|Popis v originálním jazyce: |
The aim of the study was to evaluate relationships between somatic cell count (SCC) and selected qualitative parameters of sheep milk (contents of fat (F), total protein (TP), casein (Cas) and lactose (L), pH, titratable acidity (TA) and clotting time (CT)). Determination of daily milk yield (DMY) and effect of the stage of lactation (SL) on selected parameters were also an integral part of the study. The study was carried out under operating conditions at a specialized sheep organic farm. Eighteen ewes of Lacaune breed were involved in the experiment. The SCCs insignificantly grew as lactation advanced, nevertheless, both mean counts (from 88 to 130 x 103/mL) and their counts in individual samples (from 36 to 420 x 103/mL) were relatively low during lactation. The SL also had no significant effect on pH and TA. On the other hand, the SL had a significant effect on all other monitored parameters. The SCC had a positive significant correlation with contents of F, TP and Cas. In contrast, between SCC and content of lactose a negative significant correlation was found. Many studies show that the content of lactose can be reduced with mastitis and SCC increase. However, in our opinion a negative significant correlation between SCC and lactose content was not affected by intramammary infection, because in all cases the SCCs were lower than the thresholds for subclinical mastitis in sheep. Our opinion also largely supports the fact, that all correlations between SCC and pH, TA, CT and DMY were insignificant.