EFFECTS OF LOW ANTINUTRITIONAL FACTORS RAW FULL-FAT SOYBEAN ON BEEF CATTLE FEEDING. INFRA-VITAM PERFORMANCE

The aim of this trial was to evaluate the effects of different sources of soybean on the infra-vitam performance of fattening beef cattle. The animals (56 Limousine) were divided, according to BW (287±17 kg), in 4 experimental groups: LAFS (raw full-fat soybean low in antinutritional factors); SBM (soybean meal); TS (toasted full-fat soybean); NTS (non toasted full-fat soybean). The animals were fed a basal diet (TMR) (DM:59.5%; CP:9.3%DM; NDF:33.9%DM; starch:34.9%DM) supplemented as top dressing with different sources of soybeans in order to reach the same amount of additional CP (473 g/d). To obtain isoenergetic diets, calcium soap of palm fat (234 g/d) was also added to SBM group. Animals were weighed monthly, DM intake was calculated daily and two blood samplings were collected. No metabolic disorders or pathological events were observed during the experiment. The daily gains of the first 6 months were not significantly different among the 4 experimental groups (on the average 1.35 ± 0.25 kg/d). DM intake values in the same period were similar (8.57 ± 0.78 kg/d of DM). The soybean supplementation did not affect the metabolic parameters (calculated as differences between the sampling times) except for the *-glutamyl-transferase (P