Abstract
Two experiments were conducted to evaluate the relative efficiency of dl-methionine and methionine hydroxy analogue-calcium (MHAC) in broiler diets. A corn-soybean diet containing 21% protein and 6% added fat was utilized. It had been previously found that broilers would respond to supplemental levels of methionine up to 0.12% in this diet. In both experiments, seven pens of males and seven pens of females, each containing 17 birds were fed each experimental diet. This resulted in a total of 28 replicate pens receiving each diet. Five experimental diets were fed: basal, 0.04 and 0.08% supplemental dl-methionine, and 0.036 and 0.072% supplemental MHAC. Body weight and feed efficiency were measured at four weeks of age. The MHAC was found to have a 79.1% activity of dl-methionine on a weight gain basis, and 89.3% activity on a feed efficiency basis.
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