Effects of highly purified porcine FSH preparation for superovulation in cattle

The embryo production in cattle by superovulation treatment with the highly purified porcine FSH preparation containing reduced LH activity (FSH-R, Denka Pharm.) and with the commercially available crude porcine FSH preparation (FSH-P, Denka Pharm.) were compared. Twenty-four Holstein cows were treated with 36AU of FSH-P or FSH-R and PGF2α in decreasing method. At 6, 7 or 8 days after estrus and insemination, all cows were slaughtered and their ovaries were observed visually (12, FSH-P group; 12, FSH-R group), and 21 cows were flushed and ova/embryos recovered (11, FSH-P group; 10, FSH-R group). On the results, the mean number (+SD) of corpora lutea and total ova/embryos were not different between FSH-P group and FSH-R group (14.2±10.6 vs 14.7±7.4, 9.1±8.2 vs 10.7±6.8, respectively), however, the fertilized ratio and normal ratio were different significantly (86.0% vs 94.4%, P