Fertility and Hatchability of Eggs Produced by Hens Subjected to Various Photoperiods
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概要
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Five experiments were conducted during the period from September to June over a period of six years. Three breeds (New Hampshires, White Leghorns, and White Plymouth Rocks) which had just finished the yearly laying test were used in this study. The controls were kept under the natural short-daylength and the experimental groups were exposed to 14-, 16-, 20- or 24-hours of light. All of the hens used were artificially inseminated weekly with 0.02ml. of pooled semen obtained from New Hampshire males maintained under natural daylength. The control groups (natural daylength) always manifested the highest fertility, showing highly significant differences between the two groups of the experimental and the control in two out of five trials. Although there were no significant differences among the greater part of the lighted groups, longer daylength did not bring a desirable effect on fertility. Hatchability in the control group was also higher than that in the experimental. Generally, daily light for hens may give rise to undesirable effects upon embryonic development of the eggs produced by them. Percentages of unhatched eggs including early dead germs were low in the majority of the control groups. From these data it was concluded that fertility and hatchability of eggs from the hens raised under the natural short-daylength were higher than those from the hens exposed to longer than the natural daylength. Consequently artificial longer daylength for hens may unfavorably affect these traits.
- 横浜国立大学の論文
- 1975-10-30
著者
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Saeki Yuichi
Department Of Biochemistry And Applied Biosciences Faculty Of Agriculture University Of Miyazaki
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Saeki Yuichi
Department Of Agricultural Chemistry Faculty Of Agriculture Kyushu University
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Akita Tomiji
Department Of Animal Genetics National Institute Of Animal Industry
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