i
ad. Blood Substance _ _ _
. , • Identical tw1n cows used 111
`•~A`
A _       study to determine effect of adding ·
l F E t• materials into blood stream
" I°0II1 3 1Il
·»·a- g
2.
V By DON DOWDEN and DON R. JACOBSON ruminants are absorbed to some extent as glucose
*2* D"’""""’ll'"‘ llf D”l'y S”l”"”” and, to a much greater degree, as volatile fatty acids.
l . . . _ _
The Substance either acetic Or Pmpiouic acid is Volatile fatty acids are {produced El the rumen féom
___ normally produced in the cow’s rumen a11d is ab- lh? br€°‘k`dOwn_°f °“lb°l;Y‘ rites, {126 rilmeu ac`
F sorbed into the blood stream as an energy source. term ODE pisslbléwiy liwucbt el Gccmg cwtc} »
··~e» Except for this observation, very little is known about may he will hllhd     Cfniis lll lla amount" 0
i_ the processes through which food intake is regulated gluC0S€_0r att?] acl S m tw OOD _
" in the dairy COW. Identical twin cows were employed in a ·study
A _ , at the Kentucky Agricultural Experiment Station to
l Factors such as kind of pasture, temperature, . s .
. .. . . determine the efiect of adding several substances
. water availability and stage of maturity all affect lll- _ _ .
··v . . . . directly 1nto the blood stream. Glucose, SO(l1ll]ll
take but do little to explain how intake 1S regulated. . . . . .
g »,_ . . . . . acetate, and acetic, propiomc, butyric, caproic and lac-
" HOW thhshh ls Chhholhhl h hl Chhslhlslhhls llhhhlr is acids were i..-mi b    
- X, ance since economical animal productivity 1nay be _. . 1, ._ Hy . f
,. . , _ . dup to determine tien e ect upon consumption o
= nnitec by the amounts and kinds of feed consumed.
. cho 1 ned alfalfa ha . All of these substances, or
-,», . . . . 1 l Y
‘ \V0rk with laboratory annnals has mdicated that metabolites are ,,0,.,],,,,1,, found in the blood of
  there ls =l lwllllg Céhlsh lll lhs htm The lead- dairy Cows. In was ma one twin iecavai the
_` , mg Center ‘“aY_ mcclve l“€Ssa_g‘?S_ from other Parts metabolite under study in saline, and the other twin
W _ of the body which cause it to initiate the act ofeeat- mceivéd Saline Only. The injections were made fo,.
·""' lug Oh Cause the amulal lh Seek food _At Other `mws 8 hours on each of 3 consecutive days. The amounts
l »_a lt may mum the animal lh qmt eatmg of hay consumed were obtained daily and for the
A lllZ}.jOl` pO1`tlO1l of tl]€ diet of dairy COWS is IllB.Ll(‘ 8-hOul· injection P€I·iOdS_
up of carbohydrates. Carbohydrates in the diet of (C,,,,,,,,,,U,[ 0,, page 8)
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wa · L _ . .:,_    » r h — _ ..»;_  
i _-   .. ......      "m'   ‘‘=·i     '‘°` `   j' . {V
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’       ,,_v>   W "__,,_gtg€=i-=i;·a1‘,,::,,;,·.::,It  ‘.;,f     n   T, Y I _. ._ _ _ ` . _. _ ` _ . _ _ _.l
{    ·;» ._:       3 ,   ;. 3;;; IC C()\’\ OI] [lll. Ilglli lh l(.(.CI\ Illg d(.(,[lL tl(,l(
g  H ii  ...; 1 if-l ``‘h` ’ '‘-‘ 1   ·ii=¥     Q   V   ...t   in saline by constant drip into the blood
, {   i   _i'" I if ‘..._.._,     _,,_:,   »,f'     » V         stream at a rate approximately equal to that
»,     _·»,,°f     _   ‘*`: E       l]()l`l]lillly absorbed into the blood stream
,  Q- ,  I ·,   E   ~   _ l l . ' »   after a heavy meal. 'I`hough [lll! cow is hun-
 4* -  =‘ V ,,____,     ll  ‘ 2-};,     ,_,_,_, _ v_   4 _   gry, this material causes her to stop eating.
A  _y__1___i,_,, __ , . v —    ",!`§~ ;‘ m A    " '“*~·’i ~ °M °l iil _ _   -`   W,  The itlentieal twin malt: on (lll: lCi`l g0CS 011
    ._.,_ .__,,,,_     ,_,_  ,_       lf,  ··ii»=-·’ M ___, -  "_ ,_j°·¢°’,;V, eating as though unbothered. She is receiv-
U all `‘‘i*i¢'. gill     '   ·-.. r ·’`i_        to   _. i P ` if ` A in r only saline. The 1ol tethvlene tubin r vis-
••. ,.   »· N   . i l {,4,..;; i f'   ,   . 5 ’ I ) ‘ fw
, ';  ···`  5 C   =     ...`‘°      ·  v  _,==··   .···_ · “'"° *     ible at the withcrs leads directly to the jugu-
   ,  .. A    _    ,  ~ a tm ’`’  . i ..   l‘.;.‘ ·¥     e . im vein.
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  :=-     »=·= .   — z. >4·    -· X., , J
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