Prostaglandin F 2α (PGF 2α ) production possibility and its receptors expression in the early- and late-cleaved preimplantation bovine embryos

Table 1 Morula formation rates depending on the time of first cleavage

number of fertilized oocytes, n	fertilization rate, n (%)	early-cleaved embryos (30 hpi), n (%)	late-cleaved embryos (48 hpi), n (%)	morula formation rate, n (%)	morulas from early-cleaved embryos at Day 5, n (%)	morulas from late-cleaved embryos at Day 5, n (%)
1242	794	336	458	420	166	254
	(63)	(27)^a	(36)^b	(52,9)	(58)	(62,5)

Proportion of embryos cleaved at 30 and 48 h post insemination (hpi) and formation of morulas at Day 5 of in vitro culture depending on the time of the first cleavage. Percent of early- and late-cleaved embryos was presented according to the number of fertilized oocytes. Morula formation rate was calculated according to the total number of cleaved embryos. Percent of early- and late- cleaved morulas was presented in relation to the total number of embryos cleaved at 30 and 48 hpi, respectively
^a,b Differences between cleavage rates (P < 0.0001)
P values of cleavage rate determined by Chi-square test with Yates’ correction

ISSN: 1746-6148