Research in the June Journal of Dairy Science seeks to better define the amino-acid requirements of pre-weaned calves. During four studies, researchers added essential amino acids to milk replacers to estimate the optimum level of lysine, methionine and threonine needed by calves less than five weeks of age. All of the milk replacers contained 17 percent fat. Only the crude protein and amino acid levels differed. All calves were offered calf starter.
Results from the studies suggest that calves benefit most from a milk replacer formulated to contain 26 percent crude protein, 2.34 percent lysine and 0.72 percent methionine. Feeding more than these levels did not improve daily gains or feed efficiency. For more, click here.