Association of quarter milking measurements and cow-level factors in an automatic milking system

Journal of Dairy Science
J F PenryD J Reinemann

Abstract

The primary aim of this observational study, in a single herd milked using multiple automatic milking system units, was to describe associations of quarter milk yield variability and quarter peak milk flow rate with cow-level factors. Information from the current lactation of 1,549 primiparous and multiparous cows was collected from January to December 2015. Data from each individual milking used in the analysis included quarter milk yield (QMY), udder milk yield, quarter peak milk flow rate (QPMF), quarter average milk flow rate (QAMF), quarter milking time, and milking interval. Milking interval and milk yield were used to calculate milk production rate (kg/h) at the quarter and udder levels. We investigated associations between QPMF and milking interval, QPMF and days in milk, and QMY and QAMF. A strong association between QPMF and both QAMF and milking interval was observed. A moderate association was found between QPMF and stage of lactation. However, QMY was not a useful indicator of QPMF because of the weak association observed between these variables. In this study, rear quarter QPMF was significantly increased by 3% compared with front quarter QPMF (1.45 vs 1.41 kg/min). Quarter milk yield was calculated as a percentag...Continue Reading

References

Mar 2, 2006·Journal of Dairy Science·V TancinJ Macuhová
Nov 16, 2006·Journal of Dairy Science·M SperoniS Lolli
Jul 27, 2010·Journal of Dairy Science·L ForsbäckK Svennersten-Sjaunja
Jan 28, 2012·Journal of Dairy Science·A CastroJ Bueno
Aug 25, 2015·Journal of Dairy Science·S R Weaver, L L Hernandez
Feb 24, 2016·Journal of Dairy Science·Marlène TremblayDörte Döpfer

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