Table 8.

Semen quality parameters of young and old bulls during regular and irregular sperm donation (mean ± SD).

Parameters	Regular semen donation		LSD R/I Y	Irregular semen donation		LSD R/I O
	Young	Old		Young	Old
Volume (mL)	4.2 ± 2.1	6.5 ± 3.2		3.9 ± 2.2	5.7 ± 3.1
Concentration (× 106/mm3)	1774 ± 221.6A	2831 ± 604.9B	**	1905 ± 373.62A	3004 ± 825.25B	**
Live (%)	83.52 ± 3.70	84.45 ± 4.53	*	76.83 ± 3.99	75.97 ± 5.12	*
Dead (%)	10.03 ± 1.11	9.90 ± 1.19	*	11.10 ± 2.72	11.75 ± 3.57	*
Total motility (%)	78.28 ± 5.36	80.02 ± 5.03	*	73.51 ± 6.79	75.25 ± 4.04	*
Progressive movement (%)	46.67 ± 0.88	51.16 ± 1.96	*	41.32 ± 1.23	44.19 ± 2.91	**
Mass motility	++	+++		++	++

Explanation: Values with different letters (a, b) differ significantly between columns at P < 0.05, *P < 0.05; **P < 0.01.