Effect of dietary chelated copper and methionine and cysteine on performance, egg quality, and nutrient balance in brown laying hens from 20 to 49 wk old

Autor(es)

Trindade Neto, M. A. ^[1] ; Saccomani, A. P. O. ^[2] ; Tse, M. L. P. ^[3] ; Dadalt, J. C. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Anim Nutr & Prod, BR-19635900 Pirassununga, SP - Brazil

^[2] Univ Sao Paulo, FZEA, Dept Anim Sci, BR-13635900 Pirassununga, SP - Brazil

^[3] UNESP, Dept Anim Sci, BR-18618970 Botucatu, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: CANADIAN JOURNAL OF ANIMAL SCIENCE; v. 99, n. 2, p. 283-295, JUN 2019.
• Citações Web of Science: 0

Resumo

Using 960 brown laying hens from 20 to 48 wk of age, in a 4 x 5 factorial arrangement, the effects on production, quality of eggs, and nutrient balance of analysed 18, 41, 61, and 111 mg kg(-1) of copper (Cu) and of 0.550%, 0.679%, 0.793%, 0.845%, and 0.948% of methionine and cysteine (Met + Cys) were evaluated. Treatments were administered to six replicate cages (eight hens per cage). At the 49th wk of age, 320 of these hens were kept under the same experimental conditions to evaluate the nutrient balance, and each treatment was allocated to four replicate cages (four hens per cage). The trend of interaction effect between Cu and Met + Cys levels was observed on egg weight and mass. The interaction between mineral and amino acid was characterized on egg quality variables. Quadratic equations indicated that increasing the dietary level of Cu reduced the estimate requirement of Met + Cys for hens. Across the entire experimental period, the total estimated Met + Cys level was 0.755% +/- 0.021% based on the performance variables. As Cu increased in the diet, it decreased the estimated Met + Cys level to ensure egg weight, mass, and egg quality. Level of chelated Cu above 23 mg kg(-1) may negatively affect the egg quality. (AU)

• Processo FAPESP: 11/02463-2 - Cobre e zinco associados à metionina e treonina em dietas de galinhas poedeiras: desempenho, qualidade dos ovos, colesterol sérico, colesterol nos ovos, balanço de nitrogênio, retenção de cobre e zinco
• Beneficiário: Messias Alves da Trindade Neto
• Modalidade de apoio: Auxílio à Pesquisa - Regular