Methionine sources do not affect performance and carcass yield of broilers fed vegetable diets and submitted to cyclic heat stress
Título del documento: Methionine sources do not affect performance and carcass yield of broilers fed vegetable diets and submitted to cyclic heat stress
Revista: Revista brasileira de ciencia avicola
Base de datos: PERIÓDICA
Número de sistema: 000279315
ISSN: 1516-635X
Autors: 1
Institucions: 1Universidade Federal do Rio Grande do Sul, Departamento de Zootecnia, Porto Alegre, Rio Grande do Sul. Brasil
Any:
Període: Jul-Sep
Volum: 7
Número: 3
Paginació: 159-164
País: Brasil
Idioma: Inglés
Tipo de documento: Nota breve o noticia
Enfoque: Experimental
Resumen en inglés The supplementation of vegetal diets with L-methionine (100% molar), methionine hydroxyl analogue (HMB) (88% molar) or DL-methionine (99% molar) was compared as to the performance of broilers allocated in cages and submitted to cyclic heat stress (CHS). The trial was carried out from 21 to 42 days of age. Two levels of synthetic methionine were supplemented for each methionine source (0.1 or 0.3 %), and the control treatment was not supplemented with synthetic methionine (negative control). Statistical analyses included the negative control treatment or were performed in a 3 x 2 factorial design (sources x levels). Addition of synthetic methionine to the basal level containing 0.63 % of total sulphur amino acids significantly improved feed conversion (FC) independent of the source. On the other hand, improvements in weight gain (WG) and body weight (BW) were more consistent comparing the negative control to HMB-supplemented treatments. Factorial analysis showed better FC for L-Met compared to DL-Met, whereas HMB showed intermediate results. The supplementation level of 0.3% methionine showed better FC than 0.1%. Methionine levels or sources had no effects on carcass, yields of cuts or feathering results. Therefore, results of DL-Met and HMB added to vegetal-based diets in comparable molar terms promoted similar performance in broilers under CHS conditions
Disciplines Medicina veterinaria y zootecnia
Paraules clau: Aves de corral,
Zootecnia,
Pollos de engorda,
Dietas,
Hortalizas,
Estrés calórico,
Rendimiento
Keyword: Veterinary medicine and animal husbandry,
Animal husbandry,
Poultry,
Broilers,
Diets,
Vegetables,
Heat stress,
Yield
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