Abstract:
This study aims to analyze the pregnancy rate resulting from artificial insemination of
Bali cattle with different semen depositions. The research method used was a field experiment with three treatments: semen deposition at positions 3, 4, and 4+ (right
side/dexter side). Pregnancy rate data were evaluated through Non-Return Rate (NRR1
and NRR2), Service per Conception (S/C), and Conception Rate (CR). The study was
conducted on 120 Bali cattle in Bulukumba District, South Sulawesi. The results showed
an increase in NRR in semen deposition 3, 4, and 4+ during the observation period of
NRR 31 – 60. Although some breeders reported arousal symptoms late, the increase in
NRR indicates a good understanding of arousal detection. Semen deposition at position
3 produces the lowest NRR, which can be caused by reproductive function abnormalities, silent heat, endometritis, or late reporting by farmers. The results of the S/C evaluation showed the lowest value and the highest of CR at semen deposition 4, which
means that the semen deposition was closer to the fertilization site. Semen deposition
at positions 4+ on dexter side althrough closer to the fertilization site was lower results
of CR than posisition 4, because sperma only toward in right tubafolopii. The effectiveness of AI is significantly impacted by accurately detecting and timing the insemination
process based on the ovulation period. This study provides important information regarding AI techniques in Bali cattle that can be used to increase the population and genetic
quality of beef cattle in Indonesia.
