The Quantitative Leucine Requirement of the Suckling Pig

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Abstract
Two experiments were conducted to study the L-leucine requirement of suckling pigs fed simulated “milk” diets containing sufficient nitrogen to be equivalent to 25% of the air-dry diet as protein. The dietary nitrogen was supplied by casein, amino acids and ammonium citrate (dibasic). Growth and feed efficiency were used as criteria in studying the effects of adding the various levels of L-leucine in both experiments. In addition, carcass storage of protein, fat and ash were determined for all pigs in the second experiment. The data indicate that the L-leucine requirement is more than 1.00%, but not more than 1.25% of the diet. This is equivalent to not more than 5.0% of the dietary protein.