Molecular Nutrition

Effect of Cyclic High Temperature on Performance, Egg Shell Quality and Metabolism of Calcium and Phosphorous of Laying Hens

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  • 1. Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China;
    2. College of Animal Science and Technology, Northeast Agricultural University, Harbin 150030, China

Received date: 2017-01-12

  Online published: 2017-08-02

Abstract

The aim of present experiment was to simulate the variation of high ambient temperature in laying hen house in summer, and evaluate the effects of different cyclic high temperature on performance, egg quality and metabolism of calcium and phosphorus of laying hens. A total of 288 Hy-Line Brown hens at 28 weeks of age were randomly divided into 4 groups with 6 replicates each and 12 hens in each replicate and housed in 4 artificially controlled environment chambers. Four groups were 21 ℃ normal thermal group (ad libitum), 27 to 30 ℃ cyclic high-temperature group (ad libitum), 29 to 35 ℃ cyclic high-temperature group (ad libitum) and 21 ℃ pair-feeding group (fed the last daily feed consumption of chickens in 29 to 35 ℃ high cyclic temperature group), respectively. The experiment lasted for 4 weeks. The results showed that compared with 21 ℃ normal thermal group, the average daily feed intake, body weight gain, average egg weight, egg shell strength and yolk color were significant decreased in 27 to 30 ℃ cyclic high-temperature group (P<0.05), and there was no significant difference in the other egg quality related indices between two groups (P>0.05), while the average daily feed intake, body weight gain, average egg weight, laying rate, egg shell strength, egg shell thickness, albumen height and yolk color were all significant decreased (P<0.05) in 29 to 35 ℃ cyclic high-temperature group. Meanwhile, the metabolic rates of calcium and phosphorus of chickens in 27 to 30 ℃ cyclic high-temperature group and 29 to 35 ℃ cyclic high-temperature group had no significant difference compared with 21 ℃ normal thermal group (P>0.05), but the absorption of calcium and phosphorus was significant decreased (P<0.05). Compared with 21 ℃ pair-feeding group, the average egg weight and shell strength were significantly decreased (P<0.05), and the ratio of feed to egg was significantly increased (P<0.05), while the egg quality, metabolic rates and absorption of calcium and phosphorus were not significantly different (P>0.05) in 29 to 35 ℃ cyclic high-temperature group. The results of present study demonstrated that body weight gain, average egg weight and egg shell quality were significantly decreased under 27 to 30 ℃ and 29 to 35 ℃ cyclic high temperature, while the laying rate, albumen height and yolk color were also significant decreased under 29 to 35 ℃. The effects of high ambient temperature on laying performance, albumen height and yolk color of laying hens may be associated with the decrease of feed intake. The high temperature may have direct effects on egg shell formation, or the decreasing in absorption of calcium and phosphorus under high temperature may also affect the egg shell quality.

Cite this article

DIAO Huajie, FENG Jinghai, ZHANG Minhong, DIAO Xinping, ZHOU Ying, LI Meng, WANG Xuejie . Effect of Cyclic High Temperature on Performance, Egg Shell Quality and Metabolism of Calcium and Phosphorous of Laying Hens[J]. Chinese Journal of Animal Nutrition, 2017 , 29(8) : 2689 -2696 . DOI: 10.3969/j.issn.1006-267x.2017.08.011

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