SDepartment of Animal Science Florida Agricultural
imeograph Series No. AN68-1 Experiment Station
f July, 1967 Gainesville, Florida
INFLUENCE OF FEED ADDITIVES ON PERFORMANCE OF GROWING PIGSI/
H. D. Wallace, M. E. Demaree and G. E. Combs2-
High level copper, Aureo S-P-250 (combination of chlortetracycline, sulfametha-
zine and penicillin) and NF-180 (Furazolidone) have all been used effectively as
feed additives for growing swine. The experiment summarized in this report was de-
signed to study the relative effectiveness of the three materials. It was also de-
sired to compare the response of smaller, less thrifty pigs to that of larger, thrif-
Sixty-four crossbred (Landrace-Duroc x Hampshire) and purebred Duroc pigs were
divided into eight lots of eight pigs each according to breed, sex and weight. Two
lots were fed on each of the following treatments:
1. Basal diet
2. Basal diet + 250 ppm copper as CuSO4
3. Basal diet + 2 lb. ASP 250/ton
4. Basal diet + 2 lb. NF-180/ton
All pigs were self-fed in concrete pens. The basal diet is presented in Table 1.
The experiment was terminated after 73 days. Pig gains were analyzed for significance
by the analysis of variance.
Results and Discussion
Information on feedlot performance is presented in Table 2. The pigs were div-
ided into two test groups designated as Group 1 and Group 2. Group 1 included the
smaller, poorer-doing pigs which averaged about 22 lb. initially. Group 2 included
the larger, thriftier pigs which averaged about 42 lb. initially.
The difference in performance of pigs between the two groups was significant
(P < .01).
Although not statistically significant, all three feed additives copper,
ASP-250 and NF-180 seemingly improved rate of gain and feed conversion for the
small pigs (Group 1). Response was essentially the same for all additives.
1/ Supported in part by a grant-in-aid from American Cyanamid Co., Princeton,
]/ Wallace, Animal Nutritionist; Demaree, Graduate Assistant; and Combs, Animal
Nutritionist, Department of Animal Science.
None of the additives improved performance of the heavier, thriftier pigs
These results tend to substantiate the general observation that feed additives
are more helpful for smaller, less thrifty pigs than for larger, thriftier animals.
Table 1. Basal Diet
Ground yellow corn 76.37
Soybean oilmeal (50%) 20.00
Defluorinated phosphate 2.00
Iodized salt 0.50
Trace mineral mixturea 0.05
B-vitamin premixb 0.05
B12 supplement 0.03
Vitamin A and D premixd 1.00
a Contained 11% calcium, 10% manganese, 10% iron, 10% zinc,
1% copper, 0.3% iodine and 0.1% cobalt.
b Contained 8,000, 14,720, 36,000 and 40,000 mg. per lb.,
respectively, of riboflavin, pantothenic acid, niacin
and choline chloride.
c Contained 20 mg. B12 per lb.
d Contained 140,000 I.U. vitamin A and 50,000 I.U. vitamin
D3 per lb.
Table 2. Influence of feed additives on performance of growing pigs
Treatment Basal Basal Basal +
Basal + copper + ASP-250 NF-180
No. pigs per lot 8 8a 8 8
Average initial wt., lb. 22.1 22.4 22.0 22.0
Average final wt., lb. 129.0 136.1 137.1 137.8
Average daily feed, lb. 3.82 3.90 3.91 3.92
Average daily gain, lb. 1.46 1.56 1.58 1.59
Feed per lb. gain, lb. 2.62 2.50 2.47 2.47
No. pigs per lot 8 8 8 8
Average initial wt., lb. 42.8 42.6 41.8 41.5
Average final wt., lb. 172.3 170.6 171.3 170.0
Average daily feed, lb. 5.11 5.08 5.05 5.21
Average daily gain, lb. 1.77 1.75 1.77 1.76
Feed per lb. gain, lb. 2.89 2.90 2.85 2.96
a One pig removed from experiment after 3 days due to anal prolapse.