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Pentastomid parasites of the family Sebekidae Fain, 1961 in West African dwarf crocodiles Osteolaemus tetraspis Cope, 1851 from the Congo, with a description of Alofia parva n. sp.
1995
Riley, J. (The Univ., Dundee, Scotland (United Kingdom). Dept. of Biological Sciences) | Huchzermeyer, F.W.
The distribution of Pasteurella haemolytica serotypes among cattle, sheep and goats in South Africa and their association with disease
1995
Odendaal, M.W. (Agricultural Research Council, Onderstepoort (South Africa). Onderstepoort Veterinary Inst.) | Henton, M.M.
Detection of bovine-virus-diarrhoea-virus antibodies in cattle with an enzyme-linked immunosorbent assay
1995
Muvavarirwa, P. | Mudenge, D. | Moyo, D. | Javangwe, S. (Zimbabwe Univ., Harare (Zimbabwe). Dept. of Paraclinical Veterinary Studies)
Immunohistochemical identification of Cowdria ruminantium in formalin-fixed tissue sections from mice, sheep, cattle and goats
1995
Jardine, J.E. (Pretoria Univ., Onderstepoort (South Africa). Dept. of Pathology) | Vogel, S.W. | Van Kleef, M. | Van der Lugt, J.J
Detection of bluetongue virus and African horsesickness virus in co-infected cell cultures with NS1 gene probes
1995
Venter, E.H. (Pretoria Univ., Onderstepoort (South Africa). Dept. of Veterinary and Tropical Diseases) | Huismans, H. | Van Dijk, A.A.
Epidemiology of African horsesickness: Antibodies in free-living elephants (Loxodonta africana) and their response to experimental infection
1995
Barnard, B.J.H. (Agricultural Research Council, Onderstepoort (South Africa). Onderstepoort Veterinary Inst.) | Bengis, R.G. | Keet, D.F. | Dekker, E.H.
Effects of transformation on the hemagglutinins of Haemophilus paragallinarum
1995
Bragg, R.R. | Purdan, G. | Coetzee, L. (Pretoria Univ., Onderstepoort (South Africa). Dept. of Poultry Diseases) | Verschoor, J.A.
The skull and mandible of the African elephant (Loxodonta africana)
1995
Van der Merwe, N.J. | Bezuidenhout, A.J. | Seegers, C.D. (Pretoria Univ., Onderstepoort (South Africa). Dept. of Anatomy)
Winter environmental effects on dry-matter intake of stabled and unsheltered holstein cows | Efeitos ambientais de inverno sobre o consumo de matéria seca por vacas holandesas estabuladas e vacas holandesas desabrigadas Texte intégral
1995
Antonio Cesar Alves Fagundes | Pedro Bernardo Muller | Anibal de Sant’Anna Moretti
The purpose of this study was to verify the association of environment and feed intake and also to measure the variation on dry-matter intake of stabled and unsheltered holstein cows, as a function of temperature decrease, during the winter in humid subtropical climate. The experiment was developed in Santa Maria, State of Rio Grande do Sul, Brazil, during July and August, 1986. There were used 12 Holstein cows with ration based on corn silage fed for "ad libitum" consumption, distributed in two sets: stabled cows and cows maintened in padlots. The experimental design was completely randomized. The daily dry-matter intake of unsheltered cows (0.095 ± 0.006 kg/kg<sup>0.75</sup>), was significantly different (P< 0.01) from the stabled ones (0.077 ± 0.005 kg/kg<sup>0.75</sup>). There was significant correlation (P < 0.05) among dry-matter intake of unsheltered cows and environmental temperature, air humidity, wind velocity and precipitation, with coefficients varying from -0.58 to 0.51 while the feed intake of stabled cows was only correlated significantly (P < 0.05) with the environmental temperature at 7 a.m. with coefficient of -0.27. These results show that feed intake of Holstein cows kept in padlots was higher than in stabled cows, due to lower environmental temperatures, as high as 0.36 kgDM/cow for each unit of air temperature decrease and for each unit of increase of relative humidity and wind velocity at 7 a.m. and 9 p.m., simultaneously. | <p>A pesquisa, desenvolvida em Santa Maria, Estado do Rio Grande do Sul, durante os meses de julho e agosto de 1986, teve como objetivo determinar a variação no consumo de matéria seca, em função da diminuição da temperatura ambiente, por vacas holandesas abrigadas e desabrigadas, durante o inverno cm clima subtropical úmido. Foram utilizadas 12 vacas alimentadas "ad libitum" com ração à base de silagem de milho, distribuídas em dois tratamentos: vacas estabuladas (Grupo I) e vacas mantidas em piquetes sem abrigo (Grupo II), num delineamento inteiramente casualizado. O consumo diário, que foi de 0,077± 0.005 e 0,095 ± 0,006 kgMS/kg<sup>0,75</sup> nos Grupos I e II, respectivamente, apresentou diferença significativa (P < 0,01). A temperatura ambiente, umidade relativa do ar, velocidade do vento e precipitação correlacionaram-se significativamente (P< 0,05) com o consumo de MS das vacas desabrigadas, cujos coeficientes de correlação variaram de -0,58 a 0,51, enquanto o consumo tias vacas estabuladas apresentou correlação significativa (P < 0,05) com a temperatura ambiental às 7 horas, com coeficiente de -0,27. Concluiu-se que as temperaturas baixas determinam aumento no consumo de volumoso em vacas holandesas, sendo que os animais desabrigados consumiram em média 0,36 kgMS/vaca a mais que os estabulados, para cada unidade de diminuição da temperatura do ar e aumento da umidade relativa e velocidade do vento, às 7 e 21 horas, simultaneamente.</p>
Afficher plus [+] Moins [-]An insight into the histopathology caused by the tick Rhipicephalus sanguineus (Acarina: Ixodidae) in the skin of previously infested, vaccinated or tick-bite naive dogs, guinea pigs and hamsters | Momento histopatológico na pele de cães, hamsters e cobaias sofrendo infestação experimental pelo carrapato Rhipicephalus sanguineus pela primeira vez ou após vacinações ou infestações prévias Texte intégral
1995
Matias Pablo Juan Szabó | Gervásio Henrique Bechara
<p>Dogs', guinea pigs' and hamsters’ local skin reaction to the attachment and feeding of the tick <em>Rhipicephalus sanguineus </em>were analysed under light microscopy. The hosts were either tick-bite naive, previously infested or vaccinated with crude unfed adult tick extract. Biopsies were taken at the end of each infestation. Changes common to every host, regardless of experimental group, included presence of tick or its mouthparts embedded in a cone of cementum at the surface of the skin, epidermal hyperplasia, hyperkeratosis and acanthosis, edema and copious inflammatory cell infiltration in the dermis, underneath the tick attachment site. Dogs in all experimental groups reacted with an almost exclusive PMN neutrophil accumulation, while guinea pigs showed a predominantly mononuclear cell infiltration in every experimental group. Hamsters suffering first infestations had a mainly neutrophilic infiltration, showed a predominantly mononuclear cell infiltration in response to multiple infestations, and when previously vaccinated this host had a predominantly eosinophilic infiltration. The persistence of PMN neutrophils in dogs suggest a control of the local immune inflammatory response by the tick. The predominantly eosinophilic infiltration in previously vaccinated hamsters might indicate that different immune mechanisms were triggered by infestation and vaccination.</p> | Analisou-se, sob microscopia óptica, reação cutânea de cães, hamsters e cobaia à fixação e alimentação do carrapato <em>Rhipicephalus sanguineus. </em>Os hospedeiros empregados foram previamente infestados ou vacinados com extrato total de carrapato adulto não alimentado ou eram livres de contato anterior com o carrapato. Biópsias foram obtidas ao final de cada infestação. As alterações comuns a todos os hospedeiros, independente do grupo experimental, incluíram a presença de carrapato ou de suas peças bucais embutidos em um cone de cemento na superfície da pele, hiperplasia da epiderme, hiperqueratose e acantose, edema e infiltração celular inflamatória intensa na derme abaixo do ponto de fixação do carrapato. Os cães, em todos os grupos experimentais, reagiram com um acúmulo praticamente exclusivo de neutrófilos polimorfonucleares enquanto cobaias exibiram uma infiltração celular predominantemente mononuclear nas diversas condições experimentais. Hamsters sofrendo primeira infestação apresentaram uma infiltração predominantemente neutrofílica, infiltração predominantemente mononuclear em resposta a múltiplas infestações e, quando vacinados, uma infiltração preponderantemente eosinofílica. A persistência de neutrófilos nos cães sugere um controle local da resposta inflamatória imune pelo carrapato. A infiltração predominantemente eosinofílica em hamsters vacinados poderia indicar que mecanismos imunes diferentes foram desencadeados pela infestação e vacinação.
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