Please Note:

The Open Access Repository will be moving to a new authentication system on the 1st of November.

From this date onwards, account holders will be required to login using their University of Tasmania credentials.
If your current repository username differs from your University username, please email E.Prints@utas.edu.au so we can update these details on your behalf.

Due to the change, there will be a short outage of the repository from 9am on the morning of the 1st of November

Open Access Repository

Comparative effects of ASI and APR sire breeding values on the lactation profile of pasture-based Holstein-Friesian cows

Downloads

Downloads per month over past year

Adediran, SA and Donaghy, DJ and Freeman, M and Malau-Aduli, AEO (2007) Comparative effects of ASI and APR sire breeding values on the lactation profile of pasture-based Holstein-Friesian cows. In: Genetic improvement - Making it happen’, Proceedings of the Association for the Advancement of Animal Breeding and Genetics 17th Conference, 23 September 2007, Armidale, Australia.

[img]
Preview
PDF
Malau-Aduli_200...pdf | Download (409kB)
Available under University of Tasmania Standard License.

| Preview

Abstract

Estimated Breeding Values (EBVs) of bulls are useful indicators of the genetic transmission ability of an animal of desirable traits to their progeny. Lactation profile differs between different merit cows but for pasture-based production systems, the impact of emerging EBV evaluation methods remains largely unpublished. In this study, Wood’s incomplete gamma model (Y(t) = atbe−ct ) was utilised to compare the effects of the Australian Selection Index (ASI) and Australian Profit Ranking (APR) EBVs on the shape of the lactation profile of first-parity, pasture-based Holstein-Friesian cows. Initial yield and the rate of increase to peak were significantly influenced by EBV choice, although peak yield was not. It was concluded that Wood’s incomplete gamma function adequately modelled the lactation profile of pasture-based cows explaining over 90% of the observed variation irrespective of using ASI or APR sire breeding values.

Item Type: Conference or Workshop Item (Other)
Keywords: Australian Selection Index, Australian Profit Ranking, EBV, lactation profile, pasture-based Holstein-Friesian
Journal or Publication Title: In: K Donoghue, B Pattie, B Restall, B Kinghorn (Editors), 'Genetic improvement - Making it happen’, Proceedings of the Association for the Advancement of Animal Breeding and Genetics Conference, The University of New England, Armidale, Australia
Page Range: pp. 449-452
ISSN: 1328-3227
Date Deposited: 22 Jan 2008 21:38
Last Modified: 18 Nov 2014 03:27
Item Statistics: View statistics for this item

Actions (login required)

Item Control Page Item Control Page
TOP