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Group Title: Mimeo series - University of Florida Range Cattle Experiment Station ; RCS 68-4
Title: Our observations with Melengestrol acetate (MGA) for heifers
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Permanent Link: http://ufdc.ufl.edu/UF00074328/00001
 Material Information
Title: Our observations with Melengestrol acetate (MGA) for heifers
Series Title: Mimeo series
Physical Description: 2 p. : ; 28 cm.
Language: English
Creator: Chapman, H. L ( Herbert L. ), 1923-
Range Cattle Experiment Station
Publisher: Range Cattle Experiment Station
Place of Publication: Ona FL
Publication Date: 1968
 Subjects
Subject: Heifers -- Feeding and feeds -- Florida   ( lcsh )
Hormones in animal nutrition   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
non-fiction   ( marcgt )
 Notes
Statement of Responsibility: H.L. Chapman, Jr.
General Note: Caption title.
General Note: "May 1968."
Funding: Mimeo report (Range Cattle Experiment Station) ;
 Record Information
Bibliographic ID: UF00074328
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 86110536

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Mimeo Series RCS 68-4 May!9uLj E LI0 .
OUR OBSERVATIONS WITH IMEENGESTRQL
ACETATE (MGA) FOR HSEIfRS-2/ 16 13
NIAY 18 1968
H. L. Chapman, Jr.-
S.A.S. Uni. of Fior: d
Melengestrol acetate (MGA) is a synthetic female hormbne-that---'--'

number of experiment stations have demonstrated to stimulate rate-of gain and

feed efficiency of feedlot heifers. The majority of earlier reports have

been with English-type heifers. The purpose of this experiment was to

determine if MGA affected growth, feed utilization or carcass characteristics

of crossbred heifers being fattened in drylot and.to determine if

diethylstilbestrol (DES) altered the effect.

Forty-five Brahman-crossbred heifers of approximately 10 months of age,

were divided into three equal groups on the basis of weight and quality and

allotted to the following experimental design:

Treatment
number Treatment description
1 Control
2 0.4 mg MGA/head/daily
3 0.4 mg MGA/head/day + 24 mg DES implanted at
the beginning of the experiment.

The experimental ration was comprised of 40% dried citrus pulp, -

27% hominy feed, 10% cottonseed meal (41%), 5% dehydrated' alfalfa
meal (17%), 15% cottonseed hulls, 1% urea-262, 1.5% dicalcium phosphate

and 0.5% trace mineralized salt. Vitamin A was added to the ration at

the level of 1,000 I.U. per pound of feed.


/ Presented at 1968 Beef Cattle Short Course, University of Florida.
SPhysiological studies were made by A. C. Warnick and carcass
evaluations by A. Z. Palmer and J. W. Carpenter.
2/ Grateful acknowledgement is made to TUCO Products Co., Division of
Upjohn Co., Kalamazoo, Michigan for their financial support of this
study.
_/ Animal Nutritionist and Head, Range Cattle Experiment Station.'









At the conclusion of a 151-day feeding period the heifers were

transported to Gainesville for carcass studies. The experimental

results are listed below:


Control


No. animals
Initial weight (lb)
Final weight (lb)
Total gain (lb)
Daily gain (lb)
Gainesville weight (lb)
Intransit shrink (%)1/
Percent hide
Warm carcass weight (lb)
Chilled carcass weight (lb)
Cooler shrink (%)
Dressing %2/
Li'ver weight (lb)
Percent liver
USDA grade
Fat over rib-eye (in)
Percent kidney
Rib-eye area (sq.in.)
Est. % yield
Right ovary wt. .(m).
Ni. active CL2/
Size largest follicle (mm)
Nop!. .follicles over 5 mm
Left ovary wt. (gm)
No.. active CL
Size largest follicle (mm)
No. follicles over, 5 mm
Uterine weights (gm)
Feed/lb gain


15.
480
799
319
2.11
764
4.6
8.7
479
470
1.9
61.49
11.2
1.5
G
0.33
3.4
&.84
S50.04
7.3
7
10.5
2.9
6.1
4
7.5
2.0
104.9
9.30


MGA MGA + DES


14
482
809
327
2.17
774
4.3
8.9
481
471
2.0
60.85
11.0
1.4
G
0.40
3.2
8.45
49.41
7.0
0
14.1
3.3
5.4
0
13.4
2.2
127.5
9.32


15
475
825
350
2.32
772
6.4
8.9
' 82
472
1.9
61.13
11.2
1.4
G .
0.35
3.1
.8.80
49.99
7.3
1
13.7
3.0
5.2
0
-9.5
2.5
131.6
8.72


1/ Intransit distance was 180 miles.
SDressing percent = chilled carcass weight
Gainesville weight
3/ CL = corpus luteum.


RCS68-4
750 copies









HISTORIC NOTE


The publications in this collection do
not reflect current scientific knowledge
or recommendations. These texts
represent the historic publishing
record of the Institute for Food and
Agricultural Sciences and should be
used only to trace the historic work of
the Institute and its staff. Current IFAS
research may be found on the
Electronic Data Information Source
(EDIS)

site maintained by the Florida
Cooperative Extension Service.






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