Genetic variation in rate and extent of the in situ cell wall degradation of maize stalks at silage harvest time

Barrière, Yves; Tovar-Gomez, M. R.; Émile, J. C.; Sauvant, Daniel

doi:10.1051/agro:19980808

Cited by 3 publications

(2 citation statements)

References 25 publications

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“…According to Minson and Wilson [142], Blaxter et al [44] first reported that voluntary intake was positively correlated with digestibility, and Hawkins et al [115] reported that voluntary intake was negatively correlated with lignin content. The rate of NDF degradation, measured in situ in fistulated animals, varied very significantly among genotypes [38,124]. Such a trait should be considered as being possibly related to a genotype's rumen-filling capacity, and as a consequence, to genotype ingestibility.…”

Section: Devising a Breeding Criterion For Genetic Improvement Of Ingmentioning

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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Section: Devising a Breeding Criterion For Genetic Improvement Of Ingmentioning

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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“…Silomaisreife (Haarhoff 1990) erreicht. Daraus ergibt sich die generelle Forderung, Sorten anzubauen, die einen höheren Anstieg in der Korn-TM bei gleichzeitig verzö-gerter Restpflanzenabreife ermöglichen (Hunter 1979 (Orth u. Kaufmann 1961;Giesecke u. Tiews 1966;Hunter 1979;Verasilp 1986;Hunt et al 1989;Südekum 1989;Argillier et al 1998;Barriere et al 1998;Casper et al 1999;Bal et al 2000;Tolera u (Waldo 1973;Sutton 1985;Orskov 1986;Cronje 2000;Hindle et al 2005). Der Nutzung der Bypass-Stärke sind dabei Grenzen gesetzt, die durch eine unzureichende Stärkeverdauung, begrenzte Glukoseabsorption, mikrobielle Fermentation der Glucose im Dünndarm, weitgehende Verstoffwechselung absorbierter Glucose im Darmepithel und einen begrenzten Glucosetransport zu den Zielorganen begründet werden (Matthe 2001).…”

Section: Abreife Erntestrategie Und Züchtungszielunclassified

Contribution to product safety of silage maize by differential pre-harvest measurement

Amler¹

2006

Gesunde Pflanzen

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Prediction of aspects of neutral detergent fibre digestion of forages by chemical composition and near infrared reflectance spectroscopy

Andrés

Giráldez

González

et al. 2005

Aust. J. Agric. Res.

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Sixty-two herbage samples, harvested in natural meadows located in the mountains of León (north-west Spain), and characterised by a diverse botanical composition and different stages of maturity of the plants, were used to evaluate the ability of chemical composition and near infrared (NIR) spectroscopy to predict in vitro digestibility and in sacco degradability of the neutral detergent fibre (NDF) fraction. In vitro digestibility was performed as described by the Goering and Van Soest procedure. Three dry Holstein-Friesian cows fitted with a rumen cannula were used to incubate the herbage samples. A Bran+Luebbe InfraAlyzer 500 spectrophotometer was used to obtain the NIR spectra corresponding to the 62 original herbage samples. Prediction equations for the estimation of in vitro digestibility and in sacco degradability parameters of the NDF fraction were generated using NIR spectra or chemical data as independent variables. The results showed that the in vitro digestibility and kinetic parameters of degradation of the NDF fraction could not be predicted accurately, probably as a consequence of the errors corresponding to the reference methods. In contrast, these errors did not greatly affect the extent of disappearance of the NDF fraction at later times, so the accuracy of prediction of these parameters was higher, especially when NIR spectra were used as independent variables. This is probably due to the close relationship that the parameters showed with the chemical data, since this kind of information, together with some physical characteristics of the samples, is included in the NIR spectra.

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Genetic variation in rate and extent of the in situ cell wall degradation of maize stalks at silage harvest time

Cited by 3 publications

References 25 publications

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

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

Contribution to product safety of silage maize by differential pre-harvest measurement

Prediction of aspects of neutral detergent fibre digestion of forages by chemical composition and near infrared reflectance spectroscopy

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