Journal of Nutrition & Food Sciences
Open Access
ISSN: 2155-9600
ISSN: 2155-9600
Ideal in-feed amino acid ratio for laying hens
Nilva Kazue Sakomura, Letícia Soares, Juliano César de Paula Dorigam, Bruno Balbino Leme, Felipe de Lima Junqueira Franco Fabbri, Mariana Quintino do Nascimento and Warley Junior Alves
Paulista State University, Brazil
Scientific Tracks Abstracts: J Nutr Food Sci
The research was conducted to re-evaluate the assumptions of Ideal Ratios (IAAR) of the essential amino acids for Hy-line W-36 laying hens, using the amino acid deletion and nitrogen balance methods. The nitrogen balance trial was performed from 28 to 32 weeks of age, 12 treatments with 8 replicates and 1 bird per cage were used. A Balanced Diet (BD) was formulated to meet the IAAR and the requirement of other nutrients. The limiting diets were formulated diluting BD with corn starch and refilled with synthetic Amino Acids (AA) and other feed ingredients, except for the AA studied. The trial lasted 25 days, being the first 5 days for adaptation and the other 20 days for total collection of excreta and eggs. Diets, excreta and eggs samples were analyzed for nitrogen content to quantify nitrogen intake and excretion. From these data, nitrogen retention (NR) was calculated. The estimated requirement of each AA (AAR) was calculated as AAR=100 x (1-NRi/NRcontrol) where NRi is the NR associated with each limiting diet calculated and NRcontrol is the NR associated with the balanced control diet. The estimated optimum ratio between each AA and Lys [(AA/Lys) * 100] and the optimum level of each AA (values in parentheses) were: Lys=100 (0.673), Met+Cys=82 (0.552), Thr=69 (0.464), Trp=21 (0.141), Arg=104 (0.700), Val=91 (0.612), Ile=78 (0.525), Leu=121 (0.814), Phe+Tyr=119 (0.801), Gly+Ser=77 (0.518) and His=29 (0.195).
Nilva Kazue Sakomura has completed her PhD at Federal University of Viçosa and Postdoctoral studies at University of Arkansas, USA and University of KwaZuluNatal, South Africa. She is the Professor at the Paulista State University, FCAV/UNESP and coordinates the Laboratory of Avian Sciences at same university. Her research area is mainly focused on modeling amino acid requirements of broilers, laying hens and broiler breeders.
Email:sakomura@fcav.unesp.br