter, for anyone to use pig’s milk, since sows are almost impossible to milk. Although most non-kosher species do not allow themselves to be milked (have you ever tried to milk a cat?), camels, llamas, alpacas, donkeys, and mares can all be milked and produce a palatable product. Contemporarily, there is extensive research at Ben Gurion University about use of antibodies found in camel’s milk for treatment of autoimmune diseases. I have been asked about using this milk, which is clearly non-kosher, but is permitted in case of a life-threatening ailment.

To answer Shirley’s question succinctly: Although we can assume that the milk on your supermarket shelf is unadulterated cow’s milk, the Chasam Sofer still rules that Chazal prohibited consuming this milk. In his opinion, this prohibition is in full effect today, even when the reason for the takanah no longer applies. Furthermore, he suggests that the prohibition to use this milk might even be min haTorah . Other rabbonim have voiced other concerns about the kashrus of unsupervised dairy cows.

Stricter than Ever?

At this point, let us examine Muttie’s question: “My friend quoted his rav that it is more important to keep chalav Yisrael today than it ever was before. How could this be?”

One obvious reason for this rav’s position is that he holds like the Chasam Sofer that using non-chalav Yisrael incurs a Torah prohibition of violating vows. Furthermore, he may feel that since being lenient on this issue is so rampant, one must demonstrate the importance of this mitzvah. He also may be concerned about the displaced abomasums problem, and holds that this prohibits the milk min haTorah.

In Conclusion

Notwithstanding that the Chazon Ish writes several reasons why unsupervised milk is permitted, he never allowed its use. Rav Moshe similarly advocates being strict, and himself did not rely on the heter. It is also well known that Rav Eliezer Silver traveled across North America by train and took his own chalav Yisrael milk with him as he went. (I have no idea why it did not spoil en route.) In conclusion, I suggest clarifying with your rav whether you should rely on using non-chalav Yisrael milk.

Question #1:

Shirley mentions to her friend:  “I do not understand why people are concerned about using only chalav Yisrael. Do they really think that someone is adding pig’s milk?”

Question #2:

Muttie inquires: “My friend quoted his rav that it is more important to keep chalav Yisrael today than it ever was before. How could this be?”

Chazal (Bechoros 6b) derive from this week’s parsha a rule that whatever derives from a non-kosher species, such as eggs or milk, is also non-kosher, and thus milk of mares, camels, llamas, donkeys or sows are all non-kosher. Still, people find chalav Yisrael a perplexing matter. We have all heard various authorities quoted as saying that today use of chalav Yisrael is only a chumrah, whereas others rule that consuming non-chalav Yisrael foods is a serious infraction of halacha. The mission of this article is to provide appreciation of the issues involved. So, let us start from the beginning of the topic by understanding the origins of this proscription and then explaining the different approaches as to why it does or does not apply today.

Before we even begin our halachic discussion, we need some biological and food production information. The definition of a mammal is an animal that nurses its young with mother’s milk. (The Modern Hebrew word for mammal is yoneik, literally, that which nurses, meaning that the young suckles mother’s milk.) Hashem, who provides for all His creatures, custom-developed a formula that provides the ideal nourishment for the young of each mammalian species. This supplies the perfect “food pyramid” balanced diet with all the proteins, carbohydrates, vitamins and minerals that a young growing foal, cub, kitten, puppy, kid, lamb, infant or calf needs to thrive and mature until it is ready for an adult diet, which in many species is when it is ready to earn its own living.

There are thousands of species of mammals, yet each species’ milk is somewhat unique. The young of kosher animals require a certain protein, called casein, in higher proportions than do the young of non-kosher animals, and therefore Hashem made kosher milk with a higher proportion of casein. Non-kosher milk, of course, also contains significant amount of protein necessary for a young growing mammal, but most of this protein is categorized as “whey protein.” (When I use the term “non-kosher milk” in this article I will be referring to milk from non-kosher species.) Kosher milk also contains whey protein, but in much smaller proportion to the casein in the milk.

The Origins of Chalav Yisrael

The Mishnah (Avodah Zarah 35b, 39b) proscribes consuming milk that a gentile milked, unless a Jew supervised the milking, a prohibition called chalav akum. The Gemara notes that we are not concerned that the gentile is misrepresenting non-kosher milk as kosher — milk from non-kosher species looks different from kosher milk, and this would be easily identified. Rather, the prohibition is because the milk may have been adulterated with milk of a non-kosher species. The Gemara subsequently discusses how closely must the Jew supervise the milking, concluding that when the gentile has both kosher and non-kosher animals that could be milked, the Jew may be sitting in a place where he/she cannot observe the milking, provided that should he/she stand up he would be able to observe the milking. Since the Jew can rise to his feet at any moment, we may assume that the gentile would not risk milking his non-kosher animal and losing the Jew’s business. Therefore this milk still qualifies as kosher chalav Yisrael, meaning milk that was supervised by a Jew.

On the other hand, should the gentile have only kosher species in his herd, the Gemara implies that the Jew does not need to maintain as close supervision, but it does not define exactly how much supervision is required. Although the milking still requires the attendance of a Jew, the halachic authorities dispute the reason and purpose of the Jew’s presence. This dispute is what underlies the controversy alluded to above.

The most lenient approach

The most lenient approach to the question of chalav akum is that of the Pri Chodosh (Yoreh Deah 115:15), who understands that one needs to be concerned about chalav akum only when the non-kosher milk is less expensive than the kosher variety, or when the non-kosher milk is difficult to sell. However, when kosher milk is less expensive, he contends that one does not need to be concerned that the gentile would add more expensive, specialty non-kosher milk into regular kosher milk. The Pri Chodosh reports that he was living in Amsterdam at the time that he wrote his commentary (he subsequently relocated to Eretz Yisrael), and the vast majority of the Torah community there drank the milk sold by gentiles and did not consider it to be chalav akum. He further adds that he himself relied on this approach and drank this milk. The key point of the Pri Chodosh is that there is no requirement that a Jew actually observe the milking, nor is there even a requirement that one be absolutely certain that no non-kosher milk was added. It is sufficient that there be no incentive for the gentile to add non-kosher milk to his product, and the Mishnah and Gemara that required a Jew to supervise the milking did so only when the gentile had some motivation to adulterate the milk.

The Chasam Sofer’s approach

On the other hand, the Chasam Sofer (Shu”t Yoreh Deah #107) took tremendous umbrage at people who were lenient in the use of milk from gentiles. He maintained that Chazal required that a Jew actually supervise the milking and that, furthermore, should their reason no longer apply, the rabbinic injunction remains binding until a larger and more authoritative body declares the original sanction invalid (see Gemara Beitzah 5a). Since a more authoritative beis din never rescinded the prohibition on unsupervised gentile milk, consuming this milk constitutes a serious violation. The Chasam Sofer requires that a Jew be on hand to observe (or be able to observe) the milking, and if a Jew is not there, the produced milk is completely non-kosher because of the rabbinic injunction, even when there is no incentive for the non-Jew to adulterate the product.

Risk of Snake Bite

Chazal (Bava Basra 110a; Avodah Zarah 27b) invoke the verse uporeitz geder yishachenu nachash  to mean that someone who violates a rabbinic injunction deserves to be punished by being bitten by a snake, an indication that people should be exceedingly careful not to ignore rabbinic prohibitions (see Koheles 10:8). The Chasam Sofer writes that someone who ignores the rabbinic prohibition of chalav akum and drinks milk relying on the assumption that the gentile would not add non-kosher milk should be categorized as a poreitz geder, deserving of the punishment of yishachenu nachash.

Furthermore, the Chasam Sofer contends that even if the Pri Chodosh is correct that when kosher milk is cheaper than non-kosher milk the prohibition of chalav akum does not apply, since the Jewish people rejected this ruling of the Pri Chodosh, we are prohibited from consuming dairy products that a Jew did not supervise because of the laws of nedarim, vows. Since Jews did not use chalav akum even in places where non-kosher species are not milked, it is considered that they accepted a vow to prohibit unsupervised milk. As a result, the Chasam Sofer rules that it is prohibited min HaTorah to consume unsupervised milk, with the full stringency of a vow.

One in-between position

There is an approach in between these two positions, that of Rav Moshe Feinstein and the Chazon Ish (Yoreh Deah 41:4), who contend that in a place where non-kosher milk commands a higher price than kosher milk, it is still prohibited to use non-supervised milk. However, Rav Moshe understands that the takanah did not specifically require that a Jew attend the milking, but that one is completely certain that the milk has no non-kosher admixture. However, when one is certain that the kosher milk is unadulterated, halacha considers the milk to be “supervised” (Shu”t Igros Moshe, Yoreh Deah 1:47).

How can one be certain? The Mishnah recommended the most obvious way: have a Jew nearby who may enter at any moment. Of course, we realize that even this method is not foolproof, but it is as thorough as halacha requires.

Is there another way that one can be certain? Allow me to use my own example to explain Rav Moshe’s approach. Someone runs laboratory tests on some unsupervised milk and concludes with absolute certainty that in front of him is 100% sheep’s milk. However, no Jew supervised the milking. Is the milk kosher?

According to Rav Moshe’s analysis, this milk is certainly kosher, since we can ascertain its source.

In his earliest published teshuvah on the subject, Rav Moshe explained that when the government fines those caught adulterating cow’s milk, the fear of this consequence is sufficient proof that the milk is kosher. In later teshuvos, he is very clear that other reasons why we can assume that the milk is kosher are sufficient proof, including that normal commercial practice is that standard milk is bovine milk (Igros Moshe, Yoreh Deah 1:48, 49). One should note that the Chazon Ish also agrees with Rav Moshe’s approach.

Being Stringent

Although Rav Moshe concludes that where one can rely that the standardly available milk is kosher there is no prohibition of chalav akum, he still rules in a different teshuvah that a chinuch institution should use only chalav Yisrael products even if all the children come from homes that do not use chalav Yisrael exclusively. He contends that part of chinuch is to show children that one follows a stricter standard, even when halacha does not necessarily require one.

Contemporary Problem

There is another major reason why some poskim who in general accept the lenient approaches regarding the prohibition of chalav akum feel that one should be stringent today. This is because of the common occurrence of a veterinary problem that affects dairy cows called displaced abomasums, which is often treated in a way that may render this cow’s milk non-kosher. I will discuss this topic a different time.

At this point, we can answer Shirley’s question, which I mentioned above: “I do not understand why some people keep chalav Yisrael today. Do they really think that someone is adding pig’s milk?”

Indeed, even in the time of the Gemara, it was probably unheard of for anyone to add pig’s milk or, for that matter, for anyone to use pig’s milk, since sows are almost impossible to milk. Although most non-kosher species do not allow themselves to be milked (have you ever tried to milk a cat?), camels, donkeys, and mares can all be milked and produce a palatable product. As a matter of fact, at times there was a large (non-kosher) market for mare’s milk, because of its reputed health benefits. (See Encyclopedia Talmudis Volume 15 column 178-179.) Contemporarily, there is extensive research at Ben Gurion University about use of some antibodies found in camel’s milk for treatment of a host of autoimmune diseases. I have been asked many questions about use of this milk, which is clearly non-kosher, but is permitted in case of a life-threatening ailment. (The shaylos that result from this last case will need to be dealt with at a different time.)

To answer Shirley’s question succinctly: although we can assume that the milk on your supermarket shelf is unadulterated cow’s milk, the Chasam Sofer still rules that Chazal prohibited consuming this milk, and this prohibition is in full effect today, even when the reason for the takanah no longer applies. In addition, other rabbonim have voiced other concerns about the kashrus of unsupervised dairy cows.

Stricter than Ever?

At this point, let us examine the second question I mentioned above: “My friend quoted his rav that it is more important to keep chalav Yisrael today than it ever was before. How could this be?”

One obvious reason for this rav’s position is that he holds, as does the Chasam Sofer, that using non-chalav Yisrael incurs a Torah prohibition of violating vows. Furthermore, he may feel that since being lenient on this issue is so rampant, one must demonstrate the importance of this mitzvah. He may also be concerned about the displaced abomasums problem, and holds that this prohibits the milk min haTorah.

In Conclusion

Notwithstanding the fact that the Chazon Ish writes the reasons why unsupervised milk is permitted, he never allowed its use; and Rav Moshe similarly advocates being strict, and himself did not rely on the heter. Similarly, it is well known that Rav Eliezer Silver traveled across North America by train taking his own chalav Yisrael milk with him as he went. (I have no idea why it did not spoil en route.) In conclusion, we allow each reader to clarify with his own rav whether his or her circumstances permit relying on using non-chalav Yisrael milk.