Comparison of Growth Response of Chicks to Virginiamycin and Other Antibiotics

Combs, Gerald F.; Bossard, E. H.

doi:10.3382/ps.0420681

Cited by 31 publications

(14 citation statements)

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“…It may be postulated that the birds used in Experiment One developed an antibiotic-resistant microflora and thus negated the influence of the dietary antibiotics. On the other hand, antibiotics have been shown to exhibit their greatest effect on growth of chicks reared in an old environment (Coates et al, 1951;Hill et al, 1953;Combs and Bossard, 1963). Their data conflict with the results of Experiment One in which chicks were grown in contaminated quarters.…”

Section: Resultscontrasting

confidence: 67%

“…The following reports constitute a number of excellent reviews: Cuthbertson, 1952;Braude et al, 1953;Jukes and Williams, 1953;Stokstad, 1954;Ewing, 1963; however, the comparative results obtained from the different laboratories vary considerably. Several investigators (Libby and Schaible, 1955;Sherman et al, 1959); Nelson et al, 1963;and Combs and Bossard, 1963) reported that continuous use of antibiotics resulted in a decrease in their effectiveness as growth promotants in chicks. In contrast, Bird (1968) observed no change in chick growth responses to antibiotics during the period of 1951-1968.…”

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confidence: 99%

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Lack of Growth Response of Eight-week-old Broilers to Certain Antibiotics

Menge

1973

Poultry Science

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Two experiments with day-old broiler chicks designed to study the efficacy of chlortetracycline, bacitracin, oxytetracycline and penicillin in growth promotion were conducted. The first experiment included five consecutive trials. In two trials, duplicate pens of 50 males per treatment were used, and in the other three trials, duplicate pens of 50 straight-run chicks were used. A typical broiler ration was used as a control. The four dietary treatments (mg./kg.) were: chlortetracycline, 25; bacitracin, 5; oxytetracycline, 25; penicillin, 5. The second experiment consisted of two trials with ten groups of 50 straight-run chicks per treatment. Five of these groups were fed a diet containing animal protein (as in the first experiment) and the other five groups were given a diet containing all-plant protein. The antibiotic levels were 0 and 50 mg. of chlortetracycline, bacitracin, oxytetracycline, or penicillin per kilogram of diet. All trials in both experiments were terminated after 8 weeks of dietary treatments. In the first experiment and in the second experiment with diets containing animal protein, antibiotics had no growth stimulatory effect. Chlortetracycline and penicillin did, however, stimulate a significant growth response when added to an all-plant protein diet. In general, heavier body weights were obtained from antibiotics with diets containing animal protein than with all-plant protein diets.

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Section: Resultscontrasting

confidence: 67%

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confidence: 99%

Lack of Growth Response of Eight-week-old Broilers to Certain Antibiotics

Menge

1973

Poultry Science

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“…The antimicrobial activity of virginiamycin was first reported by De Somer and Van Dijck (1955) and was subsequently shown several years later to have additional potential as a growth promoter in chickens when used at subtherapeutic levels (Eyssen et al, 1962;Eyssen and De Somer, 1963;Combs and Bossard, 1963). A number of more recent reports also provide evidence for the enhancement of growth rates and feed conversion ratios by dietary levels of virginiamycin ranging from 10 to 22 mg/kg of feed (March et al, 1978;Miles et al, 1984b;Buresh et al, 1986).…”

Section: Introductionmentioning

confidence: 91%

The Response of Male Chicken Broilers to the Dietary Addition of Virginiamycin

et al. 1990

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Two replicate trials, each involving 400 Arbor Acre male broiler chicks, were conducted to determine the effect of virginiamycin as a growth promoter when added to either the feed or drinking water. A control group received no growth promoter while one treatment group was provided a diet containing 11 mg of virginiamycin/kg. Another treatment group was provided drinking water containing virginiamycin in amounts calculated to ensure equivalent or one-half equivalent intake of the antibiotic. Virginiamycin supplementation had no significant (P greater than .05) effect on mortality or feed conversion ratios, regardless of the mode of administration. Body weights at 21 days of age but not at 42 days of age were significantly (P less than .05) heavier for broilers receiving virginiamycin via the drinking water. The inclusion of virginiamycin in the feed failed to improve body weights at either 21 or 42 days of age.

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“…Virginiamycin is not active against the enterobacteriaceae and is not involved in resistance transfer among these microorganisms (Pantaleon and Chevrier, 1969). Eyssen and De Somer (1963) and Combs and Bossard (1963) reported that virginiamycin stimulated growth of chicks. March et al (1978) and Miles et al (1984) reported that virginiamycin stimulated growth and improved feed efficiency in broilers.…”

Section: Introductionmentioning

confidence: 97%

Virginiamycin and Laying Hen Performance

1985

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Two experiments were conducted for five 28-day periods each. In Experiments 1 and 2, Hyline W-36 hens, 36 and 26 weeks of age, respectively, were used. Experiment 1 was designed to measure the effect of virginiamycin on hen performance and egg characteristics when supplementing a diet having low pigmentation potential. In Experiment 2, the diet contained 3% added fat with 0, 10, and 20 ppm virginiamycin. In Experiment 1, virginiamycin-supplemented hens showed increased (P less than or equal to .05) egg production, body weight, and improved feed efficiency. When egg production and feed efficiency were ranked by quartiles within the control and virginiamycin-supplemented groups, virginiamycin was shown to benefit only the poorer producing hens. In Experiment 2, added fat improved feed efficiency; however, the response to virginiamycin, as observed in Experiment 1, did not occur.

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Comparison of Growth Response of Chicks to Virginiamycin and Other Antibiotics

Abstract: RESULTS AND DISCUSSIONExperiments 1 and 2 were run concurrently, using the same feed mixtures and chicks from the same commercial hatch.

Cited by 31 publications

References 5 publications

Lack of Growth Response of Eight-week-old Broilers to Certain Antibiotics

Lack of Growth Response of Eight-week-old Broilers to Certain Antibiotics

The Response of Male Chicken Broilers to the Dietary Addition of Virginiamycin

Virginiamycin and Laying Hen Performance

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