The use of animal derived feed is not permitted in Ruminantia feed to prevent the occurrence of mad cow disease. Cattle are Ruminantia, fish meal is animal feed. 

Because of a national ban on the use of animal derived feed in Ruminantia feed, fish meal packaging has been marked as prohibited. A ruminant is an animal that regurgitates food that has been partially digested in its stomach over a period of time, returning it to the mouth for chewing. 

RUMINANTIA. Usually some herbivores, because the plant fiber is more difficult to digest. Feeding cattle must be in accordance with the cattle’s growth stage and the role of feeding. Cattle feed can be divided into cow feed and beef cattle feed. As cattle are Ruminantia, there are some taboos in the feeding of feed, plus cattle feed is made according to the growth stage and function of cattle, it is recommended that  Good feed special cattle feed.