ANALISIS GROSS MARGIN USAHA PETERNAKAN SAPI PERAH PADA BERBAGAI PANJANG CALVING INTERVAL

Most of small scale dairy farmers in Indonesia still have not paid attention on calving interval as the best parameter of their dairy business. The longer the calving interval would influence their cost of inputs, as well as revenue. This study was to evaluate the differences of gross margin from different performance of calving intervals at PT Naksatra Kejora Dairy Farm in Rowoseneng, Temanggung. 30 first lactation of Holstein Friesian cows were selected based on different calving intervals which they were devided into three groups, namely group 1, 2, and 3 for cows with different calving interval 12-13 months, >13-14 months, and >14-15 months respectively. The result of the study showed that gross margin per cow per year of animal in group 1, 2, and 3 were IDR 12,521,808, IDR 11,737,402.01, and IDR 10,258,385 respectively. It calculated that by one month longer of calving interval would decline gross margin per year at the amount of IDR 1,118,211.18 (10.19%) as well as decreasing IDR 10,857,350.10 (6,42%). There was decreased of gross margin per lifetime production (12 years ) as an effect of longer one month calving interval was IDR 10,857,350.10 (6.42%). It could be concluded that the longer the calving interval would reduce the gross margin income of dairy farm, with the best value has been found when calving interval was 12-13 months. (Key word : Holstein Friesian cows, calving interval, gross margin income