A Dissertation on Horses by Osmer, William

But the most material thing in breeding all animals, and to which we pay the least regard, either in the race of men or Horses, is the choice of the female, who not only joins in the production of the foetus, but in the formation of it also. And that the female has even the greatest share in the production of the foetus, will be proved by this instance: if you take a dunghill cock and put to a game hen, and also put a brother of that game hen to a sister of the dunghill cock, those chickens bred from the game hen will be found much superior to those chickens bred from the dunghill hen.

And here I beg leave to be allowed (without the imputation of pedantry) one quotation from Virgil, who is supposed to have well understood the laws of nature. In his description of the choice of animals for procreation, in the third chapter of his Georgic's, and the 49th verse, you will find it thus written:

"Seu quis Olympiacea mieratus praemia palme, "Pascit Equos, feu quis fortes ad aratra Juvencos, "Corpora praecipue matrum legat."

But I should not escape the censure of the critics on this occasion, I expect the thanks of all the handsome well-made women in the kingdom, for this hint, who understand Latin; and where they do not, I hope their paramours will instill the meaning of it, as deeply as they can into them. But to return to the breeding of Horses.

We pay little regard to the mechanism of the female, or of the Horse to which we put her, but generally choose some particular Horse for the sake of the cross, or because he is called an Arabian; whereas, in fact, every Stallion will not be suited to every Mare, but he who has a fine female, and judgment enough to adapt her shapes with propriety to a fine male, will always breed the best racer, let the sort of blood be what it will, always supposing it to be totally foreign. The truth of this will be confirmed by our observation, which shews us, that Horses do race, and do not race, of all families and all crosses.

We find also, that affinity of blood in the brute creation, if not continued too long in the same channel, is no impediment to the perfection of the animal, for experience teaches us, it will hold good many years in the breed of game cocks. Besides, we know that Childers, which was perhaps the best racer ever bred in this kingdom, had in his veins a consanguinity of blood; his pedigree informing us, that his great grandam was got by Spanker, the dam of which Mare was also the dam of the said Spanker.