Table 2.

Fertility phenotypes of Holstein bulls. Bulls 1–5 are defined as high fertility (HF) and bulls 6–10, as low fertility (LF).

Bull #	Fertility status	Number of breedings	Conception rates (% difference from average)	Std of difference
1	HF	5293	5.42	2.0238
2	HF	825	5.1	1.9034
3	HF	2032	4.8	1.7931
4	HF	2487	3.59	1.3415
5	HF	5751	3.56	1.3304
6	LF	1604	−3.75	−1.4014
7	LF	2276	−4.06	−1.5159
8	LF	967	−4.49	−1.6762
9	LF	5603	−6.76	−2.5239
10	LF	674	−10.61	−3.9624