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Veal can be raised on formula that contains basar bechalav (a meat and milk mixture) which is asur behana'ah (forbidden to derive benefit from). Would this isur cause the meat from animals exclusively raised from such a formula to be forbidden.
Note that I do not say not kosher but forbidden for other reasons. If this is the case, would using this formula as part of the feed make a difference or not?
If a non jew is feeding it there seems to be no difference if it was forbidden for pleasure, it is just seen as forbidden food.
But it is forbidden for a Jew to feed his animals from it.
Recording if the animal is kosher:
Ramo on yora Daya 60.1
בְּהֵמָה שֶׁנִּתְפַּטְּמָה בִּדְבָרִים אֲסוּרִים, מֻתֶּרֶת אֲבָל אִם לֹא נִתְפַּטְּמָה כָּל יָמֶיהָ רַק בִּדְבָרִים אֲסוּרִים, אֲסוּרָה
My translation
An animal which was fattened with forbidden things is permitted,
But if it was fattened for it's whole life only with forbidden things it is forbidden
It seems the aruch hashulchan 60 6-7 argues on this and says that
The it is only forbidden if it only ate things that are "forbbiden from pleasure" becouse of idle worship, but if it at things which are "forbbiden from pleasure" for other reason it is not forbbiden
There's a little-known halacha that an animal that has eaten nothing but non-kosher its entire life is itself non-kosher. (This is usually explained as a rabbinic prohibition because of how it looks.) One opinion in the Rishonim is this only had to do with animals brought as sacrifices (so irrelevant to our conversation); another is that it applies today, for any type of non-kosher animal feed; a third (which we apparently follow) is that the animal is rendered non-kosher only if its feed is so non-kosher that you can neither eat it nor derive benefit from it. See the Ramah and Shach on Yoreh Deah 60:1 (pdf).
אבל אם לא נתפטמה כל ימיה רק בדברים אסורים אסורה
But if it was fed exclusively its whole life only food prohibited from benefit, the animal is prohibited.
So if it's given this meat-and-milk formula as well as other things to eat, it would be permitted.
In the early 2000s the concern was raised that veal were being fed a formula that contained both meat and milk ingredients, cooked together. Rabbi JD Bleich's conclusion in a Tradition article (winter 2007) is that the way this meat-and-milk veal feed is made (among other factors) doesn't quite make it prohibited from benefit, only from eating, hence this problem would not apply; [the meat and milk in the formula weren't actually boiled directly together] however, he felt that if it took several paragraphs of nitty-gritty to explain why it's kosher, we shouldn't call it "glatt", which implies "it didn't take a great rabbi to figure out that this is kosher." There's also some discussion about whether they "finish" the animals with a few days of different feed, and again there's been talk whether they've redone the formula in general to something without meat or milk.
