the percentages of cleaved embryos, morulae, and blastocysts are shown(Table 2). There was a difference (P < 0.05) between the Nellore and Jersey breeds in the percentage of oocytes that cleaved. However, there was no significant difference between breeds or temperatures in the percentage ofcleaved embryos that became morulae. Heat stress decreased (P<0.05) the percentage of cleavedembryos that became blastocysts in the Jersey breed, but had no effect in Nellore embryos. There was no significant interaction between temperature and breed for cleaved embryos, morulae, or blastocyst per cleaved embryo.
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