Abstract

Reduced behavioral signs and intensive management complicates oestrus detection in dairy cows. Hence, a score card incorporating more secondary signs was prepared, comprising sheet A and B for external findings and internal changes respectively. Based on ultrasonographic verification, animals getting at least score 20 (in sheet A) were indicated for internal examination and a cumulative score of at least 50 (sheets A&B) were ready for insemination. The score card was validated for oestrus intensity assessment in 60 postpartum (PP)cows (Gr. 1), closely watched for minor signs of oestrus followed by clinico gynecological examinationand 22 cows (Gr 2) under routine management formed the control group. Against 50.00 % in Gr. 2, 71.67 %cows of Gr. 1were detected in oestrus, including 9 animals reported twice, achieving oestrus detection rate (ODR) of 86.67 %. Despite non-significant variation ofAI success (60.42 versus 55.56 %) between Gr. 1 and 2, animals conceived during the study period was 48.33% and 22.73% respectively (P<.05), producing major enhancement of reproductive performance. Thus, the new score card for oestrus detection and insemination placing more focus on secondary changes will be highly promising to enhance oestrus detection and herd fertility under intensive management.

Keywords : Oestrus detection, Score card, Behavioral sign, Insemination, cross-bred cattle