Wahlstrom, Richard C.

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South Dakota State UniversityOpen PRAIRIE: Open Public Research Access InstitutionalRepository and Information ExchangeSouth Dakota Swine Field Day Proceedings andResearch Reports, 1959 Animal Science Reports1959Further Studies of the Effect of Antibiotics inRations for Growing-Finishing SwineRichard C. WahlstromSouth Dakota State UniversityFollow this and additional works at: http://openprairie.sdstate.edu/sd_swine_1959This Report is brought to you for free and open access by the Animal Science Reports at Open PRAIRIE: Open Public Research Access InstitutionalRepository and Information Exchange. It has been accepted for inclusion in South Dakota Swine Field Day Proceedings and Research Reports, 1959 byan authorized administrator of Open PRAIRIE: Open Public Research Access Institutional Repository and Information Exchange. For moreinformation, please contact michael.biondo@sdstate.edu.Recommended CitationWahlstrom, Richard C., "Further Studies of the Effect of Antibiotics in Rations for Growing-Finishing Swine" (1959). South DakotaSwine Field Day Proceedings and Research Reports, 1959. Paper 7.http://openprairie.sdstate.edu/sd_swine_1959/7.. • • I FURTHSR STUDIES OF THE EFFECT OF ANTIBIOJ� S IN RATIONS FOR GROWING-FINISHING S\'JINE .!/ Richard c. Wahlstrom The continuous use of antibiotics in swine feed$ has raised the question as to whether an antibiotic loses some of its effectiveness when fed contin­uously. Several new antibiotics or combinations of antibiotics are becoming available. This study was designed to study the effectiveness of some of the newer antibiotic5 in relation to an antibiotic that has been fed in the South Dakota Station herd for a number of years. Experimtn!!l � Seventy-two spring farrowed pigs were used in this experiment. They were allotted into 12 lots of 6 pigs each on the basis of litter, weight and sex. All lots were self-fed a complete mixed ration in concrete-floored pens. Two lots of pigs received each of the following experimental treatments: L ot l Lot 2 Lot 3 Lot 4 - Basal - Basal plus 20 - Basal plus 10 - Basal plus 50 cillin, 41 .8% Lot 5 - Basal plus 25 tomycin). grams aureomycin per ton grams erythromycin per ton grams SFS per ton (41.8% streptomycin, 16.4% peni­sulfaquinoxaline ). grams Pro-Strep per ton (25% penicillin, 75 % strep-Lot 6 - Basal plus 26. 25 grams antibiotic combination per ton (5 grams aureomycin, 2.5 grams erythromycin, 12 . 5  grams SPS, 6. 25 grams Pro-Strep). The composition of the basal ration is given in table 1 .  Table 1 .  Composition of Basal Ration Ground yellow corn Soybean oil meal Tank age Di-calcium phosphate Limestone Trace mineral salt Vitamin supplement !/ To approximately llO lbs. BT.o( percent} 12.5 5.0 0. 1 0.2 0.5 • 0.1 110 lb$. to market wei ht 90.Q percent) 5. 8 2.3 0. 7 0. 6 0. 5 0. 1 .....,�����������·������������������--����-!/ Furnished l mg. riboflavin, 2 mg. pantothenic acid, 4. 5 mg. niacin, 5 mg. choline and 5 mcg. vitamin B12 per pound of ration. Summary 5ll. Resul:t! The data surrmarized in table 2 show that for the initial period there was an increase in daily gains when each of the antibiotics were fed. This increase ranged from 3 percent for the erythromycin to 14  percent for the antibiotic combination. At the final vieigh period the differences in rate of gain had '!/ Presented at South Dakota State College Swine Field Day, August 28, 1959. •I l ._, - l • I ... .. • • • decreased. Heavi est  pigs at  this  time wer e  the pigs r ec e iving the streptomyc i n­peni c i l l in-sul f aquinoxal i ne mixture. Thi s  lot had a 10.5 percent faster gain  than the control lot. The antib iotic combi nation and Pro-Strep a l so increased gaiaa during the entire per iod whi le erythromyci n and aureomyc in showed l ittl e d i f ference from the contro l s .  Feed e ffic i ency d ata �ere ava i l able only for the i n i tia l period. A l l  anti­biotics  i ncreased feed e ff i c iency during th is period. Pigs fed Pro-S trep required the least feed , twenty s ix pounds less feed per hundred we i ght of  gain  than  the control p i gs . Feed savings from the other ant ibiotics  ranged from 5 to 20 pounds per hundred wei ght of gain. Table 2 .  Results o f  An tibiotic s  in  Growing-Finish i ng Swi ne Rations. (May 13  - Augus t  1 7 ,  1958) Lot No. l 2 3 5 6 . Anti bioti c y Gr.2!!!.Lper ton None Aureomyc in  Erythromyci n  4 S FS  50 Pro-Strep Combinati ' No. of pigsE/ Av . i n i ti a l  wt. , l b ,  Av. f i na l wt. , lb.  Av.  da i ly g a i n ,  l b. To 1 10 lb. To Aug .  17 Av. dai ly feed , Av, feed per 100 lb. 0 20 10 12 3 1 . 8  177 . 8  1 . 36 1 . 53 1 1  32. 0 177 . 5  1 . 46 I 1 . 5� .· 12 3 1 . 8  180. 2 1 . 40 1 .55 3 . 60 · · ·  gain ,  lb. (To 1 1 0. lb. ) 276 264 257 !/ See e xper imental pl an for exp l ana tion of treatme nt. 25 26 . 25 1 2  3 1 . 8  192. 9 1 . 53 1 . 69 12 31 . 7 183. 3  1 . 49 1 . 59 ..... � - 1· 4 . 15 3 . 73 27 1 250 .. . , 12 31 . 8  1 88 . 9 1 . 55 1 . 64 3 . 97 256 !2/ Two re pl icates of 6 pigs  each per trea tment. <Xie pig died i n  lot 2 ,  d a ta are for 1 1  pigs. J I I I I_. ,..I I I .. , • ·­• 

Further Studies of the Effect of Antibiotics in Rations for Growing-Finishing Swine

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Further Studies of the Effect of Antibiotics in Rations for Growing-Finishing Swine

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