Effect of Inversion of Diurnally Fluctuating Environmental Temperature on the Laying Performance
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概要
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In the examination of laying performance of chicken in fluctuating environmental temperature, the relation between the environmental temperature and lighting is not always disregarded. In order to investigate the effect of inversion of diurnally fluctuating environmental temperature on the laying performance in the same lighting condition, experiments were carried out three times with 240 White Leghorn hens in the environmental controlled roomsFor acclimation to the environmental controlled room, the hens were reared at 20, 24 and 28°C constant temperature for each three dais. Following the 9 days' acclimation, the hens were divided into two groups. One group was reared under the sinusoidally changed temperature of which minimurn temperature was 20°C on 2a.m. and maximum one 33°C on 2 p.m. (Hot in Light group). The other group was reared under the inversional condition; the maximum 33°C on 2a.m. and the minimum 20°C on 2p.m. (Hot in Darkness group). The room was lighted for 14 hours from 5a.m. to 7p.m. and was maintained with 70±5 % in the relative humidity in the both groups. Duration of experimental period was 6 weeks and feed and water were ad. libitum.Egg production rate in the Hot in Darkness group was 2 to 4 percents higher than that in the Hot in Light group in the period from the second to sixth week. Egg weight in the Hot in Darkness group was 0.7g per egg heavier than the other group. However, these differences were not statistically significant. Feed intake per a day averaged 101g in the Hot in Light group and 108g in the Hot in Darkness, and it was significantly influenced by the inversion of fluctuating environmental temperature. Body weight gain in the Hot in Darkness group was 24g heavier than that in the Hot in Light. Strength and thickness of egg shell in the Hot in Darkness were improved compared with those in the Hot in Light.It was revealed that the laying performance was influenced by the lighting condition under the same fluctuating environmental temperature. Therefore, it was suggested that the adversed influence of high temperature on the laying performance was surpressed by the hot environment in the dark period in the case of the Hot in Darkness and that the laying per formance was promoted by cool environment in the light period in the same case.
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