In a message dated 1/11/03 4:54:47 PM Eastern Standard Time,
[log in to unmask] writes:


> Is this true with milking cows also?

Yes!  This triggerered some nebulous memories from dairy science classes.

I have distinct memories of higher fat content in hand-milked cows vs machine
milked cows.  I have to hunt for some references.

Here are two interesting studies from a quick medline search:

<A HREF="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=1560139&dopt=Abstract">Gorewit RC, Svennersten K, Butler WR, Uvnas-Moberg K.</A>   Endocrine responses
in cows milked by hand and machine. J Dairy Sci. 1992 Feb;75(2):443-8.
"Our data show that hand-milking results in a pronounced and prolonged
release of oxytocin and prolactin."

<A HREF="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=2345207&dopt=Abstract">Svennersten K, Claesson CO, Nelson L.</A>   Effect of local stimulation of one
quarter on milk production and milk components. J Dairy Sci. 1990
Apr;73(4):970-4.
"an increased production in the hand-milked quarter."

And while reading, I came across this little gem in a study about induced
lactation:

"While it is unlikely that hormonal induction of lactation in prepubertal
heifers is practical from a dairy production viewpoint, the advent of
biotechnology for production of therapeutic recombinant proteins in the
mammary gland of transgenic livestock has made early detection of these
transgenic proteins very desirable. We conclude that induction of lactation
in prepubertal heifers is a viable technique for testing the expression of
mammary-linked gene constructs in transgenic cattle."

Karen Seroussi BS (Animal Science), IBCLC




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