Relationships between endometrial cytology and interval to first ovulation,and pregnancy in postpartum dairy cows in a single herd |
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| Institution: | 1. Dairy Research and Technology Centre, Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta, Canada T6G 2P5;2. Dairy Research and Technology Centre, Agriculture Research Division, Alberta Agriculture and Rural Development, Edmonton, Alberta, Canada T6H 5T6;1. Department of Dermatology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania;2. Corporal Michael J. Crescenz Veterans Administration Medical Center, Philadelphia, Pennsylvania;1. Division of High Risk Pregnancy, Department of Obstetrics and Gynecology, Mackay Memorial Hospital, Taipei, Taiwan;2. Mackay Junior College of Medicine, Nursing, and Management, Taipei, Taiwan;3. Department of Medicine, Mackay Medical College, Taipei, Taiwan;1. Institute of Life Science, Swansea University Medical School, Singleton Park, Swansea SA2 8PP, United Kingdom;2. Faculty of Agricultural and Veterinary Science, Universidade Estadual Paulista, Jaboticabal, Brazil;2. Centre for Genetic Improvement of Livestock, University of Guelph, Guelph, Ontario, Canada, N1G 2W1 |
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| Abstract: | The objectives were to investigate the relationships between endometrial cytology (EC) and interval from calving to first ovulation, and pregnancy in dairy cows, and that between uterine fluid and EC. On day 25 postpartum, 39 dairy cows were grouped based on EC, as having low (⩽8%) or high (>8%) polymorphonuclear cells (PMN), and the quantity of uterine fluid was assessed by ultrasound. The interval from calving to first ovulation was shorter in low, than in high PMN cows (32 vs. 45 d). A greater proportion of cows with uterine fluid had high PMN (64% vs. 21%), and the PMN increased from 14% to 34% as the quantity of uterine fluid increased. The mean interval from calving to ovulation was longer in primiparous cows with high PMN (49 d) compared to that of primiparous and multiparous cows with low PMN (28 and 29 d, respectively). Although the conception rate to first service at 92 d postpartum was not different between PMN groups, the cumulative pregnancy at 270 d tended to be higher in low than in high PMN (80% vs. 58%) multiparous cows. Also, cows that had uterine fluid on day 25 postpartum had a shorter interval from calving to pregnancy than those with no uterine fluid (161 vs. 208 d). In conclusion, combining transrectal ultrasonography with endometrial cytology on day 25 postpartum has diagnostic value in the assessment of uterine inflammation. |
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