Objective of the present study was to develop an experimental model that could be used for the study
of pregnancy toxaemia in ewes. The study included 28 ewes, which initially had received effective
anthelmintic treatment and, then, received a mixture of trichostrongylid infective larvae. Until the 60th
day of pregnancy, per ewe daily ration was 1.30 kg of a concentrate feed (net energy: 0.844 FUL) plus
2.50 kg of alfalfa hay. From the 60th to 100th day of pregnancy, per ewe daily ration was 0.60 kg of the
same concentrate plus 2.00 kg of hay. From the 100th day of pregnancy, per ewe daily ration was 0.50 kg
of a reduced energy concentrate feed (net energy: 0.748 FUL) plus 0.50 kg of alfalfa hay for ewes with
one foetus; during that period, respective figures for ewes with two foetuses were 0.60 kg and 0.50 kg
and for ewes with three foetuses were 0.80 kg and 0.50 kg. In total, 16 ewes developed increased -hydroxybutyrate blood concentrations, characteristic of pregnancy toxaemia. There was a significant
reverse correlation (P = 0.016) between blood -hydroxybutyrate concentrations and lamb birth bodyweight. Ewes with pregnancy toxaemia had greater faecal epg counts than ewes with no pregnancy
toxaemia (P < 0.025); there was also a significant reverse correlation between faecal epg counts and
lamb birth bodyweight (P = 0.03) and a significant correlation between blood -hydroxybutyrate concentrations and faecal epg counts (P < 0.001). Ewes with pregnancy toxaemia also had smaller blood
concentrations of glucose than ewes with no pregnancy toxaemia (P = 0.033). In conclusion, administration of a concentrate feed with reduced energy content during the last stage of pregnancy induced
pregnancy toxaemia in ewes, at the same time covering satiation requirements of the animals and thus
maintaining welfare standards. Parasitism might have further contributed to improving the efficacy of
the model.
Objective of the present study was to develop an experimental model that could be used for the studyof pregnancy toxaemia in ewes. The study included 28 ewes, which initially had received effectiveanthelmintic treatment and, then, received a mixture of trichostrongylid infective larvae. Until the 60thday of pregnancy, per ewe daily ration was 1.30 kg of a concentrate feed (net energy: 0.844 FUL) plus2.50 kg of alfalfa hay. From the 60th to 100th day of pregnancy, per ewe daily ration was 0.60 kg of thesame concentrate plus 2.00 kg of hay. From the 100th day of pregnancy, per ewe daily ration was 0.50 kgof a reduced energy concentrate feed (net energy: 0.748 FUL) plus 0.50 kg of alfalfa hay for ewes withone foetus; during that period, respective figures for ewes with two foetuses were 0.60 kg and 0.50 kgand for ewes with three foetuses were 0.80 kg and 0.50 kg. In total, 16 ewes developed increased -hydroxybutyrate blood concentrations, characteristic of pregnancy toxaemia. There was a significantreverse correlation (P = 0.016) between blood -hydroxybutyrate concentrations and lamb birth bodyweight. Ewes with pregnancy toxaemia had greater faecal epg counts than ewes with no pregnancytoxaemia (P < 0.025); there was also a significant reverse correlation between faecal epg counts andlamb birth bodyweight (P = 0.03) and a significant correlation between blood -hydroxybutyrate concentrations and faecal epg counts (P < 0.001). Ewes with pregnancy toxaemia also had smaller bloodความเข้มข้นของกลูโคสมากกว่า ewes กับ toxaemia ไม่ตั้งครรภ์ (P = 0.033) เบียดเบียน เลี้ยงบริหารแบบเข้มข้น ด้วยเนื้อหาพลังงานลดลงในระหว่างขั้นตอนสุดท้ายของการตั้งครรภ์ที่เกิดจากตั้งครรภ์ toxaemia ใน ewes ในเวลาเดียวกันที่ครอบคลุมข้อกำหนด satiation ของสัตว์จึงรักษามาตรฐานสวัสดิการ Parasitism อาจมีเพิ่มเติมส่วนการปรับปรุงประสิทธิภาพของรูปแบบการ
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