EFEITO DO FOTOPERÍODO CICLICIDADE DE ÉGUA NO AGRESTE PARAIBANO

Abstract

In order to determine which is the reproductive period of mares in the Paraíba arid region, there was a study during the 12-month period (July 2013 to June 2014), in the municipalities of properties Gurinhém, Inga, Boqueirao, Campina Grande, Caturité and Remigio, all located in the state of Paraíba. 93 mares were used with age ranging between 24 and 264 months, kept in paddocks consist of grass Buffel Grass (Cenchrus riparian), Orocloa (Orocloamosambicensis), Tanzania (PanicummaximumJacq) and mineral mixture. The evaluation was performed by transrectal ultrasonography every 15 days until reaching the mares diameter of 23 mm on one or more follicles. From that moment, the mares were monitored every 48 hours until the follicle reaches 35mm in diameter. After this diameter, the mares were monitored daily until ovulation. Data from this observation were related to photoperiod data in the region. It was observed that among the months from June to August, the mares have a high rate of anoestrus, the lowest photoperiod than twelve hours / light / day. Thus, it is concluded that the mares of the Agreste region have seasonality, focusing anestrus period between June and August.