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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]
The length of gestation, called the gestation period, varies greatly from species to species; it is 40 weeks in humans, 56–60 in giraffes and 16 days in hamsters. Birth [ edit ]
Gestation is the period of development during the carrying of an embryo, and later fetus, inside viviparous animals (the embryo develops within the parent). [1] It is typical for mammals , but also occurs for some non-mammals.
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]
The California Red is a medium-size sheep, with rams weighing between 180 and 250 pounds (82 and 113 kg) [5] and ewes between 130 and 140 pounds (59 and 64 kg). [5] They have a bold, strong expression framed by a chiseled muzzle and long, pendulous ears. [2]
Depending mostly on the amount of yolk in the egg, the cleavage can be holoblastic (total) or meroblastic (partial). [8] [9] Holoblastic cleavage occurs in animals with little yolk in their eggs, [10] such as humans and other mammals who receive nourishment as embryos from the mother, via the placenta or milk, such as might be secreted from a ...
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 ...