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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]
The Artiodactyla have a cotyledonary placenta. In this form of placenta, the chorionic villi form a number of separate circular structures (cotyledons) which are distributed over the surface of the chorionic sac. Sheep, goats and cattle have between 72 and 125 cotyledons whereas deer have 4-6 larger cotyledons. [1] [2]
At least three companies currently [when?] sell hair or skin treatments which contain extracts of animal placenta. [1] The most common type of placenta used is sheep. The placental extract allegedly serves as a source of protein and hormones, predominantly estrogen and progesterone, in the cosmetics in which it is used.
A typical precocial mammal has a gestation period almost four times longer than a typical altricial mammal of the same body size. [20] Precocial mammal species generally have greater adult body weights than altricial mammals as precocial mammals have markedly longer gestation periods than altricial mammals. [ 21 ]
Pregnant male seahorse. Male pregnancy is the incubation of one or more embryos or fetuses by organisms of the male sex in some species. Most species that reproduce by sexual reproduction are heterogamous—females producing larger gametes and males producing smaller gametes ().
Conflict over seed size arises because there usually exists an inverse exponential relationship between seed size and fitness, that is, the fitness of a seed increases at a diminishing rate with resource investment but the fitness of the maternal parent has an optimum, as demonstrated by Smith and Fretwell [4] (see also marginal value theorem).
The placenta has high protein, rich iron and nutrient content, but there is inconclusive scientific evidence about any health benefit to its consumption. [5] The risks of human placentophagy are also still unclear, [ 6 ] but there has been one confirmed case of an infant needing hospitalization due to a group B strep blood infection tied to ...
Living with Sheep: Everything You Need to Know to Raise Your Own Flock. Geoff Hansen (Photography). Guilford, Connecticut: The Lyons Press. ISBN 978-1-59228-531-0. Hussain, Aftab; Fakeha Affaf (2011). Composition of fatty acids: Physicochemical studies on sheep fat. Saarbrücken, Germany: VDM verlag. ISBN 978-3-639-35780-6.