The musculoskeletal system (see Introduction to the Biology of the Musculoskeletal System) includes the bones, muscles, ligaments, tendons, and joints, which support and move the body.
Lambing. Ewes generally lamb around 145 days after mating. Some of course will be earlier & some later, but 145 days is the norm. For a successful lambing, ewes need to receive good nutrition, particularly in the last month of pregnancy when the lamb will approximately double in size.
The average gestation period of a sheep is 147 days, but it can range from 138 to 159. There are breed differences in gestation length, so breeds that mature earlier will have shorter pregnancies than later maturing breeds. If the ewe is pregnant with more than one lamb, they will also tend to have a shorter pregnancy.