Over the past 40 yr, litter size has
\nimproved due to management changes, use of superior
\ndam lines, and through crossbreeding. Selection
\nfor litter size has been reasonably successful in
\nmice, but the response in
\npigs has been extremely variable.
\nThe development of genome maps offers the opportunity
\nto identify individual genes controlling
\nreproduction. More recently, associations with genetic variation
\nat the pig estrogen receptor (ESR) locus have
\nbeen discovered. Therefore, the objectives of this research
\nwas to evaluate the effect of the ESR locus on litter
\nsize in a large sample of pigs from four commercial
\nlines and to measure pleiotropic effects on growth and
\ncarcass traits. The effect of the estrogen receptor (ESR) locus on
\nlitter size was demonstrated in a large sample of pigs
\nfrom four commercial lines in which the B allele was
\npresent. It was found that the potential economic value from marker-assisted
\nselection using the B ESR allele is considerable.
\nIn addition to the positive effects of the ESR B allele
\nfor litter size, a small favorable response was detected
\nin backfat thickness associated with a small decrease
\nin average daily feed intake but no effect on growth
\nrate. Therefore, selection for prolificacy based in part
\non ESR genotype should not adversely affect growth
\nand carcass traits. The only negative effect was a
\nslight reduction in teat number. The use of this
\ngenotype offers a clear example of economically useful
\nmarker-assisted selection in pigs.<\/p>\n","protected":false},"excerpt":{"rendered":"
Over the past 40 yr, litter size has improved due to management changes, use of superior dam lines, and through crossbreeding. Selection for litter size has been reasonably successful in mice, but the response in pigs has been extremely variable. The development of genome maps offers the opportunity to identify individual genes controlling reproduction. More […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[930],"tags":[8882,10033,13816,1464,4262,2349,2344,231,19644,18867,8520,1898,2851,6904,46,925,3804,1899,20007,158,5381,818,1318,1900,48,8791,10858,14784,22808,14,33,16262,1901,17743,27282,1902,14980,1533,24626,20911,6053,1055],"class_list":["post-4777","post","type-post","status-publish","format-standard","hentry","category-production","tag-al","tag-arc","tag-ass","tag-average-daily-feed-intake","tag-backfat","tag-breed","tag-breeding","tag-cover","tag-dd","tag-effect-of-the-estrogen-receptor-locus-on-reproduction-and-production-traits-in-four-commercial-pig-lines","tag-esr-swine","tag-estrogen-receptors","tag-fat","tag-fee","tag-feed","tag-feed-intake","tag-genetic","tag-genetic-markers","tag-gh","tag-growth","tag-light","tag-litter","tag-litter-size","tag-major-genes","tag-management","tag-map","tag-mark","tag-ness","tag-pic","tag-pig","tag-pigs","tag-pl","tag-pleiotropy","tag-prod","tag-production","tag-reproduction","tag-search","tag-size","tag-swine-estrogen-receptor-esr","tag-t","tag-use","tag-variation"],"_links":{"self":[{"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/posts\/4777","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/comments?post=4777"}],"version-history":[{"count":0,"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/posts\/4777\/revisions"}],"wp:attachment":[{"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/media?parent=4777"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/categories?post=4777"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/prairieswine.com\/rsc\/wp-json\/wp\/v2\/tags?post=4777"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}