Abstract. Dairy cattle need high nutrient contents in their ration, especially in the first lactation
period. Farmer prefers to feed the cattle with cheap andlow quality concentrate to decrease the
feed cost. This condition leads to low milk production. This research aimed to observe the
effect of substitution of legume which contains high protein to improve the cheap low-quality
concentrate. This research uses twenty-four dairy cattle (8.5 months-pregnancy; average body
weight (BW) 359.29±35.63Kg), which were randomly divided into 3 groups of dietary
treatments. The treatment were Concentrate I (100% concentrate); Concentrate II (85%
Concentrate+15% Gliricidia sepium); Concentrate III (Concentrate 85% + 15% Arachis
pintoi). The observation was done during 16 weeks of feeding trial. The parameters observed
were feed intake and digestibility, milk production, and feed conversion ratio (FCR). Milk
production measured during 3 months-lactation periods. The result shows that concentrate
substitution by using 15% Gliricidia sepium or Arachis pintoi didn’t affect feed intake (11.017-
11.388kg DM/head/day), digestibility (56.70-58.32%), FCR(1.138-1.214 kg DM/L), and total
milk production in first 3 months-lactation period (859.07-887.59 L/head). This research
concludes concentrate can be replaced up to 15% by Gliricidia sp or Arachis Pintoi to improve
quality without affect livestock performs, but decrease feed cost