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    <title>UTas ePrints - Estimates of genetic and phenotypic parameters for dairy traits in Friesian-Bunaji crossbreds</title>
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    <meta content="Malau-Aduli, A.E.O." name="eprints.creators_name" />
<meta content="Abubakar, B.Y." name="eprints.creators_name" />
<meta content="Dim, N.I." name="eprints.creators_name" />
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<meta content="Estimates of genetic and phenotypic parameters for dairy traits in Friesian-Bunaji crossbreds " name="eprints.title" />
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<meta content="Genetic, phenotypic, heritabilities, variance components, correlations, repeatabilities, lactation, growth, calving interval, dry period" name="eprints.keywords" />
<meta content="In: W.S. Pitchford (Editor). Breeding for Quality and Profit. Proceedings Australian Association of Animal Breeding and Genetics, The University of Adelaide, Adelaide, Australia, vol.11, 299-302." name="eprints.note" />
<meta content="Genetic and phenotypic parameters for dairy traits were computed using data on Friesian-Bunaji crossbred
cows collected over a twenty-three year period (1967-1989) from the dairy herd of the National Animal Production Research Institute Shika, Zaria, Nigeria. Estimated repeatabilities computed from variance components were 0.72 ± 0.06,0.60 ± 0.10,0.73 ± 0.02,0.53 ± 0.24 and 0.56 ± 0.18 for total lactation yield, lactation length, 305-day yield, calving interval and dry period, respectively.
Heritability estimates were 0.44 ± 0.07,0.52 ± 0.12,0.30 ± 0.13,0.18 ± 0.02,0.26 ± 0.08 and 0.27 ± 0.10 for total lactation yield, lactation length, 305-day yield, calving interval, dry period and age at first calving,respectively.
Genetic and phenotypic correlation coefficients between traits were medium to high, ranging from 0.30 to 0.95. The results of this study showed that the genetic response to selection in Friesian-Bunaji crosses for total lactation yield, 305-day yield and lactation length could be moderately high since the proportion of additive genetic variance was fairly high. Improvement programmes for age at first calving, calving interval and dry period should focus mostly on management, given their low heritability estimates.
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<meta content="BECKER, W.A. (1984). Manual of quantitative genetics”. Pulhnan, Washington: Academic Enterprises
BUVANENDRAN, V., OLAYIWOLE, M.B., PIOTROWSKA, K.I. and OYEJOLA, B.A. (1981). Anim. Prod. 32: 165
HARVEY, W.R. (1990). User’s guide for LSMLIMW and MIXMDL. Mimeo. 91
HENDERSON, C.R. (1953). Biometrics 9:226
MALAU-ADULI, A.E.O. and ABUBAKAR, B.Y. (1992). Nig. J. Anim. Prod. 19:141
ONI, O.O., BUVANENDRAN, V. and DIM, NJ. (1989). Trop. Agric. 111:407
PIKASH, L.P. (1990). Ref. Zhurnal 6:358
REDDY, K.M. and NAGARCENKAR, R. (1989). Indian Vet.J.66:825
SHARMA, A.P., KHAN, F.N. and JADHAV, S.R. (1987). Indian Vet. J. 64:770
ULUSAN, H.O.K. and OZCELIK, M. (1988). Vet. Facul. Derg. 35: 260
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<meta content="Malau-Aduli, A.E.O. and Abubakar, B.Y. and Dim, N.I. (1995) Estimates of genetic and phenotypic parameters for dairy traits in Friesian-Bunaji crossbreds. In: Australian Association of Animal Breeding and Genetics, July 1995, Adelaide." name="eprints.citation" />
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<meta content="Genetic and phenotypic parameters for dairy traits were computed using data on Friesian-Bunaji crossbred
cows collected over a twenty-three year period (1967-1989) from the dairy herd of the National Animal Production Research Institute Shika, Zaria, Nigeria. Estimated repeatabilities computed from variance components were 0.72 ± 0.06,0.60 ± 0.10,0.73 ± 0.02,0.53 ± 0.24 and 0.56 ± 0.18 for total lactation yield, lactation length, 305-day yield, calving interval and dry period, respectively.
Heritability estimates were 0.44 ± 0.07,0.52 ± 0.12,0.30 ± 0.13,0.18 ± 0.02,0.26 ± 0.08 and 0.27 ± 0.10 for total lactation yield, lactation length, 305-day yield, calving interval, dry period and age at first calving,respectively.
Genetic and phenotypic correlation coefficients between traits were medium to high, ranging from 0.30 to 0.95. The results of this study showed that the genetic response to selection in Friesian-Bunaji crosses for total lactation yield, 305-day yield and lactation length could be moderately high since the proportion of additive genetic variance was fairly high. Improvement programmes for age at first calving, calving interval and dry period should focus mostly on management, given their low heritability estimates.
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    <h1 class="ep_tm_pagetitle">Estimates of genetic and phenotypic parameters for dairy traits in Friesian-Bunaji crossbreds</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">Abubakar, B.Y.</span> and <span class="person_name">Dim, N.I.</span> (1995) <xhtml:em>Estimates of genetic and phenotypic parameters for dairy traits in Friesian-Bunaji crossbreds.</xhtml:em> In: Australian Association of Animal Breeding and Genetics, July 1995, Adelaide.</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_4056' );" onmouseout="EPJS_HidePreview( event, 'doc_preview_4056' );" href="http://eprints.utas.edu.au/3000/1/Malau-Aduli_1995AAABGAdelaideF-Bunaji.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_4056"><table><tr><td><img alt="" src="http://eprints.utas.edu.au/3000/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/3000/1/Malau-Aduli_1995AAABGAdelaideF-Bunaji.pdf"><span class="ep_document_citation">PDF</span></a> - Requires a PDF viewer<br />276Kb</td></tr></table><p style="margin-bottom: 1em" class="not_ep_block">Official URL: <a href="http://www.aaabg.org/livestocklibrary/1995/ab95111.pdf">http://www.aaabg.org/livestocklibrary/1995/ab95111.pdf</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">Genetic and phenotypic parameters for dairy traits were computed using data on Friesian-Bunaji crossbred&#13;
cows collected over a twenty-three year period (1967-1989) from the dairy herd of the National Animal Production Research Institute Shika, Zaria, Nigeria. Estimated repeatabilities computed from variance components were 0.72 ± 0.06,0.60 ± 0.10,0.73 ± 0.02,0.53 ± 0.24 and 0.56 ± 0.18 for total lactation yield, lactation length, 305-day yield, calving interval and dry period, respectively.&#13;
Heritability estimates were 0.44 ± 0.07,0.52 ± 0.12,0.30 ± 0.13,0.18 ± 0.02,0.26 ± 0.08 and 0.27 ± 0.10 for total lactation yield, lactation length, 305-day yield, calving interval, dry period and age at first calving,respectively.&#13;
Genetic and phenotypic correlation coefficients between traits were medium to high, ranging from 0.30 to 0.95. The results of this study showed that the genetic response to selection in Friesian-Bunaji crosses for total lactation yield, 305-day yield and lactation length could be moderately high since the proportion of additive genetic variance was fairly high. Improvement programmes for age at first calving, calving interval and dry period should focus mostly on management, given their low heritability estimates.&#13;
</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">Conference or Workshop Item (Paper)</td></tr><tr><th valign="top" class="ep_row">Additional Information:</th><td valign="top" class="ep_row">In: W.S. Pitchford (Editor). Breeding for Quality and Profit. Proceedings Australian Association of Animal Breeding and Genetics, The University of Adelaide, Adelaide, Australia, vol.11, 299-302.</td></tr><tr><th valign="top" class="ep_row">Keywords:</th><td valign="top" class="ep_row">Genetic, phenotypic, heritabilities, variance components, correlations, repeatabilities, lactation, growth, calving interval, dry period</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><br /><a href="http://eprints.utas.edu.au/view/subjects/300400.html">300000 Agricultural, Veterinary and Environmental Sciences &gt; 300400 Animal Production</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">3000</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">31 Jan 2008 14:32</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">31 Jan 2008 14:32</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=3000;">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=3000">item control page</a></p>
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