Abstract
Forages play a key role on the performance of beef cattle in feedlot systems. Twenty-four non-castrated Red Norte × Nelore males with an average initial body weight (BW) of 439.8 kg and 21.7 months of age were distributed in three experimental groups, and housed either in individual or collective pens (twelve animals in individual pens and twelve in three collective pens) at the School-Farm of IF Goiano (Iporá Campus). The experiment lasted 84 days (14 days for adaptation and 70 days for data collection). Animals were fed once daily with diets containing in natura sugar cane (ISC), sugar cane silage (SCS) or corn silage (CS) as sources of forage. Feed refusals were measured daily and dry matter intake (DMI) was determined by difference. BW was recorded every two weeks after a twelve-hour fasting period. There was no effect (P>0.05) of source of forage on DMI in animals housed in individual pens, as well as there was no response (P>0.05) of source of forage on growth performance. The three sources of forage did not alter (P>0.05) carcass traits. Animals housed in individual pens increased (P
Highlights
Forages play a key role on the performance of beef cattle in feedlot systems
Animals housed in individual pens increased (P
The three sources of forage (ISC, sugar cane silage (SCS) and corn silage (CS)) can be recommended for beef cattle feeding in feedlot systems
Summary
O presente estudo foi conduzido na Fazenda Experimental do IF Goiano (Campus Iporá) entre 30 de junho a 15 de setembro de 2014, com duração de 84 dias (14 dias de adaptação dos animais às instalações e dietas experimentais e 70 dias de período experimental). No primeiro dia da fase de adaptação os animais foram desvermifugados com Fenbendazole a 10% por via oral e receberam aplicação contra ectoparasitas à base de 5% de Cipermetrina, 2,5% de Clorpirifós e 1% de Butóxido de Piperonila ao longo da linha dorsalcaudal. Os animais foram alimentados uma vez ao dia entre 05:00 e 07:00 horas com quantidades ajustadas diariamente para se obter entre 10 a 15% de sobras, a fim de se garantir o máximo consumo voluntário de MS. As três dietas foram formuladas para conterem concentrações semelhantes de FDN e proteína bruta (PB), e balanceadas para atender as exigências nutricionais diárias de bovinos de corte em confinamento com ganho de peso esperado de 1,8 kg/dia (NRC, 2000). Cana-de-açúcar in natura (Ci) Silagem de cana (SC) Silagem de milho (SM) MDPS2 Milho triturado Farelo de soja Ureia protegida Núcleo vitamínico mineral
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