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Soaking of complete fattening rations high in poor roughage 1. The effect of moisture content and spontaneous fermentation on nutritional value†

Published online by Cambridge University Press:  02 September 2010

Z. Holzer ,
D. Levy ,
H. Tagari  and
R. Volcani
Z. Holzer
Affiliation:
Agricultural Research Organization, Newe Ya'ar Regional Experiment Station, Haifa, Israel
D. Levy
Affiliation:
Agricultural Research Organization, Newe Ya'ar Regional Experiment Station, Haifa, Israel
H. Tagari
Affiliation:
Agricultural Research Organization, Newe Ya'ar Regional Experiment Station, Haifa, Israel
R. Volcani
Affiliation:
Agricultural Research Organization, Newe Ya'ar Regional Experiment Station, Haifa, Israel
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Summary

The effect of three moisture concentrations (10, 50 and 75%) and of four fermentation conditions (none, 24 hr aerobic, and 24 and 48 hr anaerobic) on the nutritive value of two complete fattening diets containing 25 and 45% poor roughage, was examined in three digestion and nitrogen balance trials, each of Latin square design, in cattle.

Fermentation increased the lactic acid and volatile fatty acid concentrations of the feed, decreased its pH and the crude fibre content, and caused losses of dry matter.

There were non-significant differences in voluntary intake between the dry and soaked diets. The apparent digestibility of dry and organic matter, crude protein, nitrogen-free extract and crude fibre was non-significantly improved by added moisture. There were no consistent differences in nitrogen retention.

The average metabolizable energy values (ME) observed for both diets were 6% higher than those calculated. There were no significant differences in the apparent digestibility of gross energy or in ME value between treatments of different moisture content.

The fluctuations in pH of rumen liquor during the day differed markedly when the animals received different levels of roughage. These differences were greater when the feed was allowed to ferment. Soaking of feed resulted in a significant increase in the concentration of propionic acid in the rumen liquor, and a non-significant decrease in that of acetic acid. Consequently the C2/C3 ratio was significantly lower on the moist feed treatments.

There were no consistent differences in concentration of ammonia in the rumen liquor, or of urea in the blood.

Type
Research Article
Information
Animal Production , Volume 21 , Issue 3 , December 1975 , pp. 323 - 335
Copyright
Copyright © British Society of Animal Science 1975

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References

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