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Damage to the acini therefore produces altered milk with abnormal levels of some constituents. During involution, the acini stop secretion and shrink with desquamation of cells, hence why there is an increase in cell number in the milk at the end of lactation.
 
Damage to the acini therefore produces altered milk with abnormal levels of some constituents. During involution, the acini stop secretion and shrink with desquamation of cells, hence why there is an increase in cell number in the milk at the end of lactation.
 
*'''Dry period''': the udder comproses ducts, contracted inactive acini and fat, the latter depends on the age of the animal. Damage during lactation tends to produce ductal epithelia hyperplasia with acinar necrosis or degeneration i.e. only ducts regenerate. The organ as a whole can undergo regeneration but only under hormonal control at the next pregnancy.  
 
*'''Dry period''': the udder comproses ducts, contracted inactive acini and fat, the latter depends on the age of the animal. Damage during lactation tends to produce ductal epithelia hyperplasia with acinar necrosis or degeneration i.e. only ducts regenerate. The organ as a whole can undergo regeneration but only under hormonal control at the next pregnancy.  
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Information by permission of Professor RW Else
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[[Category:Female Reproduction]]
 
[[Category:Female Reproduction]]
 
[[Category:Integumentary System - Anatomy & Physiology]]
 
[[Category:Integumentary System - Anatomy & Physiology]]
 
[[Category:To Do - A&P]]
 
[[Category:To Do - A&P]]
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