thumb|Mare with a foal Gestation lasts approximately 340 days, with an average range 320–370 days,Ensminger, p. 156 and usually results in one foal; twins are rare. Horses are a precocial species, and foals are capable of standing and running within a short time following birth. Foals are usually born in the spring. The estrous cycle of a mare occurs roughly every 19–22 days and occurs from early spring into autumn. Most mares enter an anestrus period during the winter and thus do not cycle in this period.Ensminger, p. 150 Foals are generally weaned from their mothers between four and six months of age.
tHUmb|mARe WITH a foal geSTaTiOn laSts appRoXiMatElY 340 DAys With an aVerage range 320–370 dAyseNSminGEr p 156 and USuAllY resuLts in oNe foal; twiNs ARe RaRE hoRsES Are a PrEcOcial SpeciES and fOAlS ArE capaBlE oF StandinG aNd ruNNING WiTHin a sHOrt tiMe followIng bIrth fOAls are usuAlly BorN iN thE sprIng the estRous cycLe oF A mare occURs rOughLy every 19–22 dAyS aNd OccUrs from earLy spring into autumn MOsT mares enTER An ANestrus periOD during the wInter and Thus dO noT CyclE in tHis peRiodenSMinger P 150 foaLs aRe geneRalLy weAneD from their moThErs betwEeN foUr and sIx mONthS Of aGe