title: The detection of estrus in cattle raised under tropical conditions: what we know and what we need to know.
abstract: Lack of accuracy in estrus detection in cattle is a major constraint affecting the implementation of techniques such as artificial insemination (AI) and embryo transfer (ET). For this reason clinicians have opted to pharmacologically manipulate the estrus cycle. The advantages and shortcomings of using this approach to improve the implementation of AI and ET are discussed in this review. Moreover, in order to highlight the reasons why estrus detection is difficult in cows kept at grazing in the tropics, this review underlines social and behavioral traits hindering the capacity of the casual observer to accurately identify cows in estrus.
authors.affiliation: Departamento de Reproducción, Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Autónoma de México, 04510 México. cgalina@servidor.unam.mx
authors.forename: Carlos S
authors.initials: CS
authors.lastname: Galina
authors.forename: Agustín
authors.initials: A
authors.lastname: Orihuela
mesh_terms: D000818:Animals; D002417:Cattle / Q000502:physiology*; D004971:Estrus / Q000502:physiology*; D005260:Female; D012739:Gonadal Steroid Hormones / Q000502:physiology; D008297:Male; D006080:Ovarian Follicle / Q000502:physiology; D014329:Tropical Climate
chemical_list: D012739:Gonadal Steroid Hormones