Impacto de doenças reprodutivas e do manejo sobre a produção e reprodução em rebanhos bovinos leiteiros na região de Guaratinguetá / SP.

Abstract

The study aimed to investigate possible causes of the increased calving interval (PI) of 29 dairy cattle in the region of Guaratinguetá-SP from 202-2003 and make an assessment of losses owing to the higher IP, such as lower production milk and reduction of the birth of calves in the properties. We searched for antibodies Bricelose, leptospirosis, infectious bovine rhinotracheitis and bovine viral diarrhea and is frquencias animal herds and positive respectively, 0.87% and 6.89%, 36.87% and 75.86%; 71, 84% and 96.35% and 42.67% and 89.75%. There were differences (P <0.05) in the frequency of positive animals among medical groups rebanhosformados a function of IP, suggesting that the illnesses have contibuindo which index to increase their breeding herds in some showing a significant number of animals with condition lower body. The average calving interval of 14 months found in 29 herds corresponds to an estimated loss of 16.72% or 4,180 liters of milk per day compared to the desired IP in 12 months, representing R $ 839,135.00 gross at the end of one year, considering the price of $ 0.55 per liter received by the producer. Added to these losses the 499 bezzeros who are born annually in the properties