Effect of dietary levels of methionine + cystine on performance of broiler breeders

Abstract

-The objective of this experiment was to evaluate levels of methionine + cystine levels for broiler breeders from 40 to 60 weeks of age. It was used 288 Cobb broiler breeders, distributed in a randomized experimental design with six levels of methionine+ cystine in the diets (0.39; 0.47; 0.55; 0.63; 0.71 and 0.79%), eight repetitions and six breeders per experimental unit. The diets were isocaloric and isoprotein (2,850 kcal ME/kg and 12.58% CP) and oferred at a fixed amount (155 g) per bird. For the entire studied period, by using polynomial analysis, it was observed a quadratic effect of methionine + cystine levels on the percentage of egg production, on number of eggs per hen housed, on number of eggs per hen and egg weight. There was also a linear effect on shell weight when it was calculated in relation to egg weight. The total methionine + cystine requirement for broiler breeders was calculated at 0.521% for percentage of egg production and number of eggs per hen, which corresponds to a daily intake of 808 mg of methionine + cystine/day. The digestible methionine + cystine requirement for broiler breeders was estimated at 727 mg for laying percentage and number of eggs per hen.Key Words: eggs, requirement, sulfur amino acid Efeito dos níveis dietéticos de metionina + cistina no desempenho de matrizes pesadasRESUMO -Com o objetivo de avaliar níveis de metionina + cistina para matrizes pesadas de 40 a 60 semanas de idade, conduziu-se um experimento com 288 matrizes da linhagem Cobb-500, distribuídas em delineamento inteiramente casualizado, com seis níveis de metionina + cistina nas dietas (0,39; 0,47; 0,55; 0,63; 0,71 e 0,79%), oito repetições e seis matrizes por unidade experimental. As rações foram isocalóricas e isoproteicas (2.850 kcal EM/kg e 12,58% PB) e fornecidas em quantidade fixa (155 g) por ave. No período total estudado, por meio de análise polinomial, foi observado efeito quadrático dos níveis de metionina + cistina sobre o percentual de produção de ovos, o número de ovos por ave alojada, o número de ovos por ave e o peso dos ovos. Houve também efeito linear sobre o peso da casca quando calculado em relação ao peso dos ovos. A exigência de metionina + cistina total para matrizes pesadas foi estimada em 0,521% para percentual de produção de ovos e número de ovos por ave, o que corresponde a uma ingestão diária de 808 mg de metionina + cistina total. A exigência de metionina + cistina digestível para matrizes pesadas é de 727 mg para percentual de postura e número de ovos por ave.Palavras-chave: aminoácidos sulfurosos, exigência, ovos Revista Brasileira de Zootecnia

Dietary methionine source and level affect hepatic sulfur amino acid metabolism of broiler breeder hens

“…; Bowmaker & Gous ; Harms & Russell ; Gomes et al . ). A range of methionine requirements from 321 (Bowmaker & Gous ) to 570 mg/hen/day (Bornstein et al .…”

“…Methionine is usually the first limiting amino acid for laying hens and supplementation of DLM or HMTBA as methionine source is important to optimize the performance and health of layers. Effects of dietary methionine supplementation level on performance of broiler breeders has been documented by several studies (Bornstein et al 1979;Bowmaker & Gous 1991;Harms & Russell 1998;Gomes et al 2011). A range of methionine requirements from 321 (Bowmaker & Gous 1991) to 570 mg/hen/day (Bornstein et al 1979) for broiler breeders has been reported.…”

Optimal in‐feed amino acid ratio for broiler breeder hens based on deletion studies

“…Apart from Lys, methionine+cystine also have an important role in the synthesis of egg and body protein (Gomes et al., ). At the peak production, it is possible to observe a great mobilization of body protein content to supply Met+Cys in the synthesis of protein for egg mass production, which contributes for 29% of the total NR.…”

The Effect of Adding Aspartic Acid in Drinking Water on the Productive Performance and the Percentage of Carcasses to Meat in Broiler-Type Ross 308

“…Several experiments have been performed to determine the requirement of amino acids and the optimum dose for birds, Therefore, some changes must be considered, including the environment, body size, Feed Consumption, eggs Production, genotypes, and age. Through these changes, the birds' needs are assessed of amino acids (Fakhraei et al, 2010;Gomes et al, 2011;Ekmay et al, 2013). Jian et al, 2004 showed the increase of using the artificial amino acids in poultry feed has led to a gradual decrease in the level of protein consumption in broiler diets, as there are many studies concerned with using a low-protein diet to reduce the cost of feed and this leads to a decrease Essential amino acids (Kidd and Kerr, 1999) the safety acidosis plays an essential role in the maintenance of mucosa and cells (Mao et al, 2011).…”