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Milk Composition and Biosynthesis- Anatomy & Physiology (view source)
Revision as of 10:47, 30 July 2008
, 10:47, 30 July 2008→Synthesis of the Fat Component
== Synthesis of the Fat Component ==
== Synthesis of the Fat Component ==
[[Image:Milk Fat and Protein Synthesis.jpg|thumb|right|150px|Milk Fat and Protein Synthesis,Copyright RVC 2008]]
The mammary gland synthesises triacylglycerol from glycerol and three fatty acids. The fatty acids originate from triacyclglycerol in plasma lipoproteins (60%) or from synthesis in the mammary gland (40%).
The mammary gland synthesises triacylglycerol from glycerol and three fatty acids. The fatty acids originate from triacyclglycerol in plasma lipoproteins (60%) or from synthesis in the mammary gland (40%).
3. In '''ruminants''', the enzyme citrate lyase is lacking, so Acetyl CoA from glucose metabolism cannot be used for fatty acid synthesis. However, they have an abundant supply of '''acetate, butyrate and β hydroxybutyrate''' from the digestion of carbohydrate in the rumen. These are therefore used as the precursors for the synthesis of acyl CoA. '''Acyl CoA''' and '''gylcerol-3-phosphate''' then combine to form triacylglycerol.
3. In '''ruminants''', the enzyme citrate lyase is lacking, so Acetyl CoA from glucose metabolism cannot be used for fatty acid synthesis. However, they have an abundant supply of '''acetate, butyrate and β hydroxybutyrate''' from the digestion of carbohydrate in the rumen. These are therefore used as the precursors for the synthesis of acyl CoA. '''Acyl CoA''' and '''gylcerol-3-phosphate''' then combine to form triacylglycerol.
== Synthesis of Protein ==
== Synthesis of Protein ==