Threonine Requirement of Linwu Ducks in Peak Laying Period

HUANG Xuan, LI Chuang, JIANG Guitao, ZHANG Xu, HU Yan, WANG Xiangrong, DAI Qiuzhong

doi:10.3969/j.issn.1006-267x.2017.10.009

Chinese Journal of Animal Nutrition >

2017 , Vol. 29 >Issue 10: 3489 - 3495

DOI: https://doi.org/10.3969/j.issn.1006-267x.2017.10.009

Molecular Nutrition

Threonine Requirement of Linwu Ducks in Peak Laying Period

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1. Department of Animal Nutrition and Feeding Technology, Hunan Institute of Animal Science and Veterinary Medicine, Changsha 410131, China;
2. Hunan Co-Innovation Center of Animal Production Safety, Changsha 410128, China;
3. Institute of Bast Fiber Crops, Chinese Academy of Agricultural Science, Changsha 410205, China

Received date: 2017-03-10

Online published: 2017-09-28

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Abstract

This experiment was conducted to study the effects of dietary threonine (Thr) level on growth performances, egg quality and serum biochemical indices of Linwu ducks aged form 30 to 38 weeks, and to evaluate Thr requirement of Linwu ducks during the peak laying period. A total of 200 healthy Linwu ducks with nearly same body weight and laying rate (P>0.05) were randomly assigned to 5 groups with 5 replicates in each group and 8 ducks in each replicate. Ducks in the five groups were fed basal diets supplemented with 0.55%, 0.60%, 0.65%, 0.70% and 0.75% Thr, respectively. The experiment lasted for 63 days. The results showed as followed:1) The feed to egg ratio in 0.65% Thr level group was significantly lower than that in 0.55% Thr level group (P<0.05). Dietary Thr level had no significant effects on average feed intake, laying rate, average egg weight and daily egg yield (P>0.05). 2) The albumen height and Haugh unit in 0.65%, 0.70% and 0.75% Thr level groups were significantly higher than those in 0.55% Thr level group (P<0.05). Dietary Thr level had no significant effects on egg shape index, eggshell thickness, yolk color, percentage of yolk, percentage of eggshell and percentage of albumen (P>0.05). 3) The serum total protein content in 0.70% Thr level group was significantly higher than that in 0.55% Thr level group (P<0.05). The serum glutamic-pyruvic transaminase activity in 0.65% Thr level group was significantly higher than that in 0.55% Thr level group (P<0.05). The serum urea nitrogen content in 0.65%, 0.70% and 0.75% Thr groups was significantly lower than that in 0.55% and 0.60% Thr level groups (P<0.05). Dietary Thr level had no significant effects on albumin, total cholesterol, triglyceride, uric acid, creatinine contents and alkaline phosphatase, aspartate aminotransferase activities in serum (P>0.05). 4) There was a quadratic behavior for feed/egg and serum urea nitrogen content according to the Thr level in the diets, with the requirements for those parameters established at 0.67% and 0.69%, respectively. The results indicate that the optimal Thr level in diets can improve laying performance, egg quality and protein availability of Linwu ducks. Synthesize these indicators, the suitable dietary Thr level of Linwu ducks in peak laying period (30 to 38 weeks of aged) is 0.67% to 0.69%.

Key words： threonine; Linwu ducks; requirement; serum biochemical indices

Cite this article

HUANG Xuan, LI Chuang, JIANG Guitao, ZHANG Xu, HU Yan, WANG Xiangrong, DAI Qiuzhong . Threonine Requirement of Linwu Ducks in Peak Laying Period[J]. Chinese Journal of Animal Nutrition, 2017 , 29(10) : 3489 -3495 . DOI: 10.3969/j.issn.1006-267x.2017.10.009

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