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Jersey cattle are a small breed of dairy cattle. Originally bred in the Channel Island of Jersey, the breed is popular for the high butterfat content of its milk and the lower maintenance costs attending its lower bodyweight, as well as its genial disposition. == Characteristics== The Jersey cow is quite small ranging from only . The main factor contributing to the popularity of the breed has been their greater economy of production, due to: * The ability to carry a larger number of effective milking cows per unit area due to lower body weight, hence lower maintenance requirements, and superior grazing ability. * Calving ease and a relatively lower rate of dystocia, leading to their popularity in crossbreeding with other dairy and even beef breeds to reduce calving related injuries. * High fertility * High butterfat conditions, 4.84% butterfat and 3.95% protein, and the ability to thrive on locally produced food.〔Rex Paterson in Jersey Cattle, ed. Boston, 1954, pp81-95〕 Bulls are also small, ranging from 540 to 820 kg (1200 to 1800 pounds), and are notoriously aggressive. Castrated males can be trained into fine oxen which, due to their small size and gentle nature, make them popular with young teamsters. Jersey oxen are not as strong as larger breeds however and are generally out of favour among competitive teamsters. Due to the small size, docile and inquisitive character and attractive features of the Jersey cow, small herds were imported into England by aristocratic landowners as adornment for aesthetically landscaped parks. Jerseys come in all shades of brown, from light tan to almost black. They are frequently fawn in colour. All purebred Jerseys have a lighter band around their muzzle, a dark switch (long hair on the end of the tail), and black hooves, although in recent years color regulations have been relaxed to allow a broadening of the gene pool. The cows are calm and docile animals, but tend to be a little more nervous than other dairy cow breeds. Jersey bulls are another matter. While all dairy bulls are considered as dangerous animals, Jersey bulls are considered by many to be the least docile of the dairy breeds.〔http://www.ansi.okstate.edu/breeds/cattle/jersey〕 The cows are also highly recommended cows for first time owners and marginal pasture. Jersey cattle have a greater tendency towards post-parturient hypocalcaemia (or "milk fever") in dams, and tend to have frail calves that require more attentive management in cold weather than other dairy breeds due to their smaller body mass and greater relative surface area. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Jersey cattle」の詳細全文を読む スポンサード リンク
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