Composition and renneting properties of raw bulk milk in Estonia
2012
Kriščiunaite, Tiina | Stulova, Irina | Taivosalo, Anastassia | Laht, Tiiu-Maie | Vilu, Raivo
Seasonal variations in milk composition and renneting properties were determined in more than 1000 raw bulk milk samples from individual farms in Estonia. Pooled milk from tank trucks and dairy silos originating from the same milkings was also analysed. Changes in whey protein to casein ratio, due to partial degradation of κ- and β-casein fractions, were observed in pooled milk from tank trucks and dairy silos. Likewise, rennet flocculation time (RFT) was 1 min longer compared with that of milk from individual farms. Milk pH correlated significantly with curd firmness and RFT, whereas curd firmness correlated also with protein content and with κ-casein fraction in particular (r = 0.45). The important correlations between milk composition and renneting characteristics observed earlier in the case of milk from individual cows were essentially the same in the case of bulk milk delivered for processing.
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