{"id":1533,"date":"2023-04-20T09:20:05","date_gmt":"2023-04-20T09:20:05","guid":{"rendered":"https:\/\/crs.izoo.krakow.pl\/wiki\/?post_type=docs&#038;p=1533"},"modified":"2023-04-20T09:20:06","modified_gmt":"2023-04-20T09:20:06","slug":"evaluation-of-breeding-value-of-bulls-in-terms-of-fertility-traits","status":"publish","type":"docs","link":"https:\/\/crs.izoo.krakow.pl\/wiki\/en\/docs\/evaluation-of-breeding-value-of-bulls-in-terms-of-fertility-traits\/","title":{"rendered":"Evaluation of breeding value of bulls in terms of fertility traits."},"content":{"rendered":"\n<h3 class=\"wp-block-heading\">Four fertility traits were evaluated:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Cow pregnancy rate (CRj)<\/li>\n\n\n\n<li>Heifer pregnancy rate (CRk)<\/li>\n\n\n\n<li>Days in postpartum interval (PP) &#8211; the time interval between first calving and first insemination.<\/li>\n\n\n\n<li>Days open (OMC) &#8211; the time interval between first calving and subsequent conception.<\/li>\n<\/ul>\n\n\n\n<p>The CRj and CRk indicators are defined as CR = 100 \/ the number of inseminations from the first to the successful one. If the series consisted of more than 15 procedures or none of the procedures were 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\">Table 1. Heritabilities (on the diagonal), as well as genetic (above diagonal) and phenotypic (below diagonal) correlations between fertility traits.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Model<\/h2>\n\n\n\n<p>Warto\u015bci hodowlane cech p\u0142odno\u015bci oszacowano metod\u0105 BLUP &#8211; wielocechowy model zwierz\u0119cia, uwzgl\u0119dniaj\u0105c w modelu liniowym nast\u0119puj\u0105ce wp\u0142ywy:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>dla CRj i CRk: sta\u0142y efekt miesi\u0105ca inseminacji, sta\u0142\u0105 regresj\u0119 na wiek pierwszej inseminacji, losowy efekt stada-roku pierwszej inseminacji, addytywny efekt zwierz\u0119cia,<\/li>\n\n\n\n<li>dla PP i OMC: sta\u0142e efekty stada-roku i miesi\u0105ca ocielenia oraz regresja na wiek krowy przy ocieleniu,<\/li>\n<\/ol>\n\n\n\n<p>Warto\u015bci hodowlane dla wszystkich cech wyra\u017cono jako odchylenia od \u015bredniej bazy, a nast\u0119pnie przekszta\u0142cono na zmienn\u0105 o \u015bredniej 100 i odchyleniu standardowym 10. Dla CRj i CRk wy\u017csza warto\u015b\u0107 hodowlana buhaja oznacza, \u017ce przeci\u0119tnie na skuteczne unasienienie jego c\u00f3rek przypada mniej zabieg\u00f3w inseminacyjnych. Wy\u017csza warto\u015b\u0107 hodowlana buhaja pod wzgl\u0119dem OMC lub PP oznacza kr\u00f3tsze odst\u0119py mi\u0119dzyocieleniowe lub przestoje poporodowe c\u00f3rek.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Genetic base<\/h2>\n\n\n\n<p>The genetic base is 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<h2 class=\"wp-block-heading\">Repeatability of evaluation<\/h2>\n\n\n\n<p>The repeatability (accuracy) of the evaluation was calculated using an approximation for the multivariate method BLUP animal model.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Conditions for accepting the evaluation<\/h2>\n\n\n\n<p>The condition for accepting and publishing breeding values for fertility traits is that the evaluation is based on at least 10 daughters.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Fertility traits sub-index<\/h2>\n\n\n\n<p>The fertility sub-index PI_FERTILITY:<\/p>\n\n\n\n<p><strong>PI_FERTILITY = 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 sub-index is standardized to a mean of 100 and a standard deviation of 10.<\/p>\n\n\n\n<p>The fertility sub-index includes the breeding value for CRj (based on at least 10 effective daughters) and for CRk, PP, and OMC (evaluated with a repeatability of at least 0.10). Since a direct evaluation of these traits is not possible for young bulls, their breeding values are estimated using a multivariate model that allows for obtaining breeding values based on known genetic correlations. In this case, the breeding values of these traits, which are not recognized as official due to low accuracy (less than 10 daughters), are still used to calculate the fertility sub-index.<\/p>\n\n\n\n<p>The sub-index is calculated based on international evaluations. If a bull does not have an international evaluation for a particular trait but a national evaluation is available, the sub-index is calculated entirely based on the national evaluation.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Four fertility traits were evaluated: The CRj and CRk indicators are defined as CR = 100 \/ the number of inseminations from the first to the successful one. If the [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":0,"parent":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"doc_category":[63],"doc_tag":[115],"class_list":["post-1533","docs","type-docs","status-publish","hentry","doc_category-conventional-estimation-of-bulls-breeding-values","doc_tag-wh-en"],"_links":{"self":[{"href":"https:\/\/crs.izoo.krakow.pl\/wiki\/wp-json\/wp\/v2\/docs\/1533","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=1533"}],"version-history":[{"count":1,"href":"https:\/\/crs.izoo.krakow.pl\/wiki\/wp-json\/wp\/v2\/docs\/1533\/revisions"}],"predecessor-version":[{"id":1534,"href":"https:\/\/crs.izoo.krakow.pl\/wiki\/wp-json\/wp\/v2\/docs\/1533\/revisions\/1534"}],"wp:attachment":[{"href":"https:\/\/crs.izoo.krakow.pl\/wiki\/wp-json\/wp\/v2\/media?parent=1533"}],"wp:term":[{"taxonomy":"doc_category","embeddable":true,"href":"https:\/\/crs.izoo.krakow.pl\/wiki\/wp-json\/wp\/v2\/doc_category?post=1533"},{"taxonomy":"doc_tag","embeddable":true,"href":"https:\/\/crs.izoo.krakow.pl\/wiki\/wp-json\/wp\/v2\/doc_tag?post=1533"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}