Uterine Activity after Induction of Hypocalcaemia in the Ovariectomized Camel (Camelus Dromedarius)

Al-Eknah, M.M., Homeida, A.M., Dafalla, E.A., Galil, A.K.A. and Al-Tahir, A.Y., 1997. Uterine activity after induction of hypocalcaemia in the ovariectomized camel (Camelus dromedarius). Veterinary Research Communications, 21 (1), 45-50.Bilateral ovariectomy was performed in three parous, non-pregnant camels. Intrauterine and intra-abdominal pressure changes were recorded using balloon-tipped catheters. Uterine contractions were induced and maintained in the ovariectomized camels by daily intramuscular injections of 5 mg oestradiol benzoate throughout the experimental period. The frequency of uterine contractions varied from 6 to 9 per minute, whereas the amplitude varied from 2 to 3 kPa in all the animals. Inducing hypocalcaemia to a level of 0.5 mmol/L by Na2EDTA reduced the amplitude of the contractions to below 1 kPa (p<0.001). The frequency of the contractions was not affected.     

断翅对肉用仔鸡生产性能影响的试验

肉用雏鸡断翅饲养试验表明：8周龄末，试验组鸡的个体均重比对照组多50．7g；断翅与否对鸡的成活率没有影响；试验组料重比2．06：1，对照组为2．63：1，每增重1kg活体，少消耗饲料O．57kg；屠宰后，胸肌与腿肌占屠体比例，试验组比对照组分别高1．3％与1．9％；胸肌与腿肌的重量，试验组比对照组高13．2％与14．9％。只鸡盈利试验组为1．46元，对照组0．43元。     

我国农村资金外流分析

在中国，“二元经济结构”导致资本发生流动偏好，资本流动偏好又加快农村资金外流的规模与速度。因此，减缓叶：国农村资金外流必须依据资本流动偏好规律，改善农村投资环境，完善农村各种金融机构职能。从而改变资金流动方向，引导资金向农村回流。     

Plasma enteroglucagon and neurotensin levels in gnotobiotic calves infected with enteropathogenic and non-enteropathogenic viruses

Five gnotobiotic calves were each infected with five viruses. Each calf was inoculated with coronavirus at seven days old, followed by astrovirus, Newbury agent, parainfluenzavirus type 3 and rotavirus at intervals of two weeks. Three of the viruses were enteropathogenic (bovine coronavirus, bovine calici-like virus and bovine rotavirus) and two were not (bovine astrovirus and parainfluenzavirus type 3). Plasma levels of the peptide hormones enteroglucagon and neurotensin and faecal output were measured daily and xylose absorption was studied before and after each infection. A close correlation was found between a rise in plasma enteroglucagon and neurotensin and infection with enteropathogenic viruses. The three enteropathogenic viruses caused increased daily faecal output, and elevated plasma levels of enteroglucagon and neurotensin, while the non-enteropathogens did not. The calici-like virus and rotavirus but not the coronavirus caused xylose malabsorption.     

板栗良种基地营建技术研究

在江苏省溧阳市龙潭林场，进行了板优良品种的收集，良种优良，良种繁育，板栗嫩枝扦插等一系列营建技术研究，取得了明显的经济，社会效益。     

An enzyme-linked immunosorbent assay for detection of antibodies to exogenous avian leukosis virus

A microplate enzyme-linked immunosorbent assay (ELISA) for detecting antibodies to avian leukosis virus (ALV) of subgroups A and B in infected chickens was developed with the use of Rous-associated virus (RAV)-1 (subgroup A) and RAV-2 (subgroup B) antigens purified by sucrose-gradient centrifugation. The antigen was used for ELISA after treatment with Triton X-100. In the ELISA, the subgroup viral antigen reacted strongly with homologous antiserum but also reacted with heterologous antiserum. Tests with serum absorbed with purified homologous and heterologous virus and tests for antigen-blocking by group-specific antibodies to ALV revealed that the reaction was caused mainly by subgroup-specific antibodies. The ELISA was 8 to 32 times more sensitive than the virus-neutralization (VN) test and detected antibodies to ALV earlier than the VN test in chickens infected experimentally with RAV-1 and RAV-2. In field application of the ELISA, 44.2% of 484 chicken sera were positive for RAV-1 and/or RAV-2 antigen, and 80.4% of flocks were positive. These findings indicate that ELISA is superior to the VN test in sensitivity, simplicity, rapidity, and applicability for large-scale field surveys for ALV infection.     

An indirect hemagglutination test for the detection of antibodies to Clostridium chauvoei

An indirect hemagglutination (IHA) test using sonicated extract as the antigen was developed for the detection of antibodies to Clostridium chauvoei. This antigen can be adsorbed onto glutaraldehyde-fixed sheep red blood cells treated with tannic acid and can be destroyed by trypsin and heat treatment. It corresponded well with the flagella of the organism, when analyzed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis and the gel diffusion test. No serological cross-reactivity was found in the IHA test when the antigen was tested against 4 species of clostridial antibodies. Our results suggest that the IHA test mainly detects antibodies against the flagella of C. chauvoei.