Desempeño productivo de ovinos alimentados con ensilaje de pasto buffel en sustitución de ensilaje de maíz

Abstract

This study aimed to evaluate the productive performance and nutritional status of crossbred sheep fed a diet containing buffel grass silage (BGS) in substitution of corn silage (CS). Thirty-two male Santa Inês sheep with an average body weight of 20.09 ± 2.0 kg were distributed in a completely randomized block design with four treatments (0, 33.3, 66.6, and 100 % of substitution of corn silage with buffel grass silage) and eight animals per treatment. Dry matter intake, apparent nutrient digestibility, water balance, nitrogen balance, and productive performance of animals were evaluated. The different levels of substitution of corn silage by buffel grass silage promoted a linear decrease in the consumption of ether extract (P=0.001) and non-fibrous carbohydrate (P<0.001), apparent digestibility of non-fibrous carbohydrate (P=0.019), water intake via food (P<0.001), total water intake (P=0.008), water excretion via urine (P=0.004), total water excretion (P=0.001), among which the highest values were observed in animals fed 100% corn silage. Water excretion via feces (P=0.017) and nitrogen balance (P=0.047) showed a quadratic function, increasing as substitution with buffel grass silage increased from 0 to 33.3 %. No significant differences (P>0.05) were observed in sheep productive performance, with an average daily weight gain of 140.16 g/d. The replacement of 66.6 % of CS for BGS provides satisfactory results for dry matter and nutrients intake, and water intake, with weight gain of up to 155 g/d for Santa Inês crossbred sheep in Brazilian semi-arid.