Gonadal and extra-gonadal sperm reserves were deter¬ mined for nine 36-month-old Holstein bulls 23 weeks after unilateral * Authorized for publication on 19th June 1961, as Paper No. 2569 in the journal series of the Pennsylvania Agricultural Experiment Station. t A portion of the data contained in this paper is from a thesis submitted by the senior author to the Graduate School of The Pennsylvania State University in partial fulfillment of the requirements for the degree of Doctor of Philosophy.
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