RESUMO

The objective with this study was to evaluate intake, feeding behavior, rumen fluid characteristics, performance, and nutrient digestibility of sheep fed banana pseudostem hay (BPH) with and without virginiamycin (VM). Thirty-two uncastrated male crossbred Dorper × Santa Inês lambs at approximately five months of age, with an average initial body weight of 25.00±1.95 kg, were used in the experiment. Four diets were tested, as follows: Tifton grass hay (TGH) plus concentrate with VM; BPH replacing 60% of TGH plus concentrate with VM; TGH plus concentrate without VM; and BPH replacing 60% of TGH plus concentrate without VM. The experiment was set up as a completely randomized design in a 2×2 factorial arrangement, in which the factors were represented by BPH and TGH with and without VM, organized in an orthogonal contrast. Banana pseudostem hay inclusion influenced nutrient intake, except for non-fibrous carbohydrates corrected for ash and protein. Neither idling nor water intake times were changed by VM inclusion or banana pseudostem hay addition. Rumen fluid pH did not differ among the contrasts (THV+BHV) vs. (TH+BH), THV vs. TH, and BHV vs. BH, which were used to evaluate VM influence. Banana pseudostem increased rumen fluid pH in the contrast THV vs. BHV, both treatments including VM. Mean temperature of rumen fluid was 34.07 °C, and it did not change by inclusions of VM or banana pseudostem hay. No difference was observed for crude protein digestibility in the evaluated contrasts. When associated with virginiamycin, banana pseudostem hay provides satisfactory performance and nutritional parameters for feedlot sheep. Virginiamycin does not change the performance or nutritional parameters of these animals when Tifton grass hay is used as the only roughage source.(AU)

Assuntos

RESUMO

The objective of this study was to evaluate carcass yield, measurements, cuts, and fat deposition of sheep fed banana pseudostem hay and Tifton 85 grass hay, with or without virginiamycin. Thirty-three uncastrated male Dorper × Santa Ines crossbred lambs at five months of age, with an average body weight of 25.00 ± 1.95 kg, were used in a feedlot experiment. The following four diets were evaluated: Tifton 85 grass hay plus concentrate with virginiamycin, banana pseudostem hay replacing 60% of Tifton 85 grass hay plus concentrate with virginiamycin, Tifton 85 grass hay plus concentrate without virginiamycin, and banana pseudostem hay replacing 60% of Tifton 85 grass hay plus concentrate without virginiamycin. The experiment was set in a completely randomized design, in a factorial scheme, using orthogonal contrasts. The diet replacing 60% Tifton 85 grass hay by banana pseudostem hay without virginiamycin had no effect on carcass traits. The combination of virginiamycin and Tifton 85 grass hay provided increases in warm carcass weight, warm carcass yield, spine, omental and mesenteric fat deposition, and, regardless of roughage, increases in the thoracic perimeter.

O objetivo deste estudo foi avaliar o rendimento, as medidas, os cortes e a deposição de gordura em ovinos alimentados com feno de pseudocaule de bananeira e feno de capim-tifton 85, com ou sem virginiamicina. Trinta e dois cordeiros mestiços Dorper × Santa Ines, não castrados, aos cinco meses de idade, com peso corporal médio de 25,00 ± 1,95 kg foram utilizados no experimento em regime de confinamento. Foram avaliadas quatro dietas: feno de capim-Tifton 85 mais concentrado com virginiamicina; feno de pseudocaule de bananeira substituindo em 60% o feno de capim Tifton 85 mais concentrado com virginiamicina; feno de capim Tifton 85 mais concentrado sem virginiamicina; e feno de pseudocaule de bananeira substituindo em 60% o feno de capim Tifton 85 mais concentrado sem virginiamicina, em delineamento inteiramente casualizado, em arranjo fatorial 2x2 em contraste ortogonal. A substituição de 60% do feno de capim Tifton 85 por feno de pseudocaule de bananeira sem virginiamicina na dieta de ovinos não altera suas características de carcaça. A virginiamicina associada ao feno de capim Tífton 85 proporcionou aumento do peso de carcaça quente e do rendimento de carcaça quente, aumento do espinhaço, aumento das deposições de gorduras omental e mesentérica e, independente dos volumosos, aumento do perímetro torácico.

Assuntos

RESUMO

The objective of this study was to evaluate carcass yield, measurements, cuts, and fat deposition of sheep fed banana pseudostem hay and Tifton 85 grass hay, with or without virginiamycin. Thirty-three uncastrated male Dorper × Santa Ines crossbred lambs at five months of age, with an average body weight of 25.00 ± 1.95 kg, were used in a feedlot experiment. The following four diets were evaluated: Tifton 85 grass hay plus concentrate with virginiamycin, banana pseudostem hay replacing 60% of Tifton 85 grass hay plus concentrate with virginiamycin, Tifton 85 grass hay plus concentrate without virginiamycin, and banana pseudostem hay replacing 60% of Tifton 85 grass hay plus concentrate without virginiamycin. The experiment was set in a completely randomized design, in a factorial scheme, using orthogonal contrasts. The diet replacing 60% Tifton 85 grass hay by banana pseudostem hay without virginiamycin had no effect on carcass traits. The combination of virginiamycin and Tifton 85 grass hay provided increases in warm carcass weight, warm carcass yield, spine, omental and mesenteric fat deposition, and, regardless of roughage, increases in the thoracic perimeter.(AU)

O objetivo deste estudo foi avaliar o rendimento, as medidas, os cortes e a deposição de gordura em ovinos alimentados com feno de pseudocaule de bananeira e feno de capim-tifton 85, com ou sem virginiamicina. Trinta e dois cordeiros mestiços Dorper × Santa Ines, não castrados, aos cinco meses de idade, com peso corporal médio de 25,00 ± 1,95 kg foram utilizados no experimento em regime de confinamento. Foram avaliadas quatro dietas: feno de capim-Tifton 85 mais concentrado com virginiamicina; feno de pseudocaule de bananeira substituindo em 60% o feno de capim Tifton 85 mais concentrado com virginiamicina; feno de capim Tifton 85 mais concentrado sem virginiamicina; e feno de pseudocaule de bananeira substituindo em 60% o feno de capim Tifton 85 mais concentrado sem virginiamicina, em delineamento inteiramente casualizado, em arranjo fatorial 2x2 em contraste ortogonal. A substituição de 60% do feno de capim Tifton 85 por feno de pseudocaule de bananeira sem virginiamicina na dieta de ovinos não altera suas características de carcaça. A virginiamicina associada ao feno de capim Tífton 85 proporcionou aumento do peso de carcaça quente e do rendimento de carcaça quente, aumento do espinhaço, aumento das deposições de gorduras omental e mesentérica e, independente dos volumosos, aumento do perímetro torácico.(AU)

Assuntos