Se evaluaron tres tratamientos (3, 4, 5 animales/ha), con dos repeticiones en un diseño de bloques al azar. Se determinó el rendimiento, la composición botánica y química, la degradabilidad in situ de la materia seca y la ganancia diaria de peso. La factibilidad económica se determinó mediante la relación beneficio/costo. El rendimiento de materia seca fue de 1.925,16, 1.111,18 y 884,92 kg ha -1 para los tratamientos 3, 4, 5 animales/ha, respectivamente, y se presentaron diferencias (p<0,05), mientras que la calidad de la pastura no las presentó (p>0,05). Las ganancias diarias de peso fueron de 1,07, 0,989 y 0,940 kg/animal para los tratamientos 3, 4, 5 animales/ha, respectivamente, y se presentaron diferencias (p<0,05). El tratamiento 5 animales/ha presentó los mejores indicadores económicos.Palabras claves: Brachiaria, Mulato II, producción de carne, rotación de potreros, carga animal, riego con pivote lineal AbstractThe main objective of this study was to evaluate the production of meat during the dry period in Brachiaria hybrid cv. Mulato II pasture with three stocking rates, irrigated and spring fertilized. The research was conducted for 140 days at the Center for Research Turipaná of the Colombian Corporation of Agricultural Research (Corpoica), located at Cereté, Córdoba (Colombia). Were grazed 48 cattle, commercial zebu with average weight of 339 ± 29 kg in an area of 12 hectares. Three treatments (3, 4, 5 animals/ha) were evaluated with two replications in a randomized block design. Production, chemical and botanical composition, in situ degradability of dry matter and the daily weight gain was determined. Economic feasibility was determined by the benefit/cost ratio. The dry matter production was 1.925.16, 1.111.18 and 884.92 kg ha -1 for treatments 3, 4, 5 animal/ha respectively, detected differences (p<0.05). The quality of the pasture showed no difference (p>0.05). For daily gain analysis found differences (p<0.05), with gains of 1.07, 0.989 and 0.940 kg animal for treatments 3, 4, 5 animal/ha. The treatment 5 animal/ha provided the best indicators economical.
Intake and digestibility of leaves, Acacia macracantha (Am) and A. tamarindifolia (At), in rations mixed with ammoniated rice straw (R) and maize hominy (C), was evaluated for growing goats. 8 goats (20.5 kg liveweight) were used in the experiment. A complete randomized experimental design with a factorial (2×2) arrangement was conducted. The factors were: 1. Am and At; 2. Two different inclusion levels: low (18.75%) (L) and high (37.5%) (H). The intake of Am was higher (803 g DM/day) compared with At (638 g DM/day). Intake at different inclusion levels did not differ between species (H=685 and L=765 g/goat/day, P=0.247). The digestibility of the two Acacia species differed: DM, Am=80.02 and At=74.62%; NDF, Am=80.33 and At= 74.79%; hemicellulose, Am=94.35 and At= 88.50%. It was concluded that intake and digestibility of Am was higher than of At.
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