Long-term follicular dynamics and biochemical characteristics of dominant follicles in dairy cows subjected to acute heat stress

Animal Reproduction Science
A GuzelogluW W Thatcher

Abstract

The objective of this study was to examine the quality of successive dominant follicles (DFs) after induced heat stress. Non-lactating dairy cows expressing estrus at normal intervals were allocated randomly to heat stress (HS; n=8) and control (C; n=8) groups. Cows received GnRH (100 microg, i.m.) on Day 0, a progesterone CIDR-B device on Day 4 and prostaglandin (PGF(2alpha); 25mg, i.m.) on Day 7 upon removal of the CIDR device. The DF and follicles >5mm were aspirated on Day 8, and GnRH (100 microg) injected following aspiration, to initiate a new follicular wave. In this manner, a DF was aspirated every 8 days (one "follicular cycle") for 10 cycles. After the first follicular cycle, HS cows were placed in environmental chambers for 7 days during the second follicular cycle (8h per day at 43.3 degrees C set point and 16h per day at 24 degrees C for 4 days, and 8h per day at 43.3 degrees C set point and 16h per day at 32.2 degrees C set point for 3 days; relative humidity, 40%) and thereafter maintained outdoors with control cows at a mean ambient temperature (18.5 degrees C; range 12.7-26 degrees C). Rectal temperature increased (P<0.001) in HS as compared with C cows (39.28+/-0.01 degrees C versus 38.78+/-0.01 degrees C). Co...Continue Reading

References

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Citations

Dec 29, 2010·Cell Stress & Chaperones·Alexander V Sirotkin, Miroslav Bauer
Aug 26, 2003·Theriogenology·Fabio De Rensis, Rex John Scaramuzzi
Jun 14, 2000·Animal Reproduction Science·D WolfensonR Meidan
Apr 1, 2008·Animal : an International Journal of Animal Bioscience·F De RensisR J Scaramuzzi
Aug 14, 2013·Research in Veterinary Science·Melisa M L VelázquezHugo H Ortega
May 23, 2015·The Journal of Reproduction and Development·Ryosuke SakumotoKosuke Iga
Oct 18, 2012·International Journal of Hyperthermia : the Official Journal of European Society for Hyperthermic Oncology, North American Hyperthermia Group·Johnny AwwadChantal Farra
Mar 16, 2006·Journal of Dairy Science·R J CollierM J VanBaale
Jul 2, 2017·Molecular Reproduction and Development·Jason W RossLance H Baumgard
Jul 6, 2020·Reproduction in Domestic Animals = Zuchthygiene·Zvi Roth
Feb 16, 2019·Molecular Reproduction and Development·Raffaele Boni
Nov 8, 2017·Reproduction in Domestic Animals = Zuchthygiene·O AarifA A Sheikh
May 24, 2005·Reproduction, Fertility, and Development·Ma YuanZhang Yong-Xiang
Aug 13, 2011·Reproductive Medicine and Biology·Masashi Takahashi
Aug 28, 2021·Animals : an Open Access Journal From MDPI·Isfendiyar DarbazSelim Aslan

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