Digestible Lysine Requirement of Liuzhou Mahua Broilers at Different Growth Stages

Gang Jia, Ying Wang, Qiuhong Deng, Kangning Wang and Xiongxian Guo

Journal of Agricultural Science, 2010, vol. 2, issue 3, 211

Abstract: Experiments were conducted to determine the digestible lysine (DLys) requirement of Liuzhou Mahua broilersfrom 1 to 21 d and from 22 to 42 d of age. Monofactorial design was adopted in this study. 1200 one-day-oldhealthy broiler chicks were divided randomly and evenly into five treatments, and were all fed with isoenergeticdiet (with ME of 3.0 Mcal/kg) but with graded levels of DLys- 1.22%, 1.12%, 1.02%, 0.91% and 0.81% duringthe period of 1 to 21 days; 1.13%, 1.02%, 0.92%, 0.82% and 0.71% during the period of 22 to 42 days. Theresults showed that the DLys level in diet had a quadratic relationship both with the average daily gain (ADG)and feed-gain ratio (F/G). For Liuzhou Mahua broilers from 1 to 21 d of age, ADG was the highest at the DLyslevel of 1.12%, which was not significantly different from those at the levels of 1.22% and 1.02% (P>0.05), andF/G was the lowest at the DLys level of 1.22%. For Liuzhou Mahua broilers from 22 to 42 d of age, at the DLyslevel of 1.02%, ADG was the highest, and F/G was the lowest, but not significantly different from those at thelevels of 1.13% and 0.92% (P>0.05). According to regression analysis results, for Liuzhou Mahua broilers from1 to 21 d of age, the optimum DLys requirement was 1.07% with ADG as the indicator, and was 1.13% with F/Gas the indicator. For Liuzhou Mahua broilers from 22 to 42 d of age, with ADG and F/G as the indicator, DLysrequirement were 0.89% and 0.84%, respectively. Liuzhou Mahua broilers were not as sensitive to DLysconcentration variation as fast-growing broilers from abroad.

Date: 2010
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