caa a22 4500 397542488 CHVBK 20180308164730.0 cr unu---uuuuu 161202s1995 xx s 000 0 eng 10.1093/japr/4.3.283 doi (NATIONALLICENCE)oxford-10.1093/japr/4.3.283 Methionine and Total Sulfur Amino Acid Requirements Influenced by Stage of Production [Elektronische Daten] [P. W. Waldroup, H. M. Hellwig] Nine consecutive flocks of SCWL pullets were started at 13-wk intervals and housed in individual laying cages. Beginning with the fourth flock, four different age groups of hens from the same genetic line were housed in the same environment and fed the same experimental diets to test the hypothesis that the methionine and total sulfur amino acid (TSAA) requirements of hens vary with age and stage of production. For the last eight weeks of each 13-wk period, estimates were made of methionine and TSAA requirements for maximum egg production, egg weight, and egg mass. Results indicate that the methionine and TSAA requirements do not diminish with age and stage of production. Requirements were greater for the middle and final quarters of production than for the initial quarter. Peak daily requirements for methionine were 384, 380, and 402 mg/day for egg production, egg weight, and egg mass, respectively. These results indicate that the application of a phase feeding program based upon a reduction in protein or amino acid requirement as hens age has no scientific basis. Adjustments should be made in dietary amino acid levels to compensate for changes in daily feed intake as influenced by environmental changes, feather covering, or other factors in order to maintain a constant amino acid intake, but adjustment based on age or stage of production is not justified. © 1995 Applied Poultry Science, Inc. Laying hen nationallicence methionine nationallicence phase feeding nationallicence requirement nationallicence sulfur amino acids nationallicence Waldroup P. W. Poultry Science Department, University of Arkansas, Fayetteville, AR 72701; Phone: (501) 575-2065; FAX: (501) 575-3474 aut Hellwig H. M. Poultry Science Department, University of Arkansas, Fayetteville, AR 72701; Phone: (501) 575-2065; FAX: (501) 575-3474 aut Journal of Applied Poultry Research Oxford University Press 4/3(1995), 283-292 1056-6171 4:3<283 1995 4 japr https://doi.org/10.1093/japr/4.3.283 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1093/japr/4.3.283 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Waldroup P. W. Poultry Science Department, University of Arkansas, Fayetteville, AR 72701; Phone: (501) 575-2065; FAX: (501) 575-3474 aut NATIONALLICENCE 700 1- Hellwig H. M. Poultry Science Department, University of Arkansas, Fayetteville, AR 72701; Phone: (501) 575-2065; FAX: (501) 575-3474 aut NATIONALLICENCE 773 0- Journal of Applied Poultry Research Oxford University Press 4/3(1995), 283-292 1056-6171 4:3<283 1995 4 japr Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford