Group Title: Animal husbandry mimeograph series - University of Florida Agricultural Experiment Station ; 55-2
Title: High level aureomycin supplementation of growing-fattening pigs
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Permanent Link: http://ufdc.ufl.edu/UF00072845/00001
 Material Information
Title: High level aureomycin supplementation of growing-fattening pigs
Series Title: Animal husbandry mimeograph series
Physical Description: 3 leaves : ; 28 cm.
Language: English
Creator: Wallace, H. D ( Harold Dean )
Gillespie, Larry, 1925-
University of Florida -- Agricultural Experiment Station
University of Florida -- Dept. of Animal Husbandry and Nutrition
Publisher: Agricultural Experiment Station, Dept. of Animal Husbandry and Nutrition
Place of Publication: Gainesville Fla
Publication Date: 1955
 Subjects
Subject: Swine -- Feeding and feeds -- Florida   ( lcsh )
Swine -- Growth -- Florida   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
non-fiction   ( marcgt )
 Notes
Statement of Responsibility: H.D. Wallace and L. Gillespie.
General Note: Caption title.
General Note: "January, 1955."
 Record Information
Bibliographic ID: UF00072845
Volume ID: VID00001
Source Institution: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 76925093

Full Text

_-


MAR 17 1955


Animal Husbandry Mimeograph January, 1955
Series No. 55-2


HIGH LEVEL AUREOMYCIN SUPPLEMENTATION
OF GROWING-FATTENING PIGS

H. D. Wallace and L, Gillespie1


Antibiotics have been widely accepted as valuable feed ingredients for

growing-fattening swine. Recommended levels of feeding presently range from

about 2,5 mg. to 10 mg. of antibiotic per pound of feed. These levels vary

some according to the antibiotic used and the class of swine being fed. The

higher levels are suggested for very young pigs and particularly for animals

reared on milk replacements.

This study was undertaken to determine the feasibility of supplementing

weanling pigs with levels of aureomycin higher than normally recommended.


Experimental



Thirty two weanling Hampshire pigs (56 days old) were divided into four

experimental groups. Each experimental group consisted of two lots of four

animals. They were self-fed the experimental rations on concrete floored

pens which were washed daily.

The basal ration consisted of the following ingredients and contained

approximately 16 percent of crude protein,


Ground Yellow corn 77.0
Soybean Oilmeal 21.0
Ground Limestone 1.0
Steamed bonemeal 0.5
Salt-trace minerals 0,53
100 .03


1Wallace, Associate Animal Husbandman, Agricultural Experiment Station,
Gillespie, Graduate Assistant, Department of Animal Husbandry and Nutrition.
The technical assistance of W. E. Collins, is gratefully acknowledged.








The salt-trace mineral mixture was composed of 50 pounds iodized salt;

921 gm, manganese sulfate; 398 gm. ferrous sulfate; 125 gm, copper sulfate;

and 10 gm. cobalt carbonate. The following levels of B-vitamins were added

to all rations per 100 lbs, of feed: 1 gm, thiamine, 230 mg, riboflavin,

2.33 gm. niacin, 1 gm, pantothenic acid,. 375 mg, pyridoxine, 19.4 gm. choline

chloride, 22,7 mgo folic acid and 1.0 mg, vitamin B12. The levels of aureo-

mycin supplementation studied are given in Table 1.

Results and Discussion

Results of the experiment are summarized in Table 1. At the end of eight

weeks Group I (Basal) had gained at an average rate of 1,30 lbs, per day, and

required 2,90 pounds feed per pound gain The addition of 5 mg. aureomycin

to each pound of basal ration (Group 2) resulted in only a slight improvement

in gains and feed efficiency, When the level of aureomycin supplementation

was increased to 25 mg, per pound (Group 3) gains were increased to 1,44 lbs.

per day and feed efficiency improved to 2.80, A further increase in the level

of antibiotic supplementation to 50 mg, per pound (Group 4), gave an additional

response in average daily gains. Average daily feed consumption during the

first eight weeks increased with the increase in level of aureomycin,

The experiment was terminated by individually weighing off the pigs as

they reached a weight of approximately 195 pounds. Final average daily gain

figures for the entire experiment showed the same trend which was apparent

during the first eight weeks, However, the magnitude of the differences was

less; indicating that the greatest effect from feeding aureomycin at high

levels was produced during the early growth period. Average daily gains and

feed efficiencies for 0, 5, 25, and 50 mg. levels of aureomycin supplementation

were respectively, 1,53, 3,09; 1,55, 3,21; 1,59, 3,02; and 1,66, 2,92, These

represent fairly good gains and the feed conversion values are exceptionally

good,










TABLE 1, HIGH LEVEL AUREOMYCIN SUPPLEMENTATION OF GROWING-FATTENING PIGS


Experimental Treatments


Basal


Basal f 5 mg,
aureomycin
per lb, of feed


Basal / 25 mg,
aureomycin per
lb, of feed


Basal / 50 mg,
aureomycin per
lb, of feed


Group number
Number of Pigs
Initial weight, lbs.

First Eight Weeks
AV, daily gain, lbs.
Feed per pound gain, lbs,
Av. Daily feed per pig, lbs.

Entire Experiment
Av. daily gain, lbs,
Feed per pound gain, lbs.
Av. Daily feed per pig, lbs.
Av. final wt., lbs.
Number days on experiment


1
8
42o3


1.30
2,90
3.78


1.53
3,09
4,74
196.7
100.6


2
8
42A4.


1.34
2,87
3,85


1,55
3,21
4,99
197,3
99.7


3
8
41.9


1,44
2.80
4,03


1,59
3,02
4,81
192.7
95,6


4
8
42,3


1,48
2.79
4.13


1,66
2.92
4,85
194,9
91.9








SUMMARY

Thirty two weanling pigs, divided into four similar groups, were fed a

well fortified corn-soybean oilmeal rationsupplemented with 0, 5, 25, and 50

mgs, of aureomycin per pound of feed,

At least a slight increase in gains was observed with each increase in

the level of aureomycin fed. The high level (50 mg,) resulted in only 8S

percent improvement in gains over the controls throughout the entire period,

However, the high level did produce a 14 percent increase in rate of gain

during the first 8 weeks of the trial,

Overall feed efficiency was not improved by the addition of 5 mgo of

aureomycin but was at the two higher levels of supplementation,

Daily feed intake was increased at all levels of supplementation.

This experiment indicates that presently recommended levels of antibiotic

feeding may not be stimulating the pig to maximum performance, However, the

present cost of high level feeding would make such a program economically un@

feasible in the case of thrifty, well fed and managed swine. The value of

high level antibiotic feeding for unthrifty pigs maintained under poor sani-

tary conditions needs to be investigated,














Animal Husbandry
1/18/55
100 copies


-3-




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