The objective of this study was to identify possible alterations in the composition and anaerobic biodigestion process of manure from Canchim and Nellore cattle in different periods in feedlot fed with different forage to concentrate ratios. The experiment was carried out in complete randomized design in factorial arrangement with time as sub-divided plot. Plots were established by four treatments: manure from two diets (40% forage and 60% concentrate and 60% forage and 40% concentrate) and two genotypes (Canchim and Nellore) […]

The objective of this study was to identify possible alterations in composition and in the composting process of manure produced by Canchim and Nellore cattle in different periods of feedlot and fed different forage to concentrate ratios. The experiment was carried out in complete randomized design in factorial scheme with time as subdivided plot. Plots were established by four treatments: manure from two diets (40% forage and 60% concentrate and 60% forage and 40% concentrate) and two genotypes (Canchim and […]

The objective was to evaluate the performance of beef heifers until calving receiving different levels of supplementation on native pasture during the first breeding season, from 14 to 17 months: no supplementation; 3.5 g/kg of body weight; and 7.0 g/kg of body weight. Ninety-eight Charolais, Nellore and their crosses, with average initial weight of 255 kg, were used. Weight at the end and average daily weight gain during the supplementation period were higher for 7.0 g/kg of supplement heifers (322 […]

The objective of this study was to evaluate the characteristics of external components and discard fat of young steers with two different sexual conditions and two different genotypes, finished in feedlot. Average age and weight of the animals at the beginning of the experimental period were 12 months and 267.0 kg, respectively. The steers were in feedlot until reaching pre-established slaughter weight of 400 kg. Diet contained roughage:concentrate ratio of 50:50, on dry matter basis, with 10% crude protein. It […]

In the present work we aimed to compare intake, performance, feed efficiency and carcass traits of cattle from three genetic groups (GG) fed two concentrate levels in the diet. Forty-eight steers (16 Nellore, 16 Nellore-Red Angus and 16 Nellore-Simmental) were used. Twelve steers were slaughtered at the beginning of experiment as a reference group and for the remaining 36 animals, the concentrate mixture of the ration was offered as 1 and 2% of body weight basis in a 3 × […]

It was evaluated in this work, the degree of natural infestation by external parasites in beef cattle females from three genetic groups. Countings of cattle tick (Rhipicephalus (Boophilus) microplus), horn fly (Haematobia irritans) and beef-worm (Dermatobia hominis) were performed from July 2003 to December 2004 in females from the genetic groups Nellore (NE), Angus x Nellore (AN), Canchim x Nellore (CN), and Simmental x Nellore (SN) naturally infested. It was realized from 6 to 10 countings in each animal, totalizing […]

The objective of this study was to evaluate carcass characteristics of steers and cull cows from two genetic groups, under different feeding frequencies. Twelve steers and twelve cull cows were used and each category consisted of six animals 5/8 Charolais (C) – Nellore (N) and six animals 5/8NC, under three feeding frequencies: twice a day (7 a.m. and 7 p.m.); three times a day (7 a.m., 1 p.m. and 7 p.m.) and four times a day (7 a.m., 11 a.m., […]

For the conduction of this work, 24 males from four different genetic groups (⅝Charolais (CH) ⅜Nellore (NE); ⅝NE ⅜CH; ¾CH ¼NE e ¾NE ¼CH) and two ages: steers and young steers were used. The animals received a diet composed of corn silage and concentrate with roughage:concentrate ratio of 50:50. After slaughter, the carcasses were identified and⅝ chilled. A steak from the longissimus muscle was collected and dried in stove, grounded, identified and stored for lipid extraction. The fatty acids (FA) […]

The objective of this study was to evaluate the effects of feeding sugarcane bagasse, obtained by extraction of sugar using diffusion (BINdif) or conventional milling (BINmoa) method, as a fiber source associated with bagasse treated under pressure and steam (BTPV) on nutrient digestibility and ruminal characteristics in beef cattle. Four Nellore young bulls (380 kg BW), fitted with ruminal cannula, were assigned to a 4 × 4 Latin Square design. Combination of bagasse in a 50:50 (concentrate:roughage) experimental rations were: […]

This study aimed to evaluate the sexual behavior of 88 bulls of the Angus and Zebu (Gyr, Guzerat and Nellore) breeds managed for collection and processing of semen at an artificial insemination center. On average, bulls were at 5 years of age, 906 kg of live weight and 41 cm for scrotal circumference. Reaction time in all breeds was positively influenced by the “moving” stimuli teaser. Reaction time in Angus bulls was smaller than in bulls of the zebu breeds […]