Assessment of ergot (Claviceps purpurea) exposure in pregnant and postpartum beef cows

摘要

Cows were fed ration for 9 wk containing 5, 48, 201, and 822 mu g kg(-1) ergot alkaloids. The objective was to evaluate the impact of ergot consumption in beef cow-calf operations. Ergot alkaloids up to 822 mu g kg(-1) did not alter the weight of peripartum and postpartum beef cows (P = 0.93) or nursing calves (P = 0.08), rectal temperature (P = 0.16), or plasma prolactin concentrations (P = 0.30) at moderate ambient temperatures. Ergot did not influence the time (&1 ng mL(-1); P = 0.79) or the progesterone concentration (P = 0.38) at the time of first postpartum rise or the size of the first (14 +/- 0.6 mm; P = 0.40) and second (13 +/- 0.5 mm; P = 0.41) follicles to ovulate. The maximum size of the first postpartum corpus luteum (CL) was 4 mm larger in the 822 mu g kg(-1) ergot group compared with the control (P = 0.03) for the first ovulation post partum, but not for the second (P = 0.11). There was no effect of ergot exposure on the number of days until the appearance of the first (43 +/- 4 d; P = 0.95) or second (52 +/- 4 d; P = 0.98) CL post partum. Ergot alkaloid concentrations up to 822 mu g kg(-1) did not affect pregnancy rates (X-2 = 0.36). In conclusion, ergot alkaloid exposure for 9 wk to concentrations as high as 822 mu g kg(-1) did not alter performance in pregnant and postpartum beef cattle at moderate ambient temperatures.