The annual cycle of gonad development and the fertilization of the nemertean, Procephalothrix simulus, were studied by histological method.
用组织切片法对扁额原细首纽虫周年性腺发育及受精过程进行了初步的研究。
The experiment was conducted to study the effects of cold stress and selenium levels on gonad development and relative hormone in young laying ducks (12 ~ 16 weeks) in cage.
本试验旨在研究低温和硒对育成期(12 ~16周龄)笼养蛋鸭性发育及相关激素的影响。
The experiment was conducted to study the effects of cold stress and selenium levels on gonad development and relative hormone in young laying ducks (12 ~ 16 weeks) in cage.
本试验旨在研究低温和硒对育成期(12 ~16周龄)笼养蛋鸭性发育及相关激素的影响。
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