Dietary Calcium Requirement of Linwu Ducks in Early Laying Period

HUANG Xuan; LI Chuang; JIANG Guitao; ZHANG Xu; WANG Xiangrong; DAI Qiuzhong

doi:10.3969/j.issn.1006-267x.2016.11.010

Chinese Journal of Animal Nutrition >

2016 , Vol. 28 >Issue 11: 3437 - 3444

DOI: https://doi.org/10.3969/j.issn.1006-267x.2016.11.010

POULTRY NUTRITION

Dietary Calcium Requirement of Linwu Ducks in Early Laying Period

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

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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 Science, Changsha 410205, China;
3. Hunan Co-Innovation Center of Animal Production Safety, Changsha 410128, China

Received date: 2016-04-15

Online published: 2016-11-18

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Abstract

This study was conducted to investigate the effects of dietary calcium (Ca) level on laying performance, egg quality, tibia indices and serum biochemical indices of Linwu ducks aged from 22 to 28 weeks, and then to estimated the Ca requirement of Linwu ducks in early laying period. A total of 200 healthy laying ducks with similar body weight were allocated into 5 groups with 5 replicates per group and 8 ducks in each replicate, and fed basal diets supplemented with 1.50%, 2.00%, 2.50%, 3.00% and 3.50% Ca, respectively. The pre-experimental period lasted for 7 days, and the experimental period lasted for 49 days. The results showed as follows:1) dietary Ca level had no significant effects on average daily feed intake and laying rate (P>0.05). The average egg weight in 1.50% Ca level group was significantly lower than that in the other groups (P<0.05). The daily egg yield in 3.00% Ca level group was significantly higher than that in 1.50% Ca level group (P<0.05), but there was no significant difference with the other groups (P>0.05). The qualified rate of egg in 2.50% and 3.00% Ca level group was significantly higher than that in 1.50% and 2.00% Ca level group (P<0.05). The feed to egg in 3.00% Ca level group was the lowest and significantly lower than that in 1.50% Ca level group (P<0.05). 2) Dietary Ca level had no significant effects on indices of egg quality of laying ducks (P>0.05). 3) Dietary Ca level significantly affected broking strength, Ca content in ash and Ca content in defatted tibia (P<0.05). At all above indices, 2.50%, 3.00% and 3.50% Ca level groups were significantly better than those in the 1.50% Ca level group. 4) The serum alkaline phosphatase (AKP) activity in 1.50% Ca level group significantly higher than that in the other groups (P<0.05). 5) According to the quadratic regression analysis, based on average egg weight, Ca content in ash and Ca content in defatted tibia, the optimal dietary levels of Ca for Linwu ducks were 2.79%, 2.98% and 2.98%, respectively. In conclusion, under the conditions of this experiment, to ensure the best laying performance, serum biochemical indices and tibia indices, the recommendation for Ca of Linwu ducks aged from 22 to 28 weeks is 2.79% to 2.98%.

Key words： Linwu ducks; calcium; laying performance; egg quality; tibia indices

Cite this article

HUANG Xuan , LI Chuang , JIANG Guitao , ZHANG Xu , WANG Xiangrong , DAI Qiuzhong . Dietary Calcium Requirement of Linwu Ducks in Early Laying Period[J]. Chinese Journal of Animal Nutrition, 2016 , 28(11) : 3437 -3444 . DOI: 10.3969/j.issn.1006-267x.2016.11.010

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