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Growth and carcass characteristics of lot-fed Wagyu beef cattle and the estimation of homozygosity from band sharing patterns of random amplied polymorphic DNA markers

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Malau-Aduli, AEO and Inoue, S and Richards, T and Howard, A and Thompson, A (2007) Growth and carcass characteristics of lot-fed Wagyu beef cattle and the estimation of homozygosity from band sharing patterns of random amplied polymorphic DNA markers. Journal of Animal Science, 85 (Suppl ). pp. 189-190. ISSN 1525-3163

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Official URL: http://jas.fass.org/

Abstract

The Wagyu breed of beef cattle is renowned for its ability to deposit
high levels of intramuscular fat resulting in highly marbled beef that
meets consumer demands in some niche export markets. We evaluated
the post-weaning growth performance and carcass characteristics
at slaughter of purebred Wagyu steers raised in the feedlot after an
initial backgrounding on grass and silage. Our main aim was to study
the average daily gains (ADG), body condition scores (BCS) and
liveweight (LWT) changes from weaning to slaughter and to estimate
homozygosity and inbreeding coefficients through band sharing
patterns using random amplied polymorphic DNA (RAPD) markers.
LWT, ADG and BCS were monitored monthly from 2005-2006.
Genomic DNA was extracted from blood samples, amplied using
RAPD primers, fragments resolved by gel electrophoresis and banding
patterns elucidated under UV light. A linear increase in liveweight as
age increased was observed and the typical uctuation due to seasonal
variations observed under grazing conditions was unnoticeable.
Average LWT ranged from an initial 110kg to 660kg, ADG ranged
from 0.7–2.0kg/day and BCS reached the maximum of 5 at the end
of the experiment. Average LWT at slaughter was 574kg with a hot
carcass weight of 329kg and a dressing percentage of 57%. Mean eye
muscle area was 94cm2, eye muscle width 8cm and eye muscle length
16cm. Marbling score was 3, subcutaneous fat depth of 17cm and
total trimmed fat weight was 34kg. Average saleable meat yield
based on the 4 most valuable hind muscles were: Round (11.7kg),
Topside (19.3kg), Rump (13.6kg) and Silverside (15.8kg). Average
band sharing frequencies ranged from 0.60 to 0.96 with estimated
inbreeding coefcients ranging from 0.5% to 7%, respectively. It was
concluded that the inbreeding level was low, negligible and not in
any way detrimental to meat yield and carcass quality destined for the
Japanese market. Finally, RAPD markers were not versatile enough toclearly differentiate between the fastest and slowest growing animals
within the Wagyu breed.

Item Type: Article
Keywords: RAPD Markers, Wagyu, Carcass Traits
Journal or Publication Title: Journal of Animal Science
Page Range: pp. 189-190
ISSN: 1525-3163
Identification Number - DOI: 215
Date Deposited: 04 Jan 2008 00:59
Last Modified: 18 Nov 2014 03:26
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