A Single Fixed-time Insemination Prior to Ovulation Results in Higher Pregnancy Rates Than Post-ovulation Insemination When Using Frozen-thawed Semen

The negative effects on sperm longevity caused by the cryopreservation process, coupled with reduced numbers of sperm per insemination dose, place great pressure on accurate timing of AI in relation to ovulation when using frozen-thawed semen. A number of AI timing protocols have been reported, which include; AI every 24 h [1], fixed time AI (FTAI) with either a split dose [2] or entire dose [3] of frozen semen inseminated before and after ovulation, and AI within 6-12 h after ovulation [2-4][2,3,4].
Source: Journal of Equine Veterinary Science - Category: Veterinary Research Authors: Source Type: research