Re-Evaluation of Protein Requirements of Growing-Fattening Swine as Influenced by Feeding an Antibiotic

Catron, D. V.; Jensen, A. H.; Homeyer, P. G.; Maddock, H. M.; Ashton, G. C.

doi:10.2527/jas1952.112221x

Cited by 35 publications

(11 citation statements)

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“…The beneficial effects of antibiotics have been attributed, either singly or in combination, to a metabolic effect (Braude and Johnson, 1953), a nutrient sparing effect (Catron, Jensen, Homeyer, Maddock and Ashton, 1952) or a low-level pathogen control effect (Speer, Vohs, Catron, Maddock and Culbertson, 1950). The basic mechanism of action whereby carbadox stimulates growth has not been determined.…”

Section: Discussionmentioning

confidence: 99%

Efficacy of feed additives in enhancing performance of growing pigs

1980

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BSTRACTThe efficacy of feed additives in enhancing the performance of growing pigs, together with the effect of different protein levels (18 v. 16% from 13 to 18 kg body weight and 16 v. 14% from 18 to 39 kg body-weight), were evaluated in three experiments with 412 pigs. In Experiment 1, from 13 to 39 kg body weight, pigs receiving 55 p.p.m. carbadox (C) produced a greater (P<0-05) average daily live-weight gain than did the non-medicated (NM) pigs and those receiving 275 p.p.m. chlortetracycline-sulphamethazinepenicillin (ASP) with a similar but non-significant (P>0-05) trend in daily feed intake and gain/feed ratio. The ASP pigs also produced a greater (P<0-05) weight gain than the NM pigs. The higher dietary protein level sequence produced a greater (JP<0-05) weight gain and gain/feed ratio. In Experiment 2, from 16 to 39 kg body weight, NM control pigs achieved high weight gains, and all the feed additive treatments studied [C+106 p.p.m. of the worming agent pyrantel tartrate (C+P); ASP+8 mg of the worming agent levamisole-HCl per kg body weight fed once on day 7 of the experiment (ASP+L); and 113 p.p.m. tylosin+13 p.p.m. of the worming agent hygromycin B] were similar to the NM controls in daily feed intake, weight gain and gain/feed ratio. However, in Experiment 3, the C+P and ASP+L treatments resulted in a greater (P<0-05) weight gain with a trend toward greater daily feed intake than did the NM control treatment from 17 to 35 kg. The weight gain of the ASP+L pigs was also greater (P<0-05) than that of 165 p.p.m. oxytetracycline and NM pigs from 35 to 57 kg. From 57 to 96 kg all the pigs received the same NM control diet and their weight gains were similar. The gain/feed ratio was similar among the treatments within each of the weight periods in Experiment 3. Pigs slaughtered at the beginning and at various stages during Experiments 2 and 3 were free of internal parasites and migration damage.

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Section: Discussionmentioning

confidence: 99%

Efficacy of feed additives in enhancing performance of growing pigs

1980

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“…Crampton and Ashton (1946) stated that reduction of the pro tein level from 15 to 13 percent did not affect carcass excel lence. Catron et al (1952) reported that the reduction of 6 percentage units from 20, 17 and l4 percent protein at 35 to 75, 75 to 150 and 150 to 200 pounds body weight, respectively, resulted in no significant differences in backfat, percent lean cuts or dressing percent.…”

Section: Effect On Carcass Qualitymentioning

confidence: 98%

“…Thus, the early 1950's were marked by a re-evaluation of the protein requirement of the pig. Cunha et al (1950) suggested that the protein requirement of the growing pig needed reexamination, using adequate amounts of vitamin Catron _et (1952) reported that the addition of an anti biotic to rations with protein levels of l4 percent from 35 to 75 pounds of body weight, 11 percent from 75 to 150 pounds and 8-percent from I50 to 200 pounds resulted in performance equal to that of rations with 6 percentage units more of protein. Catron et (1932) further stated that, contrary to previous recommendations, higher levels of protein were in excess of the pig's requirements.…”

Section: Protein Level Studiesmentioning

confidence: 99%

Substitution rates and economic optima in corn-soybean rations for growing-finishing swine

Johnson

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“…Cunha et al (1950) suggested that the protein requirement of the growing pig needed reexamination, using adequate amounts of vitamin Catron _et (1952) reported that the addition of an anti biotic to rations with protein levels of l4 percent from 35 to 75 pounds of body weight, 11 percent from 75 to 150 pounds and 8-percent from I50 to 200 pounds resulted in performance equal to that of rations with 6 percentage units more of protein. Catron et (1932) further stated that, contrary to previous recommendations, higher levels of protein were in excess of the pig's requirements.…”

Section: Review Op Literature Protein Level Studiesmentioning

confidence: 99%

“…Crampton and Ashton (1946) stated that reduction of the pro tein level from 15 to 13 percent did not affect carcass excel lence. Catron et al (1952) reported that the reduction of 6…”

Section: Effect On Carcass Qualitymentioning

confidence: 99%

Substitution rates and economic optima in corn-soybean rations for growing-finishing swine

Johnson¹

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Re-Evaluation of Protein Requirements of Growing-Fattening Swine as Influenced by Feeding an Antibiotic

Cited by 35 publications

References 0 publications

Efficacy of feed additives in enhancing performance of growing pigs

Efficacy of feed additives in enhancing performance of growing pigs

Substitution rates and economic optima in corn-soybean rations for growing-finishing swine

Substitution rates and economic optima in corn-soybean rations for growing-finishing swine

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