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More developed infants will typically require a longer gestation period. Altricial mammals needs less time to gestate compare to the precocial (well-developed neonate) mammal. A typical precocial mammal has a gestation period almost four times longer than a typical altricial mammal of the same body size. [20]
Gestation length is an indicator of the probability of dystocia. The longer a calf is in utero the larger it will be at birth and the greater the chance of it having dystocia. It also gives the cow a larger postpartum interval between pregnancies. A shorter gestation length is usually preferred because of this. [2]
Cattle breeds fall into two main types, which are regarded as either two closely related species, or two subspecies of one species. Bos indicus (or Bos taurus indicus ) cattle, commonly called zebu, are adapted to hot climates and originated in the tropical parts of the world such as India, Sub-saharan Africa, China, and Southeast Asia.
The Droughtmaster is an Australian breed of beef cattle. It was developed from about 1915 in North Queensland by crossing zebuine cattle with cattle of British origin, principally the Beef Shorthorn. It was the first Australian taurindicine hybrid breed; [3]: 171 it is approximately 50% Bos indicus and 50% Bos taurus. [4]
In the U.S., the standard for dairy cattle evaluation is provided by the Dairy Cow Unified Scorecard, created by the Purebred Dairy Cattle Association. ( PDCA ) [ 2 ] This system of evaluation is the industry standard, and is advised by the Holstein Foundation, Holstein UK, the FFA and 4-H Organizations, and the World Dairy Expo.
The Romagnola is a breed of cattle from the Emilia-Romagna region of Northern Italy.It belongs to the Podolic group of grey cattle. Romagnola cattle were used principally as draught beasts in the past; since the mechanisation of agriculture in the middle of the twentieth century they have been bred primarily for beef production.
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]
The size of the bovine genome is 2.7 Gb (2.7 billion base pairs). [4] It contains approximately 35,092 [4] genes of which 14,000 are common to all mammalian species. Bovines share 80 percent of their genes with humans; cows are less similar to humans than rodents (humans and rodents belong to the clade of Supraprimates) and dogs (humans and dogs belong to the clade of Boreoeutheria).