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A second aim was to determine the influence of some intrinsic and extrinsic factors and their interactions, including characteristics of the animals such as age, season, farm, sire, and AI technician on the response to both procedures. A retrospective analysis was performed from a data base of 120.807 AIs of healthy cows with at least 40\u201370\u00a0days post\u2010partum at first service. Overall, FTAI achieved slighter greater pregnancy rates than insemination after detected oestrus. The second AI seems to be a key insemination as effects of sire and technician were greater than in the following ones. The use of FTAI or SEAI in one AI did not affect the results of the following AIs, regardless if FTAI or SEAI procedures were used in that AI. Technician had greater variation than sire or farm on final pregnancy rate. The results of each sire for pregnancy rate varied according to the type of insemination, with sires achieving greater results with one or other procedure. Pregnancy rate was positively related to the days in milk in the first two AIs. Results were greater in autumn than in spring services.<\/jats:p>","DOI":"10.1111\/rda.13918","type":"journal-article","created":{"date-parts":[[2021,2,23]],"date-time":"2021-02-23T07:13:05Z","timestamp":1614064385000},"page":"783-791","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Probability of pregnancy to artificial insemination either after detected oestrus or at a fixed time in dairy cows: Influence of intrinsic and extrinsic factors in a large\u2010scale, on\u2010farm study"],"prefix":"10.1111","volume":"56","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4685-2105","authenticated-orcid":false,"given":"Rodolfo","family":"Ungerfeld","sequence":"first","affiliation":[{"name":"Departamento de Biociencias Veterinarias Facultad de Veterinaria Universidad de la Rep\u00fablica Montevideo Uruguay"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sergio","family":"Kmaid","sequence":"additional","affiliation":[{"name":"Private Veterinary Practice Montevideo Uruguay"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fernando","family":"Baldi","sequence":"additional","affiliation":[{"name":"Departamento de Zootecnia Faculdade de Ci\u00eancias Agr\u00e1rias e Veterin\u00e1rias (FCAV) Universidade Estadual Paulista Julio de Mesquita Filho (UNESP) Jaboticabal Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Virginia","family":"Salveraglio","sequence":"additional","affiliation":[{"name":"Private Veterinary Practice Montevideo Uruguay"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2021,3,4]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.anireprosci.2019.106147"},{"key":"e_1_2_9_3_1","first-page":"227","article-title":"Reproductive status of dairy herds in Alberta: A closer look","volume":"19","author":"Ambrose D. 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