A doe in heat typically flags (vigorously wags) her tail often, stays near the buck if one is present, becomes more vocal, and may also show a decrease in appetite and milk production for the duration of the heat.
Bucks (intact males) of Swiss and northern breeds come into rut in the fall as with the does' heat cycles.
Each recognized breed of goats has specific weight ranges, which vary from over 140 kg (300 lb) for bucks of larger breeds such as the Boer, to 20 to 27 kg (45 to 60 lb) for smaller goat does.
Successful breeding in these regions depends more on available forage than on day length.
Does of any breed or region come into estrus (heat) every 21 days for two to 48 hours.
Bucks of equatorial breeds may show seasonal reduced fertility, but as with the does, are capable of breeding at all times.
Rut is characterized by a decrease in appetite and obsessive interest in the does.
Latin haedus "kid"), To refer to the male, Old English used bucca (giving modern buck) until ousted by hegote, hegoote in the late 12th century.