Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Effects of time and dietary iron on tissue iron concentration as an estimate of relative bioavailability of supplemental iron sources for ruminants
Autore:
van Ravenswaay, RO; Henry, PR; Ammerman, CB;
Indirizzi:
Univ Florida, Dept Anim Sci, Gainesville, FL 32611 USA Univ Florida Gainesville FL USA 32611 Anim Sci, Gainesville, FL 32611 USA
Titolo Testata:
ANIMAL FEED SCIENCE AND TECHNOLOGY
fascicolo: 3-4, volume: 90, anno: 2001,
pagine: 185 - 198
SICI:
0377-8401(20010416)90:3-4<185:EOTADI>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
FERROUS SULFATE; MANGANESE; SHEEP; CHICKS; METABOLISM; CALVES;
Keywords:
iron; bioavailability; ruminants;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
28
Recensione:
Indirizzi per estratti:
Indirizzo: Ammerman, CB Univ Florida, Dept Anim Sci, POB 110900, Gainesville, FL 32611 USA Univ Florida POB 110900 Gainesville FL USA 32611 FL 32611 USA
Citazione:
R.O. van Ravenswaay et al., "Effects of time and dietary iron on tissue iron concentration as an estimate of relative bioavailability of supplemental iron sources for ruminants", ANIM FEED S, 90(3-4), 2001, pp. 185-198

Abstract

Two experiments were conducted to investigate the effects of time and dietary Fe on tissue T;e concentrations following short-term, high level supplementation for use as a bioassay procedure for supplemental Fe sources for ruminants. In Experiment 1, 28 wethers were allotted randomly to four experimental diets which were fed for 15 or 30 days. The basal maize-soyabean meal-cottonseed hulls diet (193 mg kg(-1) Fe) was supplemented with 0, 400, 800 or 1200 mg kg(-1) added Fe from reagent grade ferrous sulfate (FeSO4. 7H(2)O). Iron concentrations in liver, kidney, and spleen increased (P < 0.05)as dietary Fe increased; however., muscle, heart, and bone Fe concentrations were unaffected. A logarithmic transformation of liver or kidney Fe concentrations at 30 days regressed on added dietary Fe produced the best fits to a linear model. In Experiment 2, bioavailability of Fe from three feed grade ferrous carbonates known to differ (carbonates A, B, and C) was compared to that from reagent grade ferrous sulfate. The dietary treatments fed for 30 days included the above basal diet (90 mg kg(-1) Fe) supplemented with 0, 300, 600 or 900 mg kg(-1) added Fe from ferrous sulfate or 600 mg kg(-1) Fe from ferrous carbonates A, B, or C. Liver T;e concentrations from sheep fed ferrous sulfate were numerically greater than those of animals fed the carbonate sources or control diet. Kidney Fe concentrations from lambs fed ferrous sulfate at 600 mg kg(-1) Fe or carbonate-A were greater (P < 0.05) than those fed carbonates B or C. Iron concentrations in spleen were lower (P <less than> 0.05) in lambs fed carbonate-B than for those fed 600 mg kg(-1) Fe as ferrous sulfate, but were similar to other carbonates. Overallaverage bioavailability estimates based on multiple regression slope ratios for the three tissues were ferrous sulfate 1.00, carbonate-A 0.55, carbonate-B 0.00, and carbonate-C 0.20. Estimates for carbonates A and C were similar to those based on hemoglobin concentrations reported previously for young swine supplemented at dietary concentrations near the requirement. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/10/20 alle ore 16:24:17