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    <title>UTas ePrints - Genetic and phenotypic factors inuencing milk, protein and fat yields of dairy cows in Tasmania, Australia</title>
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    <meta content="Adediran, S.A." name="eprints.creators_name" />
<meta content="Nish, P." name="eprints.creators_name" />
<meta content="Donaghy, D.J." name="eprints.creators_name" />
<meta content="Roche, J.R." name="eprints.creators_name" />
<meta content="Malau-Aduli, A.E.O." name="eprints.creators_name" />
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<meta content="Genetic and phenotypic factors inuencing milk, protein
and fat yields of dairy cows in Tasmania, Australia" name="eprints.title" />
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<meta content="The Australian State of Tasmania enjoys a cool, temperate climate that
remains the backbone of its pasture-based dairy production system. In
this study, 330,366 lactation records from 428 Tasmanian dairy herds
collected between 2000 and 2005 were analysed. The objective was
to determine the inuence of genetic and non-genetic factors on milk,
protein and fat yields of pasture-based dairy cows. The data were
statistically subjected to analyses of variance using general linear
mixed model procedures with repeated measures. State-wide average
milk yield per lactation over a standard 305-day lactation length was
5200.7 ± 1239.7 litres (ranging from 1107 to 13256 litres), while fat
and protein yields averaged 205.5 ± 47.0 kg (ranging from 53 to 385
kg) and 166.2 ± 41.5 kg (ranging from 47 to 297 kg), respectively.
Highly signicant (P<0.001) effects on milk, protein and fat yields
attributable to variation in herd size, cow’s parity, breed, season and
year of calving were detected. Milk yield increased linearly with
increase in parity (means of 3482.4, 4019.5, 4615.4, 4826.1 and
5018.8 litres per lactation for parities 1, 2, 3, 4 and >4, respectively).
Milk, fat and protein yields were highest in cows calving during
the spring season (4769.8 litres, 215.2kg and 168 kg respectively),
Holstein-Friesian genotypes produced the most milk (5211 litres),
protein (171 kg) and fat (210kg) yields per lactation. Herd sizes of more
than 1110 cows produced the most milk, fat and protein. Productivity
per cow increased with calving year except in 2003 when total milk
yield was lower than in 2002. We conclude that herd size, breed,
parity, season and year of calving were among the main factors
driving production of dairy cows in Tasmania and adjustments for
these factors would be mandatory for any unbiased comparison
of lactation performance within and between pasture-based dairy
production systems." name="eprints.abstract" />
<meta content="2007-07-08" name="eprints.date" />
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and fat yields of dairy cows in Tasmania, Australia" name="DC.title" />
<meta content="Adediran, S.A." name="DC.creator" />
<meta content="Nish, P." name="DC.creator" />
<meta content="Donaghy, D.J." name="DC.creator" />
<meta content="Roche, J.R." name="DC.creator" />
<meta content="Malau-Aduli, A.E.O." name="DC.creator" />
<meta content="270200 Genetics" name="DC.subject" />
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<meta content="The Australian State of Tasmania enjoys a cool, temperate climate that
remains the backbone of its pasture-based dairy production system. In
this study, 330,366 lactation records from 428 Tasmanian dairy herds
collected between 2000 and 2005 were analysed. The objective was
to determine the inuence of genetic and non-genetic factors on milk,
protein and fat yields of pasture-based dairy cows. The data were
statistically subjected to analyses of variance using general linear
mixed model procedures with repeated measures. State-wide average
milk yield per lactation over a standard 305-day lactation length was
5200.7 ± 1239.7 litres (ranging from 1107 to 13256 litres), while fat
and protein yields averaged 205.5 ± 47.0 kg (ranging from 53 to 385
kg) and 166.2 ± 41.5 kg (ranging from 47 to 297 kg), respectively.
Highly signicant (P<0.001) effects on milk, protein and fat yields
attributable to variation in herd size, cow’s parity, breed, season and
year of calving were detected. Milk yield increased linearly with
increase in parity (means of 3482.4, 4019.5, 4615.4, 4826.1 and
5018.8 litres per lactation for parities 1, 2, 3, 4 and >4, respectively).
Milk, fat and protein yields were highest in cows calving during
the spring season (4769.8 litres, 215.2kg and 168 kg respectively),
Holstein-Friesian genotypes produced the most milk (5211 litres),
protein (171 kg) and fat (210kg) yields per lactation. Herd sizes of more
than 1110 cows produced the most milk, fat and protein. Productivity
per cow increased with calving year except in 2003 when total milk
yield was lower than in 2002. We conclude that herd size, breed,
parity, season and year of calving were among the main factors
driving production of dairy cows in Tasmania and adjustments for
these factors would be mandatory for any unbiased comparison
of lactation performance within and between pasture-based dairy
production systems." name="DC.description" />
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    <h1 class="ep_tm_pagetitle">Genetic and phenotypic factors inuencing milk, protein and fat yields of dairy cows in Tasmania, Australia</h1>
    <p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Adediran, S.A.</span> and <span class="person_name">Nish, P.</span> and <span class="person_name">Donaghy, D.J.</span> and <span class="person_name">Roche, J.R.</span> and <span class="person_name">Malau-Aduli, A.E.O.</span> (2007) <xhtml:em>Genetic and phenotypic factors inuencing milk, protein and fat yields of dairy cows in Tasmania, Australia.</xhtml:em> Journal of Animal Science, 85 (Suppl 1). 54. 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_3708' );" href="http://eprints.utas.edu.au/2800/1/Adediran_et_al_2007a_JAnimSci85Suppl1pg54.pdf" onmouseout="EPJS_HidePreview( event, 'doc_preview_3708' );"><img alt="[img]" src="http://eprints.utas.edu.au/style/images/fileicons/application_pdf.png" class="ep_doc_icon" border="0" /></a><div class="ep_preview" id="doc_preview_3708"><table><tr><td><img alt="" src="http://eprints.utas.edu.au/2800/thumbnails/1/preview.png" class="ep_preview_image" border="0" /><div class="ep_preview_title">Preview</div></td></tr></table></div></td><td valign="top"><a href="http://eprints.utas.edu.au/2800/1/Adediran_et_al_2007a_JAnimSci85Suppl1pg54.pdf"><span class="ep_document_citation">PDF</span></a> - Requires a PDF viewer<br />539Kb</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 Australian State of Tasmania enjoys a cool, temperate climate that&#13;
remains the backbone of its pasture-based dairy production system. In&#13;
this study, 330,366 lactation records from 428 Tasmanian dairy herds&#13;
collected between 2000 and 2005 were analysed. The objective was&#13;
to determine the inuence of genetic and non-genetic factors on milk,&#13;
protein and fat yields of pasture-based dairy cows. The data were&#13;
statistically subjected to analyses of variance using general linear&#13;
mixed model procedures with repeated measures. State-wide average&#13;
milk yield per lactation over a standard 305-day lactation length was&#13;
5200.7 ± 1239.7 litres (ranging from 1107 to 13256 litres), while fat&#13;
and protein yields averaged 205.5 ± 47.0 kg (ranging from 53 to 385&#13;
kg) and 166.2 ± 41.5 kg (ranging from 47 to 297 kg), respectively.&#13;
Highly signicant (P&lt;0.001) effects on milk, protein and fat yields&#13;
attributable to variation in herd size, cow’s parity, breed, season and&#13;
year of calving were detected. Milk yield increased linearly with&#13;
increase in parity (means of 3482.4, 4019.5, 4615.4, 4826.1 and&#13;
5018.8 litres per lactation for parities 1, 2, 3, 4 and &gt;4, respectively).&#13;
Milk, fat and protein yields were highest in cows calving during&#13;
the spring season (4769.8 litres, 215.2kg and 168 kg respectively),&#13;
Holstein-Friesian genotypes produced the most milk (5211 litres),&#13;
protein (171 kg) and fat (210kg) yields per lactation. Herd sizes of more&#13;
than 1110 cows produced the most milk, fat and protein. Productivity&#13;
per cow increased with calving year except in 2003 when total milk&#13;
yield was lower than in 2002. We conclude that herd size, breed,&#13;
parity, season and year of calving were among the main factors&#13;
driving production of dairy cows in Tasmania and adjustments for&#13;
these factors would be mandatory for any unbiased comparison&#13;
of lactation performance within and between pasture-based dairy&#13;
production systems.</p></div><table style="margin-bottom: 1em" cellpadding="3" class="not_ep_block" border="0"><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">Milk, Protein, Fat, Tasmania</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/270200.html">270000 Biological Sciences &gt; 270200 Genetics</a><br /><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/300401.html">300000 Agricultural, Veterinary and Environmental Sciences &gt; 300400 Animal Production &gt; 300401 Animal Breeding</a></td></tr><tr><th valign="top" class="ep_row">ID Code:</th><td valign="top" class="ep_row">2800</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 12:02</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">09 Jan 2008 02:30</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=2800;">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=2800">item control page</a></p>
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