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Ren, D., Xing, Y., Lan, L., Huang, L., Lin, M., Wu, Y., Li, K., Li, W., Yang, S., Guo, T., Ren, J., Ma, J.. Wiley-Blackwell Verlag; 2009. Evaluations of boar gonad development, spermatogenesis with regard to semen characteristics, libido and serum testosterone levels based on large white Duroc x Chinese Erhualian crossbred boars.