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Largely as a result of the influence of humans in sheep breeding, ewes often produce multiple lambs. This increase in the lamb births, both in number and birth weight, may cause problems in delivery and lamb survival, requiring the intervention of shepherds. 17 days, which last for approximately 30 hours. In addition to emitting a scent, they indicate readiness through physical displays towards rams. During the rut, even normally friendly rams may become aggressive towards humans due to increases in their hormone levels.