Postpartum Ovarian Function of Dairy Cows in a Tropical Environment

摘要: Abstract Intervals from parturition to first estrus and the three ovulations were studied in 25 Holstein 31 Jamaica Hope cows Jamaica. Casual observations for signs of supplemented by twice nightly observation periods. Samples blood plasma obtained weekly all assayed progesterone. The progesterone profile each cow was used determine when occurred. standard deviations first, second, third 19.8±8.8, 39.4±9.0, 58.6±9.2 days Holsteins, which shorter than same intervals (28.7±15.6, 46.9±13.6, 66.3±12.6 days). detected 46.0±21.4 Holsteins 45.5±18.7 Hopes. There no significant differences between seasons calving or estrus. Percentages at 19, 61.9, 57.8% 43.3, 55.2, 73.1% kept a tropical environment are capable returning cycling, rebreedable state showing detectable as soon after can be expected reasonably.