Female horse ejaculation. Ejaculates were collected to determine semen characteristics.

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Parameter Normal Values Ejaculate volume.

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The order of exposure to stallions and mares significantly affected ejaculate characteristics:

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PLoS One.

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Within-species studies on rodents suggest plasticity in response to the risk of sperm competition in sperm production and sperm allocation [ 1119 — 23 ].

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Kimura K, Chiba S Strategic ejaculation in simultaneously hermaphroditic land snails:

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However, these rather robust big brother nude moments differences do not exclude that i there could be treatment-specific within-subject changes in testosterone blood levels, and ii that testosterone blood levels correlate with different behavioral, morphological, or physiological traits dependent on the social environment.