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The experiment was carried out with the objective of evaluating the gross margin, the productive and reproductive performance of beef heifers kept exclusively on ryegrass pasture (Lolium multiflorum Lam.) or ryegrass receiving 0.5 and 1.0% of body weight (BW) of whole rice bran as supplement. The grazing method was the rotational and the interval between grazings was set by the thermal sum required for the appearing of 1.5 ryegrass leaf (187.5oC). The experimental design was completely randomized with repeated measures. Heifers average daily gain did not differ between the feeding systems. The stocking rate and weight gain per area were higher when heifers received 1.0% BW of whole rice bran. The higher gross margin was observed when heifers received 0.5% BW. The variable cost obtained for the different feeding systems showed increasing behavior depending on the WRB levels, surpassing the exclusive use of ryegrass in 49.4% and 81.8%. The final body weight, body condition score and reproductive tract score did not differ between the feeding systems. Considering an adult animal with an average body weight of 450kg, the heifers at the beginning of the experiment showed 34% of mature body weight and final average body weight of 56% of adult weight. The use of rice bran levels (FAZ) in the rearing of beef Recebido em 13 de junho de 2017 Aceito em 2 de julho de 2018 E-mail: luiz.zoot@gmail.com

Análise bioeconômica do farelo de arroz na recria de bezerras de corte em azevém