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Study 1, <jats:italic>Bos indicus<\/jats:italic> cows were distributed (three groups). The control group (CG) was subjected: on day zero (d0), the animals received a CIDR and oestradiol benzoate (EB); on (d8, CIDR was removed, and PGF2\u03b1 and oestradiol cypionate (EC) were administered; on d10, timed Artificial Insemination (TAI) was performed; on d45, pregnancy diagnosis was made. The rbST on d0 group (bST0G) was subjected to an identical protocol as CG, except for the addition of 250\u2009mg rbST on d0. The rbST on d8 group (bST8G) was subjected to the same protocol as bST0G, except that the rbST was administered on d8 rather. In study 2, the animals followed the same design which was used in <jats:italic>Bos taurus<\/jats:italic> cows. The follicular growth rate (FGR) was calculated between d8 and d10. In study 1, pregnancy\/artificial insemination (P\/AI) did not differ among the treatments. FGR in bST8G was higher than in other groups. In study 2, bST0G showed higher Pregnancy\/Artificial Insemination (P\/AI) (<jats:italic>p<\/jats:italic>\u2009&lt;\u2009.05) when compared with other groups. bST0G showed a different FGR (<jats:italic>p<\/jats:italic>\u2009&lt;\u2009.0001) than the other groups. In conclusion, rbST (<jats:italic>Bos indicus<\/jats:italic> cows) did not increase P\/AI, but it did promote follicular growth when administered on d8; the rbST administered on d0 improved P\/AI (<jats:italic>p<\/jats:italic>\u2009&lt;\u2009.05) and the FGR in <jats:italic>Bos taurus<\/jats:italic> cows.<\/jats:p>","DOI":"10.1111\/rda.14479","type":"journal-article","created":{"date-parts":[[2023,11,6]],"date-time":"2023-11-06T05:22:54Z","timestamp":1699248174000},"page":"1654-1661","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Effect of recombinant bovine somatotropin on the reproductive efficiency of beef cows subjected to differently timed\u2010artificial insemination protocols"],"prefix":"10.1111","volume":"58","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1253-6905","authenticated-orcid":false,"given":"Grassiele","family":"Gasseferth","sequence":"first","affiliation":[{"name":"Graduate Program in Animal Science Pontif\u00edcia Universidade Cat\u00f3lica do Paran\u00e1  Curitiba Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9190-603X","authenticated-orcid":false,"given":"Francisco Romano","family":"Gaievski","sequence":"additional","affiliation":[{"name":"Centro de Tecnologia em Reprodu\u00e7\u00e3o e Gen\u00e9tica  Francisco Beltr\u00e3o Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4027-9109","authenticated-orcid":false,"given":"T\u00e1cia Gomes","family":"Bergstein\u2010Galan","sequence":"additional","affiliation":[{"name":"Positivo University  Curitiba Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4279-6388","authenticated-orcid":false,"given":"Adalberto Gassenferth","family":"J\u00fanior","sequence":"additional","affiliation":[{"name":"Santa Catarina South University  Curitiba Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3901-4146","authenticated-orcid":false,"given":"Angelo","family":"Bragato","sequence":"additional","affiliation":[{"name":"Assist\u00eancia T\u00e9cnica Veterin\u00e1ria  Chopinzinho Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5546-5604","authenticated-orcid":false,"given":"Vitor Mohad","family":"Valle","sequence":"additional","affiliation":[{"name":"Graduate Program in Animal Science Pontif\u00edcia Universidade Cat\u00f3lica do Paran\u00e1  Curitiba Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4984-0612","authenticated-orcid":false,"given":"Gabriela Volf Andrade","family":"Rosa","sequence":"additional","affiliation":[{"name":"Vet Max Assist\u00eancia T\u00e9cnica Veterin\u00e1ria  Curitiba Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9474-9404","authenticated-orcid":false,"given":"Fernando Andrade","family":"Souza","sequence":"additional","affiliation":[{"name":"Curso de Medicina veterin\u00e1ria, Setor de Ciencias Agr\u00e1rias Universidade Federal do Paran\u00e1  Curitiba Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0002-4801-4666","authenticated-orcid":false,"given":"Marina","family":"de Pauli\u00a0Thomaz","sequence":"additional","affiliation":[{"name":"Graduate Program in Animal Science Pontif\u00edcia Universidade Cat\u00f3lica do Paran\u00e1  Curitiba Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0548-701X","authenticated-orcid":false,"given":"Luiz Ernandes","family":"Kozicki","sequence":"additional","affiliation":[{"name":"Graduate Program in Animal Science Pontif\u00edcia Universidade Cat\u00f3lica do Paran\u00e1  Curitiba Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2023,11,5]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.theriogenology.2017.08.024"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.2527\/2000.7851291x"},{"key":"e_1_2_9_4_1","first-page":"403","article-title":"Interactions between nutrition and ovarian activity in cattle: Physiological, cellular and molecular mechanisms","volume":"61","author":"Armstrong D. 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