Vilela et al., 2003. Rev. Bras. Zootec., 32 (5): 1243-1249
Utilizacao de soja integral tostada na dieta de vacas em lactacao, em pastagem de coastcross ( Cynodon dactylon, L. Pers.)
The purpose of this study was to evaluate the effect of inclusion of roasted whole soyabean (RWS) on the concentrate composition for supplementary feeding of Holstein cows on coastcross-1 pasture. Twelve early-lactating cows were divided into two groups as follows: (A) cows fed standard concentrate (control) containing soyabean meal (23.5% CP and 80% TDN); and (B) cows fed RWS-enriched concentrate (19.5% CP and 86% TDN). Daily concentrate feeding was 9 kg/cow. An electric fence was utilized for pasture management, which was based on rotational grazing, with one day of paddock occupation and a resting period of 25 days. The experiment lasted 100 days. During summer, the pasture was fertilized with 140, 32 and 112 kg/ha of N, P 2O 5 and K 2O, respectively, divided into four applications. The inclusion of RWS caused an increase in milk production and fat-corrected (to 3.5%) milk production (22.2 and 23.6 kg/cow/day) compared to those of the control cows (19.8 and 19.7 kg/cow/day). The milk fat levels in the treatment and control cows were 4.16 and 3.49%, respectively. The cows fed RWS-enriched concentrate exhibited superior milk production, reaching 145.4 kg milk/ha/day. In both treatments, the cows showed weight gains.