Effects of Photoperiod on Epididymal and Sperm Morphology in a Wild Rodent, the Viscacha (Lagostomus maximus maximus)

Table 2

Abnormal morphology rates (%) of viscacha spermatozoa during periods of activity and regression.

	Activity	Regression
Number of samples	5	5
Sperm parameters
Concentration	485 ± 13.5 × 10^6	72 ± 8.5 × 10^6
Morphology			P
Normal	93.2 ± 0.46	65.2 ± 0.32	<0.001
Abnormal	7.8 ± 0.004	33.8 ± 0.004	<0.001
Head defects
Pyriform	1.96 ± 0.004	0.75 ± 0.004	<0.001
Round	0.98 ± 0.003	6.76 ± 0.003	<0.001
Tapered	2.94 ± 0.004	4.51 ± 0.004	<0.001
Amorphous	—	5.26 ± 0.01
Neck and midpiece defects
Asymmetrical	—	4.51 ± 0.004
Thick insertion	—	9.77 ± 0.008
Tail defects
Bent	0.98 ± 0.004	—
Coiled	0.98 ± 0.004	1.5 ± 0.01	<0.001
Excess residual cytoplasm
>one-third head	—	0.75 ± 0.005

The values are expressed as mean ± SEM. The significant differences were determinated by student’s t-test.