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Intranasal Immunization and Milk Collection in Studies of Maternal Immunization in New Zealand White Rabbits Oryctolagus cuniculus
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Breed structures in Australian dairy herds.

J E Coombe1, J M Morton2, D S Beggs1

  • 1Melbourne Veterinary School, University of Melbourne, 250 Princes Highway, Werribee, Victoria, 3030, Australia.

Australian Veterinary Journal
|October 15, 2021
PubMed
Summary
This summary is machine-generated.

Australian dairy farmers increasingly use crossbreeding, with two-breed systems most common. Herd breed structures are dynamic, changing over time and varying by region and calving system.

Keywords:
Australiabreedingdairyfertilityheterosis

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Area of Science:

  • Animal Science
  • Dairy Husbandry
  • Agricultural Economics

Background:

  • Australian dairy herds undergo significant breed structure changes.
  • Understanding these changes is crucial for herd management and genetic improvement.

Purpose of the Study:

  • To describe the prevalence and evolution of crossbreeding strategies in Australian dairy herds.
  • To analyze the proportions of two-breed versus three-breed crossbreeding systems.
  • To investigate how herd breed structures have changed between 2000 and 2013.

Main Methods:

  • Analysis of a large dataset from Australian milk-recording herds.
  • Tracking herd breed structures over an extended period (2000-2013).
  • Categorization of herds based on breed composition (purebred, two-breed crossbred, three-breed crossbred).

Main Results:

  • Two-breed crossbreeding was the most common structure (39% of herd-years), followed by purebred (35%).
  • A decrease in purebred herds and an increase in crossbreeding herds (especially three-breed) were observed.
  • Breed structure dynamics varied regionally and by calving system, with some herds exhibiting cyclical changes.

Conclusions:

  • Australian dairy herd breed structures are dynamic and evolving.
  • Crossbreeding is a prevalent strategy employed by Australian dairy farmers.
  • Regional and management factors influence herd breed structure trends.