Chosen paradoxes of mammary gland function in cows and results of milk properties
2013
Hanus, O., Dairy Research Institute Ltd., Prague (Czech Republic) | Bjelka, M., Cattle Breeders Corporation Impuls, Bohdalec (Czech Republic) | Kucera, J., Research Institute for Cattle Breeding, Rapotin (Czech Republic) | Zhang, Y., Anhui Agricultural Univ., Hefei (China). Dept. of Animal Sciences | Roubal, P., Dairy Research Institute Ltd., Prague (Czech Republic) | Vyletelova, M., Dairy Research Institute Ltd., Prague (Czech Republic) | Kopecky, J., Research Institute for Cattle Breeding, Rapotin (Czech Republic)
Dairy paradoxes are the questions of relations between milk indicators (MI) such as fat content (F), urea concentration (U), somatic cell count (SCC), and milk freezing point (MFP). The aim of the study was to explain some paradox relationships. Relations of relevant MI in native milk and modified (F content change = MOD) samples were compared. Not even in an incorrect sampling or intentional technological milk modification such as MOD can it be thought of a possibility that it would come to a noticeable influencing of MFP (F x MFP; r = 0.03) even though F is an important part of solid. Possible problems of a dairy herd with MFP (MFP x SCC; r = 0.36 for native milk) cannot be mitigated by tolerance to higher SCC levels in bulk milk, either because of the risk of decrease of milk yield and quality. An incorrect milk sampling with an increased F content or its technological increase (dead milk) apparently damages milk quality in SCC (F x SCC; r = 0.009 for native milk; but r = 0.93 for MOD, where the F increase by 1% causes the SCC growth by 176 x 10E3/ml).
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