Male mitochondrial inheritance was recently discovered in Plymouth Rock chickens.

Even the animals are turn-of-the-century sorts: Plymouth Rock chickens, for instance, two Berkshire sows and appropriate horses, cows and mules.

The blastoderm (Barred Plymouth Rock chickens) isolated from the yolk was separated into three portions: the central disc, the marginal zone and the area opaca.

It was created by cross-breeding Barred Plymouth Rock chicken, Leghorns, Cambars, and in the case of Cream Legbars, Araucanas.

Rous Sarcoma virus and the src gene: First isolated in 1911 by Rous, capable of transmitting a sarcoma between Plymouth Rock chickens.

White Plymouth Rock chickens carry a considerable mixture of genes taken from other breeds different from the original Barred Plymouth Rock from which the white variety originates.

The Rock Cornish game hen or Rock Cornish hen is a cross between the Cornish Game and White Plymouth Rock chicken breeds.

The Yuills began breeding Shropshire sheep, Berkshire hogs, and Barred Plymouth Rock chickens, but the most important animals raised on their farm were Ayrshire cattle, which they began breeding in 1868.

RSV was discovered in 1911 by Peyton Rous, working at Rockefeller University in New York City, by injecting cell free extract of chicken tumour into healthy Plymouth Rock chickens.