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Chemical processing of wheat straw and cotton by-products for fattening cattle.† 1. Performance of animals receiving the wet material shortly after treatment‡

Published online by Cambridge University Press:  02 September 2010

D. Levy ,
Z. Holzer ,
H. Neumark  and
Y. Folman
D. Levy
Affiliation:
Nve Y'ar Regional Experiment Station and the Volcani Center, Agricultural Research Organization, Haifa, Israel
Z. Holzer
Affiliation:
Nve Y'ar Regional Experiment Station and the Volcani Center, Agricultural Research Organization, Haifa, Israel
H. Neumark
Affiliation:
Nve Y'ar Regional Experiment Station and the Volcani Center, Agricultural Research Organization, Haifa, Israel
Y. Folman
Affiliation:
Nve Y'ar Regional Experiment Station and the Volcani Center, Agricultural Research Organization, Haifa, Israel
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Summary

Two fibrous roughages, wheat straw and cotton hulls, were treated with 0, 40 and 80 g sodium hydroxide (NaOH)/kg roughage, applied in amounts of water calculated to bring the roughages to moisture contents of 30 and 60%. The effects of these factors on the nutritive values of the two roughages were examined using a 2 × 3 × 2 factorial design.

Digestibility trials, in vitro and in vivo, and a 9-mo feeding trial were carried out with the roughages soon after treatment. Concentrates were limited to 6 kg/head per day throughout the animal experiments and roughages were offered ad libitum.

Neutral detergent fibre decreased by 7·8 and 13·5% with the 40 and 80 g application rates of NaOH respectively.

The treatment of both roughages with NaOH increased considerably their in vitro dry matter digestibility and total solubles after enzyme treatment, the increases being related to the rate of application of NaOH. Digestibility in vivo was improved only by the 40 g NaOH treatment.

Treatment with NaOH reduced the voluntary intake of both roughages. Only the 80 g/kg treatment had a positive effect on rate of live- and carcass-weight gain. On the other hand, NaOH improved very significantly the efficiency of conversion of metabolizable energy into live and carcass weight and increased significantly the degree of fatness of the animals. These results indicate a marked improvement in the nutritional value of both roughages due to NaOH treatment. The reason for the small response in rate of gain may be explained by a shortage of protein owing to a possible reduction in its digestibility. Cotton hulls excelled wheat straw in almost every respect. Animals on NaOH-treated cotton hulls bloated chronically unless some long straw was given. Moisture level had practically no effect on performance.

The effects of the treatments on rumen or blood constituents were small.

Type
Research Article
Information
Animal Production , Volume 25 , Issue 1 , August 1977 , pp. 27 - 37
Copyright
Copyright © British Society of Animal Science 1977

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References

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