Environmental interactions in an extensive outdoor keeping system for pigs = Interakcije med okoljem in prašiči pri ekstenzivni reji na prostem
Házas, Z. ; Horn, A. ; Körmendi, S.
These investigation were performed with the objective of studying interactions between intensive meat type pigs in outdoor production and their environment. The observations made in the present study ...indicate that the pigs brought about changes in the structure of the soil and the composition of the fauna of these land areas. The animals exhausted the supply of the plant species they favoured, and those not consumed due to the harmful alkaloids they contained multiplied on the sites. On examination of the water of the brook providing drinking water it was found that in the period of the study the presence of the animals exerted a measurable effect on the sites, but the parameters determined in the effluent water were of values far behind the lower limit values for damage to the environment. Fresh air, the possibility for free movement, and the natural sources of feedstuffs available all had a beneficial effect on the state of health of the animals, their reproductive activity and their meat quality. Outdoor keeping resulted in favourable influence on the reproduction traits of the pigs: the fertilisation ratios (above 85 %) were higher than those characteristic of closed keeping systems. Nor were the data for reproduction less favourable, but rearing mortality proved to be at different levels on the two sites studied.
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