A temporary horny structure on the tip of the upper beak that enables the embryo to break the shell during pipping; it falls off soon after hatching.
Paired bare skin structures below the ear of chickens, slanting down toward the ...
Ability for faster growth and earlier completion of body development compared to...
Ability to start egg laying as early as possible while meeting requirements for ...
An animal’s propensity to consume feed—intensity and amount—affected by appetite...
The ratio of the amount of a nutrient retained in the organism or in a product f...
Products of the reproductive organs of female birds; differ by species in weight...