Table 1  Mean phenotypic values for parents and F1’s
PhenotypeM. m. musculusaM. m. domesticusamusculus × domesticusadomesticus × musculusa
Right testis weight (mg)57.04 ± 4.43b (25)66.36 ± 11.51c (19)49.26 ± 7.75d (23)65.59 ± 8.13c (35)
Relative right testis weight (mg/g)3.57 ± 0.30b (25)3.95 ± 0.57c (19)2.63 ± 0.38d (23)3.61 ± 0.56b,c (35)
Sperm density (millions/ml)9.33 ± 3.37e (25)12.37 ± 4.08f (17)1.77 ± 3.46g (22)12.59 ± 4.80f (33)
Seminiferous tubule area (µm2)36,362.70 ± 2,206.02b (6)34,583.45 ± 5,328.86b (6)20,751.01 ± 4,021.83c (5)28,583.69 ± 1,260.76d (6)
Proximal bent tailh0.026 ± 0.031e (10)0.042 ± 0.022e (10)0.12 ± 0.064f (10)0.032 ± 0.057e (10)
Distal bent tailh0.027 ± 0.023e (10)0.011 ± 0.012e,f (10)0.029 ± 0.022e (10)0.0030 ± 0.0048f (10)
Headless/tailless spermh0.11 ± 0.058e (10)0.072 ± 0.036e (10)0.38 ± 0.10f (10)0.089 ± 0.036e (10)
Amorphous sperm headh0.0070 ± 0.0095e (10)0.013 ± 0.013e (10)0.10 ± 0.038f (10)0.0090 ± 0.0057e (10)
Total abnormal spermh0.17 ± 0.074e (10)0.14 ± 0.052e (10)0.63 ± 0.060f (10)0.13 ± 0.049e (10)
  • a Mean ± SD. N is within parentheses.

  • b,c,d Groups significantly different by t-test, P < 0.05.

  • e,f,g Groups significantly different by Mann–Whitney U-test, P < 0.05.

  • h Proportion of abnormal sperm.