Word: durocs
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Dates: during 1950-1959
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...Quarter Horse studs, Angus heifers, Hereford bulls, Hereford heifers, Angus steers. At each class he stood back, then circled around the animals, felt for firmness and fat. He passed to the Southdown fat lambs, the Rambouillet ewes, the Hampshire ewes. Finally he moved to the swine area for the Duroc fat barrows, the Berkshire fat barrows and the Poland gilts. Of all the classes, the fat lambs troubled him most ("and I raise them at home...
...Snell describes heterosis in the case of swine (Hampshires crossed with Duroc Jerseys produced superior pigs). Since he cannot repeat the same experiment with people, he sifts a great mass of records to look for self-propelled experiments in human hybridization...