Table 3.

Fertility of different bulls expressed as NRR or CNRR

Bulls	n	Fertility
		NRR (%)	CNRR (%)
1	22	81.8	98.5
2	27	51.9	57.8
3	29	62.1	67.2
4	32	78.1	82.3
P values		0.067	0.018

n; Number of artificial insemination performed per bull, NRR; Non return rate- 56 days, and CNRR; Corrected non return rate-56 days.