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Optimization of Dietary Zinc Requirement for Broiler Breeder Hens of Chinese Yellow-Feathered Chicken

by 1,2,3,4,5,6,†, 2,3,4,5,6,7,†, 2,3,4,5,6, 2,3,4,5,6, 2,3,4,5,6, 2,3,4,5,6, 2,3,4,5,6, 2,3,4,5,6, 2,3,4,5,6,* and 2,3,4,5,6,*
1
College of Animal Science, South China Agricultural University, Guangzhou 510642, China
2
Institute of Animal Science, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China
3
State Key Laboratory of Livestock and Poultry Breeding, Guangzhou 510640, China
4
Key Laboratory of Animal Nutrition and Feed Science in South China, Guangzhou 510640, China
5
Ministry of Agriculture, Guangdong Public Laboratory of Animal Breeding and Nutrition, Guangzhou 510640, China
6
Guangdong Key Laboratory of Animal Breeding and Nutrition, Guangzhou 510640, China
7
Department of Poultry Production, Faculty of Agriculture, Assiut University, Assiut 71526, Egypt
*
Authors to whom correspondence should be addressed.
These authors contributed equally.
Animals 2019, 9(7), 472; https://doi.org/10.3390/ani9070472
Received: 18 May 2019 / Revised: 11 July 2019 / Accepted: 15 July 2019 / Published: 23 July 2019
(This article belongs to the Section Animal Nutrition)
China is the second-largest global producer of chicken meat, almost half of which is from the Chinese yellow-feathered breed; a systematic program has been initiated to improve its feeding standards. This study evaluated the optimal requirement of dietary zinc for maximal egg production, egg quality, tibial quality, and antioxidant indices of laying broiler breeders. The results revealed several beneficial effects of supplementary zinc on egg production, feed conversion ratio, yolk zinc content, tibial quality and the antioxidant indices in the serum, liver and ovary. The optimal zinc requirement was estimated based on a regression model.
This study aimed to establish the optimal dietary zinc requirement of Chinese yellow-feathered Lingnan broiler breeders. A total of 576 breeder hens aged 58 weeks were randomly assigned to six treatments, each with 6 replicates of 16 birds (n = 96/treatment). The hens were fed either a basal diet (22.81 mg/kg Zn) or the same basal diet supplemented with additional 24, 48, 72, 96, and 120 mg Zn/kg up to 65 weeks of age. Compared to the results of birds fed the basal diet (22.81 mg Zn/kg), the dietary supplementation with additional Zn (mg/kg) showed higher egg laying rate (at 48–120 mg), EM (at 96 mg/kg), yolk Zn content (at 24–120 mg/kg), fertility (at 48–120 mg/kg), hatchability (at 48–96 mg/kg), tibial breaking strength (at 24–48 mg/kg), tibial ash content (at 48 mg/kg), serum CuZnSOD activity (at 72 mg/kg) and T-AOC (at 48 mg/kg), and ovarian CuZnSOD and GSH-Px activities (at 96–120 mg/kg), and lower FCR (at 96 mg/kg). The regression model showed that the optimal supplemental Zn for maximal egg laying rate, yolk Zn content, fertility, and hatchability of Chinese yellow-feathered broiler breeders aged 58 to 65 weeks were 71.09, 92.34, 94.44 and 98.65 mg/kg diet, respectively. View Full-Text
Keywords: Zn requirement; productive and reproductive performance; egg quality; tibial quality; antioxidant enzymes; Chinese yellow-feathered broiler breeder hens Zn requirement; productive and reproductive performance; egg quality; tibial quality; antioxidant enzymes; Chinese yellow-feathered broiler breeder hens
MDPI and ACS Style

Li, L.; Abouelezz, K.F.M.; Gou, Z.; Lin, X.; Wang, Y.; Fan, Q.; Cheng, Z.; Ding, F.; Jiang, S.; Jiang, Z. Optimization of Dietary Zinc Requirement for Broiler Breeder Hens of Chinese Yellow-Feathered Chicken. Animals 2019, 9, 472. https://doi.org/10.3390/ani9070472

AMA Style

Li L, Abouelezz KFM, Gou Z, Lin X, Wang Y, Fan Q, Cheng Z, Ding F, Jiang S, Jiang Z. Optimization of Dietary Zinc Requirement for Broiler Breeder Hens of Chinese Yellow-Feathered Chicken. Animals. 2019; 9(7):472. https://doi.org/10.3390/ani9070472

Chicago/Turabian Style

Li, L., K. F.M. Abouelezz, Z. Gou, X. Lin, Y. Wang, Q. Fan, Z. Cheng, F. Ding, S. Jiang, and Z. Jiang. 2019. "Optimization of Dietary Zinc Requirement for Broiler Breeder Hens of Chinese Yellow-Feathered Chicken" Animals 9, no. 7: 472. https://doi.org/10.3390/ani9070472

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