Reevaluation Of Amino Acids Requirements For Layin

小馬哥

內(nèi)容介紹：PUBLICATION DATE: 15/02/2008 RATING AUTHOR: Philippe JOLY - ISA-Hendrix Genetics France The results of 15 experiments realized from 1990 have been used to define more precisely the requirement in Methionine and Sulfur Amino Acids. Results show that the daily requirement for Methionine is related to the bird productivity. If the requirement is expressed in mg per gram of egg mass produced, the requirement appeared independent of the daily egg mass produced. From this analysis, we conclude that the Methionine requirement is not related to the Cystine level. The Methionine requirement is estimated to 7.56 mg in total or 7.11mg in digestible per gram of egg mass produced. The requirement in Sulfur Amino Acids depends mainly of the Cystine level. Excess of Cystine increases the requirement in SAA. Without knowledge of a minimum requirement for the Cystine, we suggest to retain a requirement fixed at 12.10mg in total Sulfur Amino Acids or 10,90mg in digestible Sulfur Amino Acids per gram of egg mass produced.

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