* Pheromonal substances in the urine act as a stimulus to enhance the onset of puberty.
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* Females reaching puberty in the presence of a male (producing the pheromones) have a greater opportunity of becoming pregnant.
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* Pubertal onset cannot be accelerated using pheromones in animals that have not achieved the appropriate metabolic body size to trigger hypothalamic responsiveness to Oestradiol (oestrogen).