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A typical precocial mammal has a gestation period almost four times longer than a typical altricial mammal of the same body size. [20] Precocial mammal species generally have greater adult body weights than altricial mammals as precocial mammals have markedly longer gestation periods than altricial mammals. [21]
Gestation, called pregnancy in humans, is the period of time during which the fetus develops, dividing via mitosis inside the female. During this time, the fetus receives all of its nutrition and oxygenated blood from the female, filtered through the placenta , which is attached to the fetus' abdomen via an umbilical cord .
The duration of this period varies between species. For most species, the amount a fetus grows before birth determines the length of the gestation period. Smaller species normally have a shorter gestation period than larger animals. [2] For example, a cat's gestation normally takes 58–65 days while an elephant's takes nearly 2 years (21 ...
In the latter, the eggs develop in utero for about 28 days, with only about 10 days of external incubation (in contrast to a chicken egg, which spends about one day in tract and 21 days externally). [11] After laying her eggs, the female curls around them. The incubation period is divided into three phases.
Cape robin-chat (at right) feeding a red-chested cuckoo parasite chick. The Cape robin-chats are monogamous and highly territorial nesters. [19] A pair's territory usually comprises some fraction of a hectare, but its extent varies considerably depending on the habitat. [18] The nest site is within 5 feet (regularly 0 – 2 feet) from the ground.
Cattle raised for human consumption are called beef cattle. Within the beef cattle industry in parts of the United States, the term beef (plural beeves) is still used in its archaic sense to refer to an animal of either sex. Cows of certain breeds that are kept for the milk they give are called dairy cows or milking cows (formerly milch cows).
The Australian Friesian Sahiwal, is an Australian breed of dairy cattle whose development commenced in the 1960s by the Queensland Government. It is a combination of the Sahiwal , a dairy breed of Bos indicus from Pakistan and Holstein ( Bos taurus ) breeds, designed for the tropical regions of Australia.
The Australian Charbray (Bos taurus x Bos indicus) is an Australian breed of cattle derived from a cross between the French Charolais cattle and American Brahman cattle.The charbray breed was first conceived in the United States of America in the 1930s and later introduced into Australia in 1969. [1]