The present study was aimed to investigate the effects of body weight and scrotal circumference
on semen production traits of 136 crossbred Jersey bulls, which were maintained at three frozen
semen stations of Tamil Nadu, India. Semen production traits such as semen volume, sperm
concentration, mass activity, initial sperm motility, post-thaw motility and number of doses per
ejaculate were taken for this study. The overall mean values for semen volume (ml), sperm
concentration (millions per ml), mass activity (0 to 5 scale), initial sperm motility (per cent), postthaw
motility (per cent) and number of doses per ejaculate were 4.18 ± 0.02, 1052.80 ± 7.26, 2.09
± 0.07, 63.36 ± 0.00, 50.52 ± 0.00 and 215.50 ± 2.01 respectively. From this study, it revealed
that the body weight and scrotal circumference of bulls significantly influenced all semen production
traits except mass activity. Bulls having a body weight between 350 to 550 kg produced better quality
semen and more number of frozen semen doses per ejaculate. When the scrotal circumference
was >36 cm, majority of the semen production traits showed better values. The body weight was
positively and significantly correlated with scrotal circumference, Semen volume and number of
frozen semen doses produced per ejaculate. The scrotal circumference was positively and
significantly correlated with semen volume, mass activity and number of doses per ejaculate;
negatively and significantly correlated with initial sperm motiltiy.
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