The effect of milking equipment on the free fatty acids content in raw milk
2000
Henno, M. | Olkonen, A. (Estonian Agricultural Univ., Tartu (Estonia). Inst. of Animal Husbandry)
Raw milk samples were taken from bulk tanks at different farms monthly from August 1999 to January 2000. The content of free fatty acids (FFA) was measured by copper soap method. Pipeline milking equipment used on studied farms was divided into three groups: old equipment - incorrectly installed systems with 1...4 vertical ascents; reconstructed equipment - old equipment with proper slope and removed vertical ascents; new equipment installed after 1994. The content of FFA level in milk produced by using reconstructed pipeline milking systems was equivalent to the FFA content in milk from farms equipped with new pipeline milking systems. Mean values of raw milk FFA content on farms equipped with old and reconstructed milking systems were statistically different (P0.001). FFA content in milk was considerably higher using old and incorrectly installed pipeline milking systems exceeding the value of 1 meq FFA/100g fat in 78.6 per cent of cases. Fluctuation of vacuum level in milk line causes agitation and therefore the rise of FFA content. Reconstruction of old pipeline milking systems enables to improve the quality of raw milk by reducing the content of FFA. Taking the standard of FFA in raw milk into use in advisory purposes will help to explain the need of regular testing of milking equipment and reconstruction of the old ones which lead to the improvement of raw milk quality
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