FEED ADDITIVES FOR GROWING-FINISHING SWINE 1/
Research Progress Report 39 August 1962, Final Report
R, A. Pickett and W. M. Beeson, Animal Sciences Department
SUMMARY
None of the feed additives fed in this experiment produced a significant increase in rate of gain to market weight. However, tylosin and a rotation of tylosin, terramycin and penicillin-streptomycin resulted in 5.8 and 8.0 per cent increases, respectively, in daily gain. Pigs receiving the antibiotic rotation required 5 percent less feed per pound of gain than did the control pigs.
The anthelmintic, thiabendazole, did not markedly affect gains but did effectively eliminate roundworms from pigs as long as this additive was fed.
Terramycin, plus the addition of NF-180 for the first 5 weeks of the experiment, resulted in only a slight improvement in gain.
FEED ADDITIVES
Combinations of different types of antibiotics have been more effective at times than a single antibiotic for swine. This experiment was designed to compare the rotation of antibiotics as compared to a single antibiotic as well as to test a new antibac -terial combination of Terramycin and NF-180.
A new anthelmintic, thiabendazole was also tested for its affect on pigs’ growth as well as control of the large roundworm of swine.
EXPERIMENTAL PROCEDURE
Seventy-two crossbred weanling pigs averaging 42 pounds were divided into six lots of 12 pigs each on the basis of sex, weight and litter. Each group had access to similar housing, feed and water equipment.
A 16 percent protein corn-soy ration was fed until the pigs reach an average weight of 100 pounds. The protein level fed from 100 to 150 pounds was 14 percent and was lowered to 12 percent when the pigs weighed 150 pounds.
Experimental treatments were:
Lot 16—Basal ration (see Table 1)
Lot 17--Basal plus Tylosin (20 grams per ton to 100 pounds, 10 grams per ton from 100 to 200 pounds)
Lot 18--Basal plus 20 grams Tylosin per ton to 100 pounds, 10 grams Terramycin per ton from 100 to 150 pounds, 10 grams Penicillin-Streptomycin (1:3) from 150 pounds to market weight.
Lot 19--Basal plus 2 pounds NF-180 and 50 grams Terramycin per ton for first 5 weeks at which time the NF-180 was dropped. When the pigs averaged 100 pounds the Terramycin was reduced to 10 grams per ton for the remainder of the experiment.
Lot 20--Basal plus .01 percent Thiabendazole
Lot 21--Basal plus .01 percent Thia-
1/ This research was supported in part by research grants from Eli Lilly & Company, Greenfield, Indiana, Hess & Clark, Ashland, Ohio, and Merck Sharp & Dohme, Rahway,
New Jersey.
PURDUE UNIVERSITY • Agricultural Experiment Station • Lafayette, Indiana