Lecture 4- Wool Flashcards
Where is wool mostly produced?
China + Australia
Where is mohair mostly produced?
South Africa + Texas
How many primary follicles are always in a group?
3
When do primary follicles emerge?
At birth (w/ accessory structures)
When do secondary follicles emerge?
1-3 weeks old
Where are secondary follicles located?
Associated w/ primary follicles
2 factors that affect follicle development
Prenatal environment + early postnatal environment
Which fiber type do consumers prefer?
Secondary
Orthocortex cells are
Soft + elastic needle-like cells
Paracortex cells are
Hard + less elastic needle-like cells
Medulla
Hollow air space (absent in fine wools)
Kemp
Large fibers w/ solid core
What 2 accessory structures do secondary follicles lack?
Sweat gland and Arrector muscle
Keratin building block is
Long flexible peptides held in helical shape by disulfide bonds
What 2 amino acids have sulfur?
Methionine and Cysteine
Fleece
Wool from a single sheep
Clip
Amt. of wool from a flock of sheep
Grease wool
Wool before natural impurities removed
Where is lanolin (grease) produced?
In sebaceous gland
Sweat glands produce ___
Suint
The wool yolk is made up of
Grease + suint
3 types of impurities
Natural
Acquired
Applied
Most impurity removal is done by ____.
Scouring; using a soapy solution
The 2nd method to remove impurities is _____.
Carbonizing; use acid to remove organic matter
