000119740 001__ 119740
000119740 005__ 20240319081024.0
000119740 0247_ $$2doi$$a10.1016/j.theriogenology.2022.08.035
000119740 0248_ $$2sideral$$a130574
000119740 037__ $$aART-2022-130574
000119740 041__ $$aeng
000119740 100__ $$0(orcid)0000-0003-2827-3054$$aAbecia, José Alfonso$$uUniversidad de Zaragoza
000119740 245__ $$aExposure of rams in sexual rest to sexually activated males in spring increases plasma LH and testosterone concentrations
000119740 260__ $$c2022
000119740 5060_ $$aAccess copy available to the general public$$fUnrestricted
000119740 5203_ $$aEight stimulating rams, and twelve stimulated rams, were used to determine whether a similar endocrine response to the introduction of sexually active males in spring in a flock of ewes is observed in a flock of rams. The stimulating rams (n = 4) were induced into a sexually active state by exposure to 2 months of long days (16 h light/d) (15 December-15 February). At the end of the long-day period, rams were returned to the natural photoperiod. Control-stimulating rams (n = 4) were kept under the natural photoperiod. On April 20, stimulated rams were divided into 2 groups, and joined with activated (ACT; n = 6) or control stimulating rams (C; n = 6). On the day of ram introduction, stimulated rams were blood sampled for 8 h at 20-min intervals, from 4 h before to 4 h after ram introduction, and next day from 24 to 28 h after ram introduction, and analyzed for plasma LH concentrations, and 10, 20 and 30 days after ram introduction to measure plasma testosterone levels. Mean (±SEM) plasma LH concentrations (ng/ml) of stimulated rams were similar during the 4 h before stimulating-ram introduction (ACT: 0.59 ± 0.03; C: 0.53 ± 0.04; P > 0.05). The introduction of the photoperiod-treated stimulating rams increased LH concentrations of stimulated rams during the 4 h after their introduction (1.14 ± 0.37) compared with the C group (0.51 ± 0.03; P < 0.05), especially during the first hour (ACT: 0.93 ± 0.16; C: 0.49 ± 0.03; P < 0.05), and during the blood sampling period 24–28 h after ram introduction (0.75 ± 0.07 vs. 0.58 ± 0.04; P < 0.05). Before the introduction of stimulating rams, the LH pulse frequencies and amplitudes did not differ between groups; however, LH pulsatility was higher at 4 h (0.58 ± 0.11 pulses/h; P < 0.05), and had trend to be higher 24 h (0.50 ± 0.06) (P = 0.10) after the introduction of the photoperiod-treated stimulating rams compared with the control-stimulating rams (0.29 ± 0.08 and 0.29 ± 0.10, respectively). As for LH pulses, there was an effect of group (P < 0.05) on LH amplitude, which presented a trend to be higher in ACT rams 4 h after ram introduction (1.68 ± 0.30; P < 0.10) and higher 24 h (1.07 ± 0.08; P < 0.05) after ram introduction, compared with LH amplitudes of C rams (0.71 ± 0.06 and 0.82 ± 0.07, respectively). Plasma testosterone concentrations of rams exposed to photoperiod-treated activated rams were higher than those of rams exposed to control-stimulating rams, at 4 h, 20 and 30 days after ram introduction (P < 0.05). In conclusion, sexually active rams in spring are able to stimulate LH and testosterone secretion of other rams in sexual rest, a phenomenon we called “ram-to-ram effect".
000119740 540__ $$9info:eu-repo/semantics/openAccess$$aby$$uhttp://creativecommons.org/licenses/by/3.0/es/
000119740 590__ $$a2.8$$b2022
000119740 592__ $$a0.764$$b2022
000119740 591__ $$aVETERINARY SCIENCES$$b17 / 144 = 0.118$$c2022$$dQ1$$eT1
000119740 593__ $$aAnimal Science and Zoology$$c2022$$dQ1
000119740 591__ $$aREPRODUCTIVE BIOLOGY$$b19 / 31 = 0.613$$c2022$$dQ3$$eT2
000119740 593__ $$aSmall Animals$$c2022$$dQ1
000119740 593__ $$aFood Animals$$c2022$$dQ1
000119740 593__ $$aEquine$$c2022$$dQ1
000119740 594__ $$a5.6$$b2022
000119740 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000119740 700__ $$aCanto, Francisco
000119740 700__ $$aKeller, Matthieu
000119740 700__ $$aPalacios, Carlos
000119740 700__ $$aChemineau, Philippe
000119740 700__ $$aDelgadillo, José Alberto
000119740 7102_ $$12008$$2700$$aUniversidad de Zaragoza$$bDpto. Produc.Animal Cienc.Ali.$$cÁrea Producción Animal
000119740 773__ $$g192 (2022), 116-121$$p1879-3231]$$tTHERIOGENOLOGY$$x0093-691X
000119740 8564_ $$s1023291$$uhttps://zaguan.unizar.es/record/119740/files/texto_completo.pdf$$yVersión publicada
000119740 8564_ $$s2514540$$uhttps://zaguan.unizar.es/record/119740/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000119740 909CO $$ooai:zaguan.unizar.es:119740$$particulos$$pdriver
000119740 951__ $$a2024-03-18-16:34:58
000119740 980__ $$aARTICLE