Abstract. The study was conducted to measure digestibility of dry matter and organic
matter in Holstein Friesian cow ration which was supplemented with Leucaena
Leucocephala leaves. The experiment was designed followed completely randomized
design, consisted of 3 treatments, namely P0, P1 and P2 with 4 replications. Treatment P0
was basal ration, composed of 35% forage + 65% concentrate of total dry matter.
Treatment P1 and P2 contained basal ration supplemented by Leucaena Leucocephala
leaves as much as 10% and 20% of total forage dry matter, respectively. The data on dry
matter, organic matter digestibility and nutrient consumption were collected during 14
days. The results showed no significant different of dry matter, organic matter, crude fibre
digestibility among rations. Dry matter, organic matter, crude protein, and crude fibre of
ration P1 and P2 were higher than P0. In conclusion, there was no effect of Leucaena
Leucocephala leaves supplementation on dry matter and organic matter digestibility of
ration but increased the consumption of dry matter, organic matter, crude protein and
crude fiber