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Please use this identifier to cite or link to this item: http://hdl.handle.net/11019/346

Title: Accuracy of predicting milk yield from alternative milk recording schemes
Authors: Berry, Donagh P.
Olori, V. E.
Cromie, A.R.
Veerkamp, R. F.
Rath, M.
Dillon, Pat
Keywords: Milk recording
Milk yield
Issue Date: Feb-2005
Publisher: Cambridge University Press
Citation: D. P. Berry, V. E. Olori, A. R. Cromie, R. F. Veerkamp, M. Rath and P. Dillon (2005). Accuracy of predicting milk yield from alternative milk recording schemes. Animal Science, 80, pp 53-60. doi:10.1079/ASC34880053.
Series/Report no.: Animal Science;vol 80
Abstract: The effect of reducing the frequency of official milk recording and the number of recorded samples per test-day on the accuracy of predicting daily yield and cumulative 305-day yield was investigated. A control data set consisting of 58 210 primiparous cows with milk test-day records every 4 weeks was used to investigate the influence of reduced milk recording frequencies. The accuracy of prediction of daily yield with one milk sample per test-day was investigated using 41 874 testday records from 683 cows. Results show that five or more test-day records taken at 8-weekly intervals (A8) predicted 305-day yield with a high level of accuracy. Correlations between 305-day yield predicted from 4-weekly recording intervals (A4) and from 8-weekly intervals were 0.99, 0.98 and 0.98 for milk, fat and protein, respectively. The mean error in estimating 305-day yield from the A8 scheme was 6.8 kg (s.d. 191 kg) for milk yield, 0.3 kg (s.d. 10 kg) for fat yield, and −0.3 kg (s.d. 7 kg) for protein yield, compared with the A4 scheme. Milk yield and composition taken during either morning (AM) or evening (PM) milking predicted 24-h yield with a high degree of accuracy. Alternating between AM and PM sampling every 4 weeks predicted 305-day yield with a higher degree of accuracy than either all AM or all PM sampling. Alternate AM-PM recording every 4 weeks and AM + PM recording every 8 weeks produced very similar accuracies in predicting 305-day yield compared with the official AM + PM recording every 4 weeks.
Description: peer-reviewed
URI: http://hdl.handle.net/11019/346
http://dx.doi.org/10.1079/ASC34880053
http://journals.cambridge.org/article_S135772980500007X
ISSN: 1748-748X
Appears in Collections:Animal & Bioscience

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