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Sheep have a breeding season (tupping) in the autumn, though some can breed year-round. [1] As a result of the influence of humans on sheep breeding, ewes often produce multiple lambs. This increase in lamb births, both in number and birth weight, may cause problems with delivery and lamb survival, requiring the intervention of shepherds. [2]
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]
Four breeds of sheep, in the illustrated encyclopedia Meyers Konversationslexikon. This is a list of breeds of domestic sheep. Domestic sheep (Ovis aries) are partially derived from mouflon (Ovis gmelini) stock, and have diverged sufficiently to be considered a different species. Some sheep breeds have a hair coat and are known as haired sheep.
Suffolks are a medium wool, black-faced breed of meat sheep that make up 60% of the sheep population in the U.S. [24] Depending on breed, sheep show a range of heights and weights. Their rate of growth and mature weight is a heritable trait that is often selected for in breeding. [24]
This is a list of sheep breeds usually considered to originate in Canada and the United States. [1] [2] Some may have complex or obscure histories, so inclusion here does not necessarily imply that a breed is predominantly or exclusively from those countries.
The Finnish Landrace, Finn or Finnsheep is a breed of domestic sheep native to Finland. It is one of several Northern European short-tailed sheep breeds, but is notable for its high incidence of multiple births – it is common for a ewe to have three, four, or even five lambs at once. The lambs are often small, but are vigorous at birth and ...
The Polypay sheep breed is a white, medium-sized (65 kg), polled sheep which was developed in the 1960s at the U.S. Sheep Experiment Station in Dubois, Idaho. [1] In general, Polypay sheep are noted for being a highly prolific maternal dual-purpose (meat and wool) breed. It produces yearly about 4.2 kg of wool and is weaned at 120 days. [2] [3]
Wiltipoll sheep (polled Wiltshire Horn) shed their wool annually in spring to summer and produce lean, heavy lambs. They are a polled breed (no horns) bred for the production of prime lamb. The wool is simply shed and falls to the ground. [2] Due to this process, the energy of the sheep is directed into meat and milk, not wool.