Equine cyathostome populations: accuracy of species composition estimations     

Chapman MR  Kearney MT  Klei TR 《Veterinary parasitology》2003,116(1):15-21

Historically, surveys of equine parasites either are not quantitative in regard to prevalence and intensities of cyathostome species, or if quantitative, are estimates based on the identification of a very small sample of the population. Commonly 100-200 worms are identified. In the current study cyathostomes from 10 ponies were counted and identified to species in subsets of approximately 200 worms each from 5% aliquots of the large intestine contents until all worms in the aliquot were examined. A mean of 10.9+/-4.3 species were identified by examining 200 cyathostomes from each animal. This number increased to 25.2+/-2.6 species when the 5% aliquots were totally examined, indicating that prevalence rates from species with low intensities are probably much greater than previous survey data indicate. A statistical model was used to determine how many worms need to be identified to give a 95% confidence level that all species present are identified.  相似文献   

Pregnancy-associated Glycoprotein Profile during the First Trimester of Pregnancy in Egyptian Buffalo Cows     

KA El-Battawy  NM Sousa  O Szenci  JF Beckers 《Reproduction in domestic animals》2009,44(2):161-166

Pregnancy-associated glycoprotein (PAG) concentrations were measured in buffalo cows starting from day 28 after breeding. Oestrus was synchronized in 10 buffaloes using two injections of 25 mg prostraglandin (PG)F_{2 α} (Lutalyse^®) at a 11-day interval. Blood sampling was conducted nearly twice weekly. Results indicated that plasma PAG concentrations in non-pregnant buffaloes were low (<0.20 ng/ml) during the whole experimental period (day 28 to 103), while in pregnant animals plasma PAG levels increased from day 28 (4.48 ± 0.92 ng/ml) until day 41 (27.27 ± 6.74 ng/ml), remaining high (20.71 ± 9.20 ng/ml) until day 103. Progesterone levels were significantly (p < 0.0001) higher in pregnant (3.51–4.80 ng/ml) than in non-pregnant buffaloes (0.28–1.52 ng/ml). A significant difference (p < 0.0001) in plasma PAG concentrations between pregnant and non-pregnant animals starting at day 28 after breeding suggests that PAG-radioimmunoassay could be suitable for pregnancy diagnosis in buffaloes during this period. In conclusion, PAG test offers the advantages that it requires a single plasma sample for early pregnancy diagnosis as well as the accuracy of the test for the detection of pregnancy as early as day 28.  相似文献   

美国纪录片揭露该国食品内幕     

Christine Kearney 《中国禽业导刊》2009,26(18)

"人工增肥的大块鸡肉.新的致命大肠杆菌菌株.被少数几家大公司控制的食品供应链.……" 这就是纪录片<食品公司>(Food Inc.)所呈现的内容,该片于7月在美国上映,它讲述了美国食品业这些危险的变化,并指出了这对公共卫生、环境、工人及动物权利所造成的坏影响.  相似文献