Effect of extenders, post-dilution intervals and seasons on semen quality in dairy goats.

The breeding of female dairy goats with good quality sires has been a problem in rural areas and artificial insemination (AI)provides an answer to this issue. To develop an AI model, a total of 9 bucks were purchased from a local market. Semen was collectedin an artificial vagina, the libido was noted, and the semen was evaluated for its physical characteristics. The libido, semen volume, massmotility, individual motility, and sperm concentration were 2.94 ± 0.25 (scale of 1â€Â'3), 0.79 ± 0.59 mL, 4.34 ± 0.93 (scale of 1â€Â'5), 55.01 ±32.59%, and 1027 ± 406 million spermatozoa/mL, respectively. The buck affected various quality parameters (P < 0.05) except individualmotility, which may be confounded by the time interval. The libido declined during June and the mass motility declined from Novemberto January. The individual motility remained higher during March and July to October. The volume was the highest during January andthe sperm concentrations were the highest during November. No difference was found in the sperm motility up to 2 h after dilution.Between 6 and 192 h, the sperm motility decreased significantly from 56.43% to 10.71%. The extender containing 20% egg yolk and 7%glycerol (control) maintained sperm motility for more than 192 h (72.33%). The time of collection correlated with the semen volumesignificantly (r = â€Â'0.237, P = 0.000). The semen volume correlated positively with the libido and negatively with the mass motilityand concentration. The concentration correlated positively with the time of collection and the mass motility. The individual and massmotility correlated positively with each other.