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<blockquote data-quote="HerefordSire" data-source="post: 381147" data-attributes="member: 4437"><p>The decrease in inbreeding during the 1970s was of</p><p>particular interest in the study. The additional analysis</p><p>performed demonstrated that the decrease could have</p><p>been due to two separate breeder actions: 1) a shift in</p><p>the lines used (as reflected in the decrease in genetic</p><p>relationship between the most heavily used bulls), and</p><p>2) <strong>outcrossing to imported breeding stock that, from the</strong></p><p><strong>American Hereford Association's records, had unknown</strong></p><p><strong>parentage</strong>. Although both of these factors may have</p><p>caused the decrease in average inbreeding, this effect</p><p>was transient, as inbreeding started increasing again</p><p>in the 1990s. The analysis that evaluated animals with</p><p>at least 12 generation pedigrees also was instructive,</p><p>as it provided an upper limit of inbreeding levels.</p><p></p><p></p><p>I located the actual document and can be accessed here:</p><p></p><p><a href="http://jas.fass.org/cgi/reprint/83/5/992.pdf" target="_blank">http://jas.fass.org/cgi/reprint/83/5/992.pdf</a></p></blockquote><p></p>
[QUOTE="HerefordSire, post: 381147, member: 4437"] The decrease in inbreeding during the 1970s was of particular interest in the study. The additional analysis performed demonstrated that the decrease could have been due to two separate breeder actions: 1) a shift in the lines used (as reflected in the decrease in genetic relationship between the most heavily used bulls), and 2) [b]outcrossing to imported breeding stock that, from the American Hereford Association’s records, had unknown parentage[/b]. Although both of these factors may have caused the decrease in average inbreeding, this effect was transient, as inbreeding started increasing again in the 1990s. The analysis that evaluated animals with at least 12 generation pedigrees also was instructive, as it provided an upper limit of inbreeding levels. I located the actual document and can be accessed here: [url=http://jas.fass.org/cgi/reprint/83/5/992.pdf]http://jas.fass.org/cgi/reprint/83/5/992.pdf[/url] [/QUOTE]
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