Table 2.

Sperm quality traits in young, adult, and aged Nellore bulls evaluated after cryopreservation (means ± SD)

Group	High mitochondrial potential	Intact membrane/Acrosome	Damaged membrane	Damaged acrosome	Morphologic defects
Young	81.70 ± 9.40ª	54.70 ± 9.49ª	34.70 ± 12.27b	32.52 ± 8.75c	18.78 ± 7.02a
Adult	67.82 ± 10.38b	46.68 ± 10.13b	38.81 ± 9.76ab	38.23 ± 11.52b	14.62 ± 7.80b
Aged	65.31 ± 12.12b	37.53 ± 9.84c	41.76 ± 10.67a	45.85 ± 13.72a	15.14 ± 6.37ab

Means with different superscripts same column differ significantly (p < 0.05) by the Duncan test