000088541 001__ 88541
000088541 005__ 20230914083245.0
000088541 0247_ $$2doi$$a10.1016/j.heliyon.2020.e03529
000088541 0248_ $$2sideral$$a117269
000088541 037__ $$aART-2020-117269
000088541 041__ $$aeng
000088541 100__ $$0(orcid)0000-0003-2827-3054$$aAbecia, José A.$$uUniversidad de Zaragoza
000088541 245__ $$aLight-induced sexually active rams provoke LH preovulatory surges and enhances LH concentrations in ewes after progestagen treatment
000088541 260__ $$c2020
000088541 5060_ $$aAccess copy available to the general public$$fUnrestricted
000088541 5203_ $$aThe effect of the introduction of sexually active rams in spring on LH secretion in ewes after progestagen treatment has been studied. Two rams were induced into a sexually active state by exposure to 2 months of long days (16 h of light/d) from 1 January (SAR), and another 2 rams were exposed to the natural photoperiod, so that they were not sexually activated in spring (control; C). At the end of the long-day period, rams were returned to natural photoperiod conditions. Fifteen ewes synchronized in estrus by intravaginal sponges were assigned to three groups at sponge withdrawal (hour 0): SAR (n = 5), exposed to SAR rams; C (n = 5), exposed to C rams, and ISO (n = 5), kept isolated from rams. Twenty-four hours after pessary removal (hour 0), rams were introduced into the SAR and C groups. Three SAR ewes presented preovulatory LH surges; the proportion was significantly (P < 0.05) higher in this group (3/5) than in the others (C: 0/5, ISO: 0/5). SAR introduction induced a more marked (P < 0.05) increase in mean LH plasma concentrations (before rams: 1.34 ± 0.19; after rams: 6.94 ± 2.66 ng/ml) than C (before: 0.96 ± 0.29; after: 3.60 ± 1.44) or ISO (before: 1.26 ± 0.42; after: 2.14 ± 1.36) groups, and significantly (P < 0.05) higher plasma LH levels after ram introduction. In conclusion, only light-treated sexually activated rams induced LH preovulatory surges in ewes in the seasonal anestrus, when ewes are synchronized with progestagen treatment in the absence of eCG.
000088541 540__ $$9info:eu-repo/semantics/openAccess$$aby-nc-nd$$uhttp://creativecommons.org/licenses/by-nc-nd/3.0/es/
000088541 592__ $$a0.455$$b2020
000088541 593__ $$aMultidisciplinary$$c2020$$dQ1
000088541 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000088541 700__ $$aKeller, Matthieu
000088541 700__ $$aChemineau, Philippe
000088541 700__ $$aDelgadillo, José A.
000088541 7102_ $$12008$$2700$$aUniversidad de Zaragoza$$bDpto. Produc.Animal Cienc.Ali.$$cÁrea Producción Animal
000088541 773__ $$g6, 3 (2020), e03529 1-4$$pHeliyon$$tHeliyon$$x2405-8440
000088541 8564_ $$s610179$$uhttps://zaguan.unizar.es/record/88541/files/texto_completo.pdf$$yVersión publicada
000088541 8564_ $$s47206$$uhttps://zaguan.unizar.es/record/88541/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000088541 909CO $$ooai:zaguan.unizar.es:88541$$particulos$$pdriver
000088541 951__ $$a2023-09-13-10:50:04
000088541 980__ $$aARTICLE