驻马店某鸡场发生一起以呼吸困难、眼肿、下痢和产蛋量下降为特征的传染病.经流行病学、症状病变及实验室诊断确定为鸡支原体与大......

民勤县某孵化场11批累计入孵种蛋181500枚，受精蛋166073枚，受精率91．50％。孵化后期死胚5431枚，出雏期死胚3737枚，啄死病雏2093只；出壳病雏......

The known mycoplasmas isolated from goats and sheep were listed.The pathogenicity of these mycoplasmas and their effects......