Effects of dietary threonine on growth performance and carcass traits of Yangzhou geese

S.R. Shi, Z.Y. Wang, J.M. Zou, H.M. Yang and N. Jiang
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S.R. Shi: College of Animal Science and Technology, Yangzhou University, Yangzhou, Jiangsu Province, P.R. China
Z.Y. Wang: College of Animal Science and Technology, Yangzhou University, Yangzhou, Jiangsu Province, P.R. China
J.M. Zou: Poultry Institute, Chinese Academy of Agricultural Sciences, Yangzhou, Jiangsu Province, P.R. China
H.M. Yang: College of Animal Science and Technology, Yangzhou University, Yangzhou, Jiangsu Province, P.R. China
N. Jiang: College of Animal Science and Technology, Yangzhou University, Yangzhou, Jiangsu Province, P.R. China

Czech Journal of Animal Science, 2010, vol. 55, issue 9, 382-387

Abstract: A dose-response experiment with 5 total dietary threonine (Thr) levels (0.54, 0.64, 0.74, 0.84 and 0.94%) was conducted to study the effect of dietary Thr on growth performance and carcass traits of Yangzhou geese from 0 to 8 weeks of age. Three hundred 1-day-old Yangzhou goslings were randomly allocated to 15 pens with 20 birds (10 males and 10 females) per pen according to similar pen weight. There were 5 dietary treatments, consisting of 3 replicate pens. Weight gain, feed intake and feed/gain of geese from each pen were measured at 2-week intervals from 0 to 8 weeks. At 56 days of age, four geese (2 males and 2 females) were selected randomly from each pen and slaughtered to evaluate the carcass quality. The results showed that an increase in dietary Thr resulted in an increase and then a decrease in daily weight gain in both periods. Peak daily weight gain responses appeared in geese fed the 0.74%Thr diet in both periods (36.120 and 61.96 g, respectively). Thr supplementation significantly affected feed/gain in the 0-4 week period (P ≤ 0.045) and daily feed intake in the 5-8 week period (P ≤ 0.012). No significant linear or quadratic responses from Thr supplementation were observed in growth performance and carcass traits of geese except for eviscerated carcass percentage (quadratic effect, P ≤ 0.016). The optimal Thr requirement of Yangzhou geese from 0 to 8 weeks of age was 0.726% for eviscerated carcass percentage. The results of our experiment reported herein would document that the Thr requirements suggested by NRC (1994) for geese up to 8 weeks of age are safe estimates; they may slightly overestimate the requirements but not by a large margin.

Keywords: threonine; geese; growth performance; carcass traits (search for similar items in EconPapers)
Date: 2010
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlcjs:v:55:y:2010:i:9:id:172-2009-cjas

DOI: 10.17221/172/2009-CJAS

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