Table 1.

Semen concentration and motility (means ± SE) after post-thaw and selected sperm

				Motility frequencies (%)
	Bulls (n)	Concentration(×106)/Straw	Total motility	Progressive	Non progressive	Immotile
Post-thaw	1 (2)	25.71 ± 2.29	38.69 ± 5.46	29.57 ± 3.63	9.12 ± 1.83	61.31 ± 5.45
	2 (2)	24.13 ± 2.63	43.10 ± 6.20	31.10 ± 4.47	12.00 ± 1.73	56.90 ± 6.20
	3 (2)	22.37 ± 0.32	39.38 ± 1.55	30.51 ± 1.59	8.87 ± 0.04	60.62 ± 1.55
	4 (2)	30.79 ± 1.21	45.42 ± 1.37	35.82 ± 1.66	9.60 ± 0.28	54.49 ± 1.28
P values		0.160	0.682	0.367	0.321	0.475
Selected sperm	1 (2)	8.44 ± 1.35	53.34 ± 1.49	40.57 ± 1.03	12.77 ± 0.46	46.66 ± 1.49
	2 (2)	9.88 ± 0.74	77.57 ± 0.29	63.36 ± 2.14	14.24 ± 1.85	22.40 ± 0.28
	3 (2)	6.68 ± 0.39	72.85 ± 2.07	58.93 ± 2.27	13.92 ± 0.20	27.15 ± 2.07
	4 (2)	5.86 ± 0.15	62.73 ± 1.67	52.68 ± 3.26	10.05 ± 1.600	37.53 ± 1.41
P values		0.104	0.083	0.139	0.160	0.083

n; Number of straws from one freezing batch.