The Authors studied the relationship between respiratory diseases and some chemical and physical climatic variables during two production cycles on 95 and 246 beef calves, respectively. Multivariate (Factor and discriminant analyses) and univariate (Pearson correlation coefficient) methods were used. The role of PI-3, IBR and BAV-3 viruses was investigated by analysis of the pattern of the antibody responsethroughout the periods of observation. IBR in the first cycle (10 July - 2 October) and all the three viruses in the second cycle (8 October - 2 January) seem to be responsible for the observed respiratory signs. The temperature in summer, the humidity in fall seem to be the most relevant risk factors of bovine respiratory diseases under the conditions of the present study
Relazioni tra fattori ambientali e sindromi respiratorie in vitelli durante lo svezzamento
MARTINI, MARCO;
1990
Abstract
The Authors studied the relationship between respiratory diseases and some chemical and physical climatic variables during two production cycles on 95 and 246 beef calves, respectively. Multivariate (Factor and discriminant analyses) and univariate (Pearson correlation coefficient) methods were used. The role of PI-3, IBR and BAV-3 viruses was investigated by analysis of the pattern of the antibody responsethroughout the periods of observation. IBR in the first cycle (10 July - 2 October) and all the three viruses in the second cycle (8 October - 2 January) seem to be responsible for the observed respiratory signs. The temperature in summer, the humidity in fall seem to be the most relevant risk factors of bovine respiratory diseases under the conditions of the present study
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