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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Mi?ases Umbilicais em Bezerros Nelore Rec?m-Nascidos: Predisposi??o de Dois Cruzamentos Raciais Criados no Sistema de Manejo Voisin no Rio de Janeiro e Avalia??o de Medidas Profil?ticas em Cria??o Extensiva no Pantanal Sul-Mato-Grossense. / Umbilical Myiasis in Nelore Newborn Calves: Predisposition of Two Racial Crossings Raised in a Voisin System in Rio de Janeiro and Evaluation of Prophylactic Measures in Extensive Cattle Raising in the Pantanal Sul-Mato-Grossense.

Pires, Marcus Sandes 22 August 2008 (has links)
Made available in DSpace on 2016-04-28T20:15:31Z (GMT). No. of bitstreams: 1 2008 - Marcus Sandes Pires.pdf: 1303739 bytes, checksum: ba892d4fd06f63ff7ccf700bb5396825 (MD5) Previous issue date: 2008-08-22 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / The research was done in two distinct properties of beef cattle raising. The first part of the experiment was executed in Santo Ant?nio Farm, located in Miguel Pereira city, Rio de Janeiro State, with the objective of evaluating the susceptibility and the prevalence of umbilical myiasis in the newborn calves, resultant of the crossings between Brahma pure breed bulls and 5/8 Canchim cows x 3/8 Nelore and the crossings between Nelore pure breed bulls and 5/8 Canchim/Nelore cows x 3/8 Nelore. A descriptive study with observation of the prevalence of umbilical myiasis was carried out after calves birth, in accordance with the racial origins and gender of these animals, from august to november 2006. Each matrices group, composed of 130 females, among cows, heifers, and 10 bulls of same racial origin (Nelore and Brahman), placed in 40 poles, having each one of these, two to three hectares, using the Voisin rotation system. The animals remained approximately 24 hours in each pole, after that, they had to avoid the pasture for one month. the second part of the experiment was carried out in Alegria Farm, located in Corumb? city, State of Mato Grosso do Sul, with the objective of evaluating the efficacy of medicines, to do so, were used four separated pastures of 850 hectares, containing 350 cows, approximately, and the newborn calves of these groups, were treated with the medication chosen for each of the separated pastures. The medicines used were: doramectin 200 &#956;g/kg l.w., ivermectin 200 &#956;g/kg l.w., ivermectin long action 200 &#956;g/kg l.w., all, subcutaneously injected and solution of DDVP (2.2-dichlor-vinyl-dimethyl-phosphat or dichlorvos) plus triclorfon, with topic application in the umbilical area. After the elective application of the medicines in each group, it was possible to detect the prevalence of umbilical myiasis in the animals. The monitoring of the calves in the two properties was done until one month after the birth, for new evaluation of possible occurrences of umbilical myiasis. In the first part of the experiment, from 152 newborn calves41,33% of umbilical myiasis, and 77, derived from the crossing between Brahman x 5/8 Canchim/Nelore, 75 were derived from the crossing between Nelore x 5/8 Canchim/Nelore with a prevalence of 54,55%, of umbilical myiasis, not being evidenced significant difference (p>0.05). From the total of umbilical myiasis observed, 52,02% occurred in male and 47,95% in females. In the second experimental part, from 613 calves preventively treated, 24 cases of umbilical myiasis were detected, mostly in the period of heavier rains and higher temperatures. There was a significant difference (p<0.05) in the use of doramectin, ivermectin, and ivermectin long action, subcutaneously application in relation to the topic solution of DDVP + triclorfon like preventive medication to the umbilical myiasi. There was no statistical difference (p>0.05) among the avermectins used in the study, in the prevention of umbilical myiasis. / A pesquisa foi realizada em duas propriedades distintas de cria??o de bovino de corte. A primeira parte do experimento foi executada na Fazenda Santo Antonio, localizada no munic?pio de Miguel Pereira, Estado do Rio de Janeiro tendo como objetivo avaliar a suscetibilidade e a preval?ncia de mi?ases umbilicais nos bezerros rec?m-nascidos, resultantes dos cruzamentos entre touros Brahman P.O (puro de origem) e vacas 5/8 Canchim x 3/8 Nelore e os cruzamentos entre touros Nelore P.O e vacas 5/8 Canchim x 3/8 Nelore. Foi realizado um levantamento observacional descritivo da preval?ncia de mi?ases umbilicais ap?s o nascimento dos bezerros, de acordo com as origens raciais e sexo desses animais, no per?odo de agosto a novembro de 2006. Cada grupo das matrizes, composta por 130 f?meas, entre vacas, novilhas, e 10 touros da mesma origem racial (Nelore e Brahman), alocados em 40 piquetes, tendo cada um desses, de dois a tr?s hectares, utilizando-se o sistema de manejo rotacionado Voisin. Os animais permaneciam em m?dia 24 horas em cada piquete, sendo o per?odo de descanso da pastagem de um m?s. A segunda parte do experimento foi realizada na Fazenda Alegria, localizada no munic?pio de Corumb?, Estado de Mato Grosso do Sul, tendo como objetivo avaliar a efic?cia de medicamentos na preven??o de mi?ases umbilicais em bezerros da ra?a Nelore de cria??o extensiva, nascidos de dezembro de 2006 a mar?o de 2007. Para a avalia??o da efic?cia dos medicamentos, foram utilizadas quatro invernadas de 850 hectares, contendo 350 vacas, em m?dia, e os bezerros rec?m-nascidos desses grupos, tratados com a medica??o de escolha de cada invernada. Os medicamentos utilizados foram: doramectina 200 &#956;g/kg p.v.a., ivermectina 200 &#956;g/kg p.v.a., ivermectina longa a??o 200 &#956;g/kg p.v.a., todos, via parenteral (subcut?nea) e solu??o de DDVP (2,2 diclorovinil dimetil fosfato ou diclorv?s) + triclorfon, com aplica??o t?pica na regi?o umbilical. Ap?s a aplica??o eletiva dos medicamentos em cada grupo, realizou-se a avalia??o da preval?ncia das mi?ases umbilicais nos animais. O monitoramento dos bezerros nas duas propriedades foi at? um m?s p?s-nascimentos, para reavalia??o de poss?veis ocorr?ncias de mi?ases umbilicais. Na primeira parte do experimento, dos 152 bezerros rec?m-nascidos, 75 foram oriundos do cruzamento entre Nelore x 5/8 Canchim/Nelore com uma preval?ncia de 41,33% de mi?ases umbilicais, e 77, oriundos do cruzamento entre Brahman x 5/8Canchim/Nelore constatou-se uma preval?ncia de 54,55% ,de mi?ases umbilicais, n?o sendo evidenciado diferen?a significativa (p>0,05) entre os cruzamentos. Em rela??o ao sexo dos animais, n?o houve diferen?a significativa (p>0,05). Do total de mi?ases umbilicais observadas, 52,05% ocorreram em machos e 47,95% em f?meas. Na segunda parte experimental, dos 613 bezerros medicados preventivamente, constatou-se 24 casos de mi?ases umbilicais, com predomin?ncia de ocorr?ncias na ?poca mais quente e de maior ?ndice de precipita??o pluviom?trica do per?odo observado. Houve diferen?a significativa (p<0,05) na utiliza??o de doramectina, ivermectina e ivermectina longa a??o, aplicadas via sub-cut?nea em rela??o ? solu??o t?pica de DDVP + triclorfon como medica??o preventiva ? mi?ase umbilical. N?o houve diferen?a significativa (p>0,05) entre as avermectinas utilizadas no estudo, na preven??o de mi?ases umbilicais.

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