Abstract
This study constitutes an experimental reproduction of Black Belly sheep in order to investigate the Bluetongue disease or catarrhal fever. A total of 32 multiparous Black Belly ewes were superovulated with porcine FSH during the last three days of progestagen treatment, which lasted 14 days. Embryos were surgically collected six days after intrauterine insemination. A total of 264 transferable embryos were recovered (8,2 ± 6,0/donor), of which 232 were transferred to 111 synchronized females (88 multiparous Romane and 23 nulliparous Suffolk receptor ewes). Lambing and embryo survival rates were 83,6% and 63%, respectively. Both results were significantly higher in multiparous Romane than in nulliparous Suffolk receptors. The number of ovulations and embryos transferred per recipient, as well as their stage of development had a significant effect on embryo survival rate. The best lambing and embryo survival rates were obtained from recipients with more than two ovulations and that had received two embryos in the blastocyst stage.
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