Table 1.

Yolk sac diameter, embryonic size and embryonic scores in embryos following 28 h of culture in 90% rat serum and in DMEM/F12 supplemented with 20% FBS. Values are mean ± SD with number of live embros examined for each parameter in parentheses

	Embryos cultured on DMEM/F12 and 20% FBS	Embryos cultured on rat serum
Embryonic C-R length (mm) at start of exp.	1.66 ± 0.19 (32)*	1.66 ± 0.19 (32)*
Embryonic CR length (mm) at end of exp.	4.22 ± 0.58 † (67)	3.97 ± 0.42 (49)
Yolk sac diameter (mm) at start of exp.	4.62 ± 0.06 (32)*	4.62 ± 0.06 (32)*
Yolk sac diameter (mm) at end of exp.	5.72 ± 1.01 (67)	5.66 ± 1.14 (49)
Embryonic score at the end of exp.	40.17 ± 12.23† (67)	39.05 ± 20.28 (49)
Embryonic anomalies	4/67 (5.97%)	3/50 (6.00%)

^*These embryos were not cultured.

^†Significantly different from embryos cultured on rat serum: P < 0.05.