Helmintoses gastrintestinais e desenvolvimento ponderal de bovinos em pastejo rotacionado sob sistema silvipastoril e tradicional

• Ano de defesa: 2009
• Autor(a) principal: Rodrigo Martins Alves de Mendonca
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Minas Gerais; UFMG
• Palavras-chave em Português: silvipastoril; carga parasitária; OPG; pastejo rotacionado; tradicional; coprocultura; nematóides; bovino; Infecções por nematóides; Bovino Pesos e medidas; Bovino Parasito; Parasitismo
• Link de acesso: http://hdl.handle.net/1843/SSLA-7UZJ6H

During six months of the Brazilian Spring and summer (August to January), 96 crossbreeds Holstein x Zebu bovine females and four bovine male trackers, with 8 to 24 months of age and weighting 112 to 362 kg, were divided into two groups in a rotational grazing system. Each area was divided into four paddocks with similar size and rotated in average with 10 days grazing and 30 days resting period. One group, with 56 heads, was chosen randomly and put to graze in a 35 hectares (ha) silvopastoral area divided into four paddocks and the other group with 44 bovines grazed in a 25 ha traditional area with a few trees also divided into four paddocks. The number of animals in each group varied in order to balance the stocking rate of the different areas. The initial stocking rate in the silvopastoral area was 350 kg/ha and 368 kg/ha in the traditional area. At the end of the experiment the stocking rates raised to 389 and 400 kg for the silvopastoral and traditional areas, respectively. These animals were monthly weighed and had their feces directed collected individually in order to analyze the weight gain and examined the eggs of nematodes per gram of feces (EPG). The infective nematode larvaes were, then, identified after coproculture. There was no significant difference between weights, weight gains and EPG between animals that were grazed in the silvopastoral area and those that grazed the traditional area. The average weights varied from 221 to 259 kg and the average weight gain was 244g/animal/day from august 2008 to January 2009. The average EPG during the experiment was 191 eggs/g. It reached the top medium count in November of 2008 with 363 EPG. Haemonchus sp. was the main genus identified in the coprocultures and varied from 76 to 91% in the silvopastoral area and 73 to 94% in the traditional area. After the slaughter of the tracker male bovine, gastrointestinal nematode parasites were counted and identified specifically. The counts varied from 1.330 to 1.930 and 1.290 to 3.370 of Haemonchus placei, from 0 to 370 and from 0 to 230 Cooperia punctata, and from 60 to 230 and from 30 to 190 Oesophagostomum radiatum in the areas silvopastoral and traditional, respectively. The silvopastoral area did not increase the parasitic burden in growing animals and did not interfere in weight gain