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Mares carry their young (called foals) for approximately 11 months from conception to birth. (Average range 320–370 days.) [2] Usually just one young is born; twins are rare. When a domesticated mare foals, she nurses the foal for at least four to six months before it is weaned, though mares in the wild may allow a foal to nurse for up to a year.
Foals receive stimulation of certain neurosteroids that keep them "quiet" during gestation. This is important for the health and safety of both mare and foal. If a foal were to move around similarly to humans during gestation, injuries and possible miscarriage could occur. These neurosteroids ensure that the foal remains relatively still in the ...
The species prefers a warm and moist environment and is most likely to infest horses and monkeys, [1] and particularly the proximal small intestines of foals. [2] Their eggs can be found in the feces of fouls which are younger than two months ; larvae can be isolated in the milk of the mare from day five to day 45 postpartum; [3] also can occur in liver, lungs and mammary tissue; Parasitic ...
A stallion mating with a mare. While horses in the wild mate and foal in mid to late spring, in the case of horses domestically bred for competitive purposes, especially horse racing, it is desirable that they be born as close to January 1 in the northern hemisphere or August 1 in the southern hemisphere as possible, [11] so as to be at an ...
A foal at about weaning age. A foal is an equine up to one year old; this term is used mainly for horses, but can be used for donkeys. More specific terms are colt for a male foal and filly for a female foal, and are used until the horse is three or four. When the foal is nursing from its dam (mother), it may also be called a "suckling".
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.
Altricial birds are less able to contribute nutrients in the pre-natal stage; their eggs are smaller and their young are still in need of much attention and protection from predators. This may be related to r/K selection; however, this association fails in some cases. [18] In birds, altricial young usually grow faster than precocial young.
The black mountain salamander mother broods her eggs, guarding them from predation as the larvae feed on the yolks of their eggs. They eventually break their way out of the egg capsules and disperse. [23] Some species of Gymnophiona (caecilians, with long, cylindrical, limbless bodies) brood their eggs. [24] A brooding female python.