Effects of pH, calcium chloride, and chymosin concentration on coagulation properties of abnormal and normal milk.
Individual Holstein cow milk samples were selected for good and poor chymosin-coagulation characteristics. The effect of pH adjustment, addition of .02% calcium chloride, and variation in chymosin concentration on coagulation properties of good and poor coagulating samples was evaluated. Pooling 50% good and 50% poor coagulating samples did not improve the average coagulation properties of the poor samples. Reducing milk pH to 6.3 caused a significant decrease in coagulation time but a less marked increase in curd firmness. The greatest increase in curd firmness was obtained by a combination of reducing milk pH, addition of .02% calcium chloride, and reducing chymosin concentration. High-chymosin concentration at reduced pH decreased coagulation time without substantially increasing curd firmness. Curd disintegration was more apparent at high-chymosin concentration in the poor coagulating samples.
D000818:Animals; D002122:Calcium Chloride / Q000494:pharmacology*; D002417:Cattle; D012085:Chymosin / Q000032:analysis*; D006863:Hydrogen-Ion Concentration; D008892:Milk / Q000032:analysis* / Q000187:drug effects / Q000201:enzymology
D012085:Chymosin; D002122:Calcium Chloride