Quaestiones Naturales

Is it because very fat goats (τράγοι) are less able to procreate, nay, scarce able to use coition, by reason of their fatness Seed is the superfluity of the aliment which is allotted to the body: now, when either an animal or a plant is of a very strong constitution and grows fat, it is a sign that all the nourishment is spent within, and that there is little and base excrement, or none at all.