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Real-time evaluation of milk quality as reflected by clotting parameters of individual cow's milk during the milking session, between day-to-day and during lactation

Published online by Cambridge University Press:  28 March 2013

Gabriel Leitner ,
Uzi Merin ,
Shamay Jacoby ,
Dror Bezman ,
Liubov Lemberskiy-Kuzin  and
Gil Katz
Gabriel Leitner*
Affiliation:
National Mastitis Reference Center, Kimron Veterinary Institute, PO Box 12, Bet Dagan 50250, Israel
Uzi Merin
Affiliation:
Department of Food Quality and Safety, Agricultural Research Organization, the Volcani Center, PO Box 6, Bet Dagan 50250, Israel
Shamay Jacoby
Affiliation:
Institute of Animal Science, Agricultural Research Organization, the Volcani Center, PO Box 6, Bet Dagan 50250, Israel
Dror Bezman
Affiliation:
Afimilk, Afikim 15148, Israel
Liubov Lemberskiy-Kuzin
Affiliation:
Afimilk, Afikim 15148, Israel
Gil Katz
Affiliation:
Afimilk, Afikim 15148, Israel
*
†E-mail: leitnerg@moag.gov.il
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Abstract

Real-time analysis of milk coagulation properties as performed by the AfiLab™ milk spectrometer introduces new opportunities for the dairy industry. The study evaluated the performance of the AfiLab™ in a milking parlor of a commercial farm to provide real-time analysis of milk-clotting parameters –Afi-CF for cheese manufacture and determine its repeatability in time for individual cows. The AfiLab™ in a parlor, equipped with two parallel milk lines, enables to divert the milk on-line into two bulk milk tanks (A and B). Three commercial dairy herds of 220 to 320 Israeli Holstein cows producing ∼11 500 l during 305 days were selected for the study. The Afi-CF repeatability during time was found significant (P < 0.001) for cows. The statistic model succeeded in explaining 83.5% of the variance between Afi-CF and cows, and no significant variance was found between the mean weekly repeated recordings. Days in milk and log somatic cell count (SCC) had no significant effect. Fat, protein and lactose significantly affected Afi-CF and the empirical van Slyke equation. Real-time simulations were performed for different cutoff levels of coagulation properties where the milk of high Afi-CF cutoff value was channeled to tank A and the lower into tank B. The simulations showed that milk coagulation properties of an individual cow are not uniform, as most cows contributed milk to both tanks. Proportions of the individual cow's milk in each tank depended on the selected Afi-CF cutoff. The assessment of the major causative factors of a cow producing low-quality milk for cheese production was evaluated for the group that produced the low 10% quality milk. The largest number of cows in those groups at the three farms was found to be cows with post-intramammary infection with Escherichia coli and subclinical infections with streptococci or coagulase-negative staphylococci (∼30%), although the SCC of these cows was not significantly different. Early time in lactation together with high milk yield >50 l/day, and late in lactation together with low milk yield<15 l/day and estrous (0 to 5 days) were also important influencing factors for low-quality milk. However, ∼50% of the tested variables did not explain any of the factors responsible for the cow producing milk in the low – 10% Afi-CF.

Keywords

milk clotting parametersreal-time evaluationcheese yield
Type
Product quality, human health and well-being
Information
animal , Volume 7 , Issue 9 , September 2013 , pp. 1551 - 1558
Copyright
Copyright © The Animal Consortium 2013 

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