Studies on the Use of Hulless Barley in Chick Diets: Deleterious Effects and Methods of Alleviation

Classen, H. L.; Campbell, Graham; Rossnagel, B. G.; Bhatty, R. S.; Reichert, R.D.

doi:10.4141/cjas85-085

Cited by 85 publications

(49 citation statements)

References 6 publications

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“…This was attributed to fat malabsorption induced by feeding rye, barley, or oats (Campbell et al 1983a (Classen et al 1985). This is reflected in a substantially reduced metabolizable energy that is correctable with enzyme supplementation (Rotter et al 1990a (Gohl and Gohl 1977), increased digesta viscosity.…”

Section: Pentosans As Growth-depressantsmentioning

confidence: 99%

Enzyme applications for monogastric feeds: A review

Campbell¹,

Bedford²

1992

Can. J. Anim. Sci.

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256

118

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Section: Pentosans As Growth-depressantsmentioning

confidence: 99%

Enzyme applications for monogastric feeds: A review

Campbell¹,

Bedford²

1992

Can. J. Anim. Sci.

Self Cite

256

118

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“…These problems have been attributed to mixed-linked (l-3)(l-q-f-Dglucans in the endosperm cell wall of barley and known to increase the viscosity of intestinal contents (White et al 1981). Treating diets containing barley with crude enzymes has reduced their viscosity and improved chick performance (Classen et al 1985;Campbell et al 1986;Hesselman and Aman 1986;Rotter et al 1989).…”

mentioning

confidence: 99%

In Vitro Viscosity Measurements of Barley Extracts as Predictors of Growth Responses in Chicks Fed Barley-Based Diets Supplemented With a Fungal Enzyme Preparation

Rotter¹,

Marquardt²,

Guenter³

et al. 1989

Can. J. Anim. Sci.

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( < 0.5-mm-mesh screen). When the three extracting methods were compared, method I gave higher readings than method II for high-viscosity barleys, and the reverse was true for low-viscosity barleys. The ranking of the barleys remained the same. Method III gave the lowest viscosity values, perhaps due to active endogenous B-glucanases in water extracts of the raw barley. When different barley cultivars were extracted by method I and subjected to different shear rates the viscosity differences were much more pronounced at the lower shear rates, particularly for high-viscosity barleys. Finally, the same seven barleys were compared in a feeding trial with chickens. The improvement in weight gain due to supplementation with a crude enzyme preparation from Trichoderma viride (Cellulase Tv) ranged from 2 to 4l% (P <0 .05). Similar improvements were obtained for feed consumption, feed-to-gain ratio and dry matter retention (P < 0.05). The highest simple correlation coefficients were between the viscosity of barleys that had been extracted by method I, measured at low shear rates, and relative weight gain (r : 0 .97 , week I plus week 2). The correlation coefficients using low shear rate data were slightly higher than those with high shear rate data.These results indicate that most pronounced differences among barleys were obtained with finely ground samples (<0.5 mm), extracted for one hour at 38'C, using a low pH 1.5 buffer (method I) and assayed at low shear rates. Under these conditions the viscosity data reflected the antinutritive properties of barley, which in turn were reduced or abolished by adding a crude enzyme preparation to the diet.

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“…Their role in malting and brewing has been reviewed by Bamforth (1982) and in feed barley by Bhatty (1986). Although p-glucans can be completely broken down and rendered harmless for poultry feeding by treatment of barley with specific p-glucanases or by gamma irradiation (Classen et al 1985), the ultimate solution to their removal lies in genetic manipulations. Several genotypes of barley low in B-glucan have been identified (Aastrup 1983).…”

mentioning

confidence: 99%