Influence of dietary-induced weight changes on serum luteinizing hormone, estrogen and progesterone in the bovine female

Biology of Reproduction
K ImakawaJ E Kinder

Abstract

The working hypothesis in the present study was that changes in concentrations and secretory patterns of luteinizing hormone (LH), 17 beta estradiol (E2), and progesterone in sexually mature beef heifers fed diets deficient in energy are related to changes in body weight of the animals. Another important component of the study was to determine if concentrations and secretion patterns of the reproductive hormones changed over time as feeding of the experimental diets continued. Twelve Red Angus X Hereford heifers (20 mo of age; 355 +/- 7 kg) were assigned randomly to receive a low- (L, n = 7) or high- (H, n = 5) energy diet for 100 days (Day 0 = day of initiation of dietary treatment). All heifers were exhibiting estrous cycles at regular intervals when the experiment was initiated and continued to exhibit estrous cycles at regular intervals throughout the study. Stage of the estrous cycle was synchronized in all 12 heifers by administration of prostaglandin F2 alpha (PGF2 alpha) on two occasions (Days 45 and 75) during the experiment. Serial blood samples (taken at 12-min intervals for 4 h) were collected at 0, 12, 24, 36, 48, and 60 h after the PGF2 alpha injections (Days 45-47 and 75-77) to determine patterns of LH secretion ...Continue Reading

Citations

Apr 15, 2015·Frontiers in Neuroscience·Atsushi FukushimaToshiya Funabashi
Mar 1, 1989·Journal of Dairy Science·J D Ferguson, W Chalupa
Feb 18, 2004·The Journal of Reproduction and Development·Tomomi TanakaYoshihiro Kaneda

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