Copyright is owned by the Author of the thesis. Permission is given for a copy to be downloaded by an individual for the purpose of research and private study only. The thesis may not be reproduced elsewhere without the permission of the Author.
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N AIJHICULTUR.U. COW.Eii AARY AALMERaTeN NOil)i.H, """"'
0 B S E R V A T I 0 N S
0 N
R U .M I N A N T FAT M E T A B 0 L I S M W I T H
P A R T I C U L A R R E L A T I 0 N
T 0
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L A C T A T I 0 N
by
J.W.MAYHEAD
...
1949
A thesis ~resented in partial fulfilment of the requirements for
the Degree of M.Agr.sc. of the University of New Zealand •
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I. Introductory.
X
NA&SI!Y AIJRICULTURAL COU.
~'[ ...,.._., IOR.BTWl'l Hgl~'i, ~
1,
II. Tpe Jranet2r of Fat from the Ali~ent~~Y
Canal into the Bloodetreem.
FJtazer•s Hypotbea1e of Particulate Fat Absorption.
III. General ~-""----"--·-"·-~ Review ot Ll terat'ure. ~
"'l'h! Source of MJ.lk Fat in the Ruminant."
3.
1·
1. The Relation of Pood Fat to Milk Fat. 12.
2. The Relation of Non-Lipid Preour$ors
to Milk Fat. 26.
3. The Relation ot Depot Pat to Uilk Fat.
36.
4.
'J.'he Inter-Relationship of Milk FatPrecursors.
40.
IV. Particular Review of Literature and Aims of Exper1rnente Undertaken.
Experiment 1 :•
The i:tteote o-r Feeding an Unsaturated 011 to Dairy Cows on the Btttter:f"at
Produced. 51.
~xper1ment2 : ...
The i?fecte ot Inanition on the Degree of Unsaturation of Milk Fat Secreted
by Dairy Cows. 58t
Experiment 3 s-
Tfie Etfecte of Inanition during the Feeding ot Unsaturated Oila to Dairy COws on the Degree ot Unsaturat1on of the Milk Fat Secreted.
Experiment 4 t-
62.
The Effects ot Feeding Stained. Fate
to Simple-Stomached Animals.
64.
Experiment
2
~-Tne Relation of the Degree of Uneaturation ot Butterfat to 1 te Keepi.ng Qualities. 67.
v.
Experimental Proeedu~~ ,_x2er1ment 1. ·
'Materiel ond MethOde •
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, Results.Diecuee1on of Results
SUD'lZtlary
£?9.
72.
75·
83.
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Experiment~l Procedure (continued)VI.
VII.
S!Periment 2:.
aterial end MethOde.
Reeul ts.
Discussion o~ Reaulta
SUDl1118l'7
Bx2er1ment 3.
aterial and Methods.
Result&
Discussion ot ResUlts
SUDJDIJ.r)'
Exper1men t .
i•.
84.
86.
88.
92.
9.}.
93·
95·
96.
100.
Procedure and Results 101.
Dieeuseion ot Reeulte, and summary. 102.
eterial and MethOd. 103~
Results. 104.
D1scuesion of Results. 105.
Summary. 106.
l!ibliOS£8~ ' 107.
Alu~en4icee. ·112 •.
I· The Determination ot Iodine Value 112.
II. Expe~iment 1. Individual Iodine
Values. 114.
Ill. EXperiment 1. Individual Kilk
Weights. 116.
rv.
EXperiment 1. Analysis of varianceot lod1ne Values. 118.
v.
Photographs Illustrating Laboratory Procedure and Equipment tor'3xperimen ta 1 , 2, and ,3. 125.
VI. Experiment 2. Individual Iodine
~ Values. 129.
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VII. Experiment 2 .. Individual Milk Weighte 130.
VIII. Experiment
3.
Ind1v1d. Iodine Values. 131.IX. Experiment ' 3. l~d1v1dual Milk Weights 132 • X. Experiment ;. Photograp~Fat Samples 1.33·
