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《Progress In Veterinary Medicine》 2001-04
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Ultrasonographic Determination of Equine Fetal Gender

CHEN Shi en (Animal Science Department of Northwest Minorities University,Lanzhou,Gansu,730030,Chian)  
The method was used in the fetal gender diagnosis at auuracy rate of 978% (182/186) of males and 99.4% (160/161) of females when it could locate the genital tubercle between the tail and umbilical cord. The optimal days for fetal gender determination are between day 59 and day 68 of gestation. The method of mid gestation diagnosis of fetal gender is very reliable,too. There is 100% agreement in gender determination between the results obtained by ultrasonography and those obtained at birth. In males, the penis and/or the prepuce are routinely imaged from 100 days to 220 days gestation. In females, the mammary glands and teats are observed from 118 days to 227 days of gestation. The 5 MHz linear transducer, routinely used in equine reproduction, allows gender diagnosis up to 160 days gestation in most cases. When the fetus is located too high in the mare's abdomen or when its size exceeds the capacity of the ultrasound equipment, a 3.5 MHz probe has to be used. Both ultrasound techniques are very accurate, provided gender identification is made during the optimal window of time, with recognition of the correct anatomical structures.
【CateGory Index】: S821.2
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【Co-references】
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1 MA Yi, SUN Chao, MA Yong-jiang, CAO Bin-yun (College of Animal Scinece and veterinary Medicine, Northwest Northwest and Technology University of Agriculture and Forestry, YangLing, Shaanxi 712100, China );Applications of Ultrasonogrpahy in Bovine Reproduction[J];Journal of Yellow Cattle Science;2000-05
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1 QIU Shi1,2,WEI Qi-wei1,2,3,CHEN Xi-hua2,3,ZHAN Yan-zhen1,2,YANG Lu1,2 (1.College of Fisheries,Huazhong Agricultural University,Wuhan 430070,China;2.Key Laboratory of Freshwater Biodiversity Conservation and Utilization,Ministry of Agriculture of China;Yangtze River Fisheries Research Institute,Chinese Academy of Fishery Sciences,Jingzhou 434000,China;3. Freshwater Fisheries Research Center,Chinese Academy of Fishery Sciences,Wuxi 214081,China);Ultrasonography of heart of Chinese sturgeon(Acipenser sinensis)[J];Journal of Fishery Sciences of China;2009-04
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