n The Dairy Mail - To cull or not to cull - : production - research column

Volume 22, Issue 6
  • ISSN : 1561-4301


If the number of replacement heifers can be optimised, it may have positive genetic, economic and environmental consequences for the enterprise. These influences are sometimes opposing. For example, in a herd that is genetically upgraded, superior heifer genetic material will be beneficial to the longer-term economy. However, a lower replacement rate will be beneficial to the economy because herd yield is maximised over the shorter term and to the environment, as less methane will be produced per kilogram of milk if the herd otherwise remains constant.

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