The effect of dietary methionine levels on endogenous nitrogen and endogenous amino acids flows in growing goats

The effect of dietary methionine levels on endogenous nitrogen and endogenous amino acids flows in growing goats

Author by Prof. Grace 'toyin Tayo

Journal/Publisher: Journal Of Animal Physiology And Nutrition

Volume/Edition: 94

Language: English

Pages: 594 - 604

Abstract

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 15N 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.


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