糖甜菜定域育种初步研究

试验结果表明，甜菜单粒种采种母根主、侧花枝种子的块根产量、含糖率不同。单粒种根头周边芽所形成的花枝种子比根头中央部芽的花枝种子所产生的块根含糖率高0．79-2．45度，表现趋势较一致；但主、侧花枝种子的块根产量高低表现趋势不一致。为提高含糖率，此方法可在甜菜单粒型品系育种中应用。     

毛乌素沙区杨柴林,沙柳林沙地水文常数的研究

本文针对毛乌素沙地中广泛分布的两个人工林－－杨柴林和沙柳林，通过采用土壤物理分析测定法，研究了其沙地的颗料组成状况和水文常数。结果表明：受颗粒组成状史的影响，杨柴林沙地的最大吸湿量为：上层（０￣１５０ｃｍ深）０．７７６％，下层（１５０￣２００ｃｍ深）１．５０４％，田间持水量为３．４１２￣４．３８１％，凋萎湿度为０．７８１％（植物为杨柴）；沙柳林沙地迎风坡、丘顶和背风坡的最大吸湿量为：上层０．７９６     

Comparison of Surgical and Medical Treatment of 49 Postpartum Mares with Presumptive or Confirmed Uterine Tears

Objective— To determine outcome after medical or surgical treatment of postpartum mares with confirmed or presumptive uterine tears. Study Design— Case series. Methods— Postpartum mares were included if foaling had occurred within 7 days and uterine tear was confirmed surgically or, in medically treated mares, by palpation or presumed based on peritonitis. Information (age, breed; physical examination, laboratory and abdominocentesis findings; treatment, survival rates, length of hospital stay, treatments costs, and breeding performance after discharge) was obtained from the medical records (1990–2007). The influence of variables was compared between medical and surgical treatment, and between survivors and nonsurvivors. Results— For 49 mares, survival was 75%, with no significant difference between medical (11/15; 73%) or surgical (26/34; 76%) treatment. Admission variables, treatment cost, duration of hospital stay, and likelihood of foaling after discharge were not significantly different between treatment groups. Nonsurvivors were significantly more likely to have gastric reflux, higher heart rate, anion gap, lower total CO₂, and leukocyte count, compared with survivors. Tears were significantly (P=.018) more likely to occur in the right uterine horn than in other parts of the uterus. Conclusions— Uterine tears occur more commonly in the uterine horns, more so the right horn, and survival is similar with surgical or medical treatment of uterine tears in postpartum mares. Clinical Relevance— Medical treatment may be a reasonable alternative to surgical treatment for uterine tears, although the severity of tear that can resolve with medical treatment is unknown, and medical therapy can be as expensive as surgical treatment.     

Acute myelogenous leukaemia in a mare

SUMMARY: A 5-year-old Thoroughbred mare presented with a 4 week history of weight loss, fever and leukopenia. Rectally, a large active foetus, thickened spleen and an abdominal mass were palpated. Leukopenia, mild anaemia, marked thrombocytopenia and hyperfibrinogenaemia were found. Cytology and cytochemical staining of a bone marrow aspirate supported a diagnosis of acute myelogenous leukaemia. The mare deteriorated despite medical therapy and was humanely euthanased.