Optimal in-feed amino acid ratio for laying hens based on deletion method

Author(s)

Soares, Leticia ^[1] ; Sakomura, Nilva Kazue ^[1] ; Dorigam, Juliano Cesar de Paula ^[2] ; Liebert, Frank ^[3] ; Sunder, Angela ^[3] ; do Nascimento, Mariana Quintino ^[1] ; Leme, Bruno Balbino ^[1]

Affiliation

^[1] Univ Estadual Paulista, Fac Ciencias Agr & Vet, Dept Anim Sci, Sao Paulo - Brazil

^[2] Evonik Ind, Dept Anim Nutr Res, Hanau - Germany

^[3] Univ Gottingen, Anim Nutr, Gottingen - Germany

• Document type: Journal article
• Source: JOURNAL OF ANIMAL PHYSIOLOGY AND ANIMAL NUTRITION; v. 103, n. 1, p. 170-181, JAN 2019.
• Web of Science Citations: 0

Abstract

A total of 56 Hy-line W-36 hens from 28 to 30 weeks were used on nitrogen balance (NB) trial to estimate daily N maintenance requirements (NMR) and the genetic potential for daily N retention (NRmaxT). The treatments consisted of six graded levels of nitrogen in the diets (N1 = 8; N2 = 16; N3 = 24; N4 = 32; N5 = 40; and N6 = 48 g N/kg of feed), formulated using the dilution technique. The regression analyses between nitrogen intake and excretion were performed to fit the exponential function and to determine the NMR = 292 mg/BWkg0.67, which was applied for further calculation of NRmaxT = 1,883 mg/BWkg0.67. A second NB trial was conducted, and a total of 96 Hy-line W-36 hens were used in the same period to estimate the ideal amino acid ratio (IAAR). Twelve treatments with eight replicates and one bird per cage were used. A balanced diet (BD) was formulated to meet the IAAR and the requirement of other nutrients for pullets. The limiting diets were formulated diluting BD with cornstarch and refilled with synthetic AAs and other feed ingredients, except for the AA under study. In each trial, the data of nitrogen intake, excretion, deposition and retention were obtained in a NB trial. The IAAR determined by Goettingen approach was Lys 100, Met+Cys 88, Trp 21, Thr 69, Arg 109, Val 90, Ile 75, Leu 127, Phe+Tir 110, Gly+Ser 73 and His 29%. The IAAR determined by Louvain approach was Lys 100, Met+Cys 88, Trp 21, Thr 69, Arg 104, Val 91, Ile 78, Leu 121, Phe+Tir 119, Gly+Ser 77 and His 29%. (AU)

• FAPESP's process: 13/25761-4 - Modeling production and nutritional requirements of poultry and fish
• Grantee: Nilva Kazue Sakomura
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 16/00536-6 - Determination of the ideal essential amino acid ratio for laying hens by deletion method
• Grantee: Letícia Soares
• Support Opportunities: Scholarships in Brazil - Doctorate