Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(1), 101-112 | DOI: 10.11118/actaun201159010101

The effects of sample fat value manipulation on raw cow milk composition and indicators

Oto Hanuš1, Marcela Vyletělová1, Martin Tomáška2, Eva Samková3, Václava Genčurová4, Radoslava Jedelská4, Jaroslav Kopecký1
1 Agrovýzkum Rapotín, AgroResearch Rapotín, Výzkumníků 267, 788 13 Vikýřovice, Czech Republic
2 Výskumný ústav mliekárenský, Dairy Research Institute, Dlhá ulica 95, P. O. BOX C-54, 010 01, Žilina, Slovenská republika, The Slovak Republic
3 University of South Bohemia České Budějovice, Faculty of Agriculture, Studentská 13, 370 05 České Budějovice, Czech Republic
4 Výzkumný ústav pro chov skotu Rapotín, Research Institute for Cattle Breeding Rapotín, Výzkumníků 267, 788 13 Vikýřovice, Czech Republic

Values of milk indicators (MIs) can be influenced by sampling errors and milk manipulation. This paper estimated the freezing point depression (FPD) and other MIs drifts which can cause fat movement. That is important for: - preparation of reference milk samples (MSs) for proficiency testing and instrument calibrations; - estimation of the impact of milk treatment as centrifugation in dairy plants on FPD. Five MSs (A = original milk; milk with modified fat (F) content; B = less F, C = low F, D = more F, E = high F) were created (gravitation F separation at 4 °C for 12 hours) with the same milk matrix 12× per year. F averages increased by 4.80% (122.1%) from 1.68 to 6.48% due to manipulation. It increased variability of MIs especially for SNF (solids non fat), L (lactose) and CP (crude protein). SCC (somatic cell count) averages increased by 803 (196.8%) from 9 to 812 thousand.ml-1. Correlation (r) F × SCC was 0.85 (P < 0.001). SNF, L and CP averages decreased by 0.47% (5.3%), 0.31% (6.3%) and 0.17% (5.0%). Correlations were -0.78, -0.75 and -0.64 (P < 0.001). Urea decreased along with F increase by 1.05 mg.100ml-1 (2.9%) but with r -0.13 (P > 0.05). Acetone increased by 1.37 mg.l-1 (47.6%) with r 0.21 (P > 0.05). Electrical conductivity decreased by 0.23 mS.cm-1 (6.0%) with r -0.15 (P > 0.05). Alcohol stability was reduced by 0.14 ml (23.3%) with r -0.15 (P > 0.05). FPD, titration and actual acidity were not influenced.

Keywords: milk, sample, fat manipulation, milk freezing point, somatic cell count, milk indicators
Grants and funding:

Paper was supported by projects MSM 2678846201 and ME 09081 and by activities of NRL-RM in Rapotín and education project CZ.1.07/2.3.00/09.0081.

Received: August 8, 2010; Published: July 10, 2014  Show citation

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Hanuš, O., Vyletělová, M., Tomáška, M., Samková, E., Genčurová, V., Jedelská, R., & Kopecký, J. (2011). The effects of sample fat value manipulation on raw cow milk composition and indicators. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 59(1), 101-112. doi: 10.11118/actaun201159010101
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