The regularity of cycles and ovarian efficiency in a group of Friesland cows

Maree, C.

Journal of the South African Veterinary Association 48(2): 133-135

1977


ISSN/ISBN: 1019-9128
PMID: 915891
Document Number: 118764
Delayed ovulation was recorded in 17,34% and anovulation in 17,66% of 623 oestrus periods in 32 Friesland cows. Cycle length was abnormal in 19,19% of 568 cycles and was associated with an increase in the incidence of defective ovulation. Inseminations failed in 24,6% of cases despite normal ovulatory function at oestrus while in nine out of 134 inseminations sperm retained its fertilizing capacity in the female tract between 24 and 72 hours.

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