Table 2.

Heritabilities for commonly measured semen production traits

Traits	n	Estimate	Standard error	Breed	Source
Scrotal circumference, 6 months	2,424	0.41	0.08	Tropical Composite	Corbet et al. (2013)
Scrotal circumference, 12 months	717	0.36	0.06	Angus	Knights et al. (1984)
	4,233	0.53	0.06	Hereford	Bourdon and Brinks (1986)
	549	0.40	0.09	Hereford, Angus, & Red Angus	Smith et al. (1989)
	1,282	0.56	*	Angus	Christmas et al. (2001)
	1,281	0.46	0.08	Angus	Garmyn et al. (2011)
	2,424	0.46	0.09	Tropical Composite	Corbet et al. (2013)
Scrotal circumference, 18 months	—	0.40	0.02	Nellore	Silva et al. (2011)
	2,424	0.43	0.09	Tropical Composite	Corbet et al. (2013)
Scrotal circumference, 24 months	2,424	0.44	0.09	Tropical Composite	Corbet et al. (2013)
Volume	2,351	0.18	*	Holstein	Taylor et al. (1985)
	2,387	0.65	0.09	Normande	Ducrocq and Humblot (1995)
	198	0.24	*	Holstein	Mathevon et al. (1998)
	955	0.04	0.54	Simmental	Kaps et al. (2000)
	841	0.09	0.08	Line 1 Hereford	Kealey et al. (2006)
	974	0.22	0.03	Lacaune Rams	David et al. (2006)
	301	0.18	0.02	Beef/ Dairy Cross	Gredler et al. (2007)
	515	0.22	0.05	Holstein	Druet et al. (2009)
	1,212	0.26	0.06	Holstein	Suchocki and Syzda (2015
	787	0.20	0.04	Beef & Dairy	Berry et al. (2019)
Sperm concentration	717	0.13	0.06	Angus	Knights et al. (1984)
	2,387	0.39	0.10	Normande	Ducrocq and Humblot (1995)
	198	0.52	*	Holstein	Mathevon et al. (1998)
	955	0.26	0.01	Simmental	Kaps et al. (2000)
	841	0.16	0.08	Line 1 Hereford	Kealey et al. (2006)
	974	0.24	0.04	Lacaune Rams	David et al. (2006)
	301	0.14	0.04	Beef/Dairy Cross	Gredler et al. (2007)
	1,212	0.34	0.07	Holstein	Suchocki and Syzda, 2015
	787	0.20	0.07	Beef & Dairy	Berry et al. (2019)
Number of spermatozoa	717	0.24	0.05	Angus	Knights et al. (1984)
	2,351	0.03	*	Holstein	Taylor et al. (1985)
	198	0.38	*	Holstein	Mathevon et al. (1998)
	974	0.18	0.03	Lacaune Rams	David et al. (2006)
	301	0.22	0.02	Beef/Dairy Cross	Gredler et al. (2007)
	1,212	0.27	0.06	Holstein	Suchocki and Syzda (2015)
	787	0.38	0.05	Beef & Dairy	Berry et al. (2019)

*No standard error reported; n = number of bulls.