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经过两个年龄段4个试验组的蛋鸡研究结果表明:(1)随着其的增长蛋有增厚的趋势,而蛋壳强度却不产产;(2)午后添加贝粉对蛋壳厚度的影响因年龄而......
对红腹锦鸡卵在孵化过程中的重量变化进行了研究,同时测定了孵化前的卵重及卵径,记录了产卵期及孵化期。结果表明:未经孵化的卵平均卵......