Fertility of Progestagen-Treated Ewes in Relation to the Numbers and Concentration of Spermatozoa in the Inseminate

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Abstract
Eight hundred Merino ewes in which oestrus was synchronized with progestagen.impregnated sponges were incorporated into an experiment of parallelogram design (4 X 5; n = 40) in which four doses (numbers) of spermatozoa were inseminated in five concentrations (numbers/ml), which involved a range in volume of inseminate from 0�012 ml to 1 �6 m!. The purpose was to determine the importance on fertility of the number of spermatozoa relative to the degree of dilution, i.e. their concentration and the consequent volume in which a given number was inseminated. All ewes were inseminated 48 hr after withdrawal of sponges.

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