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Because male chickens do not lay eggs and only those in breeding programmes are required to fertilise eggs, they are considered redundant to the egg-laying industry and are usually killed shortly after being sexed, which occurs just days after they are conceived or after they hatch. [3]
More animal friendly because the day-old male chicks no longer need to be culled, and more sustainable because less energy is used because only the female eggs need to be further incubated after sexing. [5] The male eggs are sorted out and can be used for different purposes such as an alternative high-value protein source. [6]
Vent sexing, also known simply as venting, involves squeezing the feces out of the chick, which opens up the chick's anal vent (called a cloaca) slightly, allowing the chicken sexer to see if the chick has a small "bump", which would indicate that the chick is a male. Some females also have bumps, though they are rarely as large as those of ...
Therefore, those fed a lower quality diet produced more sons, while those fed a higher quality diet produced more daughters (bigger, more nutrient-rich eggs) because, in nature, female offspring need more nourishment than males to survive and grow. Males need less nourishment because they do not lay eggs.
The chickens laid more eggs and experienced lower mortality and less illness. Upon this discovery, farmers transitioned from expensive animal proteins to comparatively inexpensive antibiotics and B12. Chickens were now reaching their market weight at a much faster rate and at a lower cost.
The deaths impacted egg inventories, which were 29% lower in December 2022 just as eggs had increased demand due to the winter holiday season, as opposed to the beginning of the year.
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(True) oviparity, in which fertilization is internal, is taken to be the derived condition, whether the male injects the sperm into the female intromittently or whether she actively or passively picks it up — the female lays eggs containing zygotes with a substantial quantity of yolk to feed the embryo while it remains in the egg, and in many ...