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Tuyển tập các báo cáo nghiên cứu về bệnh thú y được đăng trên tạp chí y học General Psychiatry cung cấp cho các bạn kiến thức về ngành thú y đề tài: Causes of Stillbirth and Time of Death in Swedish Holstein Calves Examined Post Mortem. | Acta vet. scand. 2003 44 111-120. Causes of Stillbirth and Time of Death in Swedish Holstein Calves Examined Post Mortem By B. Berglund1 L. Steinbeck1 and M. Elvander2 department of Animal Breeding and Genetics Centre for Reproductive Biology in Uppsala Swedish University of Agricultural Sciences 2National Veterinary Institute Uppsala Sweden. Berglund B Steinbock L Elvander M Causes of stillbirth and time of death in Swedish Holstein calves examined post mortem. Acta vet. scand. 2003 44 111-120. - This study was initiated due to the observation of increasing and rather high levels of stillbirths especially in first-calving Swedish Holstein cows 10.3 2002 . Seventy-six Swedish Holstein calves born to heifers at 41 different farms were post mortem examined in order to investigate possible reasons for stillbirth and at what time in relation to full-term gestation they had occurred. The definition of a stillborn calf was dead at birth or within 24 h after birth after at least 260 days of gestation. Eight calves were considered as having died already in uterus. Slightly less than half of the examined calves 46.1 were classified as having died due to a difficult calving. Four calves 5.3 had different kinds of malformations heart defects enlarged thymus urine bladder defect . Approximately one third of the calves 31.6 were clinically normal at full-term with no signs of malformation and born with no indication of difficulties at parturition or any other reason that could explain the stillbirth. The numbers of male and female calves were rather equally distributed within the groups. A wide variation in post mortem weights was seen in all groups although a number of the calves in the group of clinically normal calves with unexplained reason of death were rather small and compared with e.g. those calves categorised as having died due to a difficult calving their average birth weight was 6 kg lower 39.9 1.7 kg vs. 45.9 1.5 kg p 0.01 . It was concluded that the cause of .
