Estimation of calcium requirements for optimal productive and reproductive performance, eggshell and tibial quality in egg-type duck breeders
文献类型： 外文期刊
作者： Xia, W. G. 1 ; Chen, W. 1 ; Abouelezz, K. F. M. 1 ; Azzam, M. M. M. 1 ; Ruan, D. 1 ; Wang, S. 1 ; Zhang, Y. N. 1 ; Luo, X 1 ;
作者机构： 1.Guangdong Acad Agr Sci, State Key Lab Livestock & Poultry Breeding,Inst A, Key Lab Anim Nutr & Feed Sci South China,Minist A, Key Lab Poultry Genet & Breeding Minist Agr,Guang, Guangzhou 510640, Guangdong, Peoples R China
2.Assiut Univ, Fac Agr, Dept Poultry Prod, Assiut 71526, Egypt
3.Mansoura Univ, Fac Agr, Poultry Prod Dept, Mansoura 35516, Egypt
关键词： dietary calcium; laying ducks; ovarian morphology; plasma hormones; gene expression
期刊名称：ANIMAL （ 影响因子：3.24； 五年影响因子：3.223 ）
ISSN： 1751-7311
年卷期： 2019 年 13 卷 10 期
页码：
收录情况： SCI
摘要： Optimizing the dietary calcium (Ca) level is essential to maximize the eggshell quality, egg production and bone formation in poultry. This study aimed to establish the Ca requirements of egg-type duck breeders from 23 to 57 weeks of age on egg production, eggshell, incubation, tibial, plasma and ovary-related indices, as well as the expression of matrix protein-related genes. Totally, 450 Longyan duck breeders aged 21 weeks of age were allotted randomly into five treatments, each with six replicates of 15 individually caged birds. The data collection started from 23 weeks of age and continued over the following 35 weeks. The five groups corresponded to five dietary treatments containing either 2.8%, 3.2%, 3.6%, 4.0% or 4.4% Ca. The tested dietary Ca levels increased (linear, P <0.01) egg production and egg mass, and linearly improved (P <0.01) the feed conversion ratio (FCR). Increasing the dietary Ca levels from 2.8% to 4.4% increased (P <0.01) the eggshell thickness and eggshell content. The tested Ca levels showed a quadratic effect on eggshell thickness and ovarian weight (P <0.01); the highest values were obtained with the Ca levels 4.0% and 3.6%, respectively. Dietary Ca levels affected the small yellow follicles (SYF) number and SYF weight/ovarian weight, and the linear response (P <0.01) was significant vis-a-vis SYF number. In addition, dietary Ca levels increased (P <0.05) the tibial dry weight, breaking strength, mineral density and ash content. Plasma and tibial phosphorus concentration exhibited a quadratic (P <0.01) response to dietary Ca levels. Plasma calcitonin concentration linearly (P <0.01) increased as dietary Ca levels increased. The relative expression of carbonic anhydrase 2 in the uterus rose (P <0.01) with the increment of dietary Ca levels, and the highest value was obtained with 3.2% Ca. In conclusion, Longyan duck breeders fed a diet with 4.0% Ca had superior eggshell and tibial quality, while those fed a diet with 3.6% Ca had the heaviest ovarian weights. The regression model indicated that the dietary Ca levels 3.86%, 3.48% and 4.00% are optimal levels to obtain maximum eggshell thickness, ovarian weight and tibial mineral density, respectively.
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