Changes in the traits of the milk productivity of dairy cows depending on different count of somatic cells in milk | Slaucamo govju piena produktivitātes pazīmju izmaiņas atkarība no dažāda somatisko šūnu daudzuma pienā
2012
Ruska, D., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Agriculture. Inst. of Agrobiotechnology | Jonkus, D., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Agriculture. Inst. of Agrobiotechnology
Cow milk is a complex fluid consisting of a great number of components. The objective of this study was to evaluate the relation between somatic cell count and milk proteins in cow milk at four different farms with Latvian Brown and Holstein Black and White breeds cows. The data of milk yield and content of total protein, casein, urea (mg 100 mLE-1) and somatic cell count (SCC) was collected from the herd on the test day from September 2009 to December 2010. Milk content parameters for total 8400 milk samples were analyzed at the accredited milk quality laboratory. The statistical analyses were performed by means of SPSS. The average milk yield was 23.9±8.09 kg and 26.6±9.50 mg 100 mLE-1 of urea level per test day. The average protein and casein contents were 3.57±0.44% and 2.74±0.33%. The average SCC was 207.8 thousand mLE-1. SCC were arrange in seven groups. On the basis of General Linear Model data it was establish that the influence of SCS variability on milk yield, protein, casein and urea level was statistically believable (p is less than 0.001). The group of SCC from 1 to 100 thousand mLE-1 had significantly (p is less than 0.001) higher milk yield and urea level (25.1±0.11 kg and 27.4±0.13 mg 100 mLE-1) and lower milk protein and casein (3.49±0.006% and 2.69±0.004%) in cow milk.
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