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The effect of dietary methionine levels on endogenous nitrogen and endogenous amino acids flows in growing goats.
Zhou, C S; Tan, Z L; Tang, S X; Sun, Z H; Han, X F; Wang, M; Tayo, G O.
Afiliação
  • Zhou CS; Key Laboratory of Agro-ecological Process of Subtropical Region, Institute of Subtropical Agriculture, the Chinese Academy of Sciences, Changsha, Hunan, China.
J Anim Physiol Anim Nutr (Berl) ; 94(5): 594-604, 2010 Oct.
Article em En | MEDLINE | ID: mdl-19906133
The effect of dietary methionine (Met) levels on endogenous N and amino acids (AA) flows at different part of the digestive tract of growing goats was determined using a (15)N isotope dilution technique. Three goats (25 ± 2.5 kg) were fitted with the ruminal, duodenal and ileal cannulae and allocated to three dietary treatments in a 3 × 3 Latin square design. The dietary treatments consisted of a total mixed ration containing three levels of Met (0.15%, 0.25% and 0.35%) respectively. It was found that at 0.15% Met level, the lowest flow in endogenous N and total AA at the duodenum and ileum occurred. The endogenous N secretion contributed to 26% and 23% of the duodenal and ileal total N flows, respectively, and the proportions were not affected by the dietary Met levels. The duodenal and ileal flows of endogenous total AA were 11.1, 11.8, 11.3 g/d and 2.9, 3.9, 4.1 g/d respectively. The average real digestibility of N was 65%, 87% and 95% in the forestomach, intestine and whole digestive tract respectively.
Assuntos

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Cabras / Dieta / Aminoácidos / Metionina / Nitrogênio Limite: Animals Idioma: En Ano de publicação: 2010 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Cabras / Dieta / Aminoácidos / Metionina / Nitrogênio Limite: Animals Idioma: En Ano de publicação: 2010 Tipo de documento: Article