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A female bovine that has not yet had a calf is known as a heifer. An adult female that has had her first calf (or second calf, depending upon regional usage) is called a cow. Steers and heifers can sometimes be colloquially referred to as "cows," especially by non-agricultural people who are not familiar with the appropriate terminology.
Before 1790, beef cattle averaged only 160 kg (350 lb) net. Thereafter, weights climbed steadily. [ 8 ] [ 9 ] Cattle breeds vary widely in size; the tallest and heaviest is the Chianina , where a mature bull may be up to 1.8 m (5 ft 11 in) at the shoulder, and may reach 1,280 kg (2,820 lb) in weight. [ 10 ]
Natural polling occurs in cattle, yaks, water buffalo, and goats, and in these animals it affects both sexes equally; in sheep, by contrast, both sexes may be horned, both polled, or only the females polled. The history of breeding polled livestock starts about 6000 years BC.
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Female cattle, also referred to as "heifers" in agriculture, will gradually enter standing estrus, or "standing heat," starting at puberty between 9 and 15 months of age. The cow estrous cycle typically lasts 21 days. [5] Standing estrus is a visual cue which signifies sexual receptivity for mounting by male cattle.
A freemartin or free-martin (sometimes martin heifer) is an infertile cow with masculinized behavior and non-functioning ovaries. [1] Phenotypically, the animal appears female, but various aspects of female reproductive development are altered due to acquisition of anti-Müllerian hormone from the male twin. [2]
Milkshake, a 1,200-lb. cow, was trapped by an animal hoarder in a tiny 10x10 pen from the time she was two. A California cow called Milkshake (because she's so sweet!) is having an identity crisis ...
A Highland miniature cow calf has the cutest morning routine. First she gets up, and then she books it over to her dad's enclosure — all just so she can greet him at the start of her day.