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排序方式: 共有114条查询结果,搜索用时 46 毫秒
111.
Inger M Brunborg Christine M Jonassen Torfinn Moldal Bj?rn Bratberg Bj?rn Lium Frank Koenen Jürgen Sch?nheit 《Journal of veterinary diagnostic investigation》2007,19(4):368-375
During a period of 1.5 months, a newly established pig herd experienced a high number of mummifications and stillbirths, a high neonatal mortality rate, and many piglets with congenital tremors or hind leg ataxia. After clinical and histological investigations, the submitted animals were divided into 4 groups: mummified or stillborn (N = 6), live born with myocarditis (N = 5) (average age 22.8 days), live born without myocarditis (N = 14) (average age 20.0 days), and control animals from a different herd (N = 5) (newborn). Statistically significant differences were observed in the mean porcine circovirus 2 (PCV2) load among the 4 groups in the liver (P < 0.0001). The presence of PCV2 antigen within the myocardial lesions was confirmed by immunohistochemistry. A high load of PCV2 DNA was observed in myocardium, liver, and spleen from mummified or stillborn piglets (>1 x 10(7) copies per 500 ng DNA), lower in piglets with myocarditis (>1 x 10(5) copies per 500 ng DNA), and even further lower in pigs without myocarditis (<1 x 10(5) copies per 500 ng DNA), whereas no PCV2 DNA was detected in the control animals. Myocardium, liver, and spleen were well suited for routine testing of fetuses and young piglets by quantitative real-time polymerase chain reaction. Neither porcine parvovirus nor encepaholomyocarditis virus was detected. These results indicate that the PCV2 infection might have been of etiological importance for the fetal deaths and piglet mortality observed in this herd. 相似文献
112.
Hallgren S Volkova K Reyhanian N Olsén KH Hällström IP 《Fish physiology and biochemistry》2011,37(4):911-918
Behaviour studies are used in toxicology research as they are excellent tools to measure physiological end-points caused by
exogenous chemicals. In mammals both reproductive and non-reproductive behaviours have been used for a long period of time,
whereas in teleost fishes non-reproductive behaviours have received little attention compared to reproductive behaviours.
Recent advances in measuring stress related behaviours in zebrafish have provided additional tools to understand behaviour
toxicology in fish. One species with well documented reproductive behaviour disturbed by different toxicants is the guppy,
which is better suited than zebrafish for reproductive behaviour studies and therefore might be a better model organism for
comparative behaviour studies in fish toxicology. Here we report new applications for non-reproductive behaviours in guppy
and test these behaviours on males treated with the endocrine disruptor 17α-ethynylestradiol at environmentally relevant concentrations.
17α-ethynylestradiol increased freezing and bottom-dwelling when fish were placed in a non-familiar aquarium, but did not
significantly affect shoaling behaviour. These results are similar to the anxiogenic behaviours seen in rats treated perinatally
with 17α-ethynylestradiol and add more concern to the impacts of endocrine disruptors on aquatic wildlife. 相似文献
113.
Inger Lise Andersen Gunhild Melbø Tajet Ingeborg Anni Haukvik Solveig Kongsrud Knut Egil Bøe 《Acta Agriculturae Scandinavica, Section A - Animal Sciences》2013,63(1):38-45
Abstract The objective of this study was to investigate management routines and environmental factors influencing postnatal piglet mortality in commercial herds with individually loose-housed sows. Last year production records from 39 herds were used. We gathered information on specific routines as well as environmental factors by visiting every farm once. Herds practising moderate roughage feeding during pregnancy tended to have lower piglet mortality (p=0.06). Use of farrowing rails along all the sides of the pen resulted in lower piglet mortality than when no rails were present (p<0.01). Herds that hardly used any litter in the sow area at the time of farrowing had significantly higher piglet mortality than herds that used a moderate or large amount (p<0.05). Helping the piglets to obtain colostrum immediately after birth also reduced mortality (p<0.05), whereas other routines such as shutting the piglets inside the creep area while feeding the sow did not have any significant effect. 相似文献
114.