The majority of cattle are located in tropical areas,
where Bos indicus breeds are predominant, due to their
greater tolerance to high temperatures and humidity, as
well as their resistance to parasitic infections. In Brazil,
the majority of Zebu (Bos indicus) beef cattle are of the
Nelore breed. Despite the adaptability of this subspecies
to heat and nutritional stress, they have a shorter
duration of estrus than Bos taurus cattle, a propensity to
show estrus during the night, and a high incidence of
postpartum anestrous that substantially impairs the
efficiency of protocols that require detection of estrus to
determine the appropriate time for artificial insemination
(AI) [1,2]. Thus, hormonal treatments have been
designed to control both luteal and follicular functions,
providing exciting possibilities for synchronizing estrus
and ovulation and, more importantly, to eliminate estrus
detection to determine timing of AI [3].
The majority of cattle are located in tropical areas,where Bos indicus breeds are predominant, due to theirgreater tolerance to high temperatures and humidity, aswell as their resistance to parasitic infections. In Brazil,the majority of Zebu (Bos indicus) beef cattle are of theNelore breed. Despite the adaptability of this subspeciesto heat and nutritional stress, they have a shorterduration of estrus than Bos taurus cattle, a propensity toshow estrus during the night, and a high incidence ofpostpartum anestrous that substantially impairs theefficiency of protocols that require detection of estrus todetermine the appropriate time for artificial insemination(AI) [1,2]. Thus, hormonal treatments have beendesigned to control both luteal and follicular functions,providing exciting possibilities for synchronizing estrusand ovulation and, more importantly, to eliminate estrusdetection to determine timing of AI [3].
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