The absence of corpus luteum formation alters the endocrine profile and affects follicular development during the first follicular wave in cattle

Reproduction : the Official Journal of the Society for the Study of Fertility
Ken-Go HayashiA Miyamoto

Abstract

We previously established a bovine experimental model showing that the corpus luteum (CL) does not appear following aspiration of the preovulatory follicle before the onset of LH surge. Using this model, the present study aimed to determine the profile of follicular development and the endocrinological environment in the absence of CL with variable nadir circulating progesterone (P(4)) concentrations during the oestrous cycle in cattle. Luteolysis was induced in heifers and cows and they were assigned either to have the dominant follicle aspirated (CL-absent) or ovulation induced (CL-present). Ultrasound scanning to observe the diameter of each follicle and blood collection was performed from the day of follicular aspiration or ovulation and continued for 6 days. The CL-absent cattle maintained nadir circulating P(4) throughout the experimental period and showed a similar diameter between the largest and second largest follicle, resulting in co-dominant follicles. Oestradiol (E(2)) concentrations were greater in the CL-absent cows than in the CL-present cows at day -1, day 1 and day 2 from follicular deviation. The CL-absent cows had a higher basal concentration, area under the curve (AUC), pulse amplitude and pulse frequency o...Continue Reading

References

Jul 1, 1995·Domestic Animal Endocrinology·L J Spicer, S E Echternkamp
Dec 1, 1996·Biology of Reproduction·O J GintherK Kot
Jan 3, 2001·Biology of Reproduction·O J GintherK Kot
Aug 22, 2001·Biology of Reproduction·L J KulickO J Ginther
Oct 4, 2002·Reproduction : the Official Journal of the Society for the Study of Fertility·E J AustinJ F Roche
Jun 4, 2004·Reproduction : the Official Journal of the Society for the Study of Fertility·J H HamptonH A Garverick
Feb 9, 2005·The Journal of Reproduction and Development·Tomas J AcostaAkio Miyamoto
Mar 12, 2005·Endocrinology·Tomohiro YonezawaMasugi Nishihara
Jun 1, 2005·Reproduction : the Official Journal of the Society for the Study of Fertility·Ahmet Gümen, Milo C Wiltbank
Nov 19, 2005·The Journal of Reproduction and Development·Ken-Go HayashiAkio Miyamoto
Oct 18, 2006·The Journal of Reproduction and Development·Chiho KawashimaAkio Miyamoto
Nov 30, 2006·The Journal of Reproduction and Development·Chiho KawashimaAkio Miyamoto
Jan 25, 2007·Reproduction : the Official Journal of the Society for the Study of Fertility·Chiho KawashimaAkio Miyamoto

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Citations

Nov 30, 2006·The Journal of Reproduction and Development·Chiho KawashimaAkio Miyamoto
Apr 8, 2014·Animal : an International Journal of Animal Bioscience·M C WiltbankM G Diskin

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