Variation of Chemical Constituents and Morphological Characters Within and Between Alfalfa Populations

Heinrichs, Dirk; Troelsen, J. E.; Warder, F. G.

doi:10.4141/cjps69-051

Cited by 34 publications

(24 citation statements)

References 1 publication

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“…For instance, with the four-harvest data WL 322 had high DMY and IVDMD whereas Excalibur had low DMY and IVDMD (Table 3). Several studies also reported no correlation or weak correlations between digestibility and DMY when cultivars or lines were compared on a single sampling date corresponding to a normal harvesting date (Heinrichs et al 1969;Hill and Barnes 1977;Sunberg et al 1983;Coors et al 1986;Julier and Huyghe 1997). Other studies, however, reported a reduced forage DMY as a result of selection for improved nutritive quality (Kephart et al 1989).…”

Section: Relationship Among Variatesmentioning

confidence: 99%

In vitro ruminal undegradable proteins of alfalfa cultivars

Tremblay¹,

Michaud²,

Bélanger³

et al. 2000

Can. J. Plant Sci.

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. 2000. In vitro ruminal undegradable proteins of alfalfa cultivars. Can. J. Plant Sci. 80: 315-325. The quality of alfalfa would be greatly improved by an increase in its ruminal undegradable protein (RUP) concentration. Protein degradation rate (PDR), in vitro dry matter digestibility (IVDMD), leaf weight ratio (LWR), dry matter yield (DMY), total nitrogen (TN), in vitro RUP (expressed on both TN, RUP-TN, and dry matter basis, RUP-DM), acid detergent fiber (ADF), and neutral detergent fiber (NDF) concentrations were determined in 27 alfalfa cultivars. Cultivars were seeded in triplicate on 2 consecutive years and evaluated during the 2 subsequent production years with two harvests per year. Protein degradation rate and RUP-TN were determined using a ruminal inhibitor in vitro system. Data were averaged for spring growth, summer regrowth, and both harvests across 2 production years. Each of the three data sets was analyzed by ANOVA followed by a principal component analysis (PCA) on the ANOVA means. For the four-harvest data, cultivar differences were highly significant (P < 0.001) for all variates except for PDR (P = 0.07) and RUP-TN concentration (P = 0.10). The first PCA axis was largely defined positively by RUP-DM, IVDMD, TN, LWR, and RUP-TN, but negatively with ADF, NDF, PDR, and DMY. The second PCA axis defined a contrast between PDR versus RUP-TN, DMY, ADF, and NDF. Five cultivars were distinctive with high or low PCA scores in all three PCA. Rangelander and Heinrichs, along with Ultra, had low PDR; the first two cultivars had low DMY whereas Ultra was a medium-yielding cultivar. In contrast, Algonquin and Oneida VR had high PDR and medium DMY. While the first principal component (PC) indicated a general trend that low PDR and high RUP were associated with low-yielding cultivars, the second PC identified specific cultivars with both low PDR and high DMY. Therefore, selection for low PDR and high DMY is feasible.Key words: ruminal protein escape, dry matter digestibility, alfalfa Tremblay, G. F., Michaud, R., Bélanger, G., McRae, K. B. et Petit, H. V. 2000. Teneur en protéine non dégradable au niveau du rumen de différents cultivars de luzerne. Can. J. Plant Sci. 80: 315-325. La valeur nutritive de la luzerne serait grandement améliorée si son contenu en protéine non dégradable au niveau du rumen (RUP) était augmenté. Le taux de dégradation ruminale de la protéine (PDR), la digestibilité in vitro de la matière sèche (IVDMD), le rapport feuilles:plante entière (LWR), le rendement en matière sèche et les concentrations en azote total (TN), en RUP (exprimées sur une base de TN, RUP-TN, ou de matière sèche, RUP-DM), en fibre par détergent acide (ADF) et en fibre par détergent neutre (NDF) ont été mesurés chez 27 cultivars de luzerne. Les cultivars ont été semés en trois répétitions pendant deux années consécutives et évalués au cours des deux années de croissance suivantes au rythme de deux coupes par an. Le PDR et la RUP-TN ont été mesurés à l'aide d'une méthode in vitro utilisant du liquide ruminal et des ...

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Section: Relationship Among Variatesmentioning

confidence: 99%

In vitro ruminal undegradable proteins of alfalfa cultivars

Tremblay¹,

Michaud²,

Bélanger³

et al. 2000

Can. J. Plant Sci.

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“…However, two alfalfa cultivars, differing for digestibility, induced differences in milk production of dairy cows (Emile et al, 1996(Emile et al, , 1997. Genetic variation for digestibility in alfalfa has been shown (Heinrichs et al, 1969;Buxton et al, 1987;Lenssen et al, 1991;Julier et al, 1996), and possibilities for improving populations have been demonstrated (Demment et al, 1986). Some data are available on changes in digestibility during plant growth.…”

Section: Introductionmentioning

confidence: 99%

Effect of growth and cultivar on alfalfa digestibility in a multi-site trial

Julier

Huyghe

1997

Agronomie

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Summary -It is well known that digestibility decreases during growth in alfalfa (Medicago sativa L), but the effects of genetic variation and the environment on digestibility are less documented. Seven cultivars were studied in five locations in France, and four samplings were taken over two regrowth cycles. Forage yield, stem height, number of stems, plant digestibility, stem digestibility and leaf/stem ratio were recorded. All traits were influenced by location, cycle, cultivar and sampling date effects. Digestibility decreased with yield, as plants grew, and leaf/stem ratio also decreased. The regression between plant digestibility and yield was the same for all the cultivars. However, this regression was quite different depending on the location. Digestibility decreased faster in some locations than in others. Location effects were not related to average temperatures. The seven cultivars showed differences in digestibility, as a result of various combinations of leaf/stem ratio and stem digestibility. At

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“…At Harvest 4 the contribution of stubble shoots was 21% and 33% for Moapa and Glutinosa respectively, the comparable figures for Harvest 7 being 15% and 26%. Glutinosa was thus similar to other falcata lucernes (Heinrichs et al 1969) in that internode lengths were appreciably shorter than those of the sativa type Moapa; thus Glutinosa had more stubble shoots below cutting height. The persistence of Glutinosa under grazing (Iversen 1967;White et al 1975) is probably due in part to these shorter internodes, which give more sites for shoot regeneration close to ground level.…”

Section: Differences Hetween Cultivarsmentioning

confidence: 60%

“…Much of the recent interest in lucerne as a pasture plant for grazing has been centred on the effects of higher proportions of Medicago falcata L. genes which confer wide crowns, increased rhizomatous development (Smith 1955), and shorter internodes (Heinrichs et al 1969). Leach (1969), working with spaced plants, showed that 'Totana', a sativa type (Iversen & Meijer 1967), had few large shoots which grew rapidly after lenient cutting.…”

Section: Introductionmentioning

confidence: 99%

Crown development of two diverse genotypes of lucerne

Musgrave

Länger

1977

New Zealand Journal of Agricultural Research

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Crown development of 'Moapa' (Medicago sativa L.) and 'College Glutinosa' (M. media Per.) lucernes was examined under simulated sward conditions. The crown included all shoots originating from nodes less than 6 mm apart at the base of other stems; stubble shoots were those from nodes more than 6 mm apart. The pattern of shoot numbers and weights during crown development is described in relation to two defoliations in the establishment year and a final cut in the following spring. The crown of Moapa plants initially developed more rapidly than that of College Glutinosa, but this effect had largely disappeared by the end of the second growth cycle. After the initial growth cycle College Glutinosa had more stubble shoots than Moapa and it had developed more crown shoots than Moapa by the third growth cycle. Moapa had heavier shoots in the third growth cycle, but this did not compensate for it having fewer shoots. Because of its short stem internodes, College Glutinosa had more sites for shoot regeneration close to ground level. 453

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Variation of Chemical Constituents and Morphological Characters Within and Between Alfalfa Populations

Abstract: A total af t26 atf^lf^otr".r, .trtfoT1l$o"" populations, were grown in three replicates-

Cited by 34 publications

References 1 publication

In vitro ruminal undegradable proteins of alfalfa cultivars

In vitro ruminal undegradable proteins of alfalfa cultivars

Effect of growth and cultivar on alfalfa digestibility in a multi-site trial

Crown development of two diverse genotypes of lucerne

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