Induction of the acrosome reaction in ejaculated goat spermatozoa by preincubation in chemically defined medium

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<jats:title>Abstract</jats:title><jats:p>The aim of the present study was to examine the effects of the elimination of energy substrate from the medium and the effects of the preincubation vessel, temperature, and time on the induction of the acrosome reaction in ejaculated goat spermatozoa in chemically defined medium. Washed spermatozoa were resuspended in Brackett–Oliphant (BO) medium or substrate‐free BO medium to give a high concentration and preincubated in open test tubes or sealed glass tubes at 37.0 or 39.5°C for 1, 2, or 3 h. Sperm acrosome reaction was evaluated using a simplified triple‐stain technique and a hamster test. It was found that the goat sperm acrosome reaction occurred more readily in the sealed glass tubes than in open test tubes, in substrate‐free BO medium than in BO medium, and at 39.5 than at 37.0°C. During preincubation with substrate‐free BO medium in sealed glass tubes at 39.5°C, the optimum time necessary to induce the acrosome reaction in goat spermatozoa was 2–3 h.</jats:p>

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