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Pseudorabies virus (PRV) was not transmitted horizontally from 3 PRV-infected calves to 2 contact control calves during 4 days of comingling in experiment 1. Although these contact control calves developed clinical signs of pseudorabies when infected intranasally with PRV in experiment 2, they did not transmit PRV to a second pair of contact control calves. However, 1 of 2 pigs comingled with these 4 calves seroconverted. During both experiments, moderate amounts (10(2) to 10(5) TCID50) of PRV were present in the nasal secretions of the infected calves during the contact periods. All infected calves traumatized their nares or periorbital tissue. Infected calves developed a nonsuppurative meningoencephalitis mainly involving the brain stem. Four of the 5 infected calves had nonsuppurative ganglioneuritis and acute lymphoid necrosis of germinal centers. Virus could not be recovered from nasal and tonsillar swab samples from contact-control calves and pigs. 相似文献
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ZHANG Li-xin LIU Wei Mesfin Tsegaw XU Xin QI Yan-ping Enoch Sapey LIU Lu-ping WU Ting-ting SUN Shi HAN Tian-fu 《农业科学学报》2020,19(2):295-310
As a short-day(SD) and thermophilic plant, soybean(Glycine max(L.) Merr.) is sensitive to photo-thermal conditions. This characteristic severely limits the cultivation range of a given soybean cultivar and affects the performances of agronomic traits such as yield, plant architectures, and seed quality. Therefore, understanding the mechanism of photo-thermal sensitivity will provide a theoretical basis for soybean improvement. In this review, we introduce the advances in physiological, genetic, and molecular researches in photoperiodism of soybean, and progress in the improvement of the photo-thermal adaptability. We also summarize the photo-thermal conditions and characteristics of widely-planted soybean cultivars of major production regions in China. Furthermore, we proposed a novel concept of ‘ecotyping' and the strategies for widely-adapted soybean cultivar breeding. This review provides an important guide for improving the adaptability of soybean. 相似文献