farmyard chickenmeat breedsornamental breedsChickens have coexisted with people for centuries. They have been a staple in farmyards around the world providing nutritious eggs and meat. All of today's many breeds of chickens come from a single origin鈥攖he red jungle fowl of Southeast Asia. This ...
The king penguin breeds in colonies of up to 40,000 pairs. Standing on wet beaches or snowy surfaces they brood a single egg on their feet, while moving around a bit waiting for the other parent to return from sea. Smell or visual cues are not sufficient to recognize and find each othe...
Inversely, plasma PRL rapidly decreases in captive female common eiders (Somateria mollissima) that are deprived of their eggs (Criscuolo et al., 2002). And in the chicken hen, a precocial species, physical contact with chicks stimulates brooding behavior and precipitates a decrease in plasma PRL...
This review describes the features of some particular chicken breeds. For each chicken breed is reported the use, as dual purpose or ornamental fowl. In Table1the average standard weight for each breed is reported, respectively for males and females. The first one is the Jersey Giant, the lar...
Is a carbohydrate fermentation disorder of the rumen that usually affect goats of all breeds and ages, as a result of feeding with large amount of highly fermentable concentrates, underfeeding of effective fiber and poor management practices. ...
Remes V, Szekely T (2010) Domestic chickens defy Rensch’s rule: sexual size dimorphism in chicken breeds. J Evol Biol 23:2754–2759 Article CAS PubMed Google Scholar Rigou Y, Guillemette M (2010) Foraging effort and pre-laying strategy in breeding common eiders. Waterbirds 33:314–322 ...
There are no living turkey-chicken crosses, and they cannot crossbreed naturally. Somehybridization experimentshave shown that it’s possible to fertilize turkey hen eggs with male chicken sperm; only male embryos could develop, but up to a point – no eggs ever hatched. ...
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Add to this that the America’s egg industry breeds more than 200 million replacement hens every year, and that it’s standard practice for dairy cows to be kept pregnant nine months out of every year. What happens to the males born in these systems? Male chicks are unwanted since, being...
A total of 70 female sheep (White Polled Heath sheep and their cross breeds), consisting of 16 animals older than one year and 54 gimmers, participated in this study, which ran over two grazing seasons from May until October 2020 and 2021, respectively. The non-pigmented animals with white...