Changes in serum somatotropin, somatotropin mRNA, and serum and follicular insulin-like growth factor-I in response to feed restriction in cows actively immunized against growth hormone-releasing factor

Cyclic cows immunized against growth hormone-releasing factor (GRFi, n = 19), human serum albumin (HSAi, n = 10), or not immunized (CON, n = 18) were used to investigate the effects of feed restriction on serum and pituitary somatotropin (ST), pituitary ST mRNA, and serum and follicular IGF-I. Cows...

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Bibliographic Details
Published in:	Journal of animal science Vol. 71; no. 11; pp. 3033 - 3042
Main Authors:	Kirby, C.J, Armstrong, J.D, Huff, B.G, Stanko, R.L, Harvey, R.W, Heimer, E.P, Campbell, R.M
Format:	Journal Article
Language:	English
Published:	United States Am Soc Animal Sci 01-11-1993 Oxford University Press
Subjects:	ACIDE GRAS ACIDOS GRASOS ALIMENTACION RACIONADA ALIMENTATION RATIONNEE Animals ARN MENSAJERO ARN MESSAGER Blotting, Northern BOVIN DE BOUCHERIE Cattle Cattle - metabolism DESARROLLO EMBRIONARIO DEVELOPPEMENT EMBRYONNAIRE Diet Estradiol - blood ESTROGENOS Fatty Acids, Nonesterified - blood Female Follicular Fluid - chemistry Food Deprivation - physiology GANADO DE CARNE Growth Hormone - blood Growth Hormone - genetics Growth Hormone-Releasing Hormone - immunology HORMONAS HORMONE Hormones IMMUNISATION Immunization - veterinary Immunization, Secondary - veterinary INMUNIZACION Insulin-Like Growth Factor I - analysis INSULINA INSULINE LIQUIDE BIOLOGIQUE LIQUIDOS CORPORALES Luteinizing Hormone - blood OESTROGENE Pituitary Gland - chemistry PLASMA SANGUIN PLASMA SANGUINEO Ribonucleic acid RNA RNA, Messenger - analysis SERUM SANGUIN SOMATOTROPINA SOMATOTROPINE SUERO SANGUINEO VACA VACHE
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Summary:	Cyclic cows immunized against growth hormone-releasing factor (GRFi, n = 19), human serum albumin (HSAi, n = 10), or not immunized (CON, n = 18) were used to investigate the effects of feed restriction on serum and pituitary somatotropin (ST), pituitary ST mRNA, and serum and follicular IGF-I. Cows were either fed 2.7 kg/d cottonseed hulls (R) or given ad libitum access to feed (AL) for 15 d. Ovaries bearing the largest follicle and pituitaries were collected on d 14, at 44 to 45 h after injection of prostaglandin F2 alpha. Data from CON and HSAi cows were similar; thus, data were combined (represented as CON). Serum ST (nanograms/milliliter) on d 13 was greater (P 0.09) in CON-R (5.3) than in CON-AL (3.9), whereas ST in GRFi-AL (1.1) and GRFi-R (1.1; pooled SE
Bibliography:	9442147 L52 L53 L02 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0021-8812 1525-3163
DOI:	10.2527/1993.71113033x