Ovulation rate and distribution in the thoroughbred mare, as determined by ultrasonic scanning: the effect of age

Animal Reproduction Science
M C Davies Morel, J A O'Sullivan

Abstract

Ovarian activity was monitored in 2181 oestrous cycles from 1136 thoroughbred brood mares to accurately determine overall ovulation rate, the relative distribution of ovulations between left and right ovary, whether mare age had an effect on these parameters and whether ovulation pattern in one cycle affected the pattern within the next. Ultrasonic scanning was used in preference to rectal palpation and slaughterhouse material due to its greater accuracy. Mare's ages ranged from 3 to 22 years. The results obtained indicated a similar incidence of ovulation occurring on the right (49.5% of all ovulations) or left ovary (50.5%). Multiple ovulations (MO) occurred in 22.4% of oestrous cycles. Significantly (P<0.01), more double ovulations (DO) were bilateral (57.2%) than unilateral (42.8%); 20.7% were unilateral right and 22.1% were unilateral left. There were 828 mares grouped into six age groups: A (3-5 years), B (6-8 years), C (9-11 years), D (12-14 years), E (15-18 years), F (18-22 years). The distribution of ovulation between the left and right ovary was not affected by age group, but significant association (P<0.01) was evident between age and MO. Group A had 15% of cycles resulting in MO compared to 19.4, 24.6, 25.8, 28.6 an...Continue Reading

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Citations

Mar 6, 2010·The Journal of Veterinary Medical Science·Young Ki KimSeong Chan Yeon
Oct 1, 2009·Reproduction in Domestic Animals = Zuchthygiene·S SharmaD Dadarwal
May 19, 2006·Journal of Animal Breeding and Genetics = Zeitschrift Für Tierzüchtung Und Züchtungsbiologie·A WolcT Szwaczkowski
Oct 18, 2011·The Veterinary Journal·M C G Davies MorelM Lauber
Jan 27, 2015·The Veterinary Record·M C G Davies MorelN Reynolds
Nov 8, 2018·The Journal of Endocrinology·Renata C UlianiMarco A Alvarenga
Aug 22, 2007·Ecological Applications : a Publication of the Ecological Society of America·Daniel M KashianClaudia M Regan
Sep 22, 2006·Equine Veterinary Journal·T A E Stout
Oct 30, 2020·Animals : an Open Access Journal From MDPI·J DoradoM Hidalgo
Jul 6, 2021·Journal of Equine Science·Jeffrey A FawcettFumio Sato

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