Abstract
Fifty-three fat Japanese black beef cattles force-fed after calving were superovulated with porcine follicle stimulating hormone (FSH-P). Numbers of recovered embryos and transferrable embryos increased following treatment with 15 mg of FSH as compared to 28 mg [9.9 ± 6.1 (mean ± SD) and 7.8 ± 5.2 vs. 6.0 ±3.6 and 2.8 ± 2.1, respectivefly]. The ratio of transferrable embryos to recovered ova and embryos was significantly higher (p < 0.05) in cattles treated with 15 mg of FSH (79%, 94/119) than in cattle with 28 mg (46%, 113/246). However, percentages of cattles with no recovered embryos and non-transferrable embryos were 17%(7/41) and 32%(13/41), respectively, when treated with 28 mg of FSH. Transferrable embryos were recovered from all cattles treated with 15 mg of FSH. These results indicate that the low dosage of FSH is useful for superovulation in fat Japanese black donors.
