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But in altering the breeding season, man has to assume

the responsibility of providing food and shelter unavailable in natural conditions. This is expensive, and so, where out-of- season breeding shows no advantage, he does not interfere. We do not eat the eggs of the goose ; therefore, we leave her to her own devices. A foal born in mid-winter shows no more profit than one born in spring ; so the mare, too, follows the way of Nature. Mountain sheep if they dropped their lambs in winter, would be more profitable than if they lambed in spring, as they now do, were it not that the high cost of pro- viding food and shelter for mountain flocks is so high that the venture would result in a loss.

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