Abstract:Background:Beef cattle is considered to be one of the most important economic activities, however, it presents problems in the production chain such as the occurrence of parasites that reduce the growth, performance, productivity and may cause mortalities occasionally. The chemical control is the most used alternative to reduce ectoparasites. Nevertheless, inappropriate management of insecticides has contributed to the selection of population resistant to the products available on the market. This paper aimed … Show more
“…Chemical control of horn fly has been pointed out as an essential part of the livestock management, but the farmer lacks guidance in choosing the insecticide used as treatment (Barros et al, 2007;Costa et al, 2016). Besides damaging the environmental the indiscriminate use of insecticides, increases production costs and leas to the accumulation of residues in meat and milk (Rübensam et al, 2013).…”
The horn fly (Haematobia irritans) infestation in the cattle in Brazil leads to significant economic damage for livestock. The efficacy of many essential oils has been demonstrated in the control of veterinary ectoparasites. This study aimed to evaluate the in vitro efficacy of four essential oils to adult horn fly control. The essential oil from Mesosphaerum suaveolens (L.) Kuntze (Lamiaceae) was extracted by hydro-distillation, while that the water steam distillation method was used to extract the essential oils from Varronia curassavica (Jacq.) Roem. & Schult. (Boraginaceae), Alpinia zerumbet (Pers.) B.L. Burtt & R.M. Sm. (Zingiberaceae) and Psidium guajava L. (Myrtaceae). Afterwards, all the essential oils were analyzed by Gas Chromatography Mass Spectrometry (GC?MS) and Flame Ionization Detector (GC-FID) for determination of their chemical composition. The bioassays in vitro were performed according to the impregnated filter paper methodology. All the essential oils evaluated in this study exhibited efficacy in vitro against H. irritans. The highest mortality of H. irritans was determined by essential oils from A. zerumbet (100%) and M. suaveolens (96.2%) at 50 mg mL-1. In concentration of 100 mg mL-1 V. curassavica and P. guajava essential oils caused the mortality of 99.2% and 82.8%, respectively. The A. zerumbet, M. suaveolens, V. curassavica and P. guajava essential oils showed in vitro efficacy against H. irritans. Further studies with associations and nanoemultions are necessary to increase the efficacy and stability of these essential oils on field conditions.
“…Chemical control of horn fly has been pointed out as an essential part of the livestock management, but the farmer lacks guidance in choosing the insecticide used as treatment (Barros et al, 2007;Costa et al, 2016). Besides damaging the environmental the indiscriminate use of insecticides, increases production costs and leas to the accumulation of residues in meat and milk (Rübensam et al, 2013).…”
The horn fly (Haematobia irritans) infestation in the cattle in Brazil leads to significant economic damage for livestock. The efficacy of many essential oils has been demonstrated in the control of veterinary ectoparasites. This study aimed to evaluate the in vitro efficacy of four essential oils to adult horn fly control. The essential oil from Mesosphaerum suaveolens (L.) Kuntze (Lamiaceae) was extracted by hydro-distillation, while that the water steam distillation method was used to extract the essential oils from Varronia curassavica (Jacq.) Roem. & Schult. (Boraginaceae), Alpinia zerumbet (Pers.) B.L. Burtt & R.M. Sm. (Zingiberaceae) and Psidium guajava L. (Myrtaceae). Afterwards, all the essential oils were analyzed by Gas Chromatography Mass Spectrometry (GC?MS) and Flame Ionization Detector (GC-FID) for determination of their chemical composition. The bioassays in vitro were performed according to the impregnated filter paper methodology. All the essential oils evaluated in this study exhibited efficacy in vitro against H. irritans. The highest mortality of H. irritans was determined by essential oils from A. zerumbet (100%) and M. suaveolens (96.2%) at 50 mg mL-1. In concentration of 100 mg mL-1 V. curassavica and P. guajava essential oils caused the mortality of 99.2% and 82.8%, respectively. The A. zerumbet, M. suaveolens, V. curassavica and P. guajava essential oils showed in vitro efficacy against H. irritans. Further studies with associations and nanoemultions are necessary to increase the efficacy and stability of these essential oils on field conditions.
“…The Brazil is the country with the largest commercial cattle herd in the world, being the largest exporter in the world. The production of milk and meat is promising and characterized as one of the agribusinesses that boost the country's economy (COSTA et al, 2016). The gross production value of these two segments is estimated at R $ 67 billion, in all Brazilian states, that shows the economic and social importance of this activity in the country (ARAÚJO, 2007).…”
Section: Introduction and Literature Reviewmentioning
The rural extension is a technical activity that aims at an educational and instructive character in assisted properties, especially for small and medium rural dairy farmers. In this way, among other factors, it aims to maintain the welfare and health of the animals involved and also to produce subsistence with the activity. Given the importance of dairy farming in Brazil and the various difficulties encountered in this sector, this work aims to report the performance and importance of the "Rural Extension-Dairy Cattle" Project of the Professional Improvement Program in Veterinary Medicine at the University of Franca (UNIFRAN). This extension project, created in 2012, in addition to improving the knowledge of recently graduated academics, provides veterinary technical assistance to small rural dairy farmers in the city of Franca (SP) and region, especially in relation to the processes that involve the handling, welfare, nutrition, production, reproduction and health of the animals. Each selected student develops these activities for two consecutive years, under the constant supervision and guidance of the institution's faculty, in addition to the assistance of interns. Thus, using the rural extension methodology recommended by the "Rural Extension-Dairy Cattle" Project, It is admitted that it provides the intensive improvement of the veterinarian for being directly inserted in the current job market, in addition to offering instructions to rural producers followed by animal care, which favors the productivity and quality of the product obtained.
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