Arquivo Brasileiro de Medicina Veterinária e Zootecnia
On-line version ISSN 1678-4162
PUTRINO, S.M. et al. Apparent digestibility of diets with increasing concentrate levels in Brangus and Nellore steers. Arq. Bras. Med. Vet. Zootec. [online]. 2007, vol.59, n.2, pp.406-413. ISSN 1678-4162. http://dx.doi.org/10.1590/S0102-09352007000200022.
The apparent digestibility of diets with 20, 40, 60 or 80% of concentrate fed Brangus and Nellore steers was determined through total fecal collection. Eight animals, four of each breed, were used in two 4 x 4 Latin square design with five days of adaptation to the diets and five days of collection in each period. The initial age and body weight of Brangus and Nellore steers were 13 months and 248 kg, and 30 months and 403kg, respectively. Concentrate levels affected (P<0.01) the digestibility coefficients of dry matter (DM), crude protein (CP), ether extract, crude fiber, neutral detergent fiber, nitrogen free extract (NFE), organic matter (OM) and total digestible nutrients (TDN). The diet with 80% of concentrate showed higher DM, CP and TDN digestibilities. The digestibility of NFE, OM and the dry matter intake were different according to the breeds (P<0.05). Brangus showed higher DM and TDN intake. The DM and TDN intake showed interaction (P<0.01) breed by concentrate level, with higher intake for the Brangus at higher TDN diets. The Nellore steers were less adapted to diets rich in concentrate than Brangus steers.
Keywords : beef cattle; consumption; digestibility; concentrate.