Molecular Nutrition

Dietary Lysine Requirement for Jinghong Hens from 5 to 8 Weeks of Age

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  • National Engineering Research Center of Biological Feed, Key Laboratory of Feed Biotechnology of Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China

Received date: 2016-09-28

  Online published: 2017-04-14

Abstract

The aim of this study was to determine the dietary lysine (Lys) optimal requirement for Jinghong laying hens from 5 to 8 weeks of age. Three hundred and sixty Jinghong hens at the end of 4-week-old were randomly allotted to 5 groups with 6 replicates of 12 birds each. The dietary Lys levels were 0.70%, 0.84%, 0.98%, 1.12% and 1.26%, respectively. The experiment lasted for 4 weeks. The results showed that, the average daily gain, body weight at 8 weeks of age and community evenness of hens in 0.84% Lys group were significantly higher than those in 1.26% Lys group (P<0.05). Birds fed 0.98% and 1.12% Lys diets had significantly higher body development, relative to those receiving 1.26% Lys diet (P<0.05). The duodenum weight and jejunum length in both 0.98% and 1.12% Lys groups were significantly higher than those in 0.70% and 1.26% Lys groups (P<0.05). The thymus index in 0.84% Lys group was significantly higher than that in 0.98%, 1.12% and 1.26% Lys groups (P<0.05). The bursa of Fabricious index in 0.84%, 0.98% and 1.12% Lys groups was higher than that in the other groups (P<0.05). The serum contents of total protein and albumin in 0.84%, 0.98% and 1.12% groups were significantly higher than those in 0.70% and 1.26% Lys groups (P<0.05). Compared to those receiving 1.26% Lys diet, hens fed 0.98% Lys diet had significantly lower serum contents of uric nitrogen and uric acid (P<0.05). The serum alkaline phosphatase activity and plasma growth hormone content in 0.84% Lys group were significantly higher than those in 0.70% Lys group (P<0.05). According to the quadratic regression analysis for final body weight, community evenness, eviscerated carcass weight, carcass weight, heart index, liver index, tibial length, duodenum weight and serum uric acid content, the optimal dietary levels of Lys for Jinghong hens were 0.906%, 0.888%, 0.931%, 0.928%, 0.889%, 0.902%, 0.902%, 1.071% and 0.958%, respectively. In conclusion, the dietary optimum level of Lys for Jinghong laying hens of 5 to 8 weeks of age is 0.93%.

Cite this article

WANG Xiaocui, WU Shugeng, SONG Dan, ZHANG Haijun, YUE Hongyuan, WANG Jing, QI Guanghai . Dietary Lysine Requirement for Jinghong Hens from 5 to 8 Weeks of Age[J]. Chinese Journal of Animal Nutrition, 2017 , 29(4) : 1124 -1131 . DOI: 10.3969/j.issn.1006-267x.2017.04.006

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