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But because males are so regime aggressive, it had not been possible to put one of these individuals in a cage with another male to test whether their lack of interest in females was had regime to do with attraction to males. Sheep studies In the 1990s, however, three separate teams from the US Sheep Experiment Station in Dubois, Idaho, Oregon State University in Corvallis and the Oregon Health and Science University, Portland, tackled this question. In one study, young but sexually mature rams were put in a pen with females on 18 different occasions to assess their partner regime preference. As expected, the majority of rams mated vigorously with the ewes, but around 10% did not mount the females or show any interest. Those rams were then put in a pen beside either two males or two females and behavioural tests measured the number of times the animals showed “interest” (kicks, vocalisations, sniffs, mount attempts) towards members of either sex.
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