Effects of Dietary Metabolizable Energy Level on Laying Performance, Egg Quality and Serum Biochemical Indices of Cage-Rearing Laying Ducks

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

doi:10.3969/j.issn.1006-267x.2018.10.012

2018 , Vol. 30 >Issue 10: 3882 - 3888

DOI: https://doi.org/10.3969/j.issn.1006-267x.2018.10.012

Molecular Nutrition

Effects of Dietary Metabolizable Energy Level on Laying Performance, Egg Quality and Serum Biochemical Indices of Cage-Rearing Laying Ducks

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1. Department of Animal Nutrition and Feeding Technology, Hunan Institute of Animal Science and Veterinary Medicine, Changsha 410131, China;
2. Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha 410205, China;
3. Hunan Collaborative Innovation Center of Animal Production Safety, Changsha 410128, China;
4. Agriculture, Forestry and Fisheries Service Center of Lingjiaotang Town, Yongzhou 425199, China

Received date: 2018-03-23

Online published: 2018-10-20

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Abstract

This experiment was conducted to study the effects of dietary metabolizable energy (ME) level on laying performance, egg quality and serum biochemical indices of cage-rearing laying ducks during peak laying period. Two hundred and fifty 29-week-old healthy Linwu ducks with a similar body weight were randomly assigned to 5 groups with 5 replicates in each group and 10 ducks in each replicate. Using in a single factorial design trial, the ducks were fed the diets with ME levels of 10.09, 10.59, 11.09, 11.59 and 12.09 MJ/kg, respectively, and dietary crude protein level was 18% in every group' diet. The adaptation period lasted for 7 days and the formal period lasted for 63 days. The results showed as follows:1) the average daily feed intake was linear significantly decreased with dietary ME level increased (P<0.05). The laying rate and daily egg yield of dietary ME level 12.09 MJ/kg group were significantly lower than those of other groups (P<0.05). The feed to egg ratio of dietary ME level 10.09 MJ/kg group was the highest, and significantly higher than that of other groups (P<0.05). 2) Dietary ME level had no significant effects on egg quality indices of cage-rearing laying ducks (P>0.05). 3) The contents of cholesterol and low density lipoprotein in serum were linear significantly increased with dietary ME level increasing (P<0.05), while the serum urea nitrogen content was linear significantly decreased with dietary ME level increasing (P<0.05). The serum glucose content of dietary ME level 12.09 MJ/kg group was significantly higher than that of dietary ME level 10.09 MJ/kg group (P<0.05). In conclusion, the regression analysis shows that selected high laying rate, high daily egg yield and low feed to egg ratio as indicators, the recommended dietary ME level of Linwu ducks aged form 29 to 38 weeks is 10.73 to 11.29 MJ/kg.

Key words： cage-rearing laying ducks; metabolizable energy; laying performance; egg quality; serum biochemical indices

Cite this article

HUANG Xuan, LI Chuang, XIONG Huali, JIANG Guitao, ZHANG Xu, WANG Xiangrong, HU Yan, DAI Qiuzhong . Effects of Dietary Metabolizable Energy Level on Laying Performance, Egg Quality and Serum Biochemical Indices of Cage-Rearing Laying Ducks[J]. Chinese Journal of Animal Nutrition, 2018 , 30(10) : 3882 -3888 . DOI: 10.3969/j.issn.1006-267x.2018.10.012

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