RESUMEN
The correlation between climatic parameters with one another in fattening units and the influence of environmental factors on lung lesions registered at slaughter were studied in 6 integrated herds with continuous production systems. In addition, the influence of environmental parameters on the spread of Mycoplasma hyopneumoniae and Actinobacillus pleuropneumoniae (serotypes 2 and 3) and on the productivity was monitored in 2 specialized fattening herds with strict batch production. The outdoor temperature was positively correlated to the indoor temperature, but negatively correlated to the relative humidity and the concentration of carbon dioxide in the stables. These indoor parameters were also correlated to each other. The concentration of ammonia was not correlated to any other climatic parameter. No correlation between the climatic parameters measured and the prevalences of pneumonia and pleuritis registered at slaughter was shown. The rapidness in spread of mycoplasmosis seemed to be more dependent of the antibody status of the pigs on arrival than on the climate of the units. In contrast, a correlation between the climatic parameters and the spread of the less contagious infection (Actinobacillus) was indicated. The influence of the climatic parameters on the daily weight gain was not ensured.
Asunto(s)
Infecciones por Actinobacillus/veterinaria , Actinobacillus pleuropneumoniae , Pulmón/patología , Infecciones por Mycoplasma/veterinaria , Enfermedades de los Porcinos , Mataderos , Infecciones por Actinobacillus/patología , Infecciones por Actinobacillus/transmisión , Crianza de Animales Domésticos , Animales , Clima , Vivienda para Animales , Infecciones por Mycoplasma/patología , Infecciones por Mycoplasma/transmisión , Suecia , Porcinos , Aumento de PesoRESUMEN
The effect of a consistent programme for oestrus control and oestrus induction has been investigated in some herds with oestrous problems already participating in the efficiency control programme (RASP). Forming part of the project was a clinical trial of a PMSG/HCG preparation (SUIGONAN VET.) to be applied in cases where natural stimulation of sows did not lead to oestrus. The other herds participating in the efficiency control programme of the same area were used as control herds. In the trial herds the below treatment programme was followed: Gilts not showing oestrus at the age of 8 months were treated with hormones. Sows which had farrowed at least twice and did not show oestrus less than 10 days after weaning were also treated with hormones. All primiparous sows were treated with a hormone preparation on the day after weaning. These animals were observed during an additional reproduction cycle to demonstrate the possible negative effect of the hormones on the following oestrus/pregnancy. The results of the gonadotropin treatment of gilts and older sows were not encouraging. However, the treatment may have a certain prognostic value as slaughter should be considered in cases where the sows do not show signs of oestrus within a week after treatment. The results of the treatment of primiparous sows were satisfactory with respect to oestrus as well as to the result of parturition after service. Treatment of primiparous sows on the day after weaning must be limited with regard to time (max. 1--2 months) to remedy occasional oestrous irregularities which it has not been possible to cure by natural oestrus induction.