Veda e vermifugação como alternativas de manejo para desmama de bezerros Nelore em pastagem nativa do Pantanal

Abstract

RESUMO -Entre março de 1992 e janeiro de 1993 realizou-se este estudo com o objetivo de avaliar o efeito integrado da veda do pasto nativo com o controle estratégico de nematóides gastrintestinais no desempenho corporal de bezerros Nelore pós-desmame no Pantanal da Nhecolândia, MS, Brasil. Dois lotes de animais recém-desmamados aos nove meses foram colocados em invernadas contíguas de pastagens nativas com as mesmas características fisionômicas, que foram vedadas por três meses e meio; a invernada do lote controle foi previamente pastejada por vacas com bezerro ao pé para contaminação. O lote tratado permaneceu com níveis muito baixos de ovos por grama de fezes durante todo o período experimental, e no lote controle foram diminuindo no decorrer do ensaio, terminando semelhantes. No desenvolvimento corporal, observou-se menor perda de peso do lote tratado durante a estação seca e ganho de peso compensatório do lote controle na estação chuvosa subseqüente. Os pesos médios dos dois lotes no final do experimento foram semelhantes.Termos para indexação: controle de nematóides, helmintoses, gado de corte, melhoramento de pastagem, alimentação animal. ALTERNATIVE MANAGEMENT FOR WEANED NELORE CALVES IN THE PANTANAL'S NATIVE PASTURESABSTRACT -The aim of this study was to investigate the integrated effects of native pastures sealing with strategic control of gastrointestinal nematodes on body development of weaned Nellore calves, studied between March 1992 and January 1993 in the Pantanal region, Brazil. Two homogeneous groups of weanling calves were put on contiguous paddocks of native pastures with the same physiognomic characteristics and sealed for three and a half months. The paddock where the non-treated group was put, was previously used by cows that were rearing a calf for contamination of the pasture. The treated group remained with low levels of eggs per gram of feces (EGF) during the whole experimental period. In the non-treated group, the EGF diminished during the assay, ending with similar levels of the treated group. On body development, it was observed a lower body weight loss of the treated group during the dry season and a compensatory weight gain of the non-treated group on the subsequent rainy season. The mean body weight of the two groups was similar at the end of the trial.

Gastrointestinal nematode infections do not hinder the development of Simmental X Nellore crossbred calves raised with a nutritionally enhanced diet

“…Later, in Central Brazil, young treated cattle showed higher gains in body weight than untreated controls in the states of Mato Grosso do Sul (Bianchin et al, 1995(Bianchin et al, , 2007Borges et al, 2013;Catto et al, 2013;Heckler et al, 2016), Minas Gerais (Furlong et al, 1993;Guimarães et al, 2000;Lima et al, 1985;1997), and São Paulo (Oliveira & Freitas, 1998;Soutello, 2001). In contrast, no difference was found between treated and untreated cattle in the Pantanal region of Mato Grosso do Sul (Catto & Furlong, 1982;Catto et al, 1993;Sereno et al, 2000) and in São Paulo (Santos et al, 1977). According to the above cited authors, the anthelmintics used in the experiments published before 1985 were benzimidazoles and imidazothiazoles (tetramisole and levamisole).…”