Made available in DSpace on 2016-04-28T14:59:42Z (GMT). No. of bitstreams: 1 2006-Josue Lopes de Castro.pdf: 352206 bytes, checksum: 82b2c9ce218435164236f90f794fb47a (MD5) Previous issue date: 2006-09-12 / The feed-lot trial was carried the main goal was the evaluation of liveweight gain made by 5 months old male lambs of St Ines breed receiving diets with three levels of concentrate substitution by Puero hay. The experiment lasted for 55 days with 15 days of adaptation period. The concentrate was made out 50% of wheat bran 35% of ground corn and 15% of soybean meal. The Statistical Design was Completely Random with five replications and three treatments: Treatment one 0%, treatment two 50% and treatment three 100% of hay. The animals were kept in three pens (five lambs in each one). They were feed daily at 8:00 h and had their movements individually restrained during feeding time. Feeding and refused were weighed daily, samples were collected and sent for bromatological analysis (DM, CP, NDF, ADF, Hcel, Cel, Lig and Ashes). The performance was evaluated through daily consumption and daily liveweigth gain. The results showed significant differences (P<0,05) between T1 and T3 (0 and 100% of substitution, with 194,5 and 74,2 g/day, respectively). T2 (50% of substitution with 135,5 g/day of liveweigth gain was not significantly different either from T1 and T3. The concentrate substitution is feasible and brought a noticeable reduction on feeding costs, since the net profits were of R$110,00 R$101,90 and R$47,75, for T1, T2 and T3, respectively. / O experimento foi conduzido no Col?gio T?cnico da Universidade Federal Rural do Rio de Janeiro. Com o objetivo de avaliar o desempenho produtivo de cordeiros machos n?o castrados da ra?a Santa In?s confinados e alimentados com dietas ? base de concentrado e feno de Kudzu Tropical. O per?odo experimental foi de 55 dias, sendo 15 dias de adapta??o ?s dietas. Foram utilizados 15 cordeiros com idade m?dia de cinco meses. O delineamento experimental foi o inteiramente casualizado, com 5 repeti??es (animais) por tratamento (0, 50 e 100% de inclus?o de feno de kudzu tropical). Os animais foram mantidos em 3 baias coletivas, cada uma com 5 animais. O fornecimento das dietas foi realizado ?s 08:00h, sendo os animais contidos por canzis para individualiza??o do fornecimento. As sobras foram recolhidas diariamente para posterior an?lise. Foram realizadas an?lises bromatol?gicas das dietas e das sobras. Analisou-se mat?ria seca (MS), prote?na bruta (PB), fibra em detergente neutro (FDN), fibra em detergente ?cido (FDA), hemicelulose (HCEL), celulose (CEL), lignina (LIG) e mat?ria mineral (MM). Foram avaliados os consumos de nutrientes e o ganho de peso m?dio di?rio (GPMD). Os resultados mostraram diferen?as significativas (P<0,05) entre os percentuais de 0 e 100% com m?dia de ganho de peso de 194,5 e 74,2g/animal/dia, respectivamente. Por?m o mesmo n?o foi observado entre os percentuais de 0 e 50% com m?dias de 194,5 e 135,5g/ animal/dia, respectivamente, indicando que a inclus?o do feno de kudzu tropical pode ser uma alternativa para a diminui??o dos custos de produ??o. No presente trabalho observou-se rendimentos l?quidos de R$ 110,00, R$ 101,90 e R$ 47,75 para os tratamentos T1, T2 e T3, respectivamente.