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MOTION PICTURE ANALYSIS OF EJACULATION IN THE BULL

Summary.: The following criteria, expressed as average figures, were evaluated from motion pictures of ejaculation in the bull: (1) the length of the penis extension from the entrance of the artificial vagina (AV) was 53·4 cm, (2) the time between initial contact of the penis with the AV and the initiation of semen emission was 0·97 sec, and (3) the semen emission time was 0·29 sec. Coiling of the glans penis was observed in about half of the ejaculates, ranging from a slight twist to a 360° counter-clockwise coil 6 cm in outside diameter. There was a rhythmic movement of the fore-limb dew claws during ejaculation which appears to be a characteristic of sexual behaviour in the bull. Various abnormalities were observed in thrust and semen emission patterns using a short, low temperature AV. The large amounts of semen lost on the sides of the experimental AV suggest that an AV of proper length should be used for each bull.