Learning Reproduction in Farm Animals

12-Lactation


Learning Objectives:

Anatomy of the Mammary Gland

Comparison of Colostrum to True Milk
Composition of colostrum and milk of holstein cow 
Constituent 
Colostrum 
(%)
2nd and 3rd Day 
Milk-Colostrum 
(%) 
Milk 
(%)
Fat 
6.0
3.5
3.5
Nonfat solids 
22.3
12.5
8.8
Protein 
18.8
7.5 
3.3
Immune globulins 
13.1 
1.0 
0.1
Lactose 
2.5
4.0
4.6
  True Milk Production:  
Blood precursors of the milk constituents in the ruminant. 
Milk constituent  Blood Precursor 
Water  Water
Lactose  Glucose
Protein 
    Casein 
Amino Acids
    ß-Lactoglobulin 
Amino Acids 
    a-lactalbumin 
Amino Acids
    Milk serum albumin 
Blood serum albumin
    Immune globulins 
Immune globulins
Fat
    Fatty acids 
Acetate, ß-hydroxybutyrate, blood lipids
    Glycerol 
Glucose, Glycerol from triglycerides
Minerals  Minerals
Vitamins  Vitamins 
 

Maintenance of Milk Production:

Problems with milk let down:

Fear or Stress


Illustrated Notes

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