Abstract
The research was carried out in 2006 and 2007 on two genotypes of ewes: PLS (Polish Lowland sheep) and BCP (synthetic line), which were kept in two systems, namely on pasture and
in an indoor system of maintenance. The ewes in the indoor system of maintenance were kept in a building while being allowed to run outside, whereas in the pasture system they were kept in the open air all year round, while having access to a roofed shed. The aim of the research was to determine the influence of the system of maintenance on both the milk yield and its chemical composition. The research conducted reveals certain changes between these two systems as regards the 24-hour milk yield and the chemical composition of the ewes’ milk in subsequent control milking sessions. It was revealed that the number of somatic cells was higher in the groups of ewes with a higher 24-hour yield, and that the PLS ewes kept on pasture, as opposed to the BCP ewes, were characterised by a higher 24-hour yield. The milk yield for the lactation period of 70 days was comparable for the ewes kept in the two systems of maintenance under analysis.
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