Abstract
In each of two experiments, heifers were assigned to a control group and a unilaterally ablated (UA) group (n = 6/group). In the UA group, follicles ≥ 4 mm in the left ovary were ablated by transvaginal ultrasound-guided technique at Hour 0 (8:00 AM) on the day of ovulation. Follicles in the CL-bearing right ovary remained intact. In Experiment 1, ablations continued until the next ovulation, and new follicles emerged in the right ovary in 9 of 14 (64%) waves. The number of follicles/wave (combined, 6.4 ± 0.4) did not differ between groups. In Experiment 2, follicles were counted at Hours 0, 4, 8, 12, and 24; the resistance index (RI) for blood flow in the ovarian pedicle was determined at Hours 0 and 12; and blood samples were collected every hour from Hours 0 to 12 and at Hour 24. An increase (P < 0.05) in the number of follicles in the follicle-intact ovary began at Hour 4 with complete compensation by Hour 24. Concentrations of FSH did not change between Hours 0 and 24 in the UA group but decreased (P < 0.05) in the controls by Hour 7. At Hour 12, RI to the right ovary approached being lower (P < 0.06) in the UA group than in the control group. Results indicated that unilateral ablation of follicles ≥ 4 mm led to compensato...Continue Reading
References
Nov 1, 1975·Biology of Reproduction·G D NiswenderM A Diekman
Jan 1, 1992·Journal of Reproduction and Fertility·G P AdamsO J Ginther
Jun 1, 1970·Biology of Reproduction·S SaiduddinL E Casida
Aug 1, 1984·Biology of Reproduction·D A RedmerB N Day
Sep 1, 1994·Journal of Reproduction and Fertility·J G LussierT D Carruthers
Jul 1, 1997·Domestic Animal Endocrinology·H KanekoY Hasegawa
Nov 22, 1997·Biology of Reproduction·J R GibbonsO J Ginther
Mar 25, 2000·Theriogenology·M Mohan, R Rajamahendran
Jul 25, 2000·Biology of Reproduction·O J GintherK Kot
Jul 24, 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·O J GintherK Kot
May 30, 2003·Reproduction : the Official Journal of the Society for the Study of Fertility·M A BegO J Ginther
Nov 1, 1994·Theriogenology·D R BerfeltG P Adams
Jul 1, 1997·Theriogenology·O J GintherM C Wiltbank
Nov 6, 2007·Theriogenology·G P AdamsP Malhi
Nov 30, 2007·Biology of Reproduction·R DuggavathiN C Rawlings
Jan 6, 2009·American Journal of Veterinary Research·Reno R Araujo, O J Ginther
Mar 7, 2009·Biology of Reproduction·Reno R AraujoMilo C Wiltbank
Jun 17, 2009·Reproduction : the Official Journal of the Society for the Study of Fertility·M P PalhaoO J Ginther
Dec 25, 2009·Reproduction : the Official Journal of the Society for the Study of Fertility·H K ShresthaO J Ginther
Aug 17, 2010·Theriogenology·M A HannanO J Ginther