Rock Phosphate in Stock Feeds. The Fluorine Hazard*

Snook, L. C.

doi:10.1111/j.1751-0813.1962.tb08716.x

Cited by 14 publications

(6 citation statements)

References 3 publications

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“…Não foi possível concluir se isso deveu-se à pequena absorção do flúor ou ao curto período de ingestão (6 meses) deste. Snook (1962) suplementou bovinos com 113 g de fosfato de rocha, com um teor de flúor de 1,3 a 1,5 %, durante 4 anos, sem observar sinais de fluorose.…”

Section: Discussionunclassified

“…Essa dosagem de flúor é bem inferior à dada como tóxica por Kühnert (1991). Também um efeito aditivo devido ao longo tempo de ingestão não era de se esperar, pois Snook (1962), como acima mencionado, não observou sinais de fluorose após alimentação de bovinos com fosfato de rocha contendo 1,3 a 1,5 % de flúor, durante 4 anos. Assim que nos animais deste experimento, que permaneceram em experimentação durante 33 meses, não era de se esperar uma diferença estrutural e na mineralização das costelas entre o grupo que recebeu a menor e o grupo que recebeu a maior dosagem de flúor.…”

Section: Discussionunclassified

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Estudos histológico-morfométricos e microrradiográficos de costelas de bovinos suplementados com fosfato de rocha

et al. 1997

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Pesq. Vet. Bras. 17(3/4):96-104, jul./dez. 1997 96 SINOPSE.-O objetivo do presente trabalho foi o de avaliar, através de técnicas especializadas, as possíveis alterações ós-seas produzidas em bovinos em decorrência da ingestão prolongada de diferentes níveis de flúor contido no fosfato de rocha de Tapira utilizado como fonte suplementar de fósforo. No primeiro experimento bovinos confinados ingeriram, durante 6 meses, quantidades variáveis (63 e 128g/dia) de fosfato de Tapira contendo 1.3% de flúor. No segundo experimento, bovinos em pastos de Brachiaria decumbens ingeriram, durante 33 meses, misturas minerais contendo diferentes níveis de fosfato de rocha de Tapira. No terceiro experimento, novilhas com idade inicial média de 14 meses ingeriram mistura mineral com fosfato de Tapira até a quinta lactação inclusivamente. Através de exames histológicos, morfométricos e microrradiográficos das amostras de costelas, não se observaram alterações da normalidade óssea, bem como não foram registradas diferenças entre amostras provenientes de diferentes tratamentos. Tais achados permitem inferir que, do ponto de vista de alterações ósseas, o fosfato de rocha de Tapira pode ser utilizado como fonte suplementar de fósforo para bovinos, nas dosagens, períodos e manejos alimentares estudados, sem risco de produzir alterações patológicas nos esqueleto dos animais. The present study was conducted to evaluate possible bone changes in cattle due to the ingestion of different levels of fluorine from rock phosphate used as a phophorus supplement. The bone material studied were ribs collected from cattle of three experiments where Tapira rock phosphate was used at different levels and during different periods as a partial or sole source of supplementary phosphorus. In the first experiment feedlot cattle ingested during a 6 month period 63 and 128g/day of Tapira rock phosphate containing 1.3% fluorine. In the second experiment cattle maintained in Brachiaria decumbens pastures during 33 months ingested several levels of Tapira rock phosphate in the mineral mixtures. In the third experiment heifers averaging 14 months of age ingested a mineral supplement with Tapira rock phosphate until the 5th lactation period. Careful examination of the rib samples by histological, morphometric and microradiographic techniques revealed no abnormalities which could be related to fluorine ingestion, neither any differences among tretaments regarding the bone structure. These findings support the conclusion that, as far as bone alterations are concerned, Tapira rock phosphate could be used as a source of phosphorus for cattle under the conditions described in the experiments, a practice which would markedly reduce the cost of phosphorus supplementation.INDEX TERMS: Fluorine, phosphorus supplementation, rock phosphate, bone alterations, cattle.

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Section: Discussionunclassified

Estudos histológico-morfométricos e microrradiográficos de costelas de bovinos suplementados com fosfato de rocha

et al. 1997

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“…), contain 30-40 g F/kg; this is about twice the F content of the Nauru and Christmas Island phosphates (Underwood 1981). Snook (1962) found that dairy cows could be given 60 g/d of Christmas Island rock as a P supplement without showing signs of fl uorosis but, as discussed below, they could accumulate substantial amounts of Cd in their bodies.…”

Section: Fluorinementioning

confidence: 95%

Nutrient Requirements of Domesticated Ruminants

Freer¹,

Dove²,

Nolan³

2007

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Nutrient Requirements of Domesticated Ruminants draws on the most up-to-date research on the energy, protein, mineral, vitamin and water requirements of beef and dairy cattle, sheep and goats. It defines the responses of animals, in weight change, milk production and wool growth, to quantitative and qualitative changes in their feed supply. It has particular application to grazing animals. Factors affecting the intake of feed are taken into account and recommendations are given according to the production systems being used; for instance, the feed intake of a grazing animal is affected by a larger number of variables than a housed animal. Examples of the estimation of the energy and nutrients required for the different production systems are given, as well as the production expected from predicted feed intakes. The interactions between the grazing animal, the pasture and any supplementary feeds are complex, involving herbage availability, diet selection and substitution. To facilitate the application of these recommendations to particular grazing situations, readers are directed to decision support tools and spreadsheet programs. Nutrient Requirements of Domesticated Ruminants is based on the benchmark publication, Feeding Standards for Australian Livestock: Ruminants, published in 1990 by CSIRO Publishing on behalf of the Standing Committee on Agriculture. It provides comprehensive and useful information for graziers, livestock advisors, veterinarians, feed manufacturers and animal nutrition researchers. The recommendations described are equally applicable to animals in feedlots or drought yards.

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“…The toxic factor was later identified as fluorine (Animal Research Division of the New Zealand Departme:nt of Agriculture Reports 1952-3, p. 28;1953-4, p. 34;1954-5, p. 35). Phosphatic fertilizers are known to conrain 1 to 4 % fluorine (Caro, 1964), and the danger Qif poisoning stock with fluorine in untreated phosphates used as feed supplements has been described by many authors (Emme,rling, 1902;Dammann'and Manegold, 1904: Gardiner, 1930Phillips et al, 1934;Hatfield et at., 1942;Udall, 1947;Fincher, 1952;Harris et al, 1952;Crampton, 1954;Dale and Crampton, 1955;Snook, 1962;Rek, 1967;Agarwala et al, 1971).…”

Section: Introductionmentioning

confidence: 93%

Deaths in cattle suggestive of subacute fluorine poisoning following ingestion of superphosphate

Ac²,

1976

New Zealand Veterinary Journal

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Rock Phosphate in Stock Feeds. The Fluorine Hazard*

Cited by 14 publications

References 3 publications

Estudos histológico-morfométricos e microrradiográficos de costelas de bovinos suplementados com fosfato de rocha

Estudos histológico-morfométricos e microrradiográficos de costelas de bovinos suplementados com fosfato de rocha

Nutrient Requirements of Domesticated Ruminants

Deaths in cattle suggestive of subacute fluorine poisoning following ingestion of superphosphate

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