{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,13]],"date-time":"2026-02-13T14:14:02Z","timestamp":1770992042677,"version":"3.50.1"},"reference-count":39,"publisher":"Oxford University Press (OUP)","issue":"9","license":[{"start":{"date-parts":[[2020,9,9]],"date-time":"2020-09-09T00:00:00Z","timestamp":1599609600000},"content-version":"vor","delay-in-days":8,"URL":"https:\/\/academic.oup.com\/journals\/pages\/open_access\/funder_policies\/chorus\/standard_publication_model"}],"funder":[{"DOI":"10.13039\/100005825","name":"National Institute of Food and Agriculture","doi-asserted-by":"publisher","award":["2018-67015-27612"],"award-info":[{"award-number":["2018-67015-27612"]}],"id":[{"id":"10.13039\/100005825","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100007015","name":"University of Wisconsin-Madison","doi-asserted-by":"publisher","award":["WIS01932"],"award-info":[{"award-number":["WIS01932"]}],"id":[{"id":"10.13039\/100007015","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2020,9,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>Bovine twin birth is associated with detriments, including increased embryo\/fetal losses, malpresentation, and dystocia. Incidence of these is lessened in bilateral compared with unilateral twin pregnancy. This study was undertaken to assess the use of follicular ablation by aspiration to create bilateral twin pregnancies in females with genetic potential for ~3.5 ovulations per cycle (Trio allele carriers). In experiment 1, carriers (n = 30) and noncarriers (n = 10) were synchronized for ovulation and timed artificial insemination (TAI). Follicles (&amp;gt;5 mm) in excess of one per ovary were aspirated ~16 h preceding TAI. Follicle count for females with follicles on only one ovary was reduced to two. Blood was sampled 2 wk post-TAI to assess progesterone (P4) concentrations; embryo count was determined by ultrasound 6 wk post-TAI. Circulating P4 concentration post-TAI was significantly (P &amp;lt; 0.001) associated with both genotype and subsequent pregnancy status (pregnant noncarriers: 7.06 \u00b1 0.68 ng\/mL; pregnant carriers: 5.54 \u00b1 0.55 ng\/mL; nonpregnant noncarriers: 5.22 \u00b1 1.05 ng\/mL; nonpregnant carriers: 3.13 \u00b1 0.42 ng\/mL). Experiment 2 was undertaken to offset the negative effects of follicular aspiration on subsequent P4 concentration observed in experiment 1. Carriers (n = 38) and noncarriers (n = 32) were submitted to TAI and follicle ablation as described for experiment 1. Additionally, accessory corpora lutea (CL) were induced in carriers by the administration of human chorionic gonadotropin (carriers) at day 6 post-TAI. Consequently, P4 concentration post-TAI was significantly (P &amp;lt; 0.05) associated with subsequent pregnancy status (pregnant: 8.48 \u00b1 0.61 ng\/mL; nonpregnant: 6.70 \u00b1 0.63 ng\/mL) but not with genotype (carrier: 8.01 \u00b1 0.59 ng\/mL; noncarrier: 7.17 \u00b1 0.64 ng\/mL). Embryo number was greater in carriers (exp. 1: 1.64 \u00b1 0.81; exp 2: 1.45 \u00b1 0.09) vs. noncarriers (1.00 \u00b1 0.00, both experiments). Single, twin, and triplet pregnancies occurred in carriers in experiment 1, whereas multiples in experiment 2 were limited to twin pregnancies. Genotype effects on pregnancy rate were not significant (P &amp;gt; 0.10) in either experiment. Results suggest that follicular ablation to create bilateral twin pregnancies in Trio carriers is feasible but requires the induction of accessory CL to offset the negative effects of follicular aspiration on subsequent P4 concentration and associated fertility outcomes.<\/jats:p>","DOI":"10.1093\/jas\/skaa292","type":"journal-article","created":{"date-parts":[[2020,9,9]],"date-time":"2020-09-09T01:43:59Z","timestamp":1599615839000},"source":"Crossref","is-referenced-by-count":3,"title":["Practical application of an impractical bovine genotype: creating bilateral twin pregnancies in Trio allele carriers"],"prefix":"10.1093","volume":"98","author":[{"given":"Guilherme","family":"Madureira","sequence":"first","affiliation":[{"name":"Department of Animal and Dairy Sciences, University of Wisconsin-Madison, Madison, WI"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Victor","family":"Gomez-Le\u00f3n","sequence":"additional","affiliation":[{"name":"Department of Animal and Dairy Sciences, University of Wisconsin-Madison, Madison, WI"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Gustavo Fernandes","family":"Grillo","sequence":"additional","affiliation":[{"name":"Department of Animal and Dairy Sciences, University of Wisconsin-Madison, Madison, WI"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jo\u00e3o Paulo","family":"Nascimento Andrade","sequence":"additional","affiliation":[{"name":"Department of Animal and Dairy Sciences, University of Wisconsin-Madison, Madison, WI"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Beth","family":"Lett","sequence":"additional","affiliation":[{"name":"Department of Animal and Dairy Sciences, University of Wisconsin-Madison, Madison, WI"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sadrollah Molaei","family":"Moghbeli","sequence":"additional","affiliation":[{"name":"Department of Animal and Dairy Sciences, University of Wisconsin-Madison, Madison, WI"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Milo C","family":"Wiltbank","sequence":"additional","affiliation":[{"name":"Department of Animal and Dairy Sciences, University of Wisconsin-Madison, Madison, WI"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2962-3861","authenticated-orcid":false,"given":"Brian W","family":"Kirkpatrick","sequence":"additional","affiliation":[{"name":"Department of Animal and Dairy Sciences, University of Wisconsin-Madison, Madison, WI"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"286","published-online":{"date-parts":[[2020,9,9]]},"reference":[{"key":"2021090900024950800_CIT0001","doi-asserted-by":"crossref","first-page":"485","DOI":"10.2527\/jas1982.543485x","article-title":"Induction of twins in different breeds of cattle","volume":"54","author":"Anderson","year":"1982","journal-title":"J. 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