Abstract
The use of dietary supplement in livestock is an alternative to reduce both production costs and time of slaughter of animals in the finishing phase. In addition, organic and anti-parasitic pacemakers are used together with the purpose to enhance animal growth and reduce losses due to parasitism. Therefore, the objective of this study was to evaluate the supplementation with wet brewery residues (WBR) associated with the use of organic modifier and ivermectin for the finishing of beef cattle on pasture. A total of 40 uncastrated steers, averaging 24 months old and 444.6 kg in weight were utilized. The animals were divided in eight treatments (2 × 2 × 2 factorial): animals supplemented or not with 10 kg of WBR, with or without application of organic modifier, with or without application of ivermectin 3.15 g. The animals were kept on 40 ha of Brachiaria brizantha cv. Marandu, managed in rotational stocking. Animals weighing, feces collection and forage sampling were performed every 28 days. There was an interaction effect on the average daily weight gain, with 1.326 kg/animal/d for supplemented and dewormed animals compared to 1.099 kg/animal/d for the non-supplemented and dewormed ones. The effect of ivermectin use on the weight gain of animals was greater in the first 30 days of the experimental period. The use of organic modifier did not affect the weight gain of animals.
Highlights
A pecuária de corte brasileira apresentou nos últimos dez anos um processo crescente de modernização, apesar de ainda caracterizar-se, em grande parte, pela produção extensiva com os animais criados em pasto
the objective of this study was to evaluate the supplementation with wet brewery residues
The animals were divided in eight treatments
Summary
A pecuária de corte brasileira apresentou nos últimos dez anos um processo crescente de modernização, apesar de ainda caracterizar-se, em grande parte, pela produção extensiva com os animais criados em pasto. Os fatores limitantes para o uso do RUC na produção pecuária estão relacionados com a sazonalidade, o transporte e o armazenamento; porém, os subprodutos da indústria cervejeira são altamente poluentes, causando sérios problemas se forem descartados diretamente no ambiente. Esses fármacos são bastante utilizados na região, associados ou não com vermífugos, em casos de debilidade grave e convalescência, principalmente no período menos chuvoso, cuja disponibilidade de pasto é menor; contudo, pouco se sabe sobre os efeitos no ganho efetivo de peso dos animais de corte na Amazônia. O objetivo deste trabalho foi avaliar a terminação de bovinos de corte em pasto na região nordeste do Pará, durante o período de transição águas-seca, com suplementação com resíduo úmido de cervejaria e aplicação de modificador orgânico e ivermectina
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