Microbiology: A Human Perspective 7th Edition by Eugene Nester,Martha Nester,Denise Anderson, Evans Roberts

تمرين 1

Many dairy operations keep cow's milk for sale and use formula and feed to raise any calves. One farmer noticed that calves raised on the formula and feed needed to be treated for diarrhea more fre­quently than calves left with their mothers to nurse. He had some tests run on the diets and discovered no differences in the calories or nutritional content. The farmer called a veterinarian and asked him to explain the observations. What was the vet's response?