EFFECT OF DAYLENGTH ON THE GROWTH OF LAMBS .2. BLOOD-CONCENTRATIONS OF GROWTH-HORMONE, PROLACTIN, INSULIN AND THYROXINE, AND THE EFFECT OF FEEDING

被引：90

作者：

FORBES, JM ^{[1
]}

DRIVER, PM ^{[1
]}

BROWN, WB ^{[1
]}

SCANES, CG ^{[1
]}

HART, IC ^{[1
]}

机构：

[1] NATL INST RES DAIRYING,READING RG2 9AT,BERKSHIRE,ENGLAND

来源：

ANIMAL PRODUCTION | 1979年 / 29卷 / AUG期

关键词：

D O I：

10.1017/S0003356100012149

中图分类号：

S8 [畜牧、动物医学、狩猎、蚕、蜂];

学科分类号：

0905 ;

摘要：

1. The levels of four hormones which might be involved in the control of growth have been measured in the blood of lambs kept in 16 or 8 h daylengths for 4 months in each of two experiments. Under the conditions of these experiments long daylength stimulated growth. 2. Prolactin concentration was significantly increased by long day-length and by ad libitum feeding, compared with short daylength and restricted feeding, respectively. 3. Growth hormone, insulin and thyroxine concentrations were unaffected by daylength. Ad libitum feeding caused lower growth hormone and higher insulin concentrations than restricted feeding, and growth hormone levels fell after the morning feed. 4. Of the hormones measured, prolactin is most worthy of further study as a possible mediator of the effects of long daylength on growth. © 1979, British Society of Animal Science. All rights reserved.

引用

页码：43 / 51

页数：9

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