Effect of amino acid levels during broiler breeder pullet rearing on: 2. Egg weight and characteristics from 26 to 34 wk of age

Juarez Donzele Thanks for your comment. This is one of the four abstracts presented on this topic a year ago. The full papers have been submitted for publication. I would recommend you read all the information prior to making conclusions based on a 2,300 character abstract. I did not make this publication in Engormix. This is public material that Engormix found on the web based on material discussed in person during scientific meetings. The levels of all AA evaluated had the Cobb recommendations as standard (100%) and were either reduced 10 and 20% or increased 10% to estimate optimum Levels of All AA to use within the levels already tested commercially. Digestible Lys was only a guide for a balanced protein based on Cobb guidelines. These were levels of AA used worldwide and we tested under controlled conditions what are some of the effects of changing them as many nutritionists attempt to do for different purposes. We were not determining the AA requirements as you probably understood. It is well known that previous levels of AA and other nutrients affect future responses to nutrient levels in the subsequent phases. It is well known that nutrient requirements should be tested only phase by phase. But, for practical application, somebody has to test what is the final effect of combining those estimated levels in a feeding program. That was our job.