Table 3. Statistical results (P values) of mixed models analyses for reproductive performance.

Factors	Superovulation with AI		Ovum pickup with IVF
	Flushed embryos	Transferable embryos	Oocytes	Transferable embryos
Breeding group	0.1382	0.7739	0.3306	0.9713
Average age	0.5931	0.1204	0.4112	0.9183
Semen preparation method	0.8943	0.7060	N/A	0.5561

Note: Using the average values for reproductive performance measures, mixed model analyses were performed (Mixed procedure with REML estimation method, SAS 9.3) to test for the main effects of breeding group (genetic donor or clone). The Satterthwaite approximation for degrees of freedom was used to account for any apparent unequal variance between observational groups. The average age of the embryo donor during the evaluation period and the method of semen preparation were included as covariates, while the breed of the donor, sire identification and embryo donor identification were included as random factors in the model. The statistical analysis for oocytes generated by ovum pickup with IVF did not include semen preparation method as a covariate (N/A, not applicable). Values shown are P-values for type 3 test of fixed effects.