Comparative Availability of Phytin and Inorganic Phosphorus to Rumen Microorganisms, in vitro.

Barth, Julius; Hansard, Sam L.

doi:10.3181/00379727-109-27232

Cited by 5 publications

(1 citation statement)

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“…Although Clark et al (1986) observed higher apparent digestibility of P when the dietary Ca was 0.9% than when it was 0.6%, others have found reduced P absorption with higher concentrations of dietary Ca (Field et al, 1983;Mathur, 1953). Barth and Hansard (1962) reported that phytate P utilization was 100% when Ca:P was 2:1, but fell to 67% when Ca:P increased to 8:1. In the current experiment, Ca concentration ranged from 1.11 to 1.18% of the TMR (DM basis), and Ca:P in the TMR ranged from 2.4 to 2.6:1.…”

Section: Concentrations Of Inorganic P and Ca In Serummentioning

confidence: 99%

Effect of Grain Source and Exogenous Phytase on Phosphorus Digestibility in Dairy Cows

Kincaid

Garikipati

Nennich

et al. 2005

Journal of Dairy Science

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Two experiments were conducted to determine P digestibility in lactating dairy cows fed corn or barley as grain sources. The first experiment utilized a replicated incomplete 5 x 4 Latin square design with 8 lactating Holstein cows fed diets containing either corn alone or corn in combination with one of 4 barley varieties that differed in chemical composition. Total tract digestibility of P ranged from 11 to 29% for diets containing the barley varieties and was approximately 35% for the corn diet. A second experiment compared P digestibility in cows fed diets containing corn or barley when exogenous phytase was added to the diets. Lactating Holstein cows (n = 16) were arranged in 4 replications of a Latin square with 2 grains (barley or corn), fed separately or with added exogenous phytase (427 phytase units/kg of total mixed ration and 4 periods of 21 d. Phytate P comprised about 50% of the total P (0.46% P) in the total mixed ration. The concentration of serum inorganic P was higher in cows fed diets with exogenous phytase (5.8 vs. 6.5 mg/dL in cows fed barley diets and 5.5 vs 6.0 mg/dL in cows fed corn diets). Using acid detergent lignin as an internal marker, hydrolysis of phytate P was increased by the exogenous phytase, and total P digestibility tended to be increased. In contrast to Experiment 1, in Experiment 2 there was no effect of grain source on P digestibility and total fecal P. Dry matter intake and efficiency of milk production were not affected by exogenous phytase or grain type. Although phytase activity occurs in the rumen, physical properties of the diet and ruminal passage rates may prevent total hydrolysis of phytate in the rumen of lactating cows. Thus, exogenous dietary phytase might improve P digestibility in dairy cows in some dietary situations.

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Section: Concentrations Of Inorganic P and Ca In Serummentioning

confidence: 99%

Effect of Grain Source and Exogenous Phytase on Phosphorus Digestibility in Dairy Cows

Kincaid

Garikipati

Nennich

et al. 2005

Journal of Dairy Science

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Auswirkung von Gaben an Müsli-Kost und Zink auf verschiedene Blutparameter bei Leistungssportlern

Schardt¹

1994

Z Ernährungswiss

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A total of 51 athletes, randomly divided into two groups (with or without zinc supplementation) and respective two subgroups (with or without cereal diet) had been tested for their serum levels in respect of zinc, iron, copper, phosphorus and potassium over a period of 8 weeks, i.e. during a period of competition. Furthermore, subpopulations of lymphocytes were defined. Modifications of the immunologic defense mechanism with special regard to the zinc level could, however, not be detected. Minerals, i.e. zinc and iron revealed to decrease significantly during simultaneous uptake of certain amounts of the cereal products. This is due to the relatively high amounts of phytates in cereals which are capable to bind the trace elements in form of complex salts.

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Phosphorus bioavailability

Soares

1995

Bioavailability of Nutrients for Animals

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Comparative Availability of Phytin and Inorganic Phosphorus to Rumen Microorganisms, in vitro.

Cited by 5 publications

References 0 publications

Effect of Grain Source and Exogenous Phytase on Phosphorus Digestibility in Dairy Cows

Effect of Grain Source and Exogenous Phytase on Phosphorus Digestibility in Dairy Cows

Auswirkung von Gaben an Müsli-Kost und Zink auf verschiedene Blutparameter bei Leistungssportlern

Phosphorus bioavailability

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