Factors affecting the nutritive value of grass silages, with special reference to protein nitrogen
dc.contributor.advisor
Henderson, A. R.
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dc.contributor.author
Prashad, Reginald
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dc.date.accessioned
2025-03-18T15:39:18Z
dc.date.available
2025-03-18T15:39:18Z
dc.date.issued
1982
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dc.description.abstract
Factors affecting the nutritive value of silage were highlighted, in the Literature Review, along with silage biochemistry, additives, protein metabolism in the ruminant and the nylon bag technique.
The nutritive value of two silages (made from second-cut Perennial and Italian ryegrass), one pretreated with 6.0 It⁻¹ formic acid before ensiling (s) and the other with 7-5 It⁻¹ formalin (F), was assessed.
In Experiment 1, the two grass silages and a control complete ruminant diet (C.R.D.) were offered ad libitum to 2I4 Crossbred lambs. C.R.D. had a significantly greater (p< 0.001) daily DMI than the two silages between which there was no significant difference in intake. The high intake of C.R.D. was attributed to its high concentrate content and its pelleted form and explained the significantly higher (P< 0.001) liveweight gains than from the silage diets. The silages did not differ significantly in liveweight gain. Silage F and C.R.D. had higher efficiency of feed conversion (P< 0.0^) than Silage S.
In Experiment 2, 12 Crossbred lambs were randomly allocated to the three diets and fed in metabolism cages. Silage S had similar apparent digestibility coefficients to an untreated control, but Silage F had lower apparent digestibility coefficients for 0M, DM energy and crude protein. The latter was significantly lower than those of the two other diets. C.R.D. had significantly higher CP digestibility than Silage F and significantly greater N retention than F and S, but was lower in all other parameters, due to its high straw content. Silage F displayed better efficiency of nutrient utilization than Silage S.
In Experiment 3, the two silages and an untreated control silage were incubated in artificial fibre bags in the rumen for 1, 4, 12, 24.
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dc.identifier.uri
https://hdl.handle.net/1842/43223
dc.identifier.uri
http://dx.doi.org/10.7488/era/5764
dc.publisher
The University of Edinburgh
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dc.relation.isreferencedby
Already catalogued
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dc.subject
Annexe MSc Digitisation Project 2022 Block 50
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dc.subject
Nutritive value
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dc.subject
Silage
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dc.subject
Protein nitrogen
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dc.subject
Digestibility
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dc.subject
Ruminant
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dc.title
Factors affecting the nutritive value of grass silages, with special reference to protein nitrogen
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dc.type
Thesis or Dissertation
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dc.type.qualificationlevel
Masters
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dc.type.qualificationname
MSc Master of Science
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