Valeur Alimentaire Du Maïs Fourrage. I. — Composition Chimique Et Digestibilité Du Maïs Sur Pied

Demarquilly, C.; Aubry, Jacqueline; Boissau, J.-M.

doi:10.1051/animres:19690102

Cited by 20 publications

(11 citation statements)

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“…The in vivo digestibility ofDM ofthe silages declined between the second ani final harvests in all years as did animal gain in years I and 3. The This agrees with the observations of Demarquilly (1969) in France and Daynard and Hunter (1915) in Ontario where temperatures would not be expected to be high during the corn maturation period. Cummins (1970) …”

supporting

confidence: 91%

“…The in vivo digestibility ofDM ofthe silages declined between the second ani final harvests in all years as did animal gain in years I and 3. The The optimum time to harvest whole plant corn (Zea mays L.) is when the dry matter mature corn) the DM yield may be lower (Daynard and Hunter 1975), and the DM intake per day by animals may be reduced (Waldern 19'12 Schaadt and Johnson (1968) This agrees with the observations of Demarquilly (1969) in France and Daynard and Hunter (1915) in Ontario where temperatures would not be expected to be high during the corn maturation period. Cummins (1970) showed that the climate during maturation did affect the digestibility of components of the corn plant.…”

supporting

confidence: 75%

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Feeding Value for Beef Steers of Corn Silage as Affected by Harvest Dates and Frost

Calder¹,

Langille²,

Nicholson³

1977

Can. J. Anim. Sci.

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. l9j'7. Feeding value for beef steers of corn silage as affected by harvest dates and frost. Can. J. Anim. An experiment was conducted in 3 consecutive yr with corn grown each year on a field from which silage was made of corn harvested at different dates before and after freezing. Yields of green and dry weight were recorded at each harvest.Individual whole plants and ptant parts were evaluated for dry matter (DM), total nitrogen, total available carbohydrates and in vitro digestibility of DM. Animal gains, feed consumption and carcass grades were determined by feeding the silages to yearling Hereford steers and DM digestibility determined with sheep. The total yield and contribution of the ear increased from the first to the second harvestins date. The in vivo digestibility ofDM ofthe silages declined between the second ani final harvests in all years as did animal gain in years I and 3. The This agrees with the observations of Demarquilly (1969) in France and Daynard and Hunter (1915) in Ontario where temperatures would not be expected to be high during the corn maturation period. Cummins (1970)

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supporting

confidence: 91%

supporting

confidence: 75%

Feeding Value for Beef Steers of Corn Silage as Affected by Harvest Dates and Frost

Calder¹,

Langille²,

Nicholson³

1977

Can. J. Anim. Sci.

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“…As for other forage crops, maize digestibility is closely linked (R = 0.98) to its undigestible cell wall content. In contrast, the digestibility of maize cell walls is not only independent of their content in the plant but also lower than that of other forage crops (-10 Andrieu, 1975 (Andrieu, 1976) (Demarquilly, 1969), a close inverse relation exists between these 2 constituents:…”

mentioning

confidence: 89%

Composition and nutritive value of whole maize plants fed fresh to sheep. I. Factors of variation

Andrieu¹,

Demarquilly²,

Dardenne³

et al. 1993

Ann. Zootech.

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Summary — The composition and digestibility by sheep of 15 commercial maize varieties and 1 brown mid-rib experimental hybrid was measured over 2 yr in 7 locations, according to earliness as fresh-cut forage from the milky stage of the grain to the glazed stage. This study determined the effect of the main factors causing variations in plant composition and digestibility. Under satisfactory growing conditions, the digestibility of a given maize hybrid increases significantly with growth stage, whereas it changes very little under poor conditions (low temperatures, drought, etc). For a given dry matter content, genotype effects were significant in only 2 locations and were of similar importance to those of environment (location and year) on a given genotype. As for other forage crops, maize digestibility is closely linked (R = 0.98) to its undigestible cell wall content. In contrast, the digestibility of maize cell walls is not only independent of their content in the plant but also lower than that of other forage crops (-10

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“…Most often, work has been devoted to studies of whole plant digestibility, and only few studies have investigated cell wall digestibility. The first digestion trials in Europe with ensiled forage maize seem to be those of Dijktra and Becker ( [87], quoted in [81]) in the Netherlands, and those of Demarquilly [83], and Andrieu and Demarquilly [8], in France. From 25 measurements reported by Deinum et al [81], OMD of silage maize had an average value of 72.8%.…”

Section: In Vivo Genetic Variation For Cell Wall Digestibility In Maizementioning

confidence: 99%

Genetic variation and breeding strategies for improved cell wall digestibility in annual forage crops. A review

et al. 2003

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-Forage plants are the basis of ruminant nutrition, and cell wall digestibility is the limiting factor of their feeding value. Cell wall digestibility is therefore "the" target for improving the feeding value of forage crops. Among annual forages, maize cropped for silage making is the most widely used, and much research in genetics, physiology and molecular biology of annual forages is devoted to maize. Sorghum, immature small grain cereals and straws of small grain cereals are also given to cattle. Some dicotyledons are or were also used, such as forage beets, kales, canola in temperate areas and amaranths in tropical and subtropical areas. Large genetic variation for cell wall digestibility was proved from both in vivo and in vitro experiments in numerous species. Among the regular maize hybrids (excluding brown-midrib ones), the NDF in vivo digestibility nearly doubled from 32.9 to 60.1%. Correlations between in vivo and in vitro estimates of cell wall digestibility were often close to 0.75, but in vitro estimates of cell wall digestibility significantly reduced the range of variation between genotypes. Despite lignin content is well known as the major factor making cell wall undigestible, breeding for a higher digestibility of plant only from a lignin content trait appeared impossible. Correlations between lignin content and cell wall digestibility were indeed greatly variable according to the genetic background. Moreover, enzymatic solubilities were excessively dependent on lignin, and correlation between in vivo estimates of cell wall digestibility and lignin content were always lower than correlation between in vitro estimates of cell wall digestibility and lignin content. Among brown-midrib genes, the bm3 mutant in maize, and the bmr12 (and possibly bmr18) mutant in sorghum, which are both altered in the COMT activity, appeared as the most efficient in cell wall digestibility improvement. Moreover, a great genetic variation in the efficiency of the maize bm3 gene for cell wall digestibility improvement was observed according to the genetic background, with a lower efficiency when the normal germplasm was of better cell wall digestibility. Efficient breeding maize and others annual forage plants demands a renewing of genetic resources. Because resources of interest in cell wall digestibility improvement could be of poor agronomic value, the best is likely to cell wall digestibility / ingestibility / annual forage / maize / genetic variation / breeding / lignin Résumé -Amélioration de la digestibilité des parois des fourrages annuels. Les plantes fourragères sont à la base de l'alimentation des ruminants, mais leur valeur nutritive est limitée par la digestibilité variable des parois végétales, dont l'amélioration est alors la cible essentielle des programmes de sé-lection. Parmi les fourrages annuels, le maïs est la plante la plus cultivée, et c'est sur cette espèce que porte l'essentiel de la recherche en génétique, physiologie et biologie moléculaire. Toutefois, le sorgho, les céréales à paill...

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Valeur Alimentaire Du Maïs Fourrage. I. — Composition Chimique Et Digestibilité Du Maïs Sur Pied

Cited by 20 publications

References 1 publication

Feeding Value for Beef Steers of Corn Silage as Affected by Harvest Dates and Frost

Feeding Value for Beef Steers of Corn Silage as Affected by Harvest Dates and Frost

Composition and nutritive value of whole maize plants fed fresh to sheep. I. Factors of variation

Genetic variation and breeding strategies for improved cell wall digestibility in annual forage crops. A review

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