Grãos de oleaginosas inteiros na alimentação de bovinos em confinamento

Abstract

The objective of this work was to evaluate the different sources of oilseeds in the feed of cattle in confinement. Three crossbred cattle with a mean weight of 350 kg with a ruminal cannula were kept in individual stalls and distributed in a non-contemporaneous 3x3 Latin square repeated in time. The animals received corn silage as voluminous. The diets were composed of the canola (Brassica napus), crambe (Crambe abyssinica Hochst) and soybean (Glycine max) grains, in a concentrated ratio: 60:40, respectively, and were supplied at will, with an excess of 20%. The diet was provided individually, divided into two daily meals (8 am and 4 pm). The coefficients of total apparent digestibility of dry matter (DM), organic matter (OM), crude protein (CP), neutral detergent fiber (NDF) and ethereal extract (EE), obtained a relation between total nutrients retained and Fecal excretion. The total dry matter intake was affected by the type of oilseed used where the inclusion of canola and soybean grains did not show differences and the crambe grain reduced consumption by 21.02%. There was no difference (P> 0.05) between the different sources of oilseeds on the total digestibility of DM, OM and CP. There was an effect (P <0.05) of the chemical composition of the grains excreted in the faeces for all traits evaluated, and the soybean grain had lower EE values (4.32%), followed by canola grain (16.78 %) And crambe (6.46%). There was an effect of the inclusion of oilseeds on ruminal pH, with values of 6.16; 6,72 and 6,21 for the treatments of canola, crambe and soybean respectively. The use of crambe grain in the diet reduces the animals' dry matter intake and alters nutrient digestibility. The supply of whole soybeans allows the best use of lipids present in the diet, and canola grains provided the highest peaks of ruminal ammonia.