NDLI: Ovarian follicular populations and in vitro steroidogenesis on three different days of the bovine estrous cycle.

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Ovarian follicular populations and in vitro steroidogenesis on three different days of the bovine estrous cycle.

Content Provider	Semantic Scholar
Author	Skyer, D. M. Garverick, H. Allen
Copyright Year	1987
Abstract	This study was undertaken to determine changes in follicular populations on ovaries of dairy cows during three stages of the estrous cycle and their steroidogenic capacity in vitro. Numbers of small (2.0 to 5.0 mm), intermediate (5.1 to 10 mm) and large (greater than 10 mm) antral follicles on ovaries of multiparous cows and heifers (n = 31) in the early luteal (d 4), mid-luteal (d 12) and follicular phase (d 19) of the estrous cycle were determined (d 0 = estrus), and steroidogenic capacity of intermediate and large follicles was measured in vitro. Total number of follicles and number of small follicles were greatest (P less than .05) on d 19 compared with d 12, with numbers on d 4 not different from either d 12 or 19. Intermediate follicles were fewer (P less than .05) on d 19 compared with d 4 or 12. Numbers of large follicles did not change. The proportion of estrogen active (EA) follicles was greater (P less than .05) on d 19 compared with d 4 or 12. Accumulation of estradiol-17 beta (E) into culture medium by intermediate follicles decreased (P less than .05) with increasing days of the estrous cycle, while accumulation of progesterone (P) was greater on d 19. In large follicles, accumulation of E into culture medium was greatest (P less than .05) on d 19 and the lowest on d 12 (P less than .05). In summary, the proportion of EA follicles increases during the preovulatory period, and E production increases in large EA follicles.(ABSTRACT TRUNCATED AT 250 WORDS)
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://www.animalsciencepublications.org/publications/jas/pdfs/64/6/JAN0640061710
PubMed reference number	3597186v1
Volume Number	64
Issue Number	6
Journal	Journal of animal science
Language	English
Access Restriction	Open
Subject Keyword	Cattle Culture Media Dairy Estradiol Estrogens Estrous Cycle Estrus Ethacrynic Acid Ovarian Follicle Progesterone Steroid biosynthesis
Content Type	Text
Resource Type	Article

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