[The incidence of multiple ovulations in Dutch warmblood mares].
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 > 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 x 1/28 x 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.
Willink
D L
DL
Veterinair Centrum Someren.
Smeenk
L A
LA
van Oijen
P W
PW
de Kruif
A
A
D000818:Animals; D005260:Female; D006736:Horses / Q000502:physiology*; D015994:Incidence; D010061:Ovulation Detection / Q000379:methods / Q000662:veterinary*; D013480:Superovulation / Q000502:physiology*