Hostname: page-component-745bb68f8f-b95js Total loading time: 0 Render date: 2025-01-09T06:27:08.499Z Has data issue: false hasContentIssue false
  • English
  • Français

A Comparison of some suggested measures of persistency of milk yield in dairy cows

Published online by Cambridge University Press:  02 September 2010

Ove Madsen
Ove Madsen
Affiliation:
Institute of Animal Science, Veterinary and Agricultural University, Copenhagen, Denmark
Get access

Summary

Five measures of persistency of milk yield were compared by means of apparent heritabilities and repeatabilities using 598 first lactation records from the Danish progeny testing stations and 354 records of all parities from Red Danish cows at a state experimental farm. Unbiased estimates of heritabilities could not be obtained because of common environmental effects. Results indicate that measures of persistency giving equal weight to single milk records are superior to measures giving different weight to single records.

Correlations between persistency, expressed as the absolute decrease of yield, and maximum daily yield were —0·46 to —0·52 (phenotypic) and —0·22 (genetic). Correlations between persistency and 305-day yield were —0·06 to —0·10 (phenotypic) and 0·02 (genetic).Correlations between persistency, expressed as the decrease of yield relative to level of yield in early lactation, and maximum daily yield were —0·06 to —0·13 (phenotypic) and 0·17 to 0·42 (genetic). Correlations between the measure of persistency and 305-day yield were 0·12 to 0·45 (phenotypic) and 0·45 to 0·69 (genetic).

Type
Research Article
Information
Animal Production , Volume 20 , Issue 2 , April 1975 , pp. 191 - 197
Copyright
Copyright © British Society of Animal Science 1975

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Christensen, L. G. 1970. Progeny testing of dairy sires based on field and test-station data. I. Phenotypic and genetic relations. Acta Agric. scand. 20: 293–301.Google Scholar
Christensen, L. G. 1974. Progeny testing of dairy sires based on field and test-station data. II. Half-sib and half-cousin analysis. Acta Agric. scand. 24: 147–159.Google Scholar
Harvey, W. R. 1972. Instructions for use of LSMLMM, 31 pp. Ohio State University.Google Scholar
Keown, J. F. and Van Vleck, L. D. 1971. Selection on test day fat percentage and milk production. J. Dairy Sci. 54: 199–203.Google Scholar
Madsen, O. 1974a. Investigations on the shape of the lactation curve in dairy cattle. 71 pp. Thesis, Royal Vet. Agric. University, Copenhagen.Google Scholar
Madsen, O. 1974b. Correlated changes on the lactation curve due to selection for total butterfat yield. 25th Annual Meeting of EAAP, Copenhagen.Google Scholar
Wood, P. D. P. 1968. Factors affecting persistency of lactation in cattle. Nature, Lond. 218: 894.Google Scholar