低セレン飼料給与が若雌鶏,産卵鶏の血漿LH, FSH及びエストラジオール濃度に及ぼす影響

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  • Effects of low-selenium diet on levels of plasma luteinizing hormone, follicle-stimulating hormone and estradiol in pullets and laying hens.

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Two experiments were done to study the effects of a low-selenium diet on the plasma levels of luteinizing hormone (LH), follicle-stimulating hormone (FSH) and estradiol of pullets and laying hens.<br>Thirteen pullets 169 days old and twelve laying hens 530 days old were used. They were fed a diet with selenium as DL-selenomethionine added to a low-selenium diet, with 0.24mg of selenium per kg of feed, or a diet without selenium during the experiment. The plasma levels of LH, FSH, estradiol and selenium, and the plasma GSHpx activity were assayed regularly.<br>The plasma LH levels of the pullets decreased significantly with the lowselenium diet, and that of the laying hens also decreased, but not significantly. The level of plasma estradiol of both pullets and laying hens tended to decrease. The plasma FSH level was not affected. The plasma selenium level and GSHpx activity of both pullets and laying hens significantly decreased with the lowselenium diet. These results suggested that the decreased egg production rate caused by the low-selenium diet involved the factors, such as the effect of a low level of plasma LH on ovulation, the effect of a low level of plasma LH on the release of estradiol from the ovary, and the effect of a low plasma level on estradiol on the compounding of precursor of egg in the liver.

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