engleski

Influence of some non-genetic parameters on production and quality of milk of East-Friesian sheep in Croatia

The aim of the study was to determine the influence of the herd, year and the stage of lactation (0-60th day ; 61st-150th day and 151st – drying off) on the daily milk yield, physical-chemical properties and the hygienic quality of milk. The study was conducted during 2004 and 2005 year on a sample of 100 sheep in two herds. The milk samples were taken during the morning and the evening milking after weaning (30th day), every 30 days during lactation. The physical-chemical properties and the hygienic quality of milk were determined by reference and standard methods. The collected data were statistically analysed by the PROC ANOVA, SAS programme. The East Friesian sheep in the lactation of 217 days, produced in average 1040 mL milk/day. A significant effect (P<0.01) of the herd (A and B) and year (2004 and 2005) has been determined on the daily milk yield, the somatic cell count and the total bacterial count. A significant effect (P<0.01) of the herd was determined on the content of milk fat (5.8 : 6.0 %) and proteins (5.2 : 5.0 %) in milk. The stage of lactation had a significant effect (P<0.01) on all analyzed parameters except on the somatic cell count. The greatest content of fat (6.53 %), proteins (5.44 %), dry matter (17.45 %) and dry matter non fat (10.98 %) were determined in both herds at the end of lactation, while the content of lactose (4.61 %) was the lowest. Significant correlations (P<0.05) were also determined between the daily milk yield and: the content of dry matter (-0.46), milk fat (-0.51), proteins (-0.39), lactose (0.51), dry matter non fat (-0.28), pH value (0.14). From the results, it can be concluded that the herd, year and the stage of lactation have significant influence on the most analyzed parameters.

sheep milk; milk composition; hygienic quality and stage of lactation

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