Soybean silage and sugarcane tops silage on lamb performance/Silagem de soja e silagem de ponta de cana no desempenho de cordeiros

The objective of this study was to evaluate the performance of sheep fed with diets consisting of different proportions of soybean silage and sugarcane tip silage. Twenty four lambs from Morada Nova breed were used, with an average age of 75 days and average weight of 16.98 [+ or -] 2.62kg. The following diets were evaluated: T1 = 20% sugarcane tops silage + 80% concentrate, T2 = 20% sugarcane tops silage + 30% soybean silage + 50% concentrate, T3 = 20% sugarcane tops silage + 60% soybean silage + 20% concentrate. The experimental design was a randomized complete block with eight repetitions and each animal was a repetition. It was evaluated the intake of dry matter, organic matter, ash, crude protein, ether extract, neutral detergent fiber, acid detergent fiber, weight gain, and feed con-version ratio and efficiency. The total weight gain, average daily gain, feed conversion ratio and efficiency were similar, with average values of 7.9kg [animal.sup.-1], 133.3g [animal.sup.-1] [day.sup.-1], 6.2 and 0.17, respectively. Diets based on sugarcane tops silage enriched with soybean silage + concentrate provide greater nutrient intake in relation to diet composed only of sugarcane tops silage + concentrate. Sugarcane tops silage supplemented with protein concentrate or enriched with soybean silage with lower inclusion of concentrate resulted in similar weight gains and feed conversion efficiency. Key words: feed conversion, feed intake, Glycine max, Saccharum officinarum, weight gain. Avaliou-se o desempenho de ovinos alimentados com dietas compostas por silagens de ponta de cana (Saccharum officinarum) e de soja (Glycine max). Utilizaram-se 24 cordeiros da raca Morada Nova, com idade media de 75 dias e peso vivo medio inicial de 16,98kg. Avaliaram-se as dietas: T1 =20% silagem de ponta de cana + 80% de concentrado; T2=20% silagem de ponta de cana + 30% silagem de soja + 50% de concentrado; T3=20% silagem de ponta de cana + 60% silagem de soja + 20% de concentrado. O delineamento foi em blocos casualizados, com oito repeticoes, sendo cada animal uma repeticao. Avaliaramse os consumos de materia seca, materia organica e materia mineral; proteina bruta; extrato etereo; fibra em detergente neutro e em detergente acido; ganho de peso e conversao e eficiencia alimentar. Os ganhos de peso total e diario, a conversao e a eficiencia alimentar foram semelhantes, com valores medios de 7,9kg [animal.sup.-1] 133,3g [animal.sup.-1] [dia.sup.-1]; 6,2 e 0,17; respectivamente.