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Analysis of the composition of milk in the first three lactations in Ayrshire cattle across four decades.

Knight, Roxanne B.; McEwan, Neil R.

Authors

Roxanne B. Knight

Neil R. McEwan



Abstract

Using historic lactation records for Ayrshire cattle, we report a gradual increase in the production of milk, butter fat and protein levels across four decades. This was generally at the extent of attaining a level of increase per decade which was similar to the increase seen between animals during their first and second lactations in the previous decade. However these increases were achieved without significantly affecting the percentage of butter fat or protein throughout the time examined, and also without changing the heifer : second lactation ratios.

Journal Article Type Article
Publication Date Dec 31, 2018
Journal Open agriculture
Electronic ISSN 2391-9531
Publisher De Gruyter
Peer Reviewed Peer Reviewed
Volume 3
Issue 1
Pages 245-249
Institution Citation KNIGHT, R.B. and MCEWAN, N.R. 2018. Analysis of the composition of milk in the first three lactations in Ayrshire cattle across four decades. Open agriculture [online], 3(1), pages 245-249. Available from: https://doi.org/10.1515/opag-2018-0026
DOI https://doi.org/10.1515/opag-2018-0026
Keywords Ayrshire cattle; Milk yields; Butter composition; Protein composition; Temporal variation

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