Fluorosis in the Laying Hen

Toledo, Bec; Combs, Gerald F.

doi:10.3382/ps.0631543

Cited by 8 publications

(3 citation statements)

References 21 publications

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“…The 100-ppm and 1300-ppm F diets resulted in significantly greater tibial F content over the control; however, the treatments were not different (P>.05) from each other. The bone F levels reported in this study were much lower than those reported by Van Toledo and Combs, Jr. (1984). Addition of Al to the diet did not significantly reduce the F content in the bone ' ' ' ' Means within a column not followed by the same superscripts are significantly different at P<.01.…”

Section: Resultscontrasting

confidence: 74%

Effect of Dietary Fluoride and Aluminum on Laying Hen Performance and Fluoride Concentration in Blood, Soft Tissue, Bone, and Egg

Hahn

Guenter

1986

Poultry Science

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Changes in laying-hen performance due to the effect of graded levels of dietary fluoride (F) have been documented earlier. The present study examined the effect of dietary F and aluminum (Al) on laying hen performance, and F levels in plasma, soft tissues, muscle, bone, and eggs. Two hundred and seventy Single Comb White Leghorn (SCWL) layers were fed a basal diet containing the following F and Al levels: control; 100 ppm F; 80 ppm Al; 100 ppm F/80 ppm Al; 100 ppm F/40 ppm Al; 1300 ppm F; 1040 ppm Al; 1300 ppm F/1040 ppm Al, and 1300 ppm F/520 ppm Al. After 112 days of feeding, the blood, tissue, bone, and egg samples were collected for analysis. High F intake significantly depressed feed intake and hen-day production and elevated serum, tissue, bone, and egg F levels. Dietary Al minimized the effect of high fluoride feeding. The mean fluoride concentration for low (80 ppm Al diet) vs. high F (1300 ppm) intake was, respectively: plasma, .2 vs. 10.1 ppm; liver, 4.5 vs. 19.2 ppm; kidney, 2.9 vs. 31.8 ppm; pectoralis muscle, 3.6 vs. 6.7; tibia muscle homogenate, 3.9 vs. 21.1 ppm, and bone, 611 vs. 2600 ppm. The majority of the F transferred to the egg was incorporated into the shell (2.8 to 307.1 ppm). Low F levels were found in albumen (fresh, .4 to 1.0 ppm) and yolk (dry fat free, 3.1 to 18.4 ppm). The data suggested that dietary F is readily accumulated in bone and kidney; however, liver and muscle are less responsive.(ABSTRACT TRUNCATED AT 250 WORDS)

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Section: Resultscontrasting

confidence: 74%

Effect of Dietary Fluoride and Aluminum on Laying Hen Performance and Fluoride Concentration in Blood, Soft Tissue, Bone, and Egg

Hahn

Guenter

1986

Poultry Science

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“…Reductions in food intake, egg production and food efficiency have been observed by previous workers (Guenter, 1979;Tues, 1979;Guenter and Hahn, 1986) in layers given higher concentrations of F in their diets. Symptoms of F toxicity such as reduced food intake and egg production (van Toledo and Combs, 1984;Hahn and Gunter, 1986) were clearly observed in the present study in layers fed on diets containing HFRP.…”

Section: Layer Experimentssupporting

confidence: 59%

“…However, the growth depressing effect of F was nullified by feeding the above F levels up to 42 d of age. The large variation observed in the level of F tolerance might be due to differences in the concentration of Ca and P in the diet, age and the strain of bird used and period of F intake (van Toledo and Combs, 1984;Huyghebaert and De Groote, 1986). The reduced performance of broilers due to F toxicity was significant only during the starter period (up to 21 d of age) but the toxicity affect was nullified by feeding the F up to 42 d of age .…”

Section: Broiler Experimentsmentioning

confidence: 99%

Utilisation of different phosphorus sources in relation to their fluorine content for broilers and layers

Rao¹,

Reddy²

2001

British Poultry Science

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1. The relative utilisation of different phosphorus sources in relation to their fluorine (F) content was studied in commercial broilers (5 to 40 d) and White Leghorn layers (252 to 364 d). The phosphorus (P) sources tested were bonemeal (BM), low fluorine (LFRP) and high fluorine (HFRP) rock phosphates and a commercial mineral mixture (CMM). The P sources were incorporated in broiler and layer diets by replacing dicalcium phosphate (DCP) on a P basis. 2. The F contents of diets based on BM, LFRP, CMM and HFRP were 53, 365, 622 and 1383 mg/kg in the broiler experiment and 34, 242, 437 and 967 mg/kg in the layer experiment, respectively. F was not detected in DCP based diets. 3. In broilers, body weight gain, food intake, gain: food, P retention and serum inorganic P content on P sources (BM and LFRP) containing F up to 365 mg/kg diet were similar to those on DCP. Body weight gain, food intake, serum calcium and inorganic P contents and retention of P were depressed in groups fed on CMM and HFRP, which may have been due to the toxic effects of F (622 and 1383 mg/kg) present in diets based on these P sources. 4. Bone ash and its P content were not affected by feeding diets containing F up to 1383 mg/kg from various P sources. The amount of F deposited in tibia increased significantly with increases in dietary F concentration. 5. In layers, egg production and food intake were not affected by F up to 437 mg/kg in diets containing BM, LFRP or CMM as the sole source of supplemental P. Egg production and food intake were depressed significantly in layers given the diet containing 967 mg F/kg from HFRP. 6. Egg mass: food, egg weight, shell quality (shell thickness and shell weight) and serum calcium and inorganic P levels were not affected by F up to 967 mg/kg in diets containing different P sources. 7. It may be concluded that the performance of broilers and layers was not affected by feeding various P supplements with dietary levels of F up to 365 and 437 mg/kg, respectively. The reduced performance in broilers and layers observed with some of the P sources may have been due to poor availability of P and/or toxic effects of F (622 and 967 mg/kg, respectively).

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