Dietary Levels of Fat, Calcium, and Vitamins A and D3 as Contributory Factors to Rickets in Poults

Stevens, V. I.; Blair, R.; Riddell, C

doi:10.3382/ps.0622073

Cited by 23 publications

(5 citation statements)

References 15 publications

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“…The one exception to this was the ash content at 21 days of age. Stevens et al (1983) also found that diets containing 7% tallow reduced tibial ash in turkey poults at 3 weeks of age.…”

Section: Discussionmentioning

confidence: 90%

Effect of Dietary Fat Supplementation on the Carcass Composition of Three Genetic Lines of Broilers

et al. 1985

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Three genetic lines of broilers - a commercial line (Ross X Arbor-Acres), and lines selected for low abdominal fat (lean line), and high abdominal fat (fat line) were fed one of two isocaloric and isonitrogenous purified diets differing in total fat content (2 vs. 9%). Carcass composition (crude protein, ether-extract, ash, and total dry matter content) was determined on four broilers/line/diet at 21 days of age and at 1 kg body weight. Carcass protein and ether-extract were not significantly (P less than .05) affected by diet at 21 days of age or at 1 kg weight. Carcass ash was significantly (P less than .01) affected by diet at 21 days of age but not at 1 kg body weight. Genetic line of broiler significantly (P less than .05) affected carcass protein, ether-extract, and ash at 21 days of age and at 1 kg body weight. Lean line broilers had a significantly (P less than .05) higher percentage of carcass protein and a significantly (P less than .05) lower percentage of carcass ether-extract than the fat line or commercial broilers.

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“…The one exception to this was the ash content at 21 days of age. Stevens et al (1983) also found that diets containing 7% tallow reduced tibial ash in turkey poults at 3 weeks of age.…”

Section: Discussionmentioning

confidence: 90%

Effect of Dietary Fat Supplementation on the Carcass Composition of Three Genetic Lines of Broilers

et al. 1985

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“…At the end of the 4-week test period, six females from each treatment (one per pen) were killed and the left tibiae excised for bone ash determination as described by Stevens et al (1983).…”

Section: Methodsmentioning

confidence: 99%

Effects of Supplementary Vitamin D3 on Egg Production of Two Strains of Japanese Quail and Growth of Their Progeny

Stevens

Blair

1985

Poultry Science

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Two strains (University of Saskatchewan, white egg and wild type) of mature Japanese quail (Coturnix coturnix japonica), following a 4-week depletion period, were fed one of four diets varying in supplementary vitamin D3: a) no supplementary vitamin D3, b) National Research Council (NRC, 1977) recommended level of 1,200 IU vitamin D3/kg feed, c) 10 times, NRC levels, and d) 100 times NRC levels for 4 weeks. Egg production, egg weight, number of softshelled eggs, body weight, and feed consumption were not affected by vitamin D3 treatment. Hatchability of the white egg strain was not affected by vitamin D3 treatment. Hatchability in the wild type strain was reduced in those birds consuming diets unsupplemented with vitamin D3 although not significantly. Tibia ash was not affected by vitamin D3 treatment. Progeny from hens receiving no supplemental vitamin D3 were smaller throughout a 5-week growth period; however, feed consumption and percentage tibia ash content were similar to those of progeny from the other treatments. Progeny fed 480 IU vitamin D3/kg feed were larger, had higher tibia ash, and similar feed consumption compared with those fed a diet with no added vitamin D3.

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“…Poorer fat digestion at an early age could limit the absorption of fat soluble vitamins, especially cholecalciferol (vitamin D 3 ), at 877 878 V. I. STEVENS AND R. E. SALMON a time when poults are susceptible to rickets. Previous studies have also shown that excess dietary retinol (vitamin A) may interfere with absorption and/or metabolism of cholecalciferol and result in increased incidence of leg problems in turkeys (Stevens et al, 1983;Metz et al, 1985;and Veltmann et al, 1987).…”

Section: Introductionmentioning

confidence: 93%

Beta‐Carotene supplementation of turkey diets varying in fat and retinol

Stevens

Salmon²

1989

British Poultry Science

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1. The effects of supplementary beta-carotene (BC) at 0, 1.5, 15, 150, 1500 or 15,000 mg/kg diet on performance, incidence of leg problems, tibia ash, and plasma and liver concentration of BC and retinol of poults to 4 weeks of age were studied. 2. Body weight and food intake increased with dietary BC supplementation. Incidence of leg problems was not affected but tibia ash increased with BC supplementation. Plasma and liver BC and liver retinol increased with dietary BC but plasma retinol was not affected. 3. The effects of 0, 1.5, 15 or 150 mg BC/kg in diets containing either 30 or 60 g added fat/kg and either 1.2 or 12.0 mg retinol/kg on the above properties were studied in poults to 4 weeks of age. 4. Performance was not significantly affected by dietary fat. Efficiency of utilisation of food was depressed by the higher concentration of retinol. At 3 weeks of age birds given BC had fewer leg problems and higher tibia ash values than the control birds. Liver BC and retinol and plasma BC concentration increased with dietary BC. By 4 weeks, plasma and liver BC was higher and liver retinol was lower for birds given 1.2 compared with those given 12.0 mg/kg of retinol.

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Dietary Levels of Fat, Calcium, and Vitamins A and D3 as Contributory Factors to Rickets in Poults

Cited by 23 publications

References 15 publications

Effect of Dietary Fat Supplementation on the Carcass Composition of Three Genetic Lines of Broilers

Effect of Dietary Fat Supplementation on the Carcass Composition of Three Genetic Lines of Broilers

Effects of Supplementary Vitamin D3 on Egg Production of Two Strains of Japanese Quail and Growth of Their Progeny

Beta‐Carotene supplementation of turkey diets varying in fat and retinol

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