Relationship of efficiency indices with performance, heart rate, oxygen consump- tion, blood parameters, and estimated heat production in Nellore steers - Chaves, Amália Saturnino; Nascimento, Michele Lopes do; Tullio, R. R; Rosa, A. N; Alencar, M. M; Lanna, Dante Pazzanese Duarte (Journal of Animal Science, 2015)