Summary

Sanders Spencer The Pig: Breeding, Rearing, and Marketing

The far too common practice is to purchase each boar required from a totally different herd, or from one of quite dissimilar breeding, with the result that there is not the slightest uniformity in the appearance or character of the herd, or of the mature animals when ready for market.
It is far too frequently forgotten that the chief value of a record of the pedigree is that by it one can trace the breeding of the animal's progenitors, and thus one is enabled to form some opinion of the probable produce—providing it is possible to learn the chief characteristics of the progenitors.
Source: Gutenberg

Sanders Spencer The Pig: Breeding, Rearing, and Marketing

Of course, the best of all systems is to allow the sow its complete freedom at all seasons of the year save when she is within about a fortnight of her time, and when she is rearing a litter of pigs. Even if there be no grass field or paddock in which she is able to pick up a good portion of her living, or a roadside where she can get a few blades of grass, an open yard is infinitely better than the confinement of a sty, as apart from the reduction in the cost of keep, the sow will produce stronger pigs, and have a decidedly easier time of farrowing.
Source: Gutenberg

Sanders Spencer The Pig: Breeding, Rearing, and Marketing

It is impossible to agree with the view held by so many persons that the necessity for the same care is non-existent in the selection of a sow as in the choice of a boar. We hold that the desirability for studying the forbears, especially the dam, of a young sow intended for breeding purposes is fully as great as when selecting the young boar, since many, if not most, of the qualities which we desire the brood sow to possess are strongly hereditary.
Source: Gutenberg

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