Tryptophan Optimal Requirement for Laying Ducks in Peak Laying Period

ZHANG Hanxing; CHEN Wei; LI Yan; WANG Shuang; RUAN Dong; YU Deqian; WANG Shenglin; ZHENG Chuntian; LIN Yingcai

doi:10.3969/j.issn.1006-267x.2016.04.013

Chinese Journal of Animal Nutrition >

2016 , Vol. 28 >Issue 4: 1060 - 1067

DOI: https://doi.org/10.3969/j.issn.1006-267x.2016.04.013

POULTRY NUTRITION

Tryptophan Optimal Requirement for Laying Ducks in Peak Laying Period

ZHANG Hanxing ,
CHEN Wei ,
LI Yan ,
WANG Shuang ,
RUAN Dong ,
YU Deqian ,
WANG Shenglin ,
ZHENG Chuntian ,
LIN Yingcai

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Institute of Animal Science, Guangdong Academy of Agricultural Sciences, State Key Laboratory of Livestock and Poultry Breeding, Key Laboratory of Animal Nutrition and Feed Science in South China, Ministry of Agriculture, Guangdong Public Laboratory of Animal Breeding and Nutrition, Guangdong Key Laboratory of Animal Breeding and Nutrition, Guangzhou 510640, China

Received date: 2015-11-10

Online published: 2016-04-11

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Abstract

This experiment aimed to investigate the effects of dietary tryptophan level on laying performance, egg quality, body antioxidant parameters and slaughter parameters of laying ducks, and to evaluate tryptophan requirement of ducks during the peak laying period. Nine hundred 120-day-old Shanma ducks were randomly assigned into 6 groups with 6 replicates per group and 25 ducks per group. Ducks in the 6 groups were fed the experimental diets which tryptophan levels were 0.12%, 0.16%, 0.20%, 0.24%, 0.28% and 0.32%, respectively. The experiment lasted for 20 weeks. The results showed as follows:1) dietary tryptophan level had no significant effects on egg production, average egg weight, daily egg mass, feed/egg and so on(P>0.05), but the egg production and daily egg mass in the 0.20% group had the highest value. Dietary tryptophan level had no significant effects on egg quality such as eggshell strength, Haugh unit, yolk weight, yolk percentage, eggshell weight, eggshell percentage and thickness(P>0.05), whereas, dietary tryptophan level had significant effect on yolk color(P<0.05), and the yolk color in 0.20% group significantly lower than that in other groups(P<0.05). 2) Dietary tryptophan level had no significant effect on the content of albumin, total protein, uric acid in serum(P>0.05). 3) Dietary tryptophan level had no significant effect on serum and liver antioxidant parameters except liver total superoxide dismutase activity(P>0.05). 4) Dietary tryptophan level had no significant effect on oviduct weight, oviduct length and ovary weight(P>0.05). Based on the broken-line model, dietary 0.20% tryptophan level is recommended for egg production in peak laying ducks.

Key words： laying ducks; tryptophan; laying performance; egg quality; antioxidant parameters

Cite this article

ZHANG Hanxing , CHEN Wei , LI Yan , WANG Shuang , RUAN Dong , YU Deqian , WANG Shenglin , ZHENG Chuntian , LIN Yingcai . Tryptophan Optimal Requirement for Laying Ducks in Peak Laying Period[J]. Chinese Journal of Animal Nutrition, 2016 , 28(4) : 1060 -1067 . DOI: 10.3969/j.issn.1006-267x.2016.04.013

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