Phenotypic variation for in sacco dry matter and fibre degradation kinetics in lucerne

Julier, Bernadette; Émile, J. C.; Lila, M.; Huyghe, C.

doi:10.1071/ar99147

Cited by 5 publications

(1 citation statement)

References 31 publications

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“…Previously, hybrid vigour captured in alfalfa semi-hybrids has been exploited to increase yield and this procedure is currently being used to address digestibility issues (Riday et al, 2002). Genetic variation exists for digestibility and by inference for cell wall composition (Julier et al, 2001). Analysis of QTL in maize revealed distribution of markers for nutritive value throughout the genome .…”

Section: Carbohydrates and Cell Wallsmentioning

confidence: 99%

Strategies of plant breeding for improved rumen function

Kingston‐Smith

Thomas

2003

Annals of Applied Biology

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Kingston-Smith, A. H., Thomas, H. M. (2003). Strategies of plant breeding for improved rumen function. ? Annals of Applied Biology, 142, (1), 13-24. Sponsorship: BBSRC; DEFRAIn general, breeding programmes directed at the improvement of forage have concentrated on easily measurable phenotypes such as yield, digestibility, resistance to lodging, etc. Selection programmes have improved forage production but historically have addressed relatively few quality considerations. In addition, selection for quality has been limited by availability of suitable analytical techniques. With the current emphasis on quality rather than quantity and the desire by the public for greater understanding about where their food comes from, quality considerations should be a greater target in future breeding programmes. This review briefly covers previous improvements in quality of grazed and silage forages and considers how new technologies might be employed to realise targets for future improvements. In particular we address the concept that interactions between rumen micro-organisms and ingested plant material in the rumen are not static but are in fact dynamic. This has implications for post-ingestion biology and feed utilisation.Peer reviewe

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Section: Carbohydrates and Cell Wallsmentioning

confidence: 99%

Strategies of plant breeding for improved rumen function

Kingston‐Smith

Thomas

2003

Annals of Applied Biology

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Supplementing steers up to 43 % canola meal had no negative effects on either ruminal parameters or the degradation characteristics of lucerne hay

Lynch,

Krebs,

Piltz

et al. 2025

Livestock Science

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Variation in protein degradability in dried forage legumes

et al. 2003

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-Proteins in forage legumes are rapidly degraded in the rumen, inducing a poor dietary protein efficiency, risk of bloat, and nitrogen loss detrimental to the environment. The aim of this study was to investigate the variation in ruminal protein degradability among legume species and cultivars. Four species, each represented by 1 to 16 cultivars, were studied: lucerne (Medicago sativa), white clover (Trifolium repens), birdsfoot trefoil (Lotus sp.) and crownvetch (Coronilla varia). In a first experiment, forage samples of 16 cultivars of lucerne harvested in the autumn of 1998 were incubated in nylon bags in 3 fistulated cows in order to obtain the kinetics of ruminal degradation of crude protein and dry matter. The phenotypic variation in crude protein degradation was not significant, and was partly related to the dry matter degradation. In a second experiment, lucerne (5), birdsfoot trefoil (5), white clover (4) and crownvetch (1) cultivars were harvested in two cuts in 2000, and dry matter and crude protein degradation were analysed at 3 incubation times (2, 8 and 48 h) in the rumen of the fistulated cows. Crude protein degradation was higher for lucerne than for white clover, and these two tannin-free species exhibited greater crude protein degradation than crownvetch and birdsfoot trefoil. In birdsfoot trefoil, crude protein degradation was negatively correlated to condensed tannin content but positively correlated to dry matter degradation. Except for birdsfoot trefoil, the range of genetic variation within species for in situ crude protein degradation was low. des échantillons de 16 variétés de luzerne récoltés durant l'automne 1998 ont été introduits dans des sachets de Nylon et placés dans le rumen de trois vaches fistulées pour obtenir la cinétique de dégra-dation ruminale des protéines et de la matière sèche. La variabilité phénotypique pour la dégradabilité des protéines n'était pas significative, et elle était en partie reliée à la dégradation de la matière sèche. Dans une seconde expérience, des variétés de luzerne (5), de lotier corniculé (5), de trèfle blanc (4) et de coronille (1) ont été récoltés en deux coupes en 2000, et les dégradations des protéines et de la matière sèche ont été analysées à trois temps d'incubation (2, 8 et 48 h) dans le rumen de vaches fistulées. La dégradation des protéines était plus élevée pour la luzerne que pour le trèfle blanc, et ces deux espèces sans tannin avaient une plus forte dégradation des protéines que le lotier et la coronille. Pour le lotier, la dégradation des protéines était corrélée négativement à la teneur en tannins condensés, mais corrélée positivement à la dégradation de la matière sèche. A l'exception du lotier, la variabilité à l'intérieur d'une espèce pour la dégradabilité des protéines in situ était faible. dégradation des protéines / dégradation de la matière sèche / Medicago sativa / Lotus sp. / Trifolium repens / Coronilla varia

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Phenotypic variation for in sacco dry matter and fibre degradation kinetics in lucerne

Cited by 5 publications

References 31 publications

Strategies of plant breeding for improved rumen function

Strategies of plant breeding for improved rumen function

Supplementing steers up to 43 % canola meal had no negative effects on either ruminal parameters or the degradation characteristics of lucerne hay

Variation in protein degradability in dried forage legumes

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