The Tolerance of Growing Chickens for Dietary Zinc

Johnson, Dewey; Mehring, Arnon L.; Savino, Francis X.; Titus, Harry W.

doi:10.3382/ps.0410311

Cited by 29 publications

(8 citation statements)

References 6 publications

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“…These results agree with the findings of O'Dell et al (1958) and Young et al (1958), who reported that the Zn requirement for chicks fed diets based on soy protein was in the range of 30 to 50 ppm, and agree with the current NRC (1984) recommendation of 40 ppm. The excess Zn-induced reduction in gain, feed intake, and gain: feed ratios observed in Experiment 2 also has been reported by Johnson et al (1962) and by Southern and Baker (1983). Sodium zeolite A had no effect on gain, feed intake, and gain:feed ratio in Experiment 1 but reduced these variables in Experiment 2.…”

Section: Discussionsupporting

confidence: 70%

Effect of Dietary Sodium Zeolite A on Zinc Utilization by Chicks

Watkins

Southern

1993

Poultry Science

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Two experiments were conducted with chicks from 5 to 15 days posthatching to study the effect of sodium zeolite A (SZA) on Zn utilization. The corn-soybean meal basal diet was supplemented with ZnCO3 to provide three levels of dietary Zn (35, 40, and 85 ppm) in Experiment 1, and two levels of dietary Zn (85 and 4,000 ppm) in Experiment 2. Experimental diets also contained either 0 or .75% SZA, resulting in a 3 x 2 and a 2 x 2 factorial arrangement of treatments in Experiments 1 and 2, respectively. The tendency for increased growth, feed intake, and hematocrit in chicks fed Zn-supplemented diets in Experiment 1 suggests that the 35-ppm level of Zn in the basal diet was marginal for chicks. Both supplemental Zn and SZA increased (P < .02) hematocrit and plasma, pancreas, and tibia Zn and decreased (P < .02) tibia Cu. Sodium zeolite A increased (SZA by Zn, P < .03) tibia Al and tended to increase (SZA by Zn, P < .09) liver Fe in chicks fed either 35 or 85 ppm Zn, but SZA had no effect on tibia Al and liver Fe in chicks fed 40 ppm Zn. In Experiment 2, both SZA and excess dietary Zn decreased gain, feed intake, gain: feed, hematocrit, hemoglobin, and plasma alkaline phosphatase (AP) activity, and increased tibia, liver, and pancreas Zn, and tibia Al. In addition, excess Zn increased (P < .05) plasma Zn and liver Al but decreased (P < .01) plasma, liver, and pancreas Cu and percentage of tibia ash. The addition of SZA enhanced the adverse effects of excess Zn by further decreasing feed intake, hematocrit, hemoglobin, and plasma AP and Cu and by increasing tibia Al and liver Zn. Sodium zeolite A increased pancreas (P < .09) and tibia (P < .03) Zn regardless of dietary Zn concentration; however, SZA increased plasma Zn only in chicks fed 85 ppm Zn (SZA by Zn, P < .03). Sodium zeolite A tended to improve Zn utilization in chicks fed inadequate Zn but exacerbated the adverse effects of feeding excess Zn. The addition of SZA to the diet of chicks fed inadequate, adequate, or toxic levels of Zn resulted in increased tissue Zn concentration.

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Section: Discussionsupporting

confidence: 70%

Effect of Dietary Sodium Zeolite A on Zinc Utilization by Chicks

Watkins

Southern

1993

Poultry Science

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“…These results are in agreement with those of Roberson and Schaible (1960) and Johnson et al (1962). significantly reduced chick growth at each Ca level studied.…”

Section: Resultssupporting

confidence: 93%

The Availability of Calcium from Mexican and Californian Sesame Meals

Cuca

Sunde

1967

Poultry Science

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“…In chickens, 1% zinc adversely affected chick growth and feed efficiency (Roberson and Schaible, 1960). According to Johnson et al (1962), .5% zinc in the diet of growing chickens reduced liver copper concentration. Scott and Cregar (1976) reported that 20,000 ppm zinc was an effective molting agent when fed for not more than 8 days after production ceased.…”

Section: Introductionmentioning

confidence: 97%

Effect of Zinc Toxicity in Laying White Leghorn Pullets and Hens

Palafox

Ho-a

1980

Poultry Science

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Two experiments involving 124 Single Comb White Leghorn (Hy-Line) laying pullets and hens were conducted to determine the effect of zinc toxicity on bird performance. Twenty milligrams of zinc per gram of diet fed for 5 days significantly lowered fertility and hatchability of pullet eggs collected 14 to 28 days after the 5-day zinc feeding period. Zinc significantly depressed body weight on the day 5 of zinc feeding and significantly lowered egg poroduction from 0 to 4 weeks of test. Egg production from 4 to 12 weeks, feed conversion from 0 to 12 weeks, final body weight, and livability were not significantly affected. Hens fed the supplemental zinc for five days had depressed egg production from 0 to 4 weeks. Egg production from 4 to 12 weeks, feed conversion, final body weight, and livability were not significantly affected. Compared to their respective controls, 2% supplemental zinc fed for 5 days significantly improved hen but not pullet egg weight. Hen eggs collected 28 days after hens received the zinc diet contained significantly less potassium, copper, and zinc than the controls.

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The Tolerance of Growing Chickens for Dietary Zinc

Cited by 29 publications

References 6 publications

Effect of Dietary Sodium Zeolite A on Zinc Utilization by Chicks

Effect of Dietary Sodium Zeolite A on Zinc Utilization by Chicks

The Availability of Calcium from Mexican and Californian Sesame Meals

Effect of Zinc Toxicity in Laying White Leghorn Pullets and Hens

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