José Luiz Viana Coutinho Filho

Produção de carne de bovinos contemporâneos, machos e fêmeas, terminados em confinamento

Economic and animal performance of feedlot beef young bulls and heifers fed finishing diets were evaluated in this trial. Twenty-eight Santa Gertrudis bovines (14 young bulls and 14 heifers) were assigned to a completely randomized design and maintained in individual pens. Diets were formulated to fulfill the weight gain requirements of finishing animals. The measured variables were affected by sex. Daily weight gain (DWG), feed conversion, carcass yield, and dry matter (DM) intake were: 1.80 and 1.22 kg/day, 5.61 and 7.18 kg DM/kg DWG, 55.61 and 52.75%, and 10.08 and 8.87 kg/day, respectively, for young bulls and heifers. Males had greater carcass yield but females showed higher proportion of beef round as well as the main commercial cuts. According to an economic analysis, the cost to produce 15 kg of carcass was R

Avaliação da silagem de grãos de milho úmido com diferentes volumosos para tourinhos em terminação: desempenho e características de carcaça

33.95 for young bulls and R

Desempenho e características da carcaça de tourinhos Santa Gertrudes confinados, recebendo dietas com alto concentrado e níveis crescentes de polpa cítrica peletizada

37.02 for heifers.

Desenvolvimento ponderal de bezerras desmamadas em pastejo de Brachiaria decumbens com suplementação protéica e energética

O experimento foi realizado com o objetivo de comparar os efeitos do fornecimento de silagem de graos de milho umido com o milho em grao seco, associados a silagem de milho ou ao bagaco in natura de cana-de-acucar, sobre o desempenho e as caracteristicas da carcaca de bovinos em terminacao. Em blocos ao acaso e esquema fatorial 2 × 2, 28 tourinhos Santa Gertrudes (dez meses de idade e peso corporal inicial de 245 kg) foram mantidos em confinamento durante 142 dias. Os animais foram mantidos em baias individuais e receberam dietas com 12 e 20% da MS em forma de bagaco ou silagem, respectivamente. O milho umido foi moido e ensilado quando se encontrava com 30% de umidade. Nao houve interacao significativa tipo de volumoso x tipo de processamento do milho sobre as variaveis estudadas. O bagaco mostrou-se viavel como fonte exclusiva de fibra, apesar de os resultados de ganho de peso, eficiencia alimentar, peso e rendimento de carcaca e espessura de gordura subcutânea terem sido inferiores aos obtidos com a silagem de milho. O ganho diario de peso nos animais alimentados com o bagaco foi em torno de 1,3 kg, enquanto, com a silagem, foi de 1,5 kg. O consumo de MS nao foi influenciado pelo tipo de volumoso ou pelo processamento do milho. O uso da silagem de graos de milho umido melhorou a eficiencia alimentar em 9,7% e reduziu o peso do figado quando comparado ao milho seco, mas nao alterou as demais caracteristicas avaliadas.

Carcass characteristics of purebred and crossbred Nellore females fed solely pasture

The experiment was developed to evaluate the effect of the replacement of corn grain by dehydrated citrus pulp pellets on the performance and carcass characteristics of Santa Gertrudis young bulls fed high concentrate diets. Twenty-eight bulls, with average age of nine months and an initial weight of 277 kg, were kept in individual pens and fed during 92 days, after 21 days of adaptation. The animals were fed a diet with 20% of the dry matter as corn silage, with 40% of grain. Treatments evaluated included levels of 0, 25, 40 and 55% of dehydrated citrus pulp pellets in the dry matter diet. There was no effect of citrus pulp level on the average daily gain, daily dry matter intake, feed efficiency, carcass dressing, Longissimus muscle area and the kidney, pelvic and inguinal fat. The increasing level of citrus pulp on the diet decreased linearly the backfat thickness and increased linearly the liver weight and carcass weight. The feces pH was similar for all the citrus pulp levels. Liver abscess were not detected, although the diet had high concentrate level. The dehydrated citrus pulp pellets can compound until 55% of dry matter diet, replacing corn grain to finishing young bulls fed high concentrate diets, with a small decrease in subcutaneous fat.

Manejo de campos de produção de sementes de Brachiaria humidicola “comum”: I - Efeito de doses de nitrogênio

The concentrate supplementation effect upon ponderal performance of calves during the year (dry and wet seasons) was evaluated. Thirty-six Santa Gertrudis calves averaging 194 kg of live weight, with 290 days of age, grazing Brachiaria decumbens pasture, were used in a complete randomized design. The following supplements have been added ad libitum, fed during the experimental period: mineral mix, supplement based on degradable protein, during dry season, and supplement based on non-degradable protein (escape protein), during wet season. Results on average daily gain demonstrated a significant difference between treatments. The average daily gains were 0.504 and 0.561 kg animal-1 day-1 for the non-supplemented group (control group, fed mineral mix only), and supplemented group, respectively. During dry season, supplemented calves showed significantly higher average daily gain, and during wet season there was no difference. Pasture supplementation did not present bioeconomic advantage, then its use could not be recommended. In both treatments, calves reached the average weight limit, for first mating, at nearly 14 months of age.

Diferentes fontes protéicas combinadas com espiga de mestiços canchin em confinamento

This research aimed to compare carcasses of purebred and crossbred Nellore females reared uniquely on pasture (Brachiaria decumbens and Brachiaria brizantha cv. Marandu). Breeds assessed consisted of purebred Nellore (16) and Nellore x Santa Gertrudis crossbred (16), being 32 ± 1.5 months old. All animals were slaughtered as they reached 450 kg. Crossbred females showed higher slaughter, hot and cold carcass weights and longer lengths (P < 0.05). Conversely, purebred animals attained greater carcass yields (P < 0.05). Nonetheless, crossbred females had higher primal cut weights and plate/ flank percentage (P < 0.05). Also, non-carcass components as kidneys, liver, kidney-pelvic-heart fat showed higher weights for crossbred females (P < 0.05). Thus, regarding beef cattle reared and finished exclusively on grazing areas, crossbred females (Nellore x Santa Gertrudis) may be the most profitable ones for cattle raisers, since they produce heavier slaughtering carcasses. Notwithstanding, they might be interesting for meat industry, for yielding more in prime cuts than purebreds, even if raised at the same conditions and slaughtered at same age.