The incidence of multiple ovulations in Dutch warmblood mares
Willink, D.L.; Smeenk, L.A.; van Oijen, P.W.; de Kruif, A.
Tijdschrift Voor Diergeneeskunde 122(10): 277-279
1997
ISSN/ISBN: 0040-7453 PMID: 9381456 Document Number: 480241
In the period 1994-1996 1030 oestruses of Dutch Warmblood mares were evaluated on the incidence of multiple ovulations diagnosed by rectal palpation. Ultrasonography was not used. All follicles gt 25 mm were noted. The examination was repeated every 48 hours. The incidence of multiple follicle development was 7.3%. In a group of 50 ultrasonographically diagnosed twin-pregnant mares only 14 (28%) had been detected by rectal palpation as a multiple ovulation. This suggests an incidence of multiple ovulations in Dutch Warmblood mares of 7.3 times 1/28 times 100 = 26%. Restrictions of rectal palpation are discussed. Ultrasonography is essential for the diagnosis of multiple ovulations. The importance of a good twin-prevention programme is emphasized.