{"id":1507,"date":"2023-04-12T12:30:19","date_gmt":"2023-04-12T12:30:19","guid":{"rendered":"https:\/\/crs.izoo.krakow.pl\/wiki\/?post_type=docs&#038;p=1507"},"modified":"2023-04-12T12:30:20","modified_gmt":"2023-04-12T12:30:20","slug":"evaluation-of-the-breeding-value-of-workability-traits-for-cows","status":"publish","type":"docs","link":"https:\/\/crs.izoo.krakow.pl\/wiki\/en\/docs\/evaluation-of-the-breeding-value-of-workability-traits-for-cows\/","title":{"rendered":"Evaluation of the breeding value of workability traits for cows."},"content":{"rendered":"\n<p>The milking speed is evaluated on a scale of 1 (very slow) to 5 (very fast), and milking temperament on a scale of 1 (slow and gentle animal) to 3 (excitable or aggressive animal). Trained zootechnicians assess the phenotypic evaluation of cows in terms of milking traits during the second test milking in the first lactation.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td>Trait<\/td><td>h<sup>2<\/sup><\/td><\/tr><tr><td>Milking speed<\/td><td>0.12<\/td><\/tr><tr><td>Milking temperament<\/td><td>0.09<\/td><\/tr><\/tbody><\/table><figcaption class=\"wp-element-caption\">Heritability of workability traits<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Model<\/h2>\n\n\n\n<p>Breeding values for workability traits were estimated using the BLUP method &#8211; a multi-trait animal model that takes into account the following factors in a linear model: linear and quadratic regression on cow age at calving, a constant effect of herd-year-season-classifier, a constant effect of lactation stage at which the phenotypic evaluation was made, as well as a random additive animal effect and the influence of random error.<\/p>\n\n\n\n<p>Breeding values for both 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.<\/p>\n\n\n\n<p>For milking speed (MS), a higher breeding value of the bull indicates that his daughters on average have a faster milking. For milking temperament (MT), a higher breeding value of the bull indicates that his daughters are generally calmer.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Genetic database<\/h2>\n\n\n\n<p>The genetic base was taken as the average breeding value of bulls born between 2009-2011, evaluated based on at least 20 daughters in at least 10 heards.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The milking speed is evaluated on a scale of 1 (very slow) to 5 (very fast), and milking temperament on a scale of 1 (slow and gentle animal) to 3 [&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-1507","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\/1507","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=1507"}],"version-history":[{"count":1,"href":"https:\/\/crs.izoo.krakow.pl\/wiki\/wp-json\/wp\/v2\/docs\/1507\/revisions"}],"predecessor-version":[{"id":1508,"href":"https:\/\/crs.izoo.krakow.pl\/wiki\/wp-json\/wp\/v2\/docs\/1507\/revisions\/1508"}],"wp:attachment":[{"href":"https:\/\/crs.izoo.krakow.pl\/wiki\/wp-json\/wp\/v2\/media?parent=1507"}],"wp:term":[{"taxonomy":"doc_category","embeddable":true,"href":"https:\/\/crs.izoo.krakow.pl\/wiki\/wp-json\/wp\/v2\/doc_category?post=1507"},{"taxonomy":"doc_tag","embeddable":true,"href":"https:\/\/crs.izoo.krakow.pl\/wiki\/wp-json\/wp\/v2\/doc_tag?post=1507"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}