Table 1 Groups of young, adult and aged Nellore bulls with number of evaluated samples (27, 59 and 36, respectively), scrotal circumference and computer assisted sperm analysis after cryopreservation (means ± SD)

1.9 ± 0.1

38.17 ± 3.50 ^a

67.80 ± 17.68^a

36.93 ± 11.28^a

74.85 ± 12.53^b

53.41 ± 10.23^b

144.82 ± 25.48^b

4.8 ± 1.0

41.14 ± 2.19 ^b

39.83 ± 13.52^b

23.13 ± 8.65

85.80 ± 12.23^a

68.13 ± 10.89^a

160.44 ± 23.10^a

10.1 ± 2.0

40.13 ± 2.89 ^b

37.99 ± 17.75^b

22.12  ± 11.64^b

82.93 ± 13.29^a

65.59 ± 12.84^a

155.66 ± 24.37^ab