| Material Information
||A long-time study on the feeding of chlorotetracycline (Aureomycin) to gestating-lactating sows
||Animal husbandry mimeograph series
||4 leaves : ; 28 cm.
||Wallace, H. D ( Harold Dean )
Haines, C. E
University of Florida -- Dept. of Animal Husbandry and Nutrition
||University of Florida, Dept. of Animal Husbandry and Nutrition
||Place of Publication:
||Sows -- Feeding and feeds -- Florida ( lcsh )
Swine -- Feeding and feeds -- Florida ( lcsh )
||government publication (state, provincial, terriorial, dependent) ( marcgt )
non-fiction ( marcgt )
||Statement of Responsibility:
||H.D. Wallace and C.E. Haines.
| Record Information
||University of Florida
||All rights reserved by the source institution and holding location.
||oclc - 76942135
Animal Husbandry Mimeograph /
Series No. 55-12 February, 1956
A LONG-TINE STUDY ON THE FEEDING OF CHIDROTETPJCYCLINE
(Aureomycin) TO GESTATING-LACTATING SOWS.1
H. D. Wallace and C. E. Haines.2 uhs
The value of antibiotics in the rations of growing pigs has been con-
clusively demonstrated by a large number of experiments. Several investi-
gations have tested the value of antibiotics in the sow ration during a
single reproduction cycle. In these studies most of the measurable effects
were favorable to the antibiotic feeding. However, in some cases no effects
have been observed.
The study reported herein was undertaken to obtain information on the
long-time effect of feeding aureomycin to breeding animals.
The experimental animals (purebred Duroc, Hampshire, and Spotted Poland
China) were divided into two treatment groups shortly after weaning. During
the growing period the control group received no antibiotic, while the aureo-
mycin supplemented group was fed 20 gm. per ton of feed. When the animals
weighed approximately 200 lbs., they were started on a hand feeding program
and fed the basal ration indicated in Table 1.
Table e1 Basal ration
Ground yellow corn 37.0
Ground whole oats 37.0
Soybean oilmeal 14.0
Alfalfa meal 10.0
Ground limestone 1.0
Steamed bonemeal 0.5
*Salt-trace minerals 0.53
*Composed of: Iodized salt 50 lbs., MmSolH20 921 gm., FeSo4.H20 398,
CuSoL.5H20 125 gn., and CoCo3 10 gmi
1 This study was supported in part by a grant-in-aid from Lederle Laboratories,
Pearl River, New York.
2 Wallace, Associate Animal Husbandman, Haines, Graduate Assistant, Department
of Animal Husbandry and Nutrition. The technical assistance of Earl Collins,
Swine Herdsman is gratefully acknowledged.
At this time the level of aureomycin was increased to 40 gm. per ton of feed
for the supplemented group. The animals were fed on grass and legume pastures
during the course of the experiment except for a period of one week at each
farrowing when they were confined in a farrowing barn. The level of feeding
was maintained the same for the two groups. This level was regulated during
gestation to affect the desired body condition in the animals and ranged from
3-6 lbs. per head per day. Three days prior to farrowing due date, the animals
were placed in a farrowing barn. When the pigs were one week of age the sows
and litters were moved to pasture. All pigs were provided a creep ration con-
taining aureomycin at 2 weeks of age. During lactation the sows were given as
much feed as they would clean up twice per day.
A fairly rigid culling plan was followed based on reproductive perfor-
mance. After five consecutive litters the numbers of original animals in the
two groups were reduced to such an extent that the experiment was discontinued*
A summary of the results is presented in Table 2.
Results and Discussion
As can be seen from the date in Table 2, there was no difficulty en-
countered in breeding the animals of either group. The breeding efficiency
was good and quite similar for the two groups. The number of live pigs
farrowed per litter was slightly in favor of the control group. Data col-
lected on numbers of pigs born dead and resorbed fetuses indicated no sig-
nificant difference between the group. The average pig birth weights were
some heavier for the supplemented sows, but the differences appeared to re-
flect nothing more than the previously mentioned smaller litter size. The
control sows consistently weaned more pigs per litter and more total weight at
56 days. A statistical analysis of the production, however, showed no signi-
ficant difference. Considerable variation was observed in the performance of
the animals in each group.
TABLE 2. THE LONG-TIEM FEEDING OF AUREOMYCIN TC SOWS DURING GESTATION AND LACTATION.
LITTER NO. NO. OF AV. NO. NO. LIVE AV. BIRTH AV. NO. AV. LITTER WT. CHANGE
SOWS SERVICES PIGS PER WT./PIG PIGS WT. AT 56 OF SOWS
PER SOW LITTER WEANED DAYS DURING
A study has been conducted to determine the effect of feeding h0 gm. of
aureomycin per ton of feed to sows during five succeeding reproduction cycles.
No significant effects were observed on the breeding efficiency or repro-
ductive performance of the sows4
An. Husb. Exp. Stao