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| Goulart,C.C.; Costa,F.G.P.; Silva,J.H.V.; Souza,J.G.; Rodrigues,V.P.; Oliveira,C.F.S.. |
| The objective of this work was to estimate requirements of digestible methionine + cystine for broiler chickens from 1 to 42 days of age. It was carried out four experiments for each one of the following phases: pre-initial, initial, growing and final. The birds were distributed in a completely randomized experimental design, with six treatments and six replicates. Treatments consisted of a basal feed for each phase, deficient in digestible methionine + cystine and supplemented with DL-methionine to supply six levels of digestible methionine + cystine, resulting in different digestible methionine + cystine:digestible lysine ratios. In the pre-initial phase, levels of digestible methionine + cystine did not influence feed intake and feed conversion.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Digestible amino acids; Ideal protein; Sulfur amino acid. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000400013 |
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| Gomes,Paulo Cezar; Lima,Cristina Amorim Ribeiro de; Calderano,Arele Arlindo; Rostagno,Horacio Santiago; Albino,Luiz Fernando Teixeira. |
| 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... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Eggs; Requirement; Sulfur amino acid. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000500011 |
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