Arquivo Brasileiro de Medicina Veterinária e Zootecnia
On-line version ISSN 1678-4162
DIAS, A.M. et al. Cassava bagasse in diets of dairy heifers: intake of nutrients and productive performance. Arq. Bras. Med. Vet. Zootec. [online]. 2008, vol.60, n.4, pp.987-995. ISSN 1678-4162. http://dx.doi.org/10.1590/S0102-09352008000400030.
The inclusion of 0, 7, 14, and 21% of cassava bagasse in the diet of dairy was evaluated during 56 days. Twenty ¾Gir x ¼Holstein heifers were used, being five animals per treatment. The diets were balanced to provide a weight gain of 0.70kg/day, and it was measured at every 28 days. Intake of nutrients, average daily weight gain (DWG), and feed conversion (FC) were evaluated. The intake was expressed in kg/day, body weight percentage (BW%) and grams for kg of metabolic weight (g/kg0.75). The intakes of dry matter and crude protein were not affected by the inclusion of cassava bagasse to the diet, but intakes of the neutral detergent fiber and acid detergent fiber linearly decreased with the increase of the cassava bagasse level. However, the intake of non-fiber carbohydrates linearly increased (P<0.10). The DWG was 0.84; 0.80; 0.79; and 0.51 kg/day and the FC was 7.2; 7.5; 8.4; and 12.6 for treatments 0, 7, 14, and 21%, respectively. The best level of cassava bagasse utilization in diets of heifers was 14%.
Keywords : dairy heifer; cassava bagasse; intake; weight gain.