AGUSTINUS KOMI Pengarang Dr. Theresia N. I. Koni, S.Pt, M.Si Dosen Pembimbing 1 Tri anggarini Y. Foenay, S.Pt, MS Dosen Pembimbing 2 Catootjie L. Nalle, S.Pt., M.Agr. St, Ph.D Penguji 1 Helda, S.Pt., M.Si Penguji 2

This study aims to determine the weight, length and calcium and phosphorus content of the tibia bones of crossbreed native chickens which were fed ration containing suweg (Amorphophallus campanulatus BL) tuber meal. The experimental design used was Completely Randomized Design with 4 treatments and 5 replication. The treatments were P0 = rations without suweg tuber meals, P1= rations containing suweg tuber flour 5%, P2= rations containing suweg tuber meals 7.5% and P3= rations containing suweg tuber meals 10%. The tibia bone of the chicken were collected on the 8 th week. Chickens were fasted 6 hours, slaughtered and feathered. The lower thighs then dissected to collect the tibia bone. The tibia bone were cleaned from the remnants of adherent tissues by dipping in hot water at 70 o C, then measure the length and weight. Samples of tibia bones were oven dried at 60 o C for 48 hours, crushed and then analysed the calcium and phosphorus content. The results showed that the utilization of suweg tuber meals in rations have no significant (P>0.05) effect on the weight, length and calcium and phosphorus content of the tibia bones of crossbreed native chicken. However, calcium and phosphorus levels in tibia bone have significant effect (P<0.05) due to the addition of suweg tuber meals (Amorphophallus campanulatus BL). It can be concluded that the inclusion of suweg tuber meals (Amorphophallus campanulatus BL) at level 5, 7.5 and 10% in native crossbred chickens rations had no negative effect on performance. Suweg tuber (Amorphophallus campanulatus BL) can be utilized until 10% in native crossbreed chicken ration. Key words: Suweg, tibia bone, super native chicken.