Effects of Dietary Lysine Level on Performance, Egg Quality and Serum Biochemical and Hormonal Indices of Linwu Ducks Aged from 22 to 28 Weeks

LIN Qian, ZHANG Xu, JIANG Guitao, DAI Qiuzhong

doi:10.3969/j.issn.1006-267x.2014.08.011

2014 , Vol. 26 >Issue 8: 2101 - 2109

DOI: https://doi.org/10.3969/j.issn.1006-267x.2014.08.011

Poultry Nutrition

Effects of Dietary Lysine Level on Performance, Egg Quality and Serum Biochemical and Hormonal Indices of Linwu Ducks Aged from 22 to 28 Weeks

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1. College of Animal Science and Technology, Hunan Agricultural University, Changsha 410128, China;
2. Department of Animal Nutrition and Feeding Technology, Hunan Institute of Animal Science and Veterinary Medicine, Changsha 410131, China

Received date: 2014-03-06

Online published: 2014-08-13

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Abstract

This experiment was conducted to study the effects of dietary lysine (Lys) level on performance, egg quality and serum biochemical and hormonal indices of Linwu ducks aged from 22 to 28 weeks, and to find the Lys requirement of Linwu ducks in early laying period. A total of 125 healthy 147-day-old Linwu duck with the nearly same body weight and laying rate were randomly selected and divided into 5 groups (dietary Lys level were 0.65%, 0.75%, 0.85%, 0.95% and 1.05%, respectively) with 5 replicates in each group and 5 ducks in each replicate. There was a 7 days adaptation period and a 42 days experimental period. The results showed as follows: 1) dietary Lys level had no significant effects on performance of laying ducks (P>0.05), but 0.95% Lys group obtained the best performance except average egg weight. 2) Dietary Lys level had no significant effects on egg shell thickness, albumen height, Haugh unit, yolk ratio, albumen ratio of laying ducks (P>0.05). The yolk color in 0.75% Lys group was significantly higher than that in 0.65% and 0.95% Lys groups (P<0.05), the egg shape index in 1.05% Lys group was significantly higher than that in 0.85% and 0.95% Lys groups (P<0.05). 3) Dietary Lys level had no significant effects on the contents of glucose, total cholesterol, uric acid, total protein and globulin, and the activities of alkaline phosphatase, glutamic-oxaloacetic transaminase and glutamic-pyruvic transaminase in serum of laying ducks (P>0.05). The contents of albumin and creatinine in serum and the ratio of albumin to globulin in 0.75% Lys group were significantly higher than those in 1.05% Lys group (P<0.05), the serum triglyceride content in 0.95% Lys group was significantly lower than that in 0.75% and 1.05% Lys groups (P<0.05 or P<0.01), the serum urea nitrogen content in 0.85% Lys group were significantly higher than that in 0.65% Lys group (P<0.05). 4) Dietary Lys level had no significant effects on the contents of insulin and glucagon in serum of laying ducks (P>0.05). The serum growth hormone content in 0.65% Lys group was significantly higher than that in 0.75%, 0.85% and 1.05% Lys groups (P<0.05 or P<0.01), the contents of cortisol, triiodothyronine (T₃) and thyroxine (T₄) in serum in 1.05% Lys group were significantly higher than that in 0.75% and 0.85% Lys groups (P<0.05 or P<0.01), and the T₃/T₄ in 0.65% Lys group was significantly higher than those in 1.05% Lys group (P<0.05). In conclusion, in this experimental condition, dietary 0.65% Lys level can fulfil the requirement of Linwu ducks aged from 22 to 28 weeks, and dietary 0.95% Lys level can obtain the best performance.

Key words： Lys; performance; egg quality; serum biochemical index; serum hormonal index; Linwu duck

Cite this article

LIN Qian, ZHANG Xu, JIANG Guitao, DAI Qiuzhong . Effects of Dietary Lysine Level on Performance, Egg Quality and Serum Biochemical and Hormonal Indices of Linwu Ducks Aged from 22 to 28 Weeks[J]. Chinese Journal of Animal Nutrition, 2014 , 26(8) : 2101 -2109 . DOI: 10.3969/j.issn.1006-267x.2014.08.011

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