The purpose ofthis study was to evaluate the effect of the inclusion of roasted whole soybean(RWS) in the concentrate composition to be employed to supplement feeding ofHolstein cows on coastcross-1 pasture. Twelve early-lactating cows wereutilized, divided into two groups as follows: A) the ones fed standard concentrate(control) containing soybean meal (23.5% CP and 80% TDN) and B) the ones fedRWS-enriched concentrate (19.5% CP and 86% TDN). In two treatments, daily feedingwas of 9 kg/cow of concentrate. An electric fence was utilized for helping pasturemanagement, which was based on rotational grazing, with one day of paddock occupationand a resting period of 25 days. The experiment lasted 100 days, during thesummer, when the pasture was fertilized with 140, 32, and 112 kg/ha of, respectively,N, P2O5 and K2O, divided into four applications.The inclusion of RWS caused an increase in milk production and in fat-corrected(to 3.5%) milk production, which were, in average: 22.2 and 23.6 and 19.8 and19.7 kg/cow/day, for RWS-enriched and control treatments, respectively. Themilk fat levels were 4.16 and 3.49% in the plots, where animals were fed, respectively,RWS-enriched and standard concentrate. The cows fed RWS-enriched concentrateexhibited superior milk production than the ones fed standard concentrate, reaching145.4 kg milk/ha/day. In both treatments the cows showed weight gains.
