The fibers are made up of keratin, which grows from skin of an animal and they are used for protection of animal skin from abrasions and also keep the body temperature of animal in a stable manner. These fibers have economical values, because they are used for making of several fabrics that are suitable for the usage of humans.
Animal's that have hair as a converging on the body includes pigs, cattle's, pigs, horses and dairy goats. Animal's that have fur as a converging on the body includes non-angora rabbits and mink. The mohair is present on the skin of angora goats and the sheep's have Wool.
The sheep's are the animals that produce wool. The two major factors that control or affect the production of wool are breeding and diet of sheep. If the sheep has low breeding capability and feed with diet contains less than 8% of protein, then it produces low quality fleeces. However, sometimes the fleeces would be mixed with farm dust like vegetable matter, like grass seeds, prickly seeds, etc.
The major types of undesirable fleeces are burry, chaffy and cotted. The burry fleeces have vegetable matter, like grass seeds, prickly seeds, etc and they binds persistently to the wool fibers. The chaff has vegetable materials like grass, hay and straw, etc. The cotted has entangled and matted fibers.
The major characteristics or primary traits that add value to the wool fleeces are yield, crimp, fiber diameter, purity, color, strength and staple length. The undesirable fleeces have high variation in the diameter of fiber and the diameter of fiber also affects the crimp nature.
So, irregularity in the diameter results production of coarser wools. The fleece must have bulky nature; if it does not possess bulky nature then it is an undesirable fleece. Long length fleece are more value than the shorter length fibers.