Controle dos Helmintos gastrintestinais em bovinos jovens

• Autor(a) principal: Silva, Delcacio Joaquim da
• Data de Publicação: 1984
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UFRRJ
• Texto Completo: https://tede.ufrrj.br/jspui/handle/jspui/3964
• topic: Medicina Veterin?ria; Medicina Veterin?ria

The exgeriment was carried out at the Esta??o Experimental de Zootecnia de Pindamonhangaba, SP, from the October 1982 until October 1983. Calves of the breed "Mantiqueira" were used comencing between 124 and 142 days of age. A random block protocol was used with three treatments and seven replicates from the beginning of the experiment until Juin 1983 and with 6 replicates from July 1983, until the end of the experimental period. Treatment "A" was the control group; treatment "B" received anthelmintic treatments in July and November, while treatment "C" consisted of anthelmintic treatments when the rains began in November, followed by two more treatments at 21 days intervals. Three fields were used of 0.5ha each separated by double fences, and sown with Brachyaria decumbens. A supplement was given to all animals, with a crude protein content of 18.25%. The anthelminthic used contained albendazole for oral application. The analyses of variance for weight gains showed no significant differences between the three treatments. An analy- xvii sis of the faecal egg counts (OPG) showed that there was less infection in the groups treated with anthelminthic. Analyses of the correlation between the number of larvae recovered with larvaculture and white blood cell counts showed some positive results. The number of neutrophils and small lymphocytes was negatively correlated with the genera Haemonchus, Cooperia and Oesophagostomum. The number of eosinophils showed a positive correlation with the number of Haemonchus and Oesophagostomum. Adequate supplements, the initial age of the animals used and the date when these started on pasture all influenced markedly the reduction of parasitism and the increase in immunity.