Effects of energy sources and inclusion levels of concentrate in sugarcane silage-based diets of finishing Nellore young bulls: Feeding behaviour, performance and blood parameters

Autor(es)

Ferrari, V. B. ^[1] ; Consolo, N. R. B. ^[1] ; Sousa, R. T. ^[1] ; Souza, J. M. ^[1] ; Santana, M. H. A. ^[2] ; Silva, L. F. P. ^[3]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Sch Vet Med, Dept Anim Sci, 225 Duque de Caxias Norte, BR-13635900 Pirassununga, SP - Brazil

^[2] Univ Sao Paulo, Coll Anim Sci & Food Engn, Dept Vet Med, 225 Duque de Caxias Norte, BR-13635900 Pirassununga, SP - Brazil

^[3] Univ Queensland, 306 Carmody Rd, Bld 80, St Lucia, Qld 4072 - Australia

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF AGRICULTURAL SCIENCE; v. 157, n. 4, p. 350-356, MAY 2019.
• Citações Web of Science: 0

Resumo

Replacing ground maize (GM) with steam-rolled maize typically increases feed efficiency in maize-silage-based diets. However, little is known about optimal carbohydrate supplementation in sugarcane silage-based diets. The objective was to quantify the effect of partially replacing GM with steam-rolled maize (SRM) or pelleted citrus pulp (PCP) at two concentrate levels (600 or 800 g/kg DM) in sugarcane-based diets on feeding behaviour, performance and blood parameters of finishing Nellore bulls. One hundred and eight young bulls were allocated to 36 pens in a randomized block design and fed for 84 d. Feeding 800 g/kg concentrate decreased time spending eating and ruminating, but improved G:F ratio, hot carcass weight and carcass dressing, compared to 600 g/kg concentrate. Bulls fed SRM and PCP diets with 600 g/kg concentrate had lower intake compared to GM. Both final weight and average daily gain decreased when bulls were fed PCP and SRM with 600 g/kg concentrate compared to GM diets, and when fed with PCP and 800 g/kg concentrate. Substituting PCP for GM decreased gain efficiency, carcass weight, rumination time and intake efficiency, indicating that the bulls consumed less feed per hour spent eating. Substituting SRM for GM increased backfat thickness and blood urea concentration. In conclusion, the replacement of GM with PCP reduces intake and enhances selection against large particles, decreasing rumination, performance and final carcass weight and dressing. Replacement of GM with SRM increases blood urea and fat deposition, with no impact on performance. (AU)

• Processo FAPESP: 12/12125-0 - Efeito de fontes de carboidratos não fibrosos sobre o ganho de peso, consumo, características da carcaça, cinética e ecossistema ruminal de tourinhos em terminação
• Beneficiário: Luis Felipe Prada e Silva
• Modalidade de apoio: Auxílio à Pesquisa - Regular