Abstract
1. Digestibility of maize stalk from Troyer Reid ( Tr ) maize and its isogenic mutant ( bm 1 ) was studied by suspending nylon bags containing ground tissue in the rumen of a fistulated steer. The animal was given a grass hay–concentrate (5:3) diet or a maize silage–grass hay–concentrate (4:1:3) diet. 2. The digestibility of the organic matter of the mutant maize stalk was greater than that of the normal maize stalk. 3. Adaptation of the rumen to maize silage increased the organic-matter digestibility of the maize stalk. 4. Lignin content was determined by two methods, namely organic matter insoluble in 72% sulphuric acid (method of the Association of Official Agricultural Chemists, 1960) (AOAC-lignin) and the organic matter lost from the ligno-cellulose complex (represented by acid-detergent fibre) by oxidation with potassium permanganate. The AOAC-lignin concentration was twice the permanganate-lignin concentration, but the amount of lignin estimated by both methods showed a significant negative relation to organic-matter digestibility. The AOAC-lignin concentration was greater in Tr than in bm 1 maize but the permanganate-lignin concentration in Tr was slightly lower than in bm 1 . 5. There was an irregular relationship between the amount of lignin extractable with dimethylformamide (DMF) and digestibility of organic matter due to the solution of some of the DMF-lignin during digestion. The loss of lignin was greater from the mutant maize stalk tissue than from the parent maize stalk tissue. 6. The chemical composition of DMF-lignin determined by analysis showed a significant correlation between the syringealdehyde, p -hydroxybenzaldehyde and vanillin concentrations, and digestibility of organic matter. 7. Higher concentrations of both phenolic aldehydes and acids were found in the less digestible Tr material than in the bm 1 stalk tissue.
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Claims 11
Claim · model-written summary
Mutant maize stalk had greater organic-matter digestibility than normal maize stalk.
- Material
- mutant maizee0
- Outcome
- digestibility of the organic mattere0
- Direction
- greatere0
- Comparator
- normal maize stalke0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The digestibility of the organic matter of the mutant maize stalk was greater than that of the normal maize stalk”
Claim · model-written summary
Rumen adaptation to maize silage increased stalk organic-matter digestibility.
- Treatment
- Adaptation of the rumen to maize silagee0
- Outcome
- organic-matter digestibilitye0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Adaptation of the rumen to maize silage increased the organic-matter digestibility of the maize stalk”
Claim · model-written summary
AOAC-lignin concentration was twice permanganate-lignin concentration.
- Outcome
- AOAC-lignin concentratione0
- Direction
- twicee0
- Value
- twicee0
- Comparator
- permanganate-lignin concentratione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The AOAC-lignin concentration was twice the permanganate-lignin concentration”
t0“maize plant lignin”
Claim · model-written summary
Lignin by both methods was negatively related to digestibility.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the amount of lignin estimated by both methods showed a significant negative relation to organic-matter digestibility”
t0“maize plant lignin”
Claim · model-written summary
AOAC-lignin concentration was greater in Tr than bm 1 maize.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The AOAC-lignin concentration was greater in Tr than in bm 1 maize”
Claim · model-written summary
Permanganate-lignin concentration was slightly lower in Tr than bm 1.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the permanganate-lignin concentration in Tr was slightly lower than in bm 1”
t0“maize plant lignin”
Claim · model-written summary
DMF-extractable lignin had an irregular relation to digestibility.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was an irregular relationship between the amount of lignin extractable with dimethylformamide (DMF) and digestibility of organic matter”
t0“maize plant lignin”
Claim · model-written summary
Lignin loss was greater from mutant stalk than parent stalk.
- Material
- mutant maizee0
- Outcome
- loss of lignine0
- Direction
- greatere0
- Comparator
- parent maize stalk tissuee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The loss of lignin was greater from the mutant maize stalk tissue than from the parent maize stalk tissue”
Claim · model-written summary
Syringealdehyde, p-hydroxybenzaldehyde and vanillin concentrations correlated significantly with digestibility.
- Compound
- syringealdehyde, p -hydroxybenzaldehyde and vanilline0
- Outcome
- digestibility of organic mattere0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“showed a significant correlation between the syringealdehyde, p -hydroxybenzaldehyde and vanillin concentrations, and digestibility of organic matter”
t0“maize plant lignin”
Claim · model-written summary
Phenolic aldehyde concentrations were higher in less digestible Tr than bm 1.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Higher concentrations of both phenolic aldehydes and acids were found in the less digestible Tr material than in the bm 1 stalk tissue”
t0“maize plant lignin”
Claim · model-written summary
Phenolic acid concentrations were higher in less digestible Tr than bm 1.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Higher concentrations of both phenolic aldehydes and acids were found in the less digestible Tr material than in the bm 1 stalk tissue”
t0“maize plant lignin”
The same questions in other papers
processing · quality: grain · Zea mays (maize)Positive and negative results
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See all 23 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.