Effects of Low Crude Protein Diets Supplemented With Amino Acids on Slaughter Performance and Composition of Breast Muscle of Mule Ducks

LI Zhongrong, CHEN Wanru, YE Dingcheng, LIU Jing

doi:10.3969/j.issn.1006-267x.2015.06.003

2015 , Vol. 27 >Issue 6: 1672 - 1680

DOI: https://doi.org/10.3969/j.issn.1006-267x.2015.06.003

Poultry Nutrition

Effects of Low Crude Protein Diets Supplemented With Amino Acids on Slaughter Performance and Composition of Breast Muscle of Mule Ducks

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Institute of Husbandry and Veterinary Medicine, Fujian Academy of Agricultural Sciences, Fuzhou 350013, China

Received date: 2014-12-29

Online published: 2015-06-17

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Abstract

This experiment was conducted to study the effect of low crude protein (CP) diets supplemented with amino acids on slaughter performance and composition of breast muscle of Mule ducks. A total of 450 one-day-old Mule ducks were randomly assigned to 3 groups with 5 replicates and 30 ducks in each replicate (50% males, 50% females). The control group received the diet included the normal level of CP (19% CP during 1 to 21 days of age, 16% CP during 22 to 56 days of age), and the level of CP in diets of experimental group Ⅰ and experimental group Ⅱ were decreased by 1% and 2%, respectively, while supplied with compounded amino acids. The feeding trial lasted for 56 days. The results showed as follows: 1) there was no significant effect on slaughter performance of ducks included slaughter rate, carcass yield rate, abdominal fat rate, leg rate, leg muscle rate, breast muscle rate, lean meat rate and subcutaneous fat rate at 56 days of age (P>0.05). 2) Compared with the control group, the content of crude fat in breast muscle of ducks at 56 days of age was significantly increased by 10.9% and 28.3% associated with the descending of CP level in feed by 1% and 2% (P <0.05), meanwhile, the content of CP in breast muscle of ducks at 56 days of age was decreased by 1.1% and 2.5%, respectively (P <0.05); most of amino acid contents in breast muscle of ducks among all groups had no obvious difference (P > 0.05), but Met and Met+Cys contents in breast muscle of female ducks in experimental group Ⅱ were significantly decreased (P <0.05). These results indicate that dietary CP decreased by 1% to 2% have no obvious effects on growth performance, slaughter performance and most of amino acid contents in breast muscle of Mule ducks, but can significantly increase the crude fat content and decrease CP content of breast muscle under the condition that amino acid in diet meet the need of birds.

Key words： Mule duck; crude protein; slaughter performance; muscle composition

Cite this article

LI Zhongrong, CHEN Wanru, YE Dingcheng, LIU Jing . Effects of Low Crude Protein Diets Supplemented With Amino Acids on Slaughter Performance and Composition of Breast Muscle of Mule Ducks[J]. Chinese Journal of Animal Nutrition, 2015 , 27(6) : 1672 -1680 . DOI: 10.3969/j.issn.1006-267x.2015.06.003

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