Etude de la valeur agronomique en plante entière au stade de récolte ensilage de différentes variétés de maïs grain sélectionnées entre 1950 et 1980

Barrière, Yves; Galláis, A.; Derieux, M.; Panouillé, A.

doi:10.1051/agro:19870201

Cited by 7 publications

(4 citation statements)

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“…Stover dry matter yield has increased at a slower rate of 0.043 to 0.054 Mg ha −1 yr −1 Forage, stover and ear yield have increased from 1930 levels at the rate of 1.4, 0.7 and 2.4% yr −1 , respectively. Other workers have reported forage yield increases of 0.5% yr −1 (Meghji et al, 1984) and −0.1 to 0.6% yr −1 or −0.02 to 0.08 Mg ha −1 yr −1 (Barriere et al, 1987).…”

Section: Resultsmentioning

confidence: 97%

Forage Yield and Quality of Corn Cultivars Developed in Different Eras

Lauer¹,

Coors²,

Flannery³

2001

Crop Science

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Gains in corn (Zea mays L.) grain yield over time are well documented, but corresponding changes in forage and stover yield and quality have received less attention. Our objective was to describe yield and quality changes of representative cultivars used by farmers in the northern Corn Belt. Six open‐pollinated cultivars used prior to 1930, 24 cultivars representing four 15‐yr eras between 1931 and 1990, and six modern cultivars, for a total of 36 cultivars, were divided into early‐ and late‐maturity trials. Each trial was grown at three locations in Wisconsin during 1997 and 1998. Since 1930, corn forage dry matter yield has increased at the rate of 0.128 to 0.164 Mg ha−1 yr−1 with stover dry matter yields increasing at the rate of 0.043 to 0.054 Mg ha−1 yr−1 Forage crude protein has not changed significantly with time. Forage neutral detergent fiber concentration has decreased 0.825 to 0.948 g kg−1 yr−1, while forage in vitro digestibility increased 0.538 to 0.612 g kg−1 yr−1 Stover neutral detergent fiber concentration and in vitro digestibility have not changed over time. Since 1930 forage, stover, and ear yield have increased 1.4, 0.7, and 2.4% yr−1, respectively. This trend will no doubt continue, but greater progress might be made if corn forage breeding improvement concentrates on yield and quality changes in stover.

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Section: Resultsmentioning

confidence: 97%

Forage Yield and Quality of Corn Cultivars Developed in Different Eras

Lauer¹,

Coors²,

Flannery³

2001

Crop Science

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“…Tremendous improvements in maize yield, yield regularity, stalk standability, stalk rot resistance and stay-green have been achieved in the last five decades in Europe [32,86], and in the last century in the USA [161,175,176]. In forage maize [29], the genetic progress was found to be close to 0.17 t·ha -1 ·year -1 for hybrids registered from whole plant experiments in France between 1986 (the first year with registration after forage maize official trials) and 2000.…”

Section: Drift Of Cell Wall Digestibility In Maize and Necessity Of mentioning

confidence: 99%

“…In forage maize [29], the genetic progress was found to be close to 0.17 t·ha -1 ·year -1 for hybrids registered from whole plant experiments in France between 1986 (the first year with registration after forage maize official trials) and 2000. In the period before 1986, whole plant genetic progress was less important in hybrids bred for grain yield, as Inra258 registered in 1958 yielded about 12 t·ha -1 , LG11 registered in 1970 13 t·ha -1 , Dea registered in 1980 15 t·ha -1 , but Anjou285 and Nexxos registered in 1994 and 2000 yielded 18 and 20 t·ha -1 , respectively [29,32]. However, feeding value was not considered for forage maize registration until 1998, and a significant drift of hybrids towards lower in vivo digestibility values was observed in the last two or three decades (Tab.…”

Section: Drift Of Cell Wall Digestibility In Maize and Necessity Of mentioning

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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“…In forage maize (Barrire et al, 1987(Barrire et al, , 2004(Barrire et al, , 2005, the genetic progress was close to 0.17 t/ha/year for hybrids registered in France between 1986. In the period before 1986, forage yield improvement was correlative to the genetic progress in grain and was nearly equal to 0.10 t/ha/year (Barriere et al, 1987).In the USA, Lauer et al (2001) highlighted an annual rate of forage yield increase of 0.13-0.16 t/ha since 1930.The discrepancy between European and US results is likely due to different evolutions of hybrid germplasm in Europe and in the USA.No data are available showing such a drift in maize breeding program in Egypt. However, similar results could be considered because similar progresses in maize use,stalk stand ability and plant type were obtained during the last years.…”

Section: Introductionmentioning

confidence: 96%

Variability in Forage yield of a Silage Maize “Zea mays, L.”Base Population via Two Types of Families

Ahmed

El-Sheikh

M.El-Sayed

et al. 2020

Alexandria Journal of Agricultural Sciences

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The base population for the recent study which is ayellow seed synthetic variety of maize was provided by Dr. M. Abd El-Sattar Ahmed, professor of crop science, Crop Science Department, faculty of Agriculture, Egypt.Two types of families had formulated, as a step before selection for high yielding ability. Those were half-sib (H.S) families and the first generation of self-pollination(S 1 ) families. Variability in the base population gene pool had estimated depending on variance components of the families. The ratio of σ 2 A / σ 2 G indicated that, additive genetic variance was more effective in controlling green and dry forage yield. This might indicate the importance of additive genetic variance in maize population, consequently, selection among inbred-progeny would expect to be superior to other methods under most genetic situations. Reduction in mean values of forage yield associated with selfing, reached 0.62 and 0.57 for green forage yield (Kg/ plot) and dry forage yield (Kg/plot), respectively. Values of genotypic variances estimated from S 1 families were of larger magnitude amounted to 1.63 and 1.94 times the corresponding values for half-sib families in green forage yield and dry forage yield. Opposite to that, environmental variance estimates from S 1 families were 0.56 and 0.55 of the respective values from half-sib families in green forage yield and dry forage yield respectively.Genotypic variations in term of coefficient relative to the overall mean of green yield and dry yield were less than 20%of the character mean when estimated from half-sib and S 1 families (10.85 vs. 13.96 and 10.21 vs. 14.31% for green and dry forage, respectively).Dry forage yield expressed the highest estimates of heritability in both family types (0.829 and 0.877 for half -sib and S 1 families, respectively). While, the obtained values for green forage yield were of lower magnitude (0.53 and 0.67 for half-sib and S 1 families, respectively). This might indicate additional environmental influences with green forage yield.

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Etude de la valeur agronomique en plante entière au stade de récolte ensilage de différentes variétés de maïs grain sélectionnées entre 1950 et 1980

Abstract: Biomass, corn, silage maize, in vitro digestibility, hybrid, inbred line, genetic improvement. Travail réalisé par le groupe maïs de l'I.N.R.A., avec la collaboration plus particulière de Y. MoNTn!nrvT, A.

Cited by 7 publications

References 1 publication

Forage Yield and Quality of Corn Cultivars Developed in Different Eras

Forage Yield and Quality of Corn Cultivars Developed in Different Eras

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

Variability in Forage yield of a Silage Maize “Zea mays, L.”Base Population via Two Types of Families

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