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Native beef cattle breeds in Indonesia such as Bali Timor (BT), Bali Flores (BF), Madura (M), and Sumba Ongole (SO) come from different regions with different types of feed because of the different environmental ecosystems. This situation results in native cattle breeds having different microbial compositions and functions. The purpose of this study was to find native cattle breeds fed ammoniated rice straw and concentrate having the highest productivity and feed efficiency. The material used was four native beef cattle breeds with a weight of 210-250 kg and age of 3.5-3.7 years. There were ten for each native cattle and they were fed concentrate and ammoniated rice straw. The amount of concentrate fed was 2% of body weight, while ammoniated rice straw was prepared ad libitum. Randomized Block Design with an initial body weight of cattle as a group was used in this research. Covariance analysis showed that the breed of native cattle had a significant effect (P   0.05). In contrast to nutrient digestibility, ADG of SO and M cattle were higher (P   0.05), but it was high (P &lt; 0.05) compared to M and SO cattle. The conclusion is SO and M cattle have good ability when fattened using ammoniated rice straw and concentrate.

Nutrient digestibility, intake rate, and performance of Indonesian native cattle breeds fed rice straw ammoniation and concentrate