• TABLE OF CONTENTS
HIDE
 Introduction
 Procedure
 Results and discussion
 Acknowledgement






Group Title: Mimeo report - North Florida Experiment Station, University of Florida - 57-10
Title: Stilbestrol in feed, stilbestrol implants and progesterone estradiol implants for fattening steers
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Permanent Link: http://ufdc.ufl.edu/UF00073275/00001
 Material Information
Title: Stilbestrol in feed, stilbestrol implants and progesterone estradiol implants for fattening steers
Series Title: NFES mimeo rpt.
Physical Description: 4 leaves : ; 28 cm.
Language: English
Creator: Baker, F. S ( Frank Sloan ), 1921-
North Florida Experiment Station
Publisher: North Florida Experiment Station
Place of Publication: Quincy Fla
Publication Date: 1957
 Subjects
Subject: Beef cattle -- Feeding and feeds -- Florida   ( lcsh )
Beef cattle -- Growth -- Florida   ( lcsh )
Diethylstilbestrol   ( lcsh )
Estradiol   ( lcsh )
Progesterone   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
non-fiction   ( marcgt )
 Notes
Statement of Responsibility: by F.S. Baker, Jr.
General Note: Caption title.
General Note: "May 24, 1957."
Funding: Florida Historical Agriculture and Rural Life
 Record Information
Bibliographic ID: UF00073275
Volume ID: VID00001
Source Institution: Marston Science Library, George A. Smathers Libraries, University of Florida
Holding Location: Florida Agricultural Experiment Station, Florida Cooperative Extension Service, Florida Department of Agriculture and Consumer Services, and the Engineering and Industrial Experiment Station; Institute for Food and Agricultural Services (IFAS), University of Florida
Rights Management: All rights reserved, Board of Trustees of the University of Florida
Resource Identifier: oclc - 82370498

Table of Contents
    Introduction
        Page 1
    Procedure
        Page 2
    Results and discussion
        Page 2
        Page 3
    Acknowledgement
        Page 4
Full Text


S' ~NORTH FLORIDA EXPERIMENT STATION
QUINCY, FLORIDA
May 24, 1957
NFES Mimeo Rpt. 57-10
STILBESTROL IN FEED, STILBESTROL IMPLANTS AND PROGESE
ESTRADIOL IMPLANTS FOR FATTENING STEERS

By F. S. Baker, Jr.
Steers fed 10 mg. stilbestrol per head daily gained 11.5 percent (0.24
lb. per head daily) faster, yielded heavier carcasses, and made slightly cheaper
gains ($0.77 per 100 pounds gain) than control cattle that did not receive stil-
bestrol. Carcass grade apparently was not affected by stilbestrol feeding.

Steers implanted in the ear with stilbestrol gained 11.5 to 17.0 percent
faster, yielded heavier carcasses, and made more economical gains than the non-
stilbestrol controls ($1.46 to $2.44 per 100 pounds gain). Carcasses of cattle
implanted with 36 or 48 mg. stilbestrol graded slightly lower than those from the
controls that did not get stilbestrol. Carcasses of steers implanted with 24 mg.
stilbestrol graded as high as those from the non-stilbestrol control cattle.
Gains made by stilbestrol-fed and stilbestrol-implanted (24, 36, and 48 mg.) cattle
were similar.

In this one trial, a 1,000 mg. progesterone-20 mg. estradiol implant gave
27 percent faster steer gain than no treatment, 14 percent more gain than stilbestrol
feeding, and 11 percent more gain than stilbestrol implants. The progesterone-
estradiol (Synovex) implant reduced cost of gain $2.60, $1.83, and $0.73 when
compared with the respective costs of 100 pounds gain made by the control, stilbestro:
fed, and stilbestrol implanted groups. Carcass grades did not differ greatly between
the Synovex- and stilbestrol-implanted groups.

Based on the results of this and a preceding trial, an implant of either
24 or 36 mg. stilbestrol at the beginning of the fattening period is recommended.


INTRODUCTION
A review of literature on implantation and oral administration of
diethylstilbestrol (hereafter referred to as stilbestrol) was included in a previous
report1. In a preceding trial at the North Florida Station, fattening steers
implanted in the ear with stilbestrol pellets gained gaster, yielded heavier
carcasses, and made more economical gains than the non-stilbestrol controls1.
Steers implanted with stilbestrol gained slightly faster, yielded heavier carcasses,
and made cheaper gains than stilbestrol-fed steers. There did not appear to be
any difference in carcass grade or marbling in the eye muscle between the control
group and either those implanted or those fed stilbestrol.

In a fattening experiment at the Michigan Station, steers implanted with
1,500 mg. progesterone and 50 mg. estradiol gained faster than either the non-treated
controls or cattle fed 10 mg. stilbestrol per head daily.2 Carcasses from the
progesterone-estradiol steers were slightly leaner.

1/ Baker, F. S., Jr., NFES Mimeo Rpt. 57-5, 1956.
2/ Deans, R. J., W. J. Van Arsdell, E. P. Reinke, and L. J. Bratzler. 1956. The
Effects of Hormone Implants and Hormone Feeding on Steers. Mich. Agr. Exp. Sta.
Mimeo Rpt. AH. 5.






NFES 56-10 cont'd.


PROCEDURE

A steer fattening trial to determine the comparative value of various low
level stilbestrol implants, stilbestrol in the feed, and progesterone-estradiol
(Synovex) implants was conducted.

Fifty-six good quality Hereford, Angus, and crossbred feeder steers were
purchased in Jackson County, trucked to Quincy, and divided into seven approximately
equal groups. All groups were confined to dry lot and fed a fattening ration composer
of ground snapped corn, citrus molasses, cottonseed meal, Coastal Bermuda grass hay,
and minerals. Citrus molasses was limited to 5.0 pounds, and 41% cottonseed meal
was fed at the rate of 2.5 pounds per head daily. All the ground snapped corn
was supplied that the cattle would clean-up in addition to the molasses and
cottonseed meal. Hay was self-fed, and free access was given to salt and steamed
bonemeal.

Followingwere the various treatments in this trial:

Lot 1 Control.
Lot 2 10 mg. stilbestrol per head daily in feed.
Lot 3 24 mg. stilbestrol implant.
Lot 4 36 mg. stilbestrol implant.
Lot 5 48 mg. stilbestrol implant.
Lot 6 36 mg. stilbestrol implant (24 mg. at beginning of trial,
12 mg. later)
Lot 7 1,000 mg. progesterone-20 mg. estradiol (Synovex) implant.

All implants were made beneath the skin on the back of the ear.

When the trial was completed, the steers were trucked to Quincy in the
morning, weighed, and this weight was shrunk 3 percent to obtain the final weight
resulting in 4 to 5 percent actual shrink from feedlot weights). This one final
weight was used in calculating gains and also dressing percentages. The initial
weight at the beginning of the trial was a gross weight and was not shrunk.

RESULTS AND DISCUSSION

Results of the fattening trial are presented in Table 1-580.

Oral feeding of stilbestrol (Lot 2) resulted in 11.5 percent (0.24 lb. per
head daily) faster gains and 26 pound heavier carcasses with a slight reduction in
feed cost per 100 pounds gain ($0.77), when compared with the non-stilbestrol
control group (Lot 1). Carcass grades were apparently not affected by stilbestrol
feeding. These results are similar to the average obtained in three previous
trials conducted at the North Florida Station.3

Steers implanted in the ear with stilbestrol (Lots 3, 4, 5, and 6)
gained 11.5 to 17.0 percent (0.24 to 0.35 lb. per head daily) faster, yielded
24 to 40-pound heavier carcasses, and ate $1.46 to $2.44 less feed per 100 pounds
gain than cattle that did not receive stilbestrol (Lot 1). Two of the implanted
groups (Lot 4 with 36 mg. and Lot 5 with 48 mg. implants) had slightly lower
carcass grades, but the apparent reduction was not great. The 24 mg. implant
(Lot 3) gave similar carcass grades to the non-stilbestrol control (Lot 1).

3/ See footnote 1, page 1.






NFES 56-10 cont'd.


PROCEDURE

A steer fattening trial to determine the comparative value of various low
level stilbestrol implants, stilbestrol in the feed, and progesterone-estradiol
(Synovex) implants was conducted.

Fifty-six good quality Hereford, Angus, and crossbred feeder steers were
purchased in Jackson County, trucked to Quincy, and divided into seven approximately
equal groups. All groups were confined to dry lot and fed a fattening ration composer
of ground snapped corn, citrus molasses, cottonseed meal, Coastal Bermuda grass hay,
and minerals. Citrus molasses was limited to 5.0 pounds, and 41% cottonseed meal
was fed at the rate of 2.5 pounds per head daily. All the ground snapped corn
was supplied that the cattle would clean-up in addition to the molasses and
cottonseed meal. Hay was self-fed, and free access was given to salt and steamed
bonemeal.

Followingwere the various treatments in this trial:

Lot 1 Control.
Lot 2 10 mg. stilbestrol per head daily in feed.
Lot 3 24 mg. stilbestrol implant.
Lot 4 36 mg. stilbestrol implant.
Lot 5 48 mg. stilbestrol implant.
Lot 6 36 mg. stilbestrol implant (24 mg. at beginning of trial,
12 mg. later)
Lot 7 1,000 mg. progesterone-20 mg. estradiol (Synovex) implant.

All implants were made beneath the skin on the back of the ear.

When the trial was completed, the steers were trucked to Quincy in the
morning, weighed, and this weight was shrunk 3 percent to obtain the final weight
resulting in 4 to 5 percent actual shrink from feedlot weights). This one final
weight was used in calculating gains and also dressing percentages. The initial
weight at the beginning of the trial was a gross weight and was not shrunk.

RESULTS AND DISCUSSION

Results of the fattening trial are presented in Table 1-580.

Oral feeding of stilbestrol (Lot 2) resulted in 11.5 percent (0.24 lb. per
head daily) faster gains and 26 pound heavier carcasses with a slight reduction in
feed cost per 100 pounds gain ($0.77), when compared with the non-stilbestrol
control group (Lot 1). Carcass grades were apparently not affected by stilbestrol
feeding. These results are similar to the average obtained in three previous
trials conducted at the North Florida Station.3

Steers implanted in the ear with stilbestrol (Lots 3, 4, 5, and 6)
gained 11.5 to 17.0 percent (0.24 to 0.35 lb. per head daily) faster, yielded
24 to 40-pound heavier carcasses, and ate $1.46 to $2.44 less feed per 100 pounds
gain than cattle that did not receive stilbestrol (Lot 1). Two of the implanted
groups (Lot 4 with 36 mg. and Lot 5 with 48 mg. implants) had slightly lower
carcass grades, but the apparent reduction was not great. The 24 mg. implant
(Lot 3) gave similar carcass grades to the non-stilbestrol control (Lot 1).

3/ See footnote 1, page 1.







NORTH FLORIDA EXPERIMENT STATION
QUINCY, FLORIDA
Table 1-580. Results fattening trial with stilbestrol in feed, various stilbestrol implants, and progesterone-
estradiol implants.
: Control : 10 mg. : 24 mg. : 36 mg. : 48 mg. : 36 mg. :1,000 mg. pro-
:stilb. per : stilb. : stilb. : stilb. : stilb. :gesterone, 20
: :head daily : implant : implant : implant : implant :mg. estradiol
: : in feed : : :(2 implants): implant
Lot I Lot II Lot III Lot IV Lot V Lot VI Lot VII


Number steers
Number days
Average initial weight
Average final weight
Average gain
Average daily gain
Average carcass weight
Average carcass yield (%)
Carcass grades


8
116
753
996
243
2.09
601
60.41
high choice
ave. choice
low choice
high good
ave. good
low good


8
116
753
1023
270
2.33
627
61.30


low choice
high good
ave. good


8
116
754
1025
271
2.33
625
60.96
-----


low choice
high good
ave. good


8
116
753
1029
276
2.38
630
61.28


1 low choice
3 high good
4 ave. good


8
116
757
1040
283
2.44
641
61.69


low choice
high good
ave. good
low good


8
116
749
1028
280
2.41
631
61.38

ave. choice
low choice
high good
ave. good
low good


8
116
752
1059
307
2.65
647
61.12

ave. choice
low choice
high good
ave. good


Mkt. value cwt. carcasses* $ 36.23 $ 36.32 $ 36.52 $ 35.74 $ 36.00 $ 36.01 $ 36.00
Mkt..value cwt. on foot* 21.89 22.26 22.26 21.90 22.21 22.10 22.00
Average daily ration (pounds):
Ground snapped corn 16.96 18.22 37.66 18.09 17.91 18.64 18.72
Citrus molasses 4.74 4.74 4.74 4.74 4.74 4.74 4.74
41% cottonseed meal 2.45 2.45 2.45 2.45 2.45 2.45 2.45
Coastal hay 2.37 2.55 1.94 2.93 2.40 2.93 3.24
Feed consumed per 100 pounds gain (pounds):
Ground snapped corn 811 783 757 761 735 774 708
Citrus molasses 226 203 203 199 194 197 179
41% cottonseed meal 117 105 105 103 101 102 93
Coastal hay 113 109 83 123 99 122 122
Salt 1.03 0.74 0.97 0.68 0.66 0.88 0.78
Steamed bonemeal 1.59 0.46 0.51 1.13 0.62 0.40 1.06
*Feed cost per 100 pounds gain $22.32 $21.55 $20.33 $20.73 $19.88 $20.86 919.72
Choice carcasses, $37.50; good carcasses $35.50.
*kFeed prices: Ground snapped corn, $35 ton; citrus molasses, $27.50; 41% cottorneed meal, $65; 41% cottonseed meal plus
stilbestrol, $75; Coastal hay, $~E0; salt, 30; stc.mcd bonce:asl $90; stilbestrol implants, $0.03 for
12 ng; progesterone-estradiol, $1.75 per implant. (Feed costs include cost of implants.)






NFES 57-10 contrd.


Gains made by the implant and stilbestrol-fed cattle were similar, but the implant
cattle made somewhat cheaper gains ($0.69 to $1.67 per cwt.). There did not appear
to be any advantage to a split implant (Lot 6) over a single inplant at the
beginning of the fattening period (Lot 4). Results from the stilbestrol implants
agree very closely with those obtained in the preceding trial4, with the exception
of the lower carcas grades obtained in the 36 mg. implant group (Lot 4) this time.

Steers implanted with progesterone-estradiol (Synovex) (Lot 7) made greater
gains and had heavier carcasses than either the control (Lot 1), stilbestrol-fed
(Lot 2), or stilbestrol-implanted (Lots 3-6) cattle. Cost of gain of the group
with Synovex implants was only slightly lower than that of the lots implanted with
stilbestrol. Carcass grades were similar for the stilbestrol- and Synovex-implanted
groups. As this is the first trial at this Station with Synovex, the experiment
will be repeated to obtain more conclusive data.

ACKNOWLEDGEMENTS


Ind.


Ind.


Stilbosol for this work was furnished by Eli Lilly and Company, Indianapolie

Stilbestrol implants were supplied by Wick & Fry, Inc., Cumberland,


Synovex implants were furnished by
Research, New Brunswick, New Jersey.


The Squibb Institute for Medical


FSB
5/24/57
350 cc


4/ See footnote 1, Page 1.
4/ See footnote 1, Page 1.




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