Efeitos da everminação de matrizes e de bezerros lactentes em sistema de produção de bovinos de corte na região de Cerrado

Catto, J. B.; Bianchin, I.; Torres, Roberto Augusto de Almeida

doi:10.1590/s0100-736x2005000300010

Cited by 8 publications

(10 citation statements)

References 7 publications

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“…Males who received CS+AT gained, on average, 7.5 kg more than the animals that received only CS, and the calves receiving PS+AT gained on average 5.5 kg more than the animals that received only PS. These data are also close to the results found by Catto et al (2005), in which males treated with long-acting anthelmintic gained from 2.5 to 11.7 kg (average 6.8kg) more than the control group animals, treated from lactation until weaning.…”

Section: Resultssupporting

confidence: 90%

“…Heifers fed with PS+AT gained, on average, 3.9 kg more than animals that received only PS. The results are in the same data range found by Catto et al (2005) in which females treated with long-acting anthelmintic have a weight variation from -1.6 to 9.7 kg (average 6.5kg) more than animals that received no anthelmintic treatment, treated from lactation (3-5 months old) until weaning.…”

Section: Resultssupporting

confidence: 87%

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Anthelmintic treatment and supplementation in Nellore calves performance in the post-weaning period

Fachiolli

Saes

Dellaqua

et al. 2017

SCA

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The objective of this study was to analyze the effects of anthelmintic treatment and supplementation of post-weaning Nellore calves. The parasitism degree, hematological changes and animal performance were analyzed, as well as the financial viability. One hundred contemporary Nellore calves were used. Animals were divided into four groups: CS+AT: supplementation with concentrate and anthelmintic treatment; CS: supplementation with concentrate; PS+AT: protein mineral supplementation and anthelmintic treatment; PS: protein mineral supplementation. Coproparasitological, hematological, and cost examinations were performed, and productive performance was also evaluated. A completely randomized design was used. Animals that received CS+AT showed greater weight gain. In females, there was significant difference in egg counts per gram of feces only between the CS and PS+AT. In males, animals receiving CS+AT, CS, and PS+AT differ from those receiving PS. No significant effects were observed for total plasma protein, packed cell volume, and eosinophils count. Females which received PS+AT and males who received CS+AT showed higher profitability. This study concludes that effective anthelmintic use is still viable, with higher profitability associated with concentrated supplementation in males, and mineral protein supplementation in females. Male calves show better return over investment when compared to females, due to the higher market value and higher potential performance.

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Section: Resultssupporting

confidence: 90%

Section: Resultssupporting

confidence: 87%

Anthelmintic treatment and supplementation in Nellore calves performance in the post-weaning period

Fachiolli

Saes

Dellaqua

et al. 2017

SCA

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“…A exemplo disso, Catto et al (2005) detectaram menor prevalência das infecções, menor média de OPG e maior ganho de peso em bezerros tratados com IVM 3,15% LA em comparação a bezerros tratados com IVM 1%, devendo-se ressaltar que essas diferenças puderam ser constatadas em um período observacional mais longo (dos 3 a 5 meses ao desmame). Porém, no presente estudo, a ação dessa maior persistência das formulações LA no controle da re-infecção parasitária não pôde ser quantificada, o que se deveu à baixa eficácia destes fármacos no rebanho utilizado.…”

Section: Quadro 2 Representatividade De Larvas Infectantes (L3) Recuunclassified

“…Há correlação positiva entre a dose administrada e a concentração plasmática de LMs em bovinos (Lanusse & Prichard 1993, van Zeveren et al 2007) e alguns estudos indicam que a aplicação de LMs de alta concentração com longa ação (LA) e em associação pode aumentar a eficiência dos tratamentos (Dobson et al 1996, Catto et al 2005, Yazwinski et al 2006, Borges et al 2008. Além disso, na seleção experimental de nematódeos resistentes a LMs, a partir de cepas originalmente susceptíveis, em geral, é necessária a aplicação de uma subdose para desencadear o processo de seleção, a qual é aumentada gradativamente, sobre subseqüentes gerações do parasita, até obterem-se cepas resistentes à dose terapêutica do princípio ativo (Ranjan et al 2002, van Zeveren et al 2007).…”

Section: Introductionunclassified

Ação anti-helmíntica de diferentes formulações de lactonas macrocíclicas em cepas resistentes de nematódeos de bovinos

et al. 2010

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523Pesq. Vet. Bras. 30(7):523-528, julho 2010 RESUMO.-As lactonas macrocíclicas (LMs) (avermectinas e milbemicinas) são endectocidas amplamente utilizados em animais e em algumas parasitoses humanas. Em bovinos, a resistência parasitária às LMs é emergente, e o surgimento de formulações que diferem nas suas propriedades farmacológicas tornou complexa a escolha da droga mais indicada a cada caso. Com o objetivo de avaliar possí-veis alternativas para recuperar a eficácia de LMs sobre cepas resistentes de nematódeos gastrintestinais, testaram-se, neste estudo, dez diferentes tratamentos a base de LMs sobre uma população de nematódeos gastrintestinais de bovinos a qual, sabidamente, sofrera pressão de seleção por avermectinas a 1%. Adicionalmente, testou-se um benzimidazol. A eficácia das drogas foi calculada com base na redução de ovos por grama de fezes (OPG) dos bovinos. A resistência de cada gênero foi avaliada por meio de identificação de larvas, obtidas de cultivos nas fezes, pré-e pós-tratamentos. Não se obteve a eficácia desejada com o emprego de avermectinas The macrocyclic lactones (MLs) (avermectins and milbemycins) are endectocides broadly used in livestock and in some parasitic diseases of humans. In cattle, parasite resistance to MLs is emerging, and the appearance of formulations that differ in their pharmacological properties become complex the choice of the most appropriate drug to each case. In order to evaluate possible alternatives to restore the effectiveness of MLs on resistant strains of gastrointestinal nematodes, were tested, in this study, ten different treatments based on the MLs on a population of gastrointestinal nematodes of cattle which, known, was under pressure of selection by 1% avermectins. Additionally, was tested a benzimidazole. The efficacy of the drugs was calculated with basis on the reduction of eggs per gram of feces (EPG) of cattle. The resistance of each genus was evaluated by identification of the larvae, obtained from culture in the feces, pre-and post-treatments. The desired efficacy was not obtained using long action avermectins -with high concentration and in association -even with the application of high doses. The genera Cooperia spp., Haemonchus spp. and Trichostrongylus spp. were resistant to avermectins, and Ostertagia spp. to ivermectin. It was observed that, once established parasite resistance to the 1% MLs, the application of drugs, of this same chemical group, even in formulations of high concentration, association or in high doses, may not result in the expected efficacy.

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“…Under tropical conditions, the treatment of preweaning calves and cows during the suckling period was evaluated by Catto et al (2005), who did not observe any effect of the treatment of cows on the weight of the calves; however, the calves treated at 4-5 months of age showed greater weight gain. In this study, ivermectin (IVM) was used, and the effect of a conventional formulation was also compared to that of a long-acting (IVM-LA) agent, noting that only IVM-LA resulted in an average increase in weight gain in calves of 7.1 kg compared to the control group.…”

Section: Introductionmentioning

confidence: 99%

Long-Acting Moxidectin for the Control of Gastrointestinal Nematodes in Preweaned Beef Calves in Tropical Areas

Reckziegel

Conde

Freitas

et al. 2021

JAS

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Gastrointestinal nematodes (GINs) in beef calves in the preweaning period can be an underestimated problem, and an adequate control program can result in increased productivity. In the current scenario of anthelmintic resistance, clinical studies with highly effective molecules with a prolonged period of action can contribute to the development of technologies applied in the field. The objective of this study was to evaluate the effects of a 10% moxidectin formulation (10%MOX), administered to calves aged 4–5 months, in the control of gastrointestinal nematodes and weight gain until the time of weaning. The study was divided into 2 stages. The first stage was carried out on a farm, with a randomized block design based on fecal egg counts (FEC), live weight, number of calvings of the mother, breed of the calves, and pickets. In the second stage, the study was repeated on 10 other farms, following a completely randomized design, to confirm the results obtained in the first stage. In all experiments there was a treated group and a placebo group. In the first stage, the effectiveness of 10%MOX in the FECRT performed on the 38th day post-treatment was 98.49%, and the treated animals still had lower FEC averages and a 9.4 kg increase in weight at weaning compared to those from the placebo group. In the second stage, the average increase in weight gain was 6.1 kg, confirming the results of the first stage. The study demonstrated effective control of GINs and improvement in the productive performance of calves treated in the preweaning phase, using 10% moxidectin.

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Efeitos da everminação de matrizes e de bezerros lactentes em sistema de produção de bovinos de corte na região de Cerrado

Cited by 8 publications

References 7 publications

Anthelmintic treatment and supplementation in Nellore calves performance in the post-weaning period

Anthelmintic treatment and supplementation in Nellore calves performance in the post-weaning period

Ação anti-helmíntica de diferentes formulações de lactonas macrocíclicas em cepas resistentes de nematódeos de bovinos

Long-Acting Moxidectin for the Control of Gastrointestinal Nematodes in Preweaned Beef Calves in Tropical Areas

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