Introduction and procedure
 Results and discussion
 Summary and literature cited

Group Title: Animal science mimeograph report - University of Florida Department of Animal Science ; no. AL1972-1
Title: Fat in the diet of guinea pigs
Full Citation
Permanent Link: http://ufdc.ufl.edu/UF00073039/00001
 Material Information
Title: Fat in the diet of guinea pigs
Series Title: Animal science mimeograph report
Physical Description: 3 leaves : ; 28 cm.
Language: English
Creator: Arrington, Lewis Robert, 1919-
Beaty, T. C
Ammerman, Clarence B
University of Florida -- Dept. of Animal Science
University of Florida -- Agricultural Experiment Station
Publisher: Florida Agricultural Experiment Station
Place of Publication: Gainesville Fla
Publication Date: 1972
Subject: Guinea pigs -- Feeding and feeds -- Florida   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
bibliography   ( marcgt )
non-fiction   ( marcgt )
Bibliography: Includes bibliographical references (leaf 3).
Statement of Responsibility: L.R. Arrington, T.C. Beaty, Jr. and C.B. Ammerman.
General Note: Caption title.
General Note: "February, 1972."
Funding: Animal Science Department mimeograph report ;
 Record Information
Bibliographic ID: UF00073039
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 79844501

Table of Contents
    Introduction and procedure
        Page 1
    Results and discussion
        Page 2
    Summary and literature cited
        Page 3
Full Text

Animal Science Florida Agricultural
Mimeograph Report No. AL 1972-1 Experiment Station
February, 1972 Gainesville, Florida

L. R. Arrington, T. C. Beaty, Jr. and C. B. Ammerman-

The dietary requirement for fat by the guinea pig is small, but a
source of unsaturated fatty acids or fat is required (1, 2, 3). Omission
of fat and the unsaturated fatty acids results in poor growth, dermatitis
and other symptoms of the deficiency. The studies haveshown that one
percent corn oil in the diet w permit good growth but will not pre-
vent dermatitis. Three percent ck~I oil prevents the dermatitis. Reports
of studies relating to toleran e of and response to higher levels of
dietary fat have not been obse ved. omsercial diets f r guinea pigs
normally contain 2.5 to 5.0 pe cent ether extract.

The purpose of the present Istudywap, o voluntary feed
intake, weight gain, fat digestibility andi i ~ ec o feed utilization
in growing guinea pigs fed prac ical diets containing up to 11.5 percent


Forty four weanling English-type guinea pigs averaging 240 grams
initial weight were used in the study. Animals were housed individually
and provided the experimental diets and tap water ad libitum. Voluntary
feed intake was determined and initial, weekly and terminal body weights
were taken for the 8-week experimental period. Efficiency of feed uti-
lization was calculated as feed to gain ratio or weight of feed required
per unit of body weight gain for the entire experimental period.

The basal diet was a commercial pelleted feed (Purina Guinea Pig
Chow) analyzed in this laboratory to contain 5.4 percent crude fat.
Two additional treatments were prepared by adding corn oil to provide
diets which analyzed 8.5 and 11.5 percent fat. In order to maintain
protein constant for the three treatments, casein was added in amounts
to compensate for decreased protein in the diets with added oil.

At the end of the experimental period, digestibility of the fat in
each diet was determined using the conventional digestion trial procedure.
Six animals from each treatment were confined to metabolism cages and
total fecal collections were made for either 5 or 7 days.

SArrington and Ammerman, Animal Nutritionists; Beaty, Laboratory
Technician II.


Fat determinations were made by ether extraction using the Goldfisch
apparatus. Differences in treatment means were tested for significance
by analysis of variance.

Results and Discussion

The young guinea pigs readily consumed the diets with added fat
and appeared normal throughout the experimental period. Voluntary
feed intake was reduced, but weight gain was not affected except in
females on one treatment (Table 1). Females consuming the diet with
11.5 percent fat gained significantly more than those on the basal
diet (5.4 percent fat).

Table 1

Effects of Dietary Fat Upon Feed Intake, Gain,
Feed Conversion and Fat Digestion in Guinea Pigs

Dietary No. Daily Daily Fat
fat, % animals Sex feed, gm gain, gm* F/G* digestion, %*

7 M 34.1 8.8 3.9a
5.4 8 F 30.9 6.6a 4.6a
15 M & F 32.4 7.7 4.2ax 76.5x

7 M 31.9 8.4 3.7ax
8.2 7 F 28.3 7.0 4.0b
14 M & F 30.1 7.7 3.9ay 79.2xy

8 M 29.8 8.8 3.4by
11.5 6 F 29.0 7.7b 3.8b
14 M & F 29.4 8.3 3.6b 85.0y

Means with different superscript

letters (a,b) within

icantly different at .01 level; different superscript
are different at .05 level.

sex are signif-
letters (x,y)

Efficiency of feed utilization was significantly improved in both
sexes with the highest fat level. At the intermediate level, feed con-
version in the famales was also improved.

Digestibility of the fat in diets with added oil appeared to be in-
creased over the basal ration. Variations among animals were great and
a significant (P<0.05) improvement was observed only with the highest
level of added oil.

- 3-

All diets contained more than 20 percent protein which is reported
(1) to be adequate for the growing guinea pig. With the reduced intake
of diets containing added oil, there was a slight reduction in calculated
gross energy intake even though dietary energy concentration was greater.
Since digestion of fat in the latter diets was increased, digestible
energy was estimated to be essentially equal.

The results indicate that growing guinea pigs are able to utilize
effectively diets containing at least 11.5 percent fat. Since growth
was not consistently improved with diets containing more than about 5
percent fat, it appears that the value of increased dietary fat should
be related to the relative cost of supplying energy as fat or carbohy-


Weanling guinea pigs were fed practical diets containing 5.4, 8.5,
and 11.5 percent fat. Voluntary intake of the diets with added fat was
reduced but weight gain was not consistently affected. Efficiency of
feed utilization was improved and fat digestion appeared to be increased
with the higher levels of dietary fat.

Literature Cited

1. National Research Council. 1962. Nutrient Requirements of
Laboratory Animals. Publication 990. National Research Council -
National Academy of Science, Washington, D. C.

2. Reid, M. E. 1954. Production and Counteraction of a Fatty Acid
in the Guinea Pig. Proc. Soc. Exp. Biol. Med. 86: 708-709.

3. Reid, M. E. 1958. The Guinea Pig in Research. Human Factors Re-
search Bureau, Inc. Washington, D. C.

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