PERFORMANCE OF ARTIFICIAL INSEMINATION THROUGH LIQUID AND FROZEN-THAWED SEMEN ON DAIRY CATTLE REPRODUCTION

Abstract

The aim of this study was to investigate the performance of artificial insemination on conception rate in the dairy cattle available in Dinajpur, Thakurgaon and Panchagarh districts and to evaluate the repeat breeding rate after artificial insemination by liquid and frozenthawed semen and also to study the calf production using liquid and frozen-thawed semen. The present study was conducted from January-June/2014. The experimental data related with the artificial insemination in Dinajpur, Thakurgaon and Panchagarh districts were collected from District Artificial Insemination Centre, greater Dinajpur. The yearly target of artificial insemination by liquid semen was higher (P<0.05) in the Dinajpur District during all fiscal years. However, in 1% and 2™ fiscal years, it was significantly higher in Dinajpur District than other two districts Thakurgaon and Panchagarh). The first breeding by liquid semen was highest in the Dinajpur District during 1° to 4 fiscal years and then decreased by Thakurgaon District in 5" fiscal year. The yearly target acquired by liquid semen was higher in the Thakurgaon District (181%) during 1* fiscal year and then remain consistent with Dinajpur and Panchagarh districts from 2™ to 5" fiscal years. Similarly, in case of frozen-thawed semen, it was higher in the Panchagarh District (99%) at 1 fiscal year and then remains consistent with Dinajpur and Thakurgaon districts from 2™ to 5" fiscal years. The repeat breeding rate by liquid semen was higher in the Dinajpur District during 1* to 4" fiscal years and then decreased in 5" fiscal year. But it was higher in Panchagarh District (15.0%) in 5" fiscal year. The repeat breeding rate by frozen-thawed semen was higher (P>0.05) in the Panchagarh District during all fiscal years. The pregnancy number after artificial insemination with liquid semen was higher (P<0.05) in the Dinajpur District during 1* to 4" fiscal years and remain similar with Thakurgaon in 5" fiscal year. The conception rate was higher in Panchagarh District in 4" and 5" fiscal years. The conception rate in this district was increasing year by year. On the other hand, the conception rates achieved by frozen-thawed semen were almost similar during Ist to 4" fiscal years, but differed in 5™ fiscal year. In 5" fiscal year, the conception rate achieved by using frozenthawed semen in Panchagarh District was higher (55%) than that of Dinajpur and Thakurgaon districts. The male calf production by liquid semen was almost similar in the Dinajpur and Thakurgaon districts during all fiscal years. However, the male calf production by frozen-thawed semen was higher in the Dinajpur District than Thakurgaon and Panchagarh districts during all fiscal years. Female calf production by liquid semen was almost similar in the Dinajpur and Thakurgaon districts during all fiscal years.