PMID: 12220814Sep 11, 2002Paper

Follicular development and steroid concentrations in cows with different levels of fertility raised under nutritional stress

Animal Reproduction Science
J F C OliveiraL F S Costa


The aim of the present study was to characterize ovarian follicular development and steroid concentrations during postpartum and the estrous cycle of Brangus Ibagé cows (3/8 Nelore + 5/8 Aberdeen Angus) with different levels of fertility. Cows were classified as having high or low fertility according to the calving interval (CI). The average CI of the herd from which cows used in this study were selected was 404.6+/-5.44 and 711.2+/-20.89 days for the high and low fertility groups, respectively. Four cows of high fertility and five cows of low fertility had calves removed between 70 and 100 days after parturition. Ovarian activity was monitored daily by ultrasound for 16 days after calf removal. Days to emergency of the first follicular wave after calf removal, number of follicles with diameter >9 mm, growth rate of largest follicle, maximum diameter of largest follicle, length (days) and number of follicular waves were recorded. During this period, blood was collected daily for measurements of serum progesterone (P(4)) and estradiol (E(2)) concentrations. In another experiment, ovarian activity and P(4) and E(2) concentrations were examined during estrous cycle in five cows of high fertility and four cows of low fertility. Ova...Continue Reading


Mar 1, 1990·Journal of Reproduction and Fertility·J D SavioJ F Roche
Nov 1, 1990·Journal of Reproduction and Fertility·M G MurphyJ F Roche
Mar 1, 1997·Genome Research·S M KappesC W Beattie
Nov 1, 1985·Theriogenology·C S WhisnantJ B Hall

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