REPRODUCTIVE RESPONSES TO GRAZING ENDOPHYTE-INFECTED TALL FESCUE BY POSTPARTUM BEEF COWS
作者： J.M. Burke , R.W. Rorie , E.L. Piper , W.G. Jackson
DOI: 10.1016/S0093-691X(01)00569-6
关键词: Biology 、 Grazing 、 Animal science 、 Estrus Detection 、 Agronomy 、 Reproduction 、 Estrous cycle 、 Weaning 、 Pregnancy rate 、 Pregnancy 、 Gestation
摘要: The objective was to determine pregnancy rate and stage of embryonic loss in response grazing endophyte-free (E-; n = 20) or infected (E+; 30) tall fescue postpartum beef cows with calves. Three weeks before estrus synchronization, cow-calf pairs were introduced pastures (April 1999). Cows synchronized bred by AI after detected for a period 6 d then natural service 62 d. Bulls rotated weekly minimize effects toxicosis on male fertility. Fetal development monitored between 30 60 at weaning using transrectal ultrasound. Respiration (52.0 ± 1.4 vs 46.6 breaths/min; P 0.10) occurred environmental temperatures rose above 37.8°C three weeks. Total losses that (between 70 126 gestation) 5.5 (E-) 17.6 (E+) 8.0% (P > 0.10). Pregnancy not different E- E+ under these management conditions.
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