The development of plant components in isogenic sterile and fertile forage maize and their effects on carbohydrate composition, nutritive value, <i>in vivo</i> digestibility values and animal performance with fresh and ensiled crops

Phipps, R. H.; McAllan, A. B.; Weller, R. F.

doi:10.1017/s0021859600042799

Cited by 11 publications

(3 citation statements)

References 14 publications

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“…The changes in the soluble sugar and starch concentrations follow a similar pattern to those reported in other studies on forage maize (Phipps et al 1984). The higher concentration of soluble sugar and lower concentration of starch in the bm 3 plants are probably due to the later maturity of the bm, plants.…”

Section: Discussionsupporting

confidence: 86%

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The nutritive value of normal and brown midrib-3 maize

Weller¹,

Phipps²,

Griffith³

1984

J. Agric. Sci.

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SummaryNormal and brown midrib-3 (bm3) maize plants of three genotypes (Inra 188, Inra 240 and Inra 258) were sampled at three stages of maturity. Whole crop and plant components were analysed for in vitro digestible organic matter in the dry matter (DOMD) and the concentration of neutral detergent fibre, cellulose, hemicellulose, xylose, soluble sugars, starch and total nitrogen in the dry matter.The concentrations of total nitrogen, neutral detergent fibre, cellulose, hemicellulose and xylose were similar in both normal and bm3 plants. Xylose was the main constituent sugar of hemicellulose forming 70–75% of the total hemicellulose. The higher concentration of soluble sugars and lower concentration of starch in the bm3 plants was attributed to the later maturity of the bm3 plants.The bm3 gene significantly reduced lignin synthesis in the whole plant and plant components at all harvests. The mean concentration of lignin in the normal and bm3 plants were 2·2 and 1·4%, respectively. The ferulic and p-coumaric acid concentrations in the bm3 plants were 1·31 and 0·93 mg/g D.M. compared with 1·59 and 1·16 mg/g D.M. for the normal plants, respectively.The in vitro DOMD values for the bm3 plants were significantly higher (P < 0.05) than their normal counterparts.

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Section: Discussionsupporting

confidence: 86%

“…(DOMD) and the concentration of neutral detergent fibre (NDF), cellulose, hemicellulose, xylose, lignin, starch, soluble sugars and total nitrogen in the D.M. by methods already described by Phipps, McAllan & Weller (1984). The cinnamic acid concentration (ferulic and p-coumaric) of the samples was determined by gas liquid chromatography.…”

Section: Methodsmentioning

confidence: 99%

The nutritive value of normal and brown midrib-3 maize

Weller¹,

Phipps²,

Griffith³

1984

J. Agric. Sci.

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“…contents were determined by oven drying. Dried samples of feeds and faeces were analysed for CWC, ADF, cellulose, hemicellulose, lignin, total nitrogen and ash by methods already described by Phipps, McAllan & Weller (1984).…”

Section: Ttstttj Ntyttpttommentioning

confidence: 99%

The feeding value of normal and brown midrib-3 maize silage

Weller¹,

Phipps²

1986

J. Agric. Sci.

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SUMMARYNormal and brown midrib-3 (bm3) maize silages were fed to sheep, lactating cows and dairy calves to determine the effect of the bm3 gene on in vivo digestibility, dry-matter intake and animal performance.In two trials wether sheep were fed either normal or bm3 maize silage at maintenance level. In the first experiment the bm3 gene significantly increased the digestibility of the organic matter(OM), cell wall constituents (CWC), acid-detergent fibre (ADF), cellulose and hemicellulose from 76·9, 74·7, 67·3, 74·2 and 79·5% to 79·6, 79·2, 75·8, 80·8 and 81·5%. In the second experiment the gene increased the digestibility of the OM, CWC, ADF and cellulose from 65·9, 44·7, 28·5 and 38·7% to 701, 59·3, 560 and 66·1, 39·1,32·8, 40·4 and 45·5% to 68·1, 51·9, 53·7, 58·0 and 49·2%. The digestibility of the protein was similar for both diets.In a feeding trial 6-month-old calves were fed either normal or bm3 silage ad libitum together with 1·6 kg D.M. of a protein supplement. The dry-matter intake of the two silages was similar; however, the daily live-weight gain of 0·92 kg for calves fed the bm3 diet was significantly higher than the 0·83 kg for calves fed the normal diet.

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The newly extended maize internode: A model for the study of secondary cell wall formation and consequences for digestibility

Scobbie¹,

Russell²,

Provan³

et al. 1993

J Sci Food Agric

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Abstract:The upper five internodes were collected from maize (Zea mays L) inbred cell lines Co125 and W401 harvested at the same developmental stage, 5 days after silking. Each internode was dissected into ten equal lengths labelled A (top) to J (base). The youngest cells were found in section J, which contained the intercalary meristem, and the oldest in section A. Internodes 1, 3 and 5 provided material for chemical analysis and internodes 2 and 4 for degradability measurements. Cell wall material accounted for one-third of dry matter in section J, doubling to two-thirds in the upper half of each internode. Only section J exhibited a polysaccharide profile typical of primary cell walls. In all other sections, 1,Clinked glucose (-46 % of cell wall) and xylan largely free from side chains (-25% of cell wall) predominated. Net accretion of cell wall polysaccharide reached a maximum by segment G and thereafter little additional carbohydrate was deposited. Lignification appeared to be separated from the biogenesis of structural carbohydrate and continued over much of each internode reaching a maximum in section C. Degradability measurements, made using a modified neutral-detergent cellulase digestibility method, showed substantial differences between sections. In line Co125, cell wall degradability fell from over 95 % in the youngest section (J) to approximately 24 % in section B. Internode 4 of line W401 failed to show the same pattern of degradabilities, probably because of a sequential rather than simultaneous pattern of internode elongation. Saponifiable p-coumaric acid appeared to provide a more sensitive marker than lignin of the extent of secondary wall development. The inverse relationship between extent of lignification in each section and its degradability confirmed the value of the internode model for the study of secondary wall formation and its biological consequences.

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The development of plant components in isogenic sterile and fertile forage maize and their effects on carbohydrate composition, nutritive value, in vivo digestibility values and animal performance with fresh and ensiled crops

Cited by 11 publications

References 14 publications

The nutritive value of normal and brown midrib-3 maize

The nutritive value of normal and brown midrib-3 maize

The feeding value of normal and brown midrib-3 maize silage

The newly extended maize internode: A model for the study of secondary cell wall formation and consequences for digestibility

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