RESUMO
A technique for the catheterisation of the right ventricle and pulmonary artery of the domestic fowl is described. Mean peak systolic, minimum diastolic and mean pressures measured in the right ventricle and pulmonary artery of a group of clinically normal broilers housed at a medium altitude of 1,300 m were 24.3; 8.1; 17.8; 25.0; 22.1 and 22.3 mm Hg respectively. The pulmonary artery pressures are different from those reported elsewhere using the open chest technique. These differences are possibly due to both the effect of opening the thoracic cavity and the hypoxic pressor effect at this altitude.
Assuntos
Determinação da Pressão Arterial/veterinária , Galinhas/fisiologia , Pressão Propulsora Pulmonar , Animais , Determinação da Pressão Arterial/métodos , Cateterismo Cardíaco/métodos , Cateterismo Cardíaco/veterinária , Feminino , Ventrículos do Coração , Hipertensão Pulmonar/veterinária , Masculino , Doenças das Aves Domésticas/fisiopatologia , Valores de ReferênciaRESUMO
A paramyxovirus was isolated from diseased pigeons, submitted to the Poultry Section of the Veterinary Research Institute, Onderstepoort, for post-mortem examination. The mean death time for the isolates was determined to ascertain the virulence of the virus. Infectivity trials showed that the paramyxovirus was non-virulent for 60- and 4-week-old chickens infected by the intraocular and intratracheal routes.
Assuntos
Doenças das Aves/microbiologia , Columbidae/microbiologia , Paramyxoviridae/isolamento & purificação , Infecções por Respirovirus/veterinária , Animais , Infecções por Respirovirus/microbiologia , África do SulRESUMO
Infection with the obligatory intra-erythrocytic anaplasma-like rickettsia Aegyptianella pullorum in 4-week-old broilers at a moderate altitude of 1,200 m produced a significant increase in the mean relative right ventricular (RV) mass (RV: TV) from 0.23 in the controls to 0.31 in the infected group. This was accompanied by an increase in the number of birds suffering from severe RV hypertrophy from 14.3% in the controls to 50% in the infected group. Pulmonary hypertension and subsequent RV hypertrophy could have been caused by the severe anaemia experienced in the course of the infection or by metabolic or biochemical action of A. pullorum. As the agent does not occur on commercial broiler farms, it cannot play a practical role in the broiler ascites syndrome.