Time Exposure Period of Bovine Oocytes to Sperm in Relation to Embryo Development Rate and Quality

Table 2

Effect of different gamete coincubation intervals (mean ± SEM) on blastocysts development, hatched blastocysts, and total number of embryonic nuclei.

Coincubation interval (h)	Oocytes (𝑛)	Blastocysts∗Day 8 (%)	Hatched Blastocysts∗Day 9 (%)	Nº of embryonic nuclei (𝑛=30/per Group)
T 3	362	25.6±2.8	23.4±3.2	128.2±4.5^a
T 6	358	24.2±3.3	24.0±4.3	112.2±6.1^b
T 18	350	28.4±4.2	25.9±3.8	111.0±5.7^b

^a,bWithin columns, values with no common superscript are different (𝑃<.05). ∗The proportion of blastocysts and hatched blastocysts were estimated by dividing the total number of blastocysts and hatched blastocysts by the total number of oocytes and blastocysts respectively among intervals of time.