This research was conducted to study the effect of 3% outdated milk powder supplementation in commercial concentrates on reproduction performance of early lactation dairy cattle. This research was located in Murten Farmer Group, Sleman Regency, Daerah Istimewa Yogyakarta. Eight early lactation Friesian Holstein Crossbred (PFH) were divided into two groups. Four animal were used as a control (without supplement addition) and another group as treatment object (with supplement addition). The animals fed with both commercial concentrates form Warga Mulya and forages (King grass). Outdated milk powder supplement was added at level 3% of total concentrates for each individual animal in treatment group. Drinking water was provided ad libitum. The variable measured consisted of post partum mating (PPM), service per conception (S/C) and days open (DO). The comparison results between the two condition (control and treatment) were tested using T-test analysis. The results indicated that post partum mating (99.75±21.45 vs. 88.00±9.27 day), service per conception (1.25±0,50 vs. 1.00±0.00) and days open (126.75±41.69 vs. 88.00±9.27 day) between controls and treatments were not significant (P>0.05). In conclusion, the supplementation of 3% outdated milk powder in commercial concentrates in the ration have no significant effect on reproduction performance of PFH dairy cattle. INTRODUCTION Dairy cattle need high quantity nutrients in their feed during lactation period, especially during early lactation period, i.e. approximately 3 to 7 times as much compared to during the dry physiological condition. If the feed intake provided is insufficient, either in terms of quantity or quality, then the cattle will utilize the nutrients available within its body by mobilizing the stored energy within their bodily tissues. As the consequence of this mobilization, the cattle will lose so much weight, which will affect the cattle's production and reproduction performance (Mundingsari, 2006). The farmers' ability in Indonesian as the subject is essential in managing the dairy farm to obtain the ideal birth interval. To increase milk production and to achieve the optimal results, obtaining dairy cattle with high genetic factors, other factors such as good environment, good management (of feed, care, and climate), as well as good organization are also needed. Feed quality and management in terms of improving efficiency and efficacy to stimulate better cattle productiveness need to be examined because feed costs are the biggest expense in the management of dairy cattle.
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