Resumption of follicular activity in the early post-partum period of dairy cows

Journal of Reproduction and Fertility
J D SavioJ F Roche

Abstract

Lactating Friesian dairy cows (2nd-4th parity) which calved in spring (N = 7) or autumn (N = 15) were used. Their ovaries were examined by ultrasound scanning and blood samples were obtained daily for progesterone and oestradiol concentrations from the 5th day after calving until the first post-partum ovulation occurred. Five autumn-calving cows selected at random were bled every 15 min over a 6-h period on 1 day each week for 4 weeks after calving to assess the patterns of LH secretion. Follicular development during the post-partum anoestrous period was characterized by the growth and regression of small (less than or equal to 4 mm) and medium-sized (5-9 mm) follicles, until a dominant follicle (greater than 10 mm) was detected. The first detected dominant follicle ovulated in 14 cows, became cystic in 4 cows (all in autumn), and failed to ovulate in 1 cow. It was not possible to detect a dominant follicle in 3 cows due to scanning difficulties. The post-partum interval to detection of the first dominant follicle (mean +/- s.d.) was shorter (P less than 0.05) in autumn (6.8 +/- 1.8 days) than in spring (20 +/- 10.1 days). However, there was no significant difference between the respective intervals to first ovulation (autumn 2...Continue Reading

Citations

May 17, 2008·Tropical Animal Health and Production·Hannah Bishop, Dirk Pfeiffer
Jun 16, 2005·The Veterinary Clinics of North America. Food Animal Practice·James D Ferguson
Jun 16, 2005·The Veterinary Clinics of North America. Food Animal Practice·Grant S Frazer
Sep 16, 2000·Theriogenology·Y Yavas, J S Walton
Sep 27, 2001·Theriogenology·F López-GatiusM López-Béjar
Jan 5, 2002·Theriogenology·M C WiltbankR Sartori
Aug 26, 2003·Theriogenology·Fabio De Rensis, Rex John Scaramuzzi
Nov 18, 2000·Animal Reproduction Science·A Y RibaduT Nakao
Feb 22, 2001·Animal Reproduction Science·S E SnijdersM P Boland
May 20, 2003·Animal Reproduction Science·I M SheldonH Dobson
Jun 24, 2003·Animal Reproduction Science·G A BóM F Martínez
Jun 24, 2003·Animal Reproduction Science·Jaswant SinghRoger A Pierson
Sep 10, 2003·Domestic Animal Endocrinology·B HeidlerC Aurich
May 1, 1997·Zentralblatt für Veterinärmedizin. Reihe A·E TorresK Nakada
Dec 3, 2010·The Journal of Reproduction and Development·Mai SatoNaoki Isobe
Mar 23, 2011·The Journal of Reproduction and Development·Minoru Sakaguchi
Oct 12, 2011·The Journal of Reproduction and Development·Mohamed M M KandielKazuyoshi Taya
May 7, 2004·Reproduction : the Official Journal of the Society for the Study of Fertility·Emma C L BleachPhilip G Knight
Jan 25, 2007·Reproduction : the Official Journal of the Society for the Study of Fertility·Chiho KawashimaAkio Miyamoto
Apr 1, 2014·Animal : an International Journal of Animal Bioscience·M A CroweE J Williams
Jun 1, 1996·The Veterinary Quarterly·G OpsomerA de Kruif

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