Faecal and urinary excretion of iron, copper, zinc and manganese in faunated and defaunated wethers fed semi-purified diets of different carbohydrate composition

Kreuzer, Michael; Kirchgeßner, M.

doi:10.1016/0377-8401(90)90076-k

Cited by 5 publications

(5 citation statements)

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“…The absorption and retention of copper is higher in defaunated animals, and an outbreak of chronic copper toxicity has occurred in animals maintained without ciliate protozoa (Ivan et ai., 1986). The evidence that ciliate protozoa can influence the bioavailability of selenium and other trace elements is equivocal (Hidiroglu and Jenkins, 1974;Ivan and Veira, 1982;I van et ai., 1986;Boila and Phillips, 1988;Kreuzer and Kirchgessner, 1990;Dayrell et al 1991). It has been proposed that the ciliate-mediated breakdown of dietary protein results in increased degradation of sulphur-containing amino acids.…”

Section: Protozoa and Rumen Metabolismmentioning

confidence: 99%

The Rumen Microbial Ecosystem

Hobson¹,

Stewart²

1997

353

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Section: Protozoa and Rumen Metabolismmentioning

confidence: 99%

The Rumen Microbial Ecosystem

Hobson¹,

Stewart²

1997

353

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“…Therefore, the lack of differences in the experiment of Kreuzer and Kirchgessner (1990) are not unexpected. Ivan et al (2000a,b) reported that compared with FF sheep, the presence of TF or IS monofauna in the rumen of sheep fed a silage and soybean meal-based diet decreased the duodenal flow of NAN by 22 and 4-6%, respectively.…”

Section: Discussionmentioning

confidence: 92%

“…nated" sheep (not reported) could have been affected by the semi-purified, concentrate-based diets (Franzolin and Dehority 1996), resulting either in low ruminal protozoa concentration or in "nutritional defaunation" of the faunated sheep (see Kreuzer and Kirchgessner 1989). Therefore, the lack of differences in the experiment of Kreuzer and Kirchgessner (1990) are not unexpected.…”

Section: Discussionmentioning

confidence: 98%

“…Because protozoal metabolism of dietary protein is associated with dietary Cu absorption, numerical density of the rumen fauna appears to be an important factor affecting dietary Cu bioavailability. However, Kreuzer and Kirchgessner (1990) reported no effect of protozoa on dietary Cu absorption in sheep employing faecal and urinary collection technique and a diet based on semi-purified concentrate and hay. But, such a technique is not sensitive enough to measure relatively small differences in apparent Cu absorption.…”

Section: Discussionmentioning

confidence: 99%

“…This is due to low daily consumption of dietary Cu (3.5 mg) in comparison with other dietary nutrients, and the relatively low true absorption of trace elements such as Cu (0.5-7.2%; Suttle 1980) and Zn (10.3%;Ivan 1987). Furthermore, most proteins present in the diet of Kreuzer and Kirchgessner (1990) were soluble or of low degradability and, therefore, would not be well metabolized by protozoa (Onodera and Kandatsu 1970;Hino and Russell 1987;Ivan 1989;Ivan et al 1991) to generate an effect on Cu solubility and absorption. In addition, the rumen protozoa concentrations in "fau- For personal use only.…”

Section: Discussionmentioning

confidence: 99%

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Comparison of effects of Isotricha monofauna and total mixed fauna on dietary copper metabolism in lambs

Entz¹

2007

Can. J. Anim. Sci.

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Ivan, M. and Entz, T. 2007. Comparison of effects of Isotricha monofauna and total mixed fauna on dietary copper metabolism in lambs. Can. J. Anim. Sci. 87: 401-405. Three groups of 15 fauna-free (FF) lambs each were used to establish the effects of Isotricha sp. (IS) monofauna on the dietary copper (Cu) solubility in the stomach and on the concentration of Cu in the liver. One group remained FF (control) while the second and third groups were inoculated with IS and total mixed fauna (TF), respectively. All lambs were fed ad libitum a corn silage based diet for 168 d. Thereafter, the lambs were killed and livers, kidneys and stomachs were removed and sampled. Different fauna treatments did not affect (P > 0.1) growth performance parameters. In comparison with the FF sheep, both the TF and IS decreased (P < 0.05) the rumen solubility of Cu, but the decrease by IS (23%) was approximately half of that of TF (41%; P < 0.05). Similarly, TF and IS decreased the liver Cu concentration by 15% (P < 0.1) and 7.5% (P > 0.1), respectively. Although TF that significantly decreased the bioavailability of dietary Cu included IS and Dasytricha species, it appears that an absence of these Holotrich protozoa from the rumen protozoa population would not have a significant effect on the efficiency of the population to alleviate chronic copper toxicity in sheep. . Les agneaux ont ensuite tous reçu à satiété une ration d'ensilage de maïs pendant 168 jours, au terme desquels ils ont été sacrifiés. Les auteurs ont prélevé et échantillonné le foie, les reins et l'estomac. Les diverses microflores n'ont aucune incidence (P > 0,1) sur les paramètres de la croissance. Comparativement au groupe témoin, on note une diminution (P < 0,05) de la solubilité du Cu dans le rumen des agneaux IS et TF, mais cette baisse est environ deux fois plus importante chez les sujets TF (41 %; P < 0,05) que chez les agneaux IS (23 %). Pareillement, la concentration de Cu dans le foie diminue de 15 % (P < 0,1) chez les agneaux TF et de 7,5 % (P > 0,1) chez les sujets IS. Même si la microflore du traitement TF qui diminue sensiblement l'assimilation du Cu des aliments renferme les espèces des genres Isotricha et Dasytricha, il semble que l'absence de ces protozoaires holotriches dans la population du rumen n'ait pas d'incidence notable sur la capacité de la microflore d'atténuer une intoxication chronique au cuivre chez les ovins.

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