he use of a defined breeding season (BS) is a common
reproductive management strategy in beef cattle. This
approach is used to facilitate calving and calf management,
and to allow calving and breeding during optimal climatic
conditions and forage availability. In tropical countries, it is
common to breed during the spring and summer months
(October to February) when there is higher availability of
forage. Consequently, calving occurs in the spring (August
to December) when it is drier, which results in lower
parasite and infectious disease challenges for calves.