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Title: The consequences of ensiling grass with absorbent materials
Author: al-Rwidah, Mohammed Nassir
ISNI:       0000 0001 3408 1783
Awarding Body: University of Glasgow
Current Institution: University of Glasgow
Date of Award: 1987
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The literature in the following areas is reviewed: a) Factors affecting animal performance from silage based diets: Silage fermentation, Silage voluntary intake. Silage nutritive value and supplementation of silage diets. b) Losses of nutrients in silage making c) The chemistry of silage effluent d) The control of silage effluent Ensilage experiments using 200 1 drum silos (experiments 1 and 2a) were carried out to compare the effluent-absorbing characteristics of a range of absorbent materials and to measure their effects on silage composition. The results showed that none of the absorbents tested markedly affected silage preservation. Chopped barley straw, Vitaferm (a dried distillery by-product) and molassed sugar beet shreds proved the most effective controllers of silage effluent. Experiment 2b (also using drum silos) investigated the relationship between effluent volume, grass dry matter content and the concentration of molassed sugar beet shreds ensiled with the grass. Molassed sugar beet shreds inclusion improved silage intake and animal performance but may not greatly reduce nutrient losses in effluent (and therefore pollution risk) unless used in sufficient quantity totally to prevent effluent loss. For grass of 180 gkg-1 dry matter content an -1 -1 inclusion rate of 80 kgt FW (or 250 kgt dry matter basis) is needed to prevent effluent loss. Chopped straw inclusion reduced silage intake and animal performance but proved the most reliable absorbent for effluent control as nutrient concentration in effluent was unaffected. The silo space required for a given weight of grass was increased by 22% and 79% respectively for molassed sugar beet shreds and chopped straw added at approximately 75 kgt-1 grass FW.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Chemistry of silage feeds