Níveis de metionina+cistina digestível em rações para poedeiras leves no período de 24 a 40 semanas de idade

Abstract

RESUMO -Objetivou-se determinar os níveis de aminoácidos sulfurosos digestíveis para se estabelecer a relação ideal metionina+cistina:lisina em rações para poedeiras leves no período de 24 a 40 semanas de idade. Utilizaram-se 216 aves Hy-Line W36 em delineamento de blocos casualizados com seis níveis, cada um com seis repetições de seis aves por unidade experimental. Os níveis de aminoácidos sulfurosos digestíveis foram obtidos a partir de uma dieta basal com baixo nível de metionina+cistina digestível (0,65%) e suplementada com 0,00; 0,05; 0,10; 0,15; 0,20 e 0,25% de DL-metionina 99,2%, de forma a apresentar relações metionina + cistina:lisina de 84, 91, 97, 104, 110 e 117%. O período experimental teve duração de 16 semanas e foi subdividido em quatro subperíodos de coleta dos ovos, cada um com 28 dias de duração. Os níveis de metionina+cistina digestível influenciaram a produção de ovos e a eficiência de utilização de lisina por produção total de ovos, atingindo um platô em 0,811 e em 0,772% de metionina+cistina digestível, respectivamente. O nível de metionina+cistina digestível considerado exigência para poedeiras leves no período de 24 a 40 semanas de idade é de 0,772%, que corresponde a consumo de 682 mg/ave/dia de metionina+cistina digestível e a relação metionina+cistina:lisina de 100%. Palavras-chave: aminoácidos sulfurados, exigências nutricionais, proteína idealDigestible methionine + cystine level in meals for light-weight laying hens from 24 to 40 weeks of age ABSTRACT -The objective of this work was to determine digestible sulfurous amino acids levels to establish the ideal methionine+cystine:lysine relationships in meals of light-weight laying hens in the period from 24 to 40 weeks of age. It was used 216 Hy-Line W36 birds distributed in a randomized block design with 6 levels each one with 6 repetitions and 6 birds per experimental unit. The digestible sulfurous amino acids levels were obtained from a basal diet with low levels of digestible metionin+cistine (0.65%) supplemented with 0.00; 0.05; 0.10; 0.15; 0.20 and 0.25% of DL-methionine (99.2%) to provide a relationship methionine+cystine:lysine of 84, 91, 97, 104, 110 and 117%. The experimental period lasted 16 weeks and it was subdivided in 4 subperiods of collection of the eggs, each one corresponding to 28 days. Levels of digestible methionine+cistine affected egg production and lysine utilization efficiency per total egg production, reaching a plateau in 0.811 and 0.772% of digestible methionine+cistine, respectively. The digestible methionine+cystine level considered as a requirement for light-weight laying hens in the period from 24 to 40 weeks of age is of 0.772%, corresponding to digestible methionine+cystine consumption of 682 mg/hen/day, and the relationship methionine+cystine:lysine of 100%.Key Words: ideal protein, nutritional requirements, sulfur amino acid IntroduçãoAtualmente tem sido importante otimizar a utilização dos alimentos na dieta das aves, principalmente os componentes proteicos, por possuírem os mais elevados custos, ...

Standardized ileal digestible lysine requirement of white commercial layers in peak egg production

“…Basal diet was formulated based on corn and soybean meal to contain 149.58 g CP/kg diet and 2,900 kcal AMEn/kg diet). Ideal digestible ratios of Met + Cys, Thr, Trp, Val, Arg, Ile and Phe + Tyr relative to SID Lys were 103,81,28,96,103,80, and 121%, which corresponded to 3.0 perceptual point above the ratios recommended by Brumano et al (2010), Rocha et al (2013a), Calderano et al (2012), Rostagno et al (2011), Bregendahl et al (2008, Rocha et al (2013b) and Rostagno et al (2011), respectively. Throughout the study, hens were provided mash feed and water ad libitum.…”

“…This increase in egg weight could be related to the higher crystalline amino acid concentration in diets with higher SID Lys content, since essential amino acid supply was concomitantly increased with SID Lys. Once added to diets, essential amino acids like lysine, methionine and tryptophan lead to an increase in egg weight by improving yolk weight and albumen weight (TRINDADE NETO et al, 2011;BRUMANO et al, 2010;CALDERANO et al, 2012).…”

Digestible lysine levels in diets for laying Japanese quails

“…Taking only the extreme digestible lysine levels analyzed (9.50 and 12.00 g digestible lysine/kg of diet), the intake of one gram digestible lysine resulted in respective production of 42.0 and 34.6 g egg mass. Brumano (2008), who worked with white-egg-laying hens in the period from 42 to 58 weeks of age, observed quadratic effect of the digestible methionine + cistine to lysine utilization efficiency on total egg production.…”

“…The advancements in the knowledge of the nutritional requirements of birds, at their many phases, has constantly brought improvement to the quality of the diet; firstly in the sense of reaching maximum production, followed by the search for the lowest price of the feed and for the conversion of these animals into egg numbers (Ceccantini & Yuri, 2008).Thus, the great knowledge of the metabolism of protein in birds and the production of amino acids on a commercial basis have enabled the utilization of the concept of ideal protein at the formulation of diets.…”

Digestible tryptophan:digestible lysine ratio in diets for laying hens from 24 to 40 weeks of age

“…The minimum ratio between the essential amino acids and lysine met in the diets were: methionine + cystine, 1.030 (1.00 recommended by Brumano (2008) The increase of 0.030 in the ratios was aimed at preventing the lack of some essential amino acid, because if any of the ratios were underestimated, the performance of the birds could be limited, compromising optimal determination of the ideal digestible tryptophan:digestible lysine ratio. The other nutrients and energy, except for crude protein, followed the recommendations by Rostagno et al (2005).…”