Thirty six Nellore bulls, with 240 kg initial live weight (LW), were used and distributed in eight treatments, with four different concentrate levels in the diets (20; 40; 60 and 80%) and two crude protein (CP) levels (15 and 18%) with four reference bulls. After the slaughter, the carcass dressing percentage, the basic cuts percentages, the carcass length, the loin eye area, the subcutaneous fat thickness, and the carcass muscle, fat, bone, protein, ether extract, water percentages, the organs and […]

Fifty F1 Limousin x Nellore bulls were allotted to ten treatments, with five concentrate levels (25; 37.5; 50; 62.5 e 75%) and two diet protein balance methods (one isoprotein and the other changing protein as diet energy changed). The roughage used was Coastcross grass hay (Cynodon dactylon). After the slaughter, all animal body parts were weighted and sampled. The samples were dried, most of the fat was extracted with ether, grinded, and the concentrations of macrominerals were determined. Ca, P, […]

Fifty F1 Limousin x Nellore bulls were allotted to ten treatments, with five concentrate levels (25, 37.5, 50, 62.5, and 75%) and two diet protein balance methods (one isoprotein and the other changing protein as diet energy changed). The intake of dry matter (DM), organic matter (OM), crude protein (CP), neutral detergent fiber (NDF) and total digestible nutrients (TDN) were determined. After the slaughter, all animal body parts were weighed, sampled and DM, total nitrogen and ether extract concentrations were […]

It was aimed to study the efficiency of microbial synthesis and ruminal parameters in bovine. It were used five 165 kg growing no-castrated Nellore bulls, rumen, abomasum and ileum fistulated.A randomized blocks design with four treatments and five collection periods was used. The treatments consisted of four concentrate levels (20, 40, 60 and 80%). The roughage used was Tifton 85′ (Cynodon dactylon (L.) Pers.) Bermudagrass hay. The diets were isonitrogen with 15% of crude protein. The microbial marker used was […]

Fifty F1 Limousin x Nellore bulls were allocated in ten treatments, with five concentrate levels (25, 37.5, 50, 62.5, and 75%) and two diet protein balance methods (one isoprotein and the other changing protein as diet energy changed). Dry matter intake (DMI) required to maintain the energy balance was calculated dividing the metabolizable energy intake (MEI) required for maintenance (112.89 kcal/kg EBW0.75), by diet ME concentration (kcal/kg of DM), in each treatment. The net energy concentration for maintenance (NEm) of […]

It was aimed to evaluated the nutrients intake and digestibility of growing and finish Nellore bulls diets. It were used 32 non-castrated Nellore bulls, with 240 kg, confined in individual stalls, in the growing phase, and 16 animals with 360 kg in the finishing phase. The treatments were four concentrate levels (20, 40, 60, and 80%) and two percentages of crude protein (15 and 18%) in the diets. It was used an experimental design randomized, with four replicates, in the […]

Thirty six Nellore bulls, with 240 kg initial live weight (LW), were used. Four were reference bulls and the remaining were distributed in eight treatments, with four different concentrate levels in the diets (20; 40; 60 and 80%) and two crude protein (CP) levels (15 and 18%), in dry matter basis. The dry matter (DMI), organic matter (OM), CP, neutral detergent fiber (NDF) and total digestible nutrients (TDN) intakes were determined, as well as the average LW gain (LWG), empty […]

ABSTRACT – This work was conducted to evaluate the effects of different concentrate levels on the liquid passage rates, using Co-EDTA, and particulate, using ytterbium chloride and Cr-mordant, and the in situ ruminal degradation kinetics of dry matter (DM) and crude protein (CP). Five rumen and abomasum fistulated bull Holstein calves, with an initial average age of 5.8±0.7 months and initial average of 107.4±11.0 kg LW were allotted to a 5×5 Latin square design (treatment x period). The animals were […]