Digestible Lysine Requirement of Liuzhou Mahua Broilers at Different Growth Stages

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

Abstract


Experiments were conducted to determine the digestible lysine (DLys) requirement of Liuzhou Mahua broilers
from 1 to 21 d and from 22 to 42 d of age. Monofactorial design was adopted in this study. 1200 one-day-old
healthy broiler chicks were divided randomly and evenly into five treatments, and were all fed with isoenergetic
diet (with ME of 3.0 Mcal/kg) but with graded levels of DLys: 1.22%, 1.12%, 1.02%, 0.91% and 0.81% during
the 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. The
results 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 DLys
level of 1.12%, which was not significantly different from those at the levels of 1.22% and 1.02% (P>0.05), and
F/G was the lowest at the DLys level of 1.22%. For Liuzhou Mahua broilers from 22 to 42 d of age, at the DLys
level of 1.02%, ADG was the highest, and F/G was the lowest, but not significantly different from those at the
levels of 1.13% and 0.92% (P>0.05). According to regression analysis results, for Liuzhou Mahua broilers from
1 to 21 d of age, the optimum DLys requirement was 1.07% with ADG as the indicator, and was 1.13% with F/G
as the indicator. For Liuzhou Mahua broilers from 22 to 42 d of age, with ADG and F/G as the indicator, DLys
requirement were 0.89% and 0.84%, respectively. Liuzhou Mahua broilers were not as sensitive to DLys
concentration variation as fast-growing broilers from abroad.

Full Text: PDF DOI: 10.5539/jas.v2n3p211

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Journal of Agricultural Science ISSN 1916-9752 (Print) ISSN 1916-9760 (Online)

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