For example, purebred lowland flocks produce rams, which are, in turn, demanded as terminal sires by lowland finishing flocks.
Genetic gain of pure line selection and combined crossbred purebred selection with constrained inbreeding.
In those years, investment in purebred livestock fell precipitously.
Because pure-breeding creates a limited gene pool, purebred animal breeds are also susceptible to a wide range of congenital health problems.
He acquired stock from all known purebred breeders, and used selective breeding to maintain the breed standard.
However, studies of longevity in dogs have found some advantage for crossbreeds compared to purebred dogs.
Eventually, purebred dogs only remained with herders, breed enthusiasts and farms, with a surfeit of crosses elsewhere.
Hank claims to be a purebred cowdog but is in fact most likely a mutt.
