{"id":1500,"date":"2023-04-12T05:22:14","date_gmt":"2023-04-12T05:22:14","guid":{"rendered":"https:\/\/crs.izoo.krakow.pl\/wiki\/?post_type=docs&#038;p=1500"},"modified":"2023-04-12T05:22:15","modified_gmt":"2023-04-12T05:22:15","slug":"evaluation-of-the-breeding-value-of-cows-fertility-traits","status":"publish","type":"docs","link":"https:\/\/crs.izoo.krakow.pl\/wiki\/en\/docs\/evaluation-of-the-breeding-value-of-cows-fertility-traits\/","title":{"rendered":"Evaluation of the breeding value of cows fertility traits."},"content":{"rendered":"\n<p>Four fertility traits were evaluated:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>wsp\u00f3\u0142czynnik zap\u0142odnienia ja\u0142\u00f3wek (CRj)<\/li>\n\n\n\n<li>wsp\u00f3\u0142czynnik zap\u0142odnienia kr\u00f3w (CRk)<\/li>\n\n\n\n<li>d\u0142ugo\u015b\u0107 przestoju poporodowgo (PP) &#8211; odst\u0119p czasu od pierwszego ocielenia do pierwszego zabiegu unasieniania.<\/li>\n\n\n\n<li>d\u0142ugo\u015b\u0107 okresu mi\u0119dzyci\u0105\u017cowego (OMC) &#8211; odst\u0119p czasu od pierwszego ocielenia do ponownego zacielenia.<\/li>\n<\/ul>\n\n\n\n<p>The CRj and CRk indices were determined as CR = 100\/number of inseminations from first to successful. If the series consisted of more than 15 inseminations or no insemination was marked as successful, then CR = 100\/16.<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><tbody><tr><td><strong>Trait<\/strong><\/td><td><strong>CRj<\/strong><\/td><td><strong>CRk<\/strong><\/td><td><strong>PP<\/strong><\/td><td><strong>OMC<\/strong><\/td><\/tr><tr><td><strong>CRj<\/strong><\/td><td><strong>0.027<\/strong><\/td><td>0.483<\/td><td>0.581<\/td><td>-0.012<\/td><\/tr><tr><td><strong>CRk<\/strong><\/td><td>0.056<\/td><td><strong>0.025<\/strong><\/td><td>0.024<\/td><td>0.022<\/td><\/tr><tr><td><strong>PP<\/strong><\/td><td>-0.003<\/td><td>0.043<\/td><td><strong>0.053<\/strong><\/td><td>0.713<\/td><\/tr><tr><td><strong>OMC<\/strong><\/td><td>-0.005<\/td><td>-0.215<\/td><td>0.609<\/td><td><strong>0.080<\/strong><\/td><\/tr><\/tbody><\/table><figcaption class=\"wp-element-caption\">Heritability (on the diagonal) and genetic correlations (above the diagonal) and phenotypic correlations (below the diagonal) between fertility traits.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Model<\/h2>\n\n\n\n<p>Breeding values for fertility traits were estimated using the BLUP method &#8211; a multi-trait animal model, taking into account the following effects in the linear model:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>For CRj and CRk: fixed effect of insemination month, fixed regression on age at first insemination, random effect of herd-year of first insemination, and additive effect of the animal.<\/li>\n\n\n\n<li>For PP and OMC: fixed effects of herd-year and month of calving, as well as regression on cow&#8217;s age at calving.<\/li>\n<\/ol>\n\n\n\n<p>Breeding values for all traits were expressed as deviations from the base average and then transformed into a variable with a mean of 100 and a standard deviation of 10. For CRj and CRk, a higher breeding value means that on average, fewer insemination procedures are needed for successful breeding. A higher breeding value for OMC or PP indicates shorter intervals between calvings or postpartum periods.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Genetic database<\/h2>\n\n\n\n<p>The genetic base was set as the average breeding value of bulls born between 2009-2011, evaluated based on at least 50 daughters from at least 30 herds.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Subindex of fertility traits<\/h3>\n\n\n\n<p>Fertility subindex PI_P\u0141OD:<\/p>\n\n\n\n<p><strong>PI_P\u0141OD = 0.70 \u00d7 CRj + 0.10 \u00d7 CRk + 0.10 \u00d7 PP + 0.10 \u00d7 OMC<\/strong><\/p>\n\n\n\n<p>The fertility subindex has been standardized to a mean of 100 and a standard deviation of 10.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Four fertility traits were evaluated: The CRj and CRk indices were determined as CR = 100\/number of inseminations from first to successful. If the series consisted of more than 15 [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":0,"parent":0,"comment_status":"open","ping_status":"closed","template":"","meta":{"footnotes":""},"doc_category":[69],"doc_tag":[115],"class_list":["post-1500","docs","type-docs","status-publish","hentry","doc_category-conventional-estimation-cows-breeding-values","doc_tag-wh-en"],"_links":{"self":[{"href":"https:\/\/crs.izoo.krakow.pl\/wiki\/wp-json\/wp\/v2\/docs\/1500","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/crs.izoo.krakow.pl\/wiki\/wp-json\/wp\/v2\/docs"}],"about":[{"href":"https:\/\/crs.izoo.krakow.pl\/wiki\/wp-json\/wp\/v2\/types\/docs"}],"author":[{"embeddable":true,"href":"https:\/\/crs.izoo.krakow.pl\/wiki\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/crs.izoo.krakow.pl\/wiki\/wp-json\/wp\/v2\/comments?post=1500"}],"version-history":[{"count":1,"href":"https:\/\/crs.izoo.krakow.pl\/wiki\/wp-json\/wp\/v2\/docs\/1500\/revisions"}],"predecessor-version":[{"id":1501,"href":"https:\/\/crs.izoo.krakow.pl\/wiki\/wp-json\/wp\/v2\/docs\/1500\/revisions\/1501"}],"wp:attachment":[{"href":"https:\/\/crs.izoo.krakow.pl\/wiki\/wp-json\/wp\/v2\/media?parent=1500"}],"wp:term":[{"taxonomy":"doc_category","embeddable":true,"href":"https:\/\/crs.izoo.krakow.pl\/wiki\/wp-json\/wp\/v2\/doc_category?post=1500"},{"taxonomy":"doc_tag","embeddable":true,"href":"https:\/\/crs.izoo.krakow.pl\/wiki\/wp-json\/wp\/v2\/doc_tag?post=1500"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}