Selective breeding also carries a risk of piggyback mutations. These are harmful traits that may accompany desirable ones. A classic example is the prevalence of a type of skin cancer associated with the dark-coat variant in Standard Poodles. The other concern across the board is inbreeding. It...
Contrary to the prediction of these workers, the offspring sex ratio (proportion of male pups at birth) was higher in the HS system than in the MTS system. These workers found that litter size did not vary with breeding system, so they inferred that sex-selective fetal wastage was not ...
heat tolerant, good egg layers, good mothers, and good meat birds. But none of that selective breeding has created chickens that are meant for long-distance flight, with flying muscles built for long, hard exertion. After all, why would we want our dinner to learn to...