{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,11,10]],"date-time":"2026-11-10T02:01:25Z","timestamp":1794276085411,"version":"4.9.0"},"reference-count":14,"publisher":"Springer Science and Business Media LLC","issue":"1","license":[{"start":{"date-parts":[[2015,11,14]],"date-time":"2015-11-14T00:00:00Z","timestamp":1447459200000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"},{"start":{"date-parts":[[2015,11,14]],"date-time":"2015-11-14T00:00:00Z","timestamp":1447459200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"}],"funder":[{"name":"Swedish-Norwegian Foundation of Equine research","award":["H0947094"],"award-info":[{"award-number":["H0947094"]}]}],"content-domain":{"domain":["link.springer.com"],"crossmark-restriction":false},"short-container-title":["Acta Vet Scand"],"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Background<\/jats:title>\n                    <jats:p>Pregnancy rates with cooled equine semen can be unsatisfactory and show great variation. Information about first cycle pregnancy rates and pregnancy rates per cycle are often lacking from publicly available records. This retrospective cohort study was performed to evaluate the fertility of the Norwegian Coldblooded trotter. The aim of the study was to compare the breeding results after insemination with fresh, extended with those of cooled, shipped semen among Norwegian Coldblooded trotter mares. First cycle pregnancy rate was the main parameter used to measure fertility. Stud-books were collected from four studs from the years 2006\u20132010. Statistical analyses were done in Stata using Chi square test and multivariable analyses where different models were compared based on Akaike\u2019s information criterion.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      First cycle pregnancy rate, seasonal pregnancy rate and foaling rate all showed significant differences (\n                      <jats:italic>P<\/jats:italic>\n                      \u00a0&lt;\u00a00.0001) when comparing mares inseminated at stud with mares inseminated with cooled, shipped semen, favoring artificial insemination (AI) at stud. First cycle pregnancy rate was 55.1\u00a0% for mares inseminated at stud with fresh extended semen and 42.2\u00a0% for mares inseminated with cooled shipped semen. The overall pregnancy rate per cycle was 84.4\u00a0% for AI at stud and 66.9\u00a0% for cooled, shipped semen. The parameters stud, mare age, number of inseminations within an estrus cycle and individual stallion were also investigated for influence on fertility.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Few retrospective studies include the parameter of first cycle pregnancy rates. Our study does not differ dramatically when comparing seasonal pregnancy rates and foaling rates with similar studies. Fertility parameters for the Norwegian Coldblooded trotter do not differ significantly from most other studies of Coldblooded mares and other mare breeds around the world. But the difference in fertility parameters between AI at stud to AI with cooled semen between our study and others, indicates that higher pregnancy rates in Norwegian Coldblooded trotter may be possible.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1186\/s13028-015-0161-8","type":"journal-article","created":{"date-parts":[[2015,11,14]],"date-time":"2015-11-14T06:28:50Z","timestamp":1447482530000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["A retrospective cohort study on fertility in the Norwegian Coldblooded trotter after artificial insemination with cooled, shipped versus fresh extended semen"],"prefix":"10.1186","volume":"57","author":[{"given":"Caroline Sorknes","family":"Haadem","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ane","family":"N\u00f8dtvedt","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wenche","family":"Farstad","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ragnar","family":"Thomassen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2015,11,14]]},"reference":[{"key":"161_CR1","unstructured":"Pickett BW, McKinnon AO, Squires EL, Norris RC. Procedures for collection, evaluation and utilization of stallion semen for artificial insemination. Bulletin of Colorado State University, Animal Reproduction Laboratory. Animal Reproduction Laboratory, Colorado State University; 1987."},{"key":"161_CR2","doi-asserted-by":"publisher","first-page":"583","DOI":"10.1051\/rnd:2004055","volume":"44","author":"B Langlois","year":"2004","unstructured":"Langlois B, Blouin C. Statistical analysis of some factors affecting the number of horse births in France. Reprod Nutr Dev. 2004;44:583\u201395.","journal-title":"Reprod Nutr Dev"},{"key":"161_CR3","doi-asserted-by":"publisher","first-page":"31","DOI":"10.1016\/0301-6226(94)90263-1","volume":"40","author":"BW Pickett","year":"1994","unstructured":"Pickett BW, Shiner KA. Recent developments in artificial insemination in horses. Livest Prod Sci. 1994;40:31\u20136.","journal-title":"Livest Prod Sci"},{"key":"161_CR4","unstructured":"Jasko DJ, Moran DM, Farlin ME, Squires EL, Amann RP, Pickett BW. Pregnancy rates utilizing fresh, cooled, and frozen-thawed stallion semen. Proceedings of the 38th annual convention of the American Association of Equine Practitioners. 1992;649\u201360."},{"key":"161_CR5","doi-asserted-by":"publisher","first-page":"1153","DOI":"10.1016\/S0093-691X(03)00113-4","volume":"60","author":"H Sieme","year":"2003","unstructured":"Sieme H, Sch\u00e4fer T, Stout TAE, Klug E, Waberski D. The effects of different insemination regimes on fertility in mares. Theriogenology. 2003;60:1153\u201364.","journal-title":"Theriogenology"},{"key":"161_CR6","doi-asserted-by":"publisher","first-page":"40","DOI":"10.1186\/1751-0147-52-40","volume":"52","author":"T Katila","year":"2010","unstructured":"Katila T, Reilas T, Nivola K, Peltonen T, Virtala AM. 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