In 2 trials, twelve 15-month-old and ten 27-month-old sexually naive Simmental bulls were libido tested in the presence or absence of a dominant mature bull. In the 1st trial, individual sexual performance tests were conducted. On alternate tests days, a mature bull was present in an adjacent pen to where the stimulus female stanchion was attached. In the 2nd trial, same age animals were exposed, as a group, to a female. On alternate test days a mature bull was present, allowing physical contact with the tested bulls. In trial 1, the presence of a dominant bull did not affect sexual behaviour activities or libido scores within age groups. Nevertheless, in the older group, the time spent close to the stimulus female was reduced during mature male presence (P = 0.02). In trial 2, both age groups were affected by the physical presence of the mature bull, and the number of times that the animals were seen in sexual proximity with the stimulus female was reduced (P<0.01).
|Publication Title||Applied Animal Behaviour Science|
|Author Address||Posgrado Interinstitucional en Ciencias Pecuarias, Universidad Autonoma de Colima, Colima, Mexico.|
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