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dc.contributor.authorDe Rensis, F.
dc.contributor.authorMorini, Giorgio
dc.contributor.authorGarcía Ispierto, Irina
dc.contributor.authorLópez Gatius, Fernando
dc.description.abstractWhile cows are predominantly monovular, over the past 30 years the incidence of multiple ovulations and thus twinning has increased considerably alongside milk production. Multiple pregnancies are not desirable as they negatively affect the health of cows and the herd economy. Although causal mechanisms associated with multiple ovulations have been extensively revised, the process of multiple ovulations is not well understood. Recent studies on the thermal biology of the reproductive system have shown how thermal mechanisms may prevent or favor multiple ovulations. This review focuses on this relationship between thermal dynamics and multiple pregnancies. Cooling of the pre-ovulatory follicle is able to regulate ovulation. In effect, pre-ovulatory local cooling of the female reproductive system favors male and female gamete maturation and promotes fertilization. Thermal stress is proposed here as a model of stress. Periods of high ambient temperature affect the processes of pre-ovulatory follicular cooling and multiple ovulations. While the ratio between unilateral and bilateral multiple pregnancies is normally close to one, under heat stress conditions, this ratio may be 1.4 favoring unilateral multiple pregnancies. A ratio approaching unity is here proposed as an indicator of cow wellbeing.ca_ES
dc.description.sponsorshipThis research was funded by “Fondo Locale per la Ricerca-FIL 2020/2021” University of Parma, Italy (coordinator F.D.R.).ca_ES
dc.relation.isformatofReproducció del document publicat a:
dc.relation.ispartofAnimals, 2021, vol. 11, núm. 2, p. 435ca_ES
dc.rightscc-by (c) De Rensis et al., 2021ca_ES
dc.subjectGraafian follicleca_ES
dc.subjectOvarian physiologyca_ES
dc.subjectOvulation failureca_ES
dc.subjectUnilateral ovulationsca_ES
dc.titleThermal Mechanisms Preventing or Favoring Multiple Ovulations in Dairy Cattleca_ES

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cc-by (c) De Rensis et al., 2021
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