Abstract
Abstract In vitro trials on the survival of sperm stored fresh or rediluted after freezing showed quite significant differences in the total survival time of sperm incubated at 37°C. Even after adjusting for different sperm concentrations, survival was still superior in the fresh compared with rediluted frozen sperm (124 ± 5.5 h vs. 75.8 ± 3.1 h). There was no significant difference in fertility between rediluted frozen sperm (RDF) and fresh sperm, both stored in Caprogen, when the insemination dose was 20 × 106 and 2.5 × 106 sperm, respectively. Reduction of the sperm concentration in the insemination dose from 20 × 106 to 5 × 106 sperm in RDF and from 2.5 × 106 to 0.5 × 106 sperm in fresh semen reduced non return rates by 7.9% and 7% respectively (P
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