Digestible methionine + cysteine: lysine ratios for growing meat-type quails

Author:

Castro Mariana Resende de1,Pinheiro Sandra Regina Freitas1ORCID,Miranda Jéssica Amaral1,Costa Leonardo da Silva1ORCID,Rocha Graziela Maria de Freitas1,Oliveira Renata Gomes de2,Martins Paulo Gustavo Macedo de Almeida3ORCID

Affiliation:

1. Universidade Federal dos Vales do Jequitinhonha e Mucuri, Brazil

2. Universidade Federal de Minas Gerais, Brazil

3. Instituto Federal do Norte de Minas Gerais, Brasil

Abstract

ABSTRACT: The objective was to estimate the most appropriate digestible methionine + cysteine:lysine ratios for growing meat-type quails (Coturnix coturnix) from 1 to 21 days of age. Quails were fed with a basal ration deficient in digestible methionine + cysteine, with five levels of DL-methionine, in substitution of glutamic acid and starch, resulting in digestible methionine + cysteine:lysine ratios of 0.61, 0.66, 0.71, 0.76 and 0.81. Feed and methionine + cysteine intake, body weight gain, feed conversion and uniformity were assessed. From 1 to 7 days, an increasing linear effect was observed for feed and methionine + cysteine intake, body weight gain, and uniformity, and a linear decrease for feed conversion. From 8 to 14 days, the 0.70 methionine + cysteine: lysine ratio was the best for feed intake and body weight gain, and for uniformity, the 0.75 methionine + cysteine:lysine ratio was the most appropriate. For methionine + cysteine intake and feed conversion, an increasing and decreasing linear adjustment was observed, respectively. From 15 to 21 days, an increasing linear effect was observed for feed and methionine + cysteine intake and body weight gain; a decreasing linear effect was observed for feed conversion. The 0.81 ratio was the most efficient for feed conversion during all evaluated experimental periods. In conclusion, the 0.81 dietary methionine + cysteine:lysine ratio is the most appropriate for meat-type quails during the first 21 days of age.

Publisher

FapUNIFESP (SciELO)

Subject

General Veterinary,Agronomy and Crop Science,Animal Science and Zoology

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