Made available in DSpace on 2020-12-12T01:05:32Z (GMT). No. of bitstreams: 0 Previous issue date: 2019-01-01; Production performance and methane production in two breeding and finishing systems in the state of Rondônia, Brazil, are evaluated. Study comprised totally randomized design, with two treatments, with 128 non-castrated heifers, mean initial weight 281.906 ± 1.69 kg. Production systems were classified b...