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    <title>UTas ePrints - Post-weaning growth performance of heifers grazing Tasmanian native pastures and the estimation of inbreeding levels using random amplied polymorphic DNA markers</title>
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    <meta content="Malau-Aduli, A.E.O." name="eprints.creators_name" />
<meta content="Dunbabin, M." name="eprints.creators_name" />
<meta content="Aduli.MalauAduli@utas.edu.au" name="eprints.creators_id" />
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<meta content="2008-01-04 00:57:19" name="eprints.datestamp" />
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<meta content="Post-weaning growth performance of heifers grazing
Tasmanian native pastures and the estimation of inbreeding levels
using random amplied polymorphic DNA markers" name="eprints.title" />
<meta content="pub" name="eprints.ispublished" />
<meta content="270207" name="eprints.subjects" />
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<meta content="RAPD Markers, Post-weaning Growth, Beef Cattle" name="eprints.keywords" />
<meta content="The aims of this study were to evaluate the growth performance of
Hereford, Angus, Hereford × Angus and Hereford × Saler heifers within
the same herd grazing native pastures and to estimate homozygosity
and inbreeding coefcients using random amplied polymorphic DNA
(RAPD) markers. Post-weaning liveweight (BW), average daily gain
(ADG) and body condition score (BCS) on a scale from 0 to 5 were
monitored monthly from 2005 to 2006. Genomic DNA was extracted
from blood samples, amplified using RAPD primers, fragments
resolved by gel electrophoresis and banding patterns elucidated under
UV light. Estimation of homozygosity through band sharing patterns
was utilised in determining within-breed inbreeding levels. Regardless
of breed, LWT, BCS and ADG of heifers followed a typical sigmoid
curve pattern characterised by a decline in average BW from 200 kg
in May to 188 kg in June, a continuous monthly increase through to
March 2006 when it reached a peak (380 kg) before a nal decline to
375 kg in May. The BCS ranged from 1.6 to 3.6 while ADG ranged
from -0.4 to 1.5 kg/d. Significant genetic variation was observed
between the different breeds in that BCS and BW of purebred Angus
heifers were lower than those of purebred Hereford and their crosses
with Angus and Saler. Average BW of the Angus breed ranged from
164-349 kg, with BCS ranging from 1.4 to 3.3 compared to the
Hereford (186-383 kg, 1.6-3.6), Hereford × Angus (192-383 kg,
1.7-3.6) and Hereford × Saler (192-385 kg, 1.6-3.7), respectively. The
ADG of the Angus was not different from those of Hereford and their
crosses indicating that the Angus was perhaps better in terms of feed
efciency since they probably ate less and gained the same weight as
the heavier breeds that must have eaten more commensurate with their
maintenance requirements. The strongest residual correlation (r=0.98)
was between BW and BCS. Average band sharing frequencies ranged
from 0.60 in the crossbreds to 0.96 in the purebreds with estimated
inbreeding coefcients ranging from 0.5% to 3%, respectively, which
is very low." name="eprints.abstract" />
<meta content="2007-07-08" name="eprints.date" />
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<meta content="Journal of Animal Science" name="eprints.publication" />
<meta content="85" name="eprints.volume" />
<meta content="Suppl 1" name="eprints.number" />
<meta content="370" name="eprints.pagerange" />
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<meta content="Malau-Aduli, A.E.O. and Dunbabin, M. (2007) Post-weaning growth performance of heifers grazing Tasmanian native pastures and the estimation of inbreeding levels using random amplied polymorphic DNA markers. Journal of Animal Science, 85 (Suppl 1). 370. ISSN 1525-3163" name="eprints.citation" />
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Tasmanian native pastures and the estimation of inbreeding levels
using random amplied polymorphic DNA markers" name="DC.title" />
<meta content="Malau-Aduli, A.E.O." name="DC.creator" />
<meta content="Dunbabin, M." name="DC.creator" />
<meta content="270207 Quantitative Genetics" name="DC.subject" />
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<meta content="300401 Animal Breeding" name="DC.subject" />
<meta content="300406 Animal Growth and Development" name="DC.subject" />
<meta content="The aims of this study were to evaluate the growth performance of
Hereford, Angus, Hereford × Angus and Hereford × Saler heifers within
the same herd grazing native pastures and to estimate homozygosity
and inbreeding coefcients using random amplied polymorphic DNA
(RAPD) markers. Post-weaning liveweight (BW), average daily gain
(ADG) and body condition score (BCS) on a scale from 0 to 5 were
monitored monthly from 2005 to 2006. Genomic DNA was extracted
from blood samples, amplified using RAPD primers, fragments
resolved by gel electrophoresis and banding patterns elucidated under
UV light. Estimation of homozygosity through band sharing patterns
was utilised in determining within-breed inbreeding levels. Regardless
of breed, LWT, BCS and ADG of heifers followed a typical sigmoid
curve pattern characterised by a decline in average BW from 200 kg
in May to 188 kg in June, a continuous monthly increase through to
March 2006 when it reached a peak (380 kg) before a nal decline to
375 kg in May. The BCS ranged from 1.6 to 3.6 while ADG ranged
from -0.4 to 1.5 kg/d. Significant genetic variation was observed
between the different breeds in that BCS and BW of purebred Angus
heifers were lower than those of purebred Hereford and their crosses
with Angus and Saler. Average BW of the Angus breed ranged from
164-349 kg, with BCS ranging from 1.4 to 3.3 compared to the
Hereford (186-383 kg, 1.6-3.6), Hereford × Angus (192-383 kg,
1.7-3.6) and Hereford × Saler (192-385 kg, 1.6-3.7), respectively. The
ADG of the Angus was not different from those of Hereford and their
crosses indicating that the Angus was perhaps better in terms of feed
efciency since they probably ate less and gained the same weight as
the heavier breeds that must have eaten more commensurate with their
maintenance requirements. The strongest residual correlation (r=0.98)
was between BW and BCS. Average band sharing frequencies ranged
from 0.60 in the crossbreds to 0.96 in the purebreds with estimated
inbreeding coefcients ranging from 0.5% to 3%, respectively, which
is very low." name="DC.description" />
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    <h1 class="ep_tm_pagetitle">Post-weaning growth performance of heifers grazing Tasmanian native pastures and the estimation of inbreeding levels using random amplied polymorphic DNA markers</h1>
    <p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Malau-Aduli, A.E.O.</span> and <span class="person_name">Dunbabin, M.</span> (2007) <xhtml:em>Post-weaning growth performance of heifers grazing Tasmanian native pastures and the estimation of inbreeding levels using random amplied polymorphic DNA markers.</xhtml:em> Journal of Animal Science, 85 (Suppl 1). 370. ISSN 1525-3163</p><p style="margin-bottom: 1em" class="not_ep_block"></p><table style="margin-bottom: 1em" class="not_ep_block"><tr><td valign="top" style="text-align:center"><a onmouseover="EPJS_ShowPreview( event, 'doc_preview_3710' );" onmouseout="EPJS_HidePreview( event, 'doc_preview_3710' );" href="http://eprints.utas.edu.au/2802/1/Malau-Aduli_et_al_2007_JAnimSci85Suppl1HeifersRAPD.pdf"><img alt="[img]" src="http://eprints.utas.edu.au/style/images/fileicons/application_pdf.png" border="0" class="ep_doc_icon" /></a><div class="ep_preview" id="doc_preview_3710"><table><tr><td><img alt="" src="http://eprints.utas.edu.au/2802/thumbnails/1/preview.png" border="0" class="ep_preview_image" /><div class="ep_preview_title">Preview</div></td></tr></table></div></td><td valign="top"><a href="http://eprints.utas.edu.au/2802/1/Malau-Aduli_et_al_2007_JAnimSci85Suppl1HeifersRAPD.pdf"><span class="ep_document_citation">PDF</span></a> - Requires a PDF viewer<br />431Kb</td></tr></table><p style="margin-bottom: 1em" class="not_ep_block">Official URL: <a href="http://jas.fass.org/">http://jas.fass.org/</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">The aims of this study were to evaluate the growth performance of&#13;
Hereford, Angus, Hereford × Angus and Hereford × Saler heifers within&#13;
the same herd grazing native pastures and to estimate homozygosity&#13;
and inbreeding coefcients using random amplied polymorphic DNA&#13;
(RAPD) markers. Post-weaning liveweight (BW), average daily gain&#13;
(ADG) and body condition score (BCS) on a scale from 0 to 5 were&#13;
monitored monthly from 2005 to 2006. Genomic DNA was extracted&#13;
from blood samples, amplified using RAPD primers, fragments&#13;
resolved by gel electrophoresis and banding patterns elucidated under&#13;
UV light. Estimation of homozygosity through band sharing patterns&#13;
was utilised in determining within-breed inbreeding levels. Regardless&#13;
of breed, LWT, BCS and ADG of heifers followed a typical sigmoid&#13;
curve pattern characterised by a decline in average BW from 200 kg&#13;
in May to 188 kg in June, a continuous monthly increase through to&#13;
March 2006 when it reached a peak (380 kg) before a nal decline to&#13;
375 kg in May. The BCS ranged from 1.6 to 3.6 while ADG ranged&#13;
from -0.4 to 1.5 kg/d. Significant genetic variation was observed&#13;
between the different breeds in that BCS and BW of purebred Angus&#13;
heifers were lower than those of purebred Hereford and their crosses&#13;
with Angus and Saler. Average BW of the Angus breed ranged from&#13;
164-349 kg, with BCS ranging from 1.4 to 3.3 compared to the&#13;
Hereford (186-383 kg, 1.6-3.6), Hereford × Angus (192-383 kg,&#13;
1.7-3.6) and Hereford × Saler (192-385 kg, 1.6-3.7), respectively. The&#13;
ADG of the Angus was not different from those of Hereford and their&#13;
crosses indicating that the Angus was perhaps better in terms of feed&#13;
efciency since they probably ate less and gained the same weight as&#13;
the heavier breeds that must have eaten more commensurate with their&#13;
maintenance requirements. The strongest residual correlation (r=0.98)&#13;
was between BW and BCS. Average band sharing frequencies ranged&#13;
from 0.60 in the crossbreds to 0.96 in the purebreds with estimated&#13;
inbreeding coefcients ranging from 0.5% to 3%, respectively, which&#13;
is very low.</p></div><table style="margin-bottom: 1em" border="0" cellpadding="3" class="not_ep_block"><tr><th valign="top" class="ep_row">Item Type:</th><td valign="top" class="ep_row">Article</td></tr><tr><th valign="top" class="ep_row">Keywords:</th><td valign="top" class="ep_row">RAPD Markers, Post-weaning Growth, Beef Cattle</td></tr><tr><th valign="top" class="ep_row">Subjects:</th><td valign="top" class="ep_row"><a href="http://eprints.utas.edu.au/view/subjects/270207.html">270000 Biological Sciences &gt; 270200 Genetics &gt; 270207 Quantitative Genetics</a><br /><a href="http://eprints.utas.edu.au/view/subjects/270899.html">270000 Biological Sciences &gt; 270800 Biotechnology &gt; 270899 Biotechnology not elsewhere classified</a><br /><a href="http://eprints.utas.edu.au/view/subjects/300401.html">300000 Agricultural, Veterinary and Environmental Sciences &gt; 300400 Animal Production &gt; 300401 Animal Breeding</a><br /><a href="http://eprints.utas.edu.au/view/subjects/300406.html">300000 Agricultural, Veterinary and Environmental Sciences &gt; 300400 Animal Production &gt; 300406 Animal Growth and Development</a></td></tr><tr><th valign="top" class="ep_row">Collections:</th><td valign="top" class="ep_row">UNSPECIFIED</td></tr><tr><th valign="top" class="ep_row">ID Code:</th><td valign="top" class="ep_row">2802</td></tr><tr><th valign="top" class="ep_row">Deposited By:</th><td valign="top" class="ep_row"><span class="ep_name_citation"><span class="person_name">Dr Aduli E.O. Malau-Aduli</span></span></td></tr><tr><th valign="top" class="ep_row">Deposited On:</th><td valign="top" class="ep_row">04 Jan 2008 11:57</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">24 Jan 2008 11:05</td></tr><tr><th valign="top" class="ep_row">ePrint Statistics:</th><td valign="top" class="ep_row"><a target="ePrintStats" href="/es/index.php?action=show_detail_eprint;id=2802;">View statistics for this ePrint</a></td></tr></table><p align="right">Repository Staff Only: <a href="http://eprints.utas.edu.au/cgi/users/home?screen=EPrint::View&amp;eprintid=2802">item control page</a></p>
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