PMID: 9437573Jan 23, 1998Paper

Effect of exogenous estradiol on plasma concentrations of somatotropin, insulin-like growth factor-I, insulin-like growth factor binding protein activity, and metabolites in ovariectomized Angus and Brahman cows

Domestic Animal Endocrinology
R B SimpsonT H Welsh

Abstract

To determine the effect of breed and estradiol-17 beta on selected hormones and metabolites, ovariectomized (> or = 3 mo) Angus (n = 14) and Brahman (n = 12) cows were paired by age and body weight and randomly assigned as either nonimplanted controls (CON) or implanted with estradiol (E2) for 45 d. After Day 7 and through Day 42, plasma concentration of somatotropin was greater for E2 than CON cows (treatment x day, P < 0.05). During an intensive blood sampling on Day 36, E2 cows tended (P < 0.10) to have greater somatotropin pulse amplitudes than CON cows, but other parameters of somatotropin release were not affected (P > 0.10) by E2 treatment. The effect of breed was apparent on Day 36 as Brahman cows had greater (P < 0.05) somatotropin pulse amplitude, basal secretion, and mean concentration than Angus cows. Overall, plasma concentration of IGF-I was greater (P < 0.01) for E2 than CON cows (158.3 vs. 104.2 ng/ml) and was greater for Brahman than Angus cows (164.1 vs. 98.4 ng/ml). However, there was a trend (P < 0.10) for a treatment x breed x day interaction for IGF-I (i.e., the magnitude of increase in IGF-I concentration was greater in E2-Angus than E2-Brahman cows). After Day 7 and through Day 42, total plasma IGF bindi...Continue Reading

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Citations

Apr 15, 2000·Domestic Animal Endocrinology·T HashizumeN Matsumoto
Mar 7, 2001·Small Ruminant Research : the Journal of the International Goat Association·W J. EnrightD J. Prendiville
Feb 18, 2004·The Journal of Reproduction and Development·Sumie NonakaShigeo Hara
Aug 22, 2008·Reproduction : the Official Journal of the Society for the Study of Fertility·Ken-Go HayashiAkio Miyamoto
Sep 28, 2001·Journal of Dairy Science·S M MacielL J Spicer
Nov 19, 2018·Translational Animal Science·Philipe MorielJose L M Vasconcelos
Feb 21, 2004·Journal of Animal Science·S E EchternkampL J Spicer
Jan 22, 2004·Clinical Cancer Research : an Official Journal of the American Association for Cancer Research·Shaan M RazaRaymond Sawaya

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