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Semen production performance of Sahiwal bulls

2005; Indian Council of Agricultural Research; Volume: 75; Issue: 1 Linguagem: Inglês

2394-3327

Dilip Kumar Mandal, S. Tyagi, Arvind Mathur,

Livestock Management and Performance Improvement

Semen characteristics of Sahiwal bulls (5 young; l g0.13, 1335.25p51.00, 2.66p0.07. 52.71p1.31, 70.40p3.91, 4.50hp1.37, 6.80p1.82, 7.10p1.26 and 18.40p3.03 respectively. Effects of age on semen characteristics and frozen semen doses production of Sahiwal bulls were significant. In adult bulls, the semen volume, mass activity, initial motility and post-thaw motility was 125.37, 10.63,28.77 and 12.86% higher as compared to young bulls. Number of frozen semen doses produced per ejaculate were 61.90% higher in adults as compared to young bulls. Effect of seasons was significant both on semen quality and production performance. Initial and post-thaw motility were highest during winter (60.28p3.58 and 49.64p2.06% respectively) and lowest during rainy (49.03p2.56 and 37.97p2.56% respectively) seasons. During winter average number of frozen semen doses produced per ejaculate were 47.79 and 96.30% higher as compared to summer and rainy season respectively. Effect of age on rejection rate of ejaculates was significant. On overall basis 77.16% ejaculates in Sahiwal bulls were rejected from frozen semen doses production. In young and adult bulls 9.26 and 39.32% ejaculates, respectively, were frozen successfully (having post-thaw motility =50%).Effects of seasons on rejection rates were significant. It was the highest during rainy season (83.33%), followed by summer (76.79%)and winter (42.86%). The best period for harvesting of semen doses from Sahiwal bulls was winter followed by summer. For obtaining large number of doses mature (>3 years) Sahiwal bulls might be preferred over young bulls.