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Purebred are those animals that have been bred-up to purebred status as a result of using full blood animals to cross with an animal of another breed. Artificial breeding via artificial insemination or embryo transfer is often used in sheep and cattle breeding to quickly expand, or improve purebred herds.
Animal breeding is a branch of animal science that addresses the evaluation (using best linear unbiased prediction and other methods) of the genetic value (estimated breeding value, EBV) of livestock. Selecting for breeding animals with superior EBV in growth rate, egg, meat, milk, or wool production, or with other desirable traits has ...
Also called functionalism. The Darwinian view that many or most physiological and behavioral traits of organisms are adaptations that have evolved for specific functions or for specific reasons (as opposed to being byproducts of the evolution of other traits, consequences of biological constraints, or the result of random variation). adaptive radiation The simultaneous or near-simultaneous ...
Fisher's fundamental theorem of natural selection is an idea about genetic variance [1] [2] in population genetics developed by the statistician and evolutionary biologist Ronald Fisher. The proper way of applying the abstract mathematics of the theorem to actual biology has been a matter of some debate, however, it is a true theorem.
Inbreeding animals will sometimes lead to genetic drift. The continuous overlaying of like genetics exposes recessive gene patterns that often lead to changes in reproduction performance, fitness, and ability to survive. A decrease in these areas is known as inbreeding depression. A hybrid between two inbred strains can be used to cancel out ...
Purebred breeding aims to establish and maintain stable traits, that animals will pass to the next generation. By "breeding the best to the best," employing a certain degree of inbreeding , considerable culling, and selection for "superior" qualities, one could develop a bloodline superior in certain respects to the original base stock.
While this definition is more broad, sex-limited genes are certainly included in this category. One of the key principles of sex-biased gene expression that Parsch and Ellegren stressed in their paper in February 2013 [13] is that of rapid evolution. They assert that a gene's sex bias can vary among different types of tissues throughout the ...
Animal breeding as an ancient human occupation, can be traced back to domestication and dates back to at least 14 thousand yrs ago. The modern processes of purebred breeding evolved between the late 18th century and the late 20th century, influenced significantly by advancements and increased understanding of genetics and eugenics.