The Optimal Level of Cottonseed Meal in Diets of Meat Ducks during Different Growth Phases Based on Slaughter Performance

ZENG Qiufeng, BAI Peng, LIU Guannan, WANG Jianping, ZHANG Keying, DING Xuemei, BAI Shiping, LUO Yuheng

doi:10.3969/j.issn.1006-267x.2015.02.009

2015 , Vol. 27 >Issue 2: 391 - 399

DOI: https://doi.org/10.3969/j.issn.1006-267x.2015.02.009

Poultry Nutrition

The Optimal Level of Cottonseed Meal in Diets of Meat Ducks during Different Growth Phases Based on Slaughter Performance

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Key Laboratory for Animal Disease-Resistance Nutrition of Sichuan Province, Institute of Animal Nutrition, Sichuan Agricultural University, Ya'an 625014, China

Received date: 2014-09-22

Online published: 2015-02-09

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Abstract

This paper included two experiments which were conducted to investigate the effects of dietary cottonseed meal (CSM) level on slaughter performance of meat ducks during different growth phases, and to explore the optimal dietary CSM level based on slaughter performance. Experiments 1 and 2 were all used the single factor experimental design. The dietary CSM levels in experiment 1 were 0, 8.28%, 16.56%, 24.83% and 33.11%, respectively; the dietary CSM levels in experiment 2 were 0, 5.83%, 11.60%, 17.50% and 23.30%, respectively. In experiment 1, ducks fed test diets during 1 to 21 days of age, and then fed corn-soybean meal diets without CSM during 22 to 35 days of age. In experiment 2, ducks fed a normal diet without CSM during 1 to 14 days of age, and then fed test diets during 15 to 35 days of age. At 35 days of age, one duck per replicate was slaughtered in each experiment to determine the slaughter performance. The results showed as follows: 1) in experiment 1, the eviscerated with giblet yield and eviscerated yield of ducks increased in a linear manner with the increasing of dietary CSM level (P<0.05), but the abdominal fat weight and abdominal fat yield of ducks in 16.56% CSM group were significant lower than those in other groups (P<0.05). 2) In experiment 2, dietary CSM level had linearly and quadratic effects on the live weight, eviscerated with giblet weight, eviscerated weight and breast meat weight of ducks with the increasing of dietary CSM level (P<0.05), and had a quadratic effect on the carcass weight (P<0.05). The live weight, eviscerated with giblet weight, eviscerated weight, breast meat weight and breast meat yield of ducks in 23.30% CSM group were significant lower than those in other groups (P<0.05). 3) The optimal dietary CSM level was 7.51% to 14.78% of ducks based on different slaughter indexes. These results suggest that meat ducks aged from 1 to 21 days fed the diet containing 33.11% CSM which formulated based on digestible amino acid, and then fed the corn-soybean meal diet from 22 to 35 days of age have no effect on slaughter performance. Based on slaughter performance, the optimal level of CSM in diets of ducks aged from 15 to 35 days should not exceed 14.78%.

Key words： cottonseed meal; meat duck; breast meat yield; slaughter performance

Cite this article

ZENG Qiufeng, BAI Peng, LIU Guannan, WANG Jianping, ZHANG Keying, DING Xuemei, BAI Shiping, LUO Yuheng . The Optimal Level of Cottonseed Meal in Diets of Meat Ducks during Different Growth Phases Based on Slaughter Performance[J]. Chinese Journal of Animal Nutrition, 2015 , 27(2) : 391 -399 . DOI: 10.3969/j.issn.1006-267x.2015.02.009

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