Thesis (MSc. (Veterinary Production and Ethology))--University of Pretoria, 2000. / Also available in print format.

Thesis (Ph.D.)--University of Florida, 2004. / Typescript. Title from title page of source document. Document formatted into pages; contains 143 pages. Includes Vita. Includes bibliographical references.

Diss. (sammanfattning) Stockholm : Karol. inst., 2003. / Härtill 4 uppsatser.

A cohort study was conducted in order to measure the effect of the chronic indurative lymphocytic mastitis caused by the South African strain ofMaedi visna virus (SA-OMVV) on the pre-weaning growth of lambs born of naturally infected and uninfected ewes kept under similar conditions. 50 naturally infected ewes and 40 controls from an MVV-free source were purchased and kept separately. All ewes were of the same breed - the Dorper¬and 3 to 4 years old. From the adaptation period, through mating, pregnancy and lactation periods they were monitored for MVV antibodies and managed under similar conditions. The lambs were weighed at birth and thereafter every two weeks until the age of 90 days, when they were weaned. The ewes were slaughtered, their udders examined histologically and the lesions were assessed by counting typical lymphocytic follicles. Although the observed values indicated a correlation between the number of follicles in the udder and the reduction in the growth rate of the lambs, this was not statistically significant. Similarly, despite higher counts of lymphoid follicles in the udder of sero-positive ewes as compared to sero-negatives and the observed lower ewe productivity indexes (EPI) in infected ewes, no statistically significant differences were found in the EPI of ewes in different follicle categories. The present study was a first attempt to evaluate the effect of the SA-OMVV infection on sheep productivity in South Africa. / Dissertation (MSc)--University of Pretoria, 2000. / Production Animal Studies / Unrestricted

Submitted by Jefferson Filgueira Alcindo (jefferson.alcindo@yahoo.com.br) on 2018-04-18T19:55:54Z No. of bitstreams: 1 Tese doutorado Jefferson.pdf: 1217923 bytes, checksum: 08592edaa8bb1967844d2d8dd8a6ae88 (MD5) / Approved for entry into archive by Isabel Pereira de Matos (isabel@fmva.unesp.br) on 2018-04-19T13:33:02Z (GMT) No. of bitstreams: 1 alcindo_jf_dr_araca_int.pdf: 1217923 bytes, checksum: 08592edaa8bb1967844d2d8dd8a6ae88 (MD5) / Made available in DSpace on 2018-04-19T13:33:02Z (GMT). No. of bitstreams: 1 alcindo_jf_dr_araca_int.pdf: 1217923 bytes, checksum: 08592edaa8bb1967844d2d8dd8a6ae88 (MD5) Previous issue date: 2018-04-04 / Esse trabalho teve como objetivo avaliar, em um rebanho com presença de animais com sinais clínicos da enfermidade, a aplicabilidade e eficácia das medidas de controle para a atrite-encefalite caprina e perdas produtivas associadas. Os animais foram testados sorologicamente e algumas medidas de controle foram instituídas, entre elas: segregação dos rebanhos (positivo e negativo), retirada dos cabritos ao nascimento, aleitamento dos neonatos com colostro/leite de vaca ou de cabra tratados termicamente, linha de ordenha e manejo reprodutivo de acordo com status sorológico e descarte orientado de animais reagentes. Dados produtivos tais quais produção de leite, taxa de prenhez, peso dos animais adultos e crias, taxa de morbidade, mortalidade e descarte foram avaliados. Os custos relacionados à implantação do programa e perdas associadas à produtividade também foram analisados. A soroprevalência da doença decresceu a partir da segunda sorologia, atingindo a menor taxa na quarta sorologia (40,54%) e voltando a aumentar no final do estudo (50,72%). Animais soropositivos e com duas lactações produziram 0,26 litros a menos de leite diariamente quando comparados aos animais soronegativos. O peso das crias ao nascimento também foi menor em animais que provinham de mães sororeagentes. Conclui-se que as medidas de controle são aplicáveis em rebanhos comerciais, entretanto possuem sérias implicações quanto a sua eficácia em rebanhos com soroprevalência intermediária e alta, contribuindo pouco para a redução de novos casos. O impacto produtivo refletiu-se, principalmente, na produção de leite e o custo para implantação do programa de controle foi elevado. / The objective of this study was to evaluate the application and efficacy of control measures for caprine arthritis encephalitis and associated productive losses in a herd with the presence of animals with clinical signs of the disease. The animals were tested serologically and some control measures were instituted, including: segregation of herds (positive and negative), removal of goats at birth, suckling of newborns with colostrum / cow's milk or thermally treated goat's milk, management line and reproductive management according to serological status and discarded oriented of reactive animals. Productive data such pregnancy rate, adult and calf weight, mortality rate, mortality and discards. Costs related to program implementation and losses associated with productivity were also analyzed. The seroprevalence of the disease decreased after the second serology, with a lower rate in the fourth serology (40.54%) and increasing again at the end of the study (50.72%). Seropositive animals with two lactations produced 0.26 liters less milk daily when compared to seronegative animals. The weight of the offspring at birth was also lower in animals that came from mothers who were seroreagentes. It is concluded that control measures are approached, such as their efficacy in herds with intermediate and high seroprevalence, contributing little to a reduction of new cases. The productive impact was mainly reflected in milk production and in the cost to implement the high-level control program

Orientador: Francisco Leydson Formiga Feitosa / Banca: Luiz Claudio Nogueira Mendes / Banca: Iveraldo dos Santos Dutra / Banca: Sara Vilar Dantas Simões / Banca: Josir Laine Aparecida Veschi / Resumo: Esse trabalho teve como objetivo avaliar, em um rebanho com presença de animais com sinais clínicos da enfermidade, a aplicabilidade e eficácia das medidas de controle para a atrite-encefalite caprina e perdas produtivas associadas. Os animais foram testados sorologicamente e algumas medidas de controle foram instituídas, entre elas: segregação dos rebanhos (positivo e negativo), retirada dos cabritos ao nascimento, aleitamento dos neonatos com colostro/leite de vaca ou de cabra tratados termicamente, linha de ordenha e manejo reprodutivo de acordo com status sorológico e descarte orientado de animais reagentes. Dados produtivos tais quais produção de leite, taxa de prenhez, peso dos animais adultos e crias, taxa de morbidade, mortalidade e descarte foram avaliados. Os custos relacionados à implantação do programa e perdas associadas à produtividade também foram analisados. A soroprevalência da doença decresceu a partir da segunda sorologia, atingindo a menor taxa na quarta sorologia (40,54%) e voltando a aumentar no final do estudo (50,72%). Animais soropositivos e com duas lactações produziram 0,26 litros a menos de leite diariamente quando comparados aos animais soronegativos. O peso das crias ao nascimento também foi menor em animais que provinham de mães sororeagentes. Conclui-se que as medidas de controle são aplicáveis em rebanhos comerciais, entretanto possuem sérias implicações quanto a sua eficácia em rebanhos com soroprevalência intermediária e alta, contribuindo p... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: The objective of this study was to evaluate the application and efficacy of control measures for caprine arthritis encephalitis and associated productive losses in a herd with the presence of animals with clinical signs of the disease. The animals were tested serologically and some control measures were instituted, including: segregation of herds (positive and negative), removal of goats at birth, suckling of newborns with colostrum / cow's milk or thermally treated goat's milk, management line and reproductive management according to serological status and discarded oriented of reactive animals. Productive data such pregnancy rate, adult and calf weight, mortality rate, mortality and discards. Costs related to program implementation and losses associated with productivity were also analyzed. The seroprevalence of the disease decreased after the second serology, with a lower rate in the fourth serology (40.54%) and increasing again at the end of the study (50.72%). Seropositive animals with two lactations produced 0.26 liters less milk daily when compared to seronegative animals. The weight of the offspring at birth was also lower in animals that came from mothers who were seroreagentes. It is concluded that control measures are approached, such as their efficacy in herds with intermediate and high seroprevalence, contributing little to a reduction of new cases. The productive impact was mainly reflected in milk production and in the cost to implement the high-level control p... (Complete abstract click electronic access below) / Doutor