Adediran, S.A., Donaghy, D.J., Freeman, M., and Malau-Aduli, A.E.O. (2007) Comparative effects of ASI and APR sire breeding values on the lactation profile of pasture-based Holstein-Friesian cows. In: Proceedings of the Association for the Advancement of Animal Breeding and Genetics (17) pp. 449-452. From: AAABG 2007: 17th Conference of the Australian Association of Animal Breeding and Genetics, 23-26 September 2007, Armidale, NSW, Australia.

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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merit cows but for pasture-based production systems, the impact of emerging EBV evaluation methods remains largely unpublished.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 ID:	55016
Item Type:	Conference Item (Research - E1)
ISBN:	978-0-9586299-2-8
ISSN:	1328-3227
Related URLs:	Organisation
Date Deposited:	27 Nov 2018 02:43
FoR Codes:	07 AGRICULTURAL AND VETERINARY SCIENCES > 0702 Animal Production > 070201 Animal Breeding @ 100%
SEO Codes:	83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8303 Livestock Raising > 830302 Dairy Cattle @ 100%
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