بررسی اثر تعداد سلول های سوماتیک بر ترکیبات شیر استان خراسان رضوی

Khorasan Razavi Province with 6.83 % Iran milk production is an important area of animal husbandry. In this study, the relationship between milk composition and total bulk milk somatic cell counts was investigated. 123 samples of bulk tank milk were randomly selected from 41 dairy farmers in the Province of Khorasan Razavi (Iran) during April–March 2006, every month. A total of 1476 samples were analyzed. Samples were analyzed for acidity, fat, protein content and somatic cell counts. The results showed that the season of raw milk production did not have significant effect on the acidity. Fat concentration increased gradually from spring to winter and there were significant difference between spring and other seasons (P<0.05). Higher levels of the protein content were observed in samples collected during the autumn and winter seasons. The highest total bulk milk somatic cell counts were in July. Total bulk milk somatic cell counts had significant impact on acidity, fat and protein content. Moreover, the level of acidity and fat in milk decreased with increasing SCC (P<0.01, P<0.05 respectively). A significant (P<0.001) positive relationship was observed between total bulk milk somatic cell and protein content in milk. Also, positive correlation (R² = 0.91) were established between direct microscopic cell count and Somatos instrument.