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Lack's principle implies that birds that happen to lay more eggs than the optimum will most likely have fewer fledglings (young that successfully fly from the nest) because the parent birds will be unable to collect enough food for them all. [1]
Among passerine birds, masked shrikes have been recorded stealing food from wheatears, [25] and Eurasian blackbirds have been recorded stealing smashed snails from other thrushes. [ 22 ] During seabird nesting seasons, frigatebirds soar above seabird colonies , waiting for parent birds to return to their nests with food for their young.
While a single specific cause is unknown, chronic egg laying is believed to be triggered by hormonal imbalances influenced by a series of external factors. [1] As in the domestic chicken, female parrots are capable of producing eggs without the involvement of a male – it is a biological process that may be triggered by environmental cues such as day length (days becoming longer, indicating ...
As male birds of the laying strain do not lay eggs and are not suitable for meat production, they generally are killed soon after they hatch. [121] Free-range eggs are considered by some advocates to be an acceptable substitute to factory-farmed eggs. Free-range laying hens are given outdoor access instead of being contained in crowded cages ...
FILE - Eggs are displayed on store shelves at a local grocery store in Chandler, Ariz., Jan. 21, 2023. Amid soaring egg prices, social media users are claiming that common chicken feed products ...
Forced molting typically involves the removal of food and/or water from poultry for an extended period of time to reinvigorate egg-laying. Forced molting, sometimes known as induced molting, is the practice by some poultry industries of artificially provoking a flock to molt simultaneously, typically by withdrawing food for 7–14 days and sometimes also withdrawing water for an extended period.
The egg is not retained in the body for most of the period of development of the embryo within the egg, which is the main distinction between oviparity and ovoviviparity. [1] Oviparity occurs in all birds, most reptiles, some fishes, and most arthropods. Among mammals, monotremes (four species of echidna, and the platypus) are uniquely oviparous.
During co-nesting, before a bird starts laying its own eggs, it will toss out eggs laid previously by other females. [8] As a result, the last egg-layers may contribute more eggs to the common nest, [ 8 ] and this will increase the chances that newly laid eggs bearing the genetic material of that female will have a better chance of survival.