The Chemical Composition of Russian and Altai Wild Ryegrass and Crested Wheatgrass as Influenced by N Fertilization and Date of Harvest

Lawrence, T.; Winkleman, G. E.; Warder, F. G.

doi:10.4141/cjps82-056

Cited by 17 publications

(17 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Phosphorus concentrations of all grasses decreased with maturity (Table 3) and were within the range of other reports (Lawrence et al 1982;Currie et al 1986). Few significant differences in phosphorus content existed between species at each growth stage, but these differences became greater as the grasses matured.…”

Section: Phosphorussupporting

confidence: 70%

Agronomic characteristics and nutritive value of 11 grasses grown with irrigation on a saline soil in southwestern Saskatchewan

Glover¹,

Kielly²,

Jefferson³

et al. 2004

Can. J. Plant Sci.

View full text Add to dashboard Cite

Grasses were clipped at threeleaf, heading and seed set. Yield, leaf-to-stem ratio (LSR), botanical composition (BC), crude protein (CP), phosphorus, fibre and in vitro dry matter digestibility (IVDMD) were determined. There were differences (P < 0.05) between the grasses in yield at each growth stage with smooth bromegrass and creeping foxtail having high yields and meadow bromegrass low yields at all growth stages. The BC of most target grasses was greater than 60%. Exceptions were Dahurian wild ryegrass, crested wheatgrass, tall wheatgrass and meadow bromegrass. There were few significant differences between the grasses for LSR, except that Russian and Altai wild ryegrasses and meadow bromegrass had higher LSR (P < 0.05) than the other grasses. Differences in CP, P, neutral (NDF) and acid (ADF) detergent fibres were inconsistent and small at each growth stage but CP and P declined (P < 0.05) while NDF and ADF increased (P < 0.05) with plant maturation. There were differences (P < 0.05) between years and cuts for all traits except between years for yield, BC and LSR at seed set (P > 0.05). Dry matter intake (DMI) NDF and in vivo dry matter digestibility (DMD) were determined for hay cut from each plot using sheep. The relationship between forage NDF and DMI: was used to calculate predicted DMI (PDMI) for all clipped samples. Hay IVDMD differed from DMD (P < 0.05) and the regression DMD = 1.27 IVDMD -5.75 (r 2 = 0.89; RSD = 3.21; P < 0.001) was used to adjust IVDMD to predicted in vivo digestibility estimates (PDMD). PDMD differed (P < 0.05) between the grasses only at heading and seed set. Yield of PDDM (YPDDM), yield of CP (YCP) and the sum of these and PDMI were used to rank the grasses for usefulness as hay or pasture for early or late grazing.

show abstract

Section: Phosphorussupporting

confidence: 70%

Agronomic characteristics and nutritive value of 11 grasses grown with irrigation on a saline soil in southwestern Saskatchewan

Glover¹,

Kielly²,

Jefferson³

et al. 2004

Can. J. Plant Sci.

View full text Add to dashboard Cite

show abstract

“…Nutritionally relevant variation in mineral concentrations and KRAT have been also documented in crested wheatgrass (Agropyron cristatum and A. desertorum) (Asay et al 1996; and Russian wildrye (Psathyrostachys juncea) Asay and Mayland 1990;Jefferson et al 2001;Karn et al 2005). In comparisons with crested wheatgrass and Russian wildrye, Altai wildrye (Leymus angustus) had especially high KRAT values (Lawrence et al 1982). Despite the large number of studies of KRAT variation there has not been any effort to dissect the genetic control of various forage mineral concentrations at the genome level of grasses.…”

Section: Introductionmentioning

confidence: 99%

Comparative mapping of fiber, protein, and mineral content QTLs in two interspecific Leymus wildrye full-sib families

Larson

Mayland²

2007

Mol Breeding

View full text Add to dashboard Cite

Crude protein (CP), neutral detergent fiber (NDF), acid detergent fiber (ADF), and mineral content are important components of forage quality in grasses.substantially increase the risk of grass tetany (hypomagnesemia) in grazing animals, which is a serious problem associated with some cool-season grasses. The objectives of this study were to map and compare QTLs controlling concentrations of CP, NDF, ADF, Al, B, Ca, Cl, Cu, Fe, K, Mg, Mn, Na, P, S, Si, Zn, and KRAT in two full-sib Leymus triticoides · (L. triticoides · L. cinereus) TTC1 and TTC2 families. Significant genetic variation and QTLs were detected for all traits, with evidence of conserved QTLs for ADF (LG1a, LG5Xm, LG7a), NDF (LG7a), Ca (LG1b), CP, (LG5Xm), KRAT (LG3b, LG6b, LG7a, LG7b), Mn (LG2b, LG3b, LG4Xm), and S (LG3a) content in both TTC1 and TTC2 families. Moreover, the direction of QTL effects was the same for 13 of the 14 homologous QTLs in both families. The TTC1 and TTC2 KRAT QTLs on LG7a and LG7b were located near markers defining homoeologous relationships between the sub-genomes of allotetraploid Leymus, suggesting possible QTL homoeology. Another 88 QTLs were unique to one family or the other, but many of these clustered in genome regions common between the two families. These results will support development of new Leymus wildrye forages and help characterize genes controlling mineral uptake and fiber synthesis.

show abstract

“…High levels of K have been measured in Russian wildrye in Mayland (unpublished). Lawrence et al (1982) reported Russian wildrye had higher K/ (Mg+Ca) values than crested wheatgrass. They concluded that, particularly under heavy fertilization, supplementation of diets with Mg and/ or Ca might be required to prevent grass tetany and assure good performance.…”

mentioning

confidence: 99%

Genetic Variability for Elements Associated with Grass Tetany in Russian Wildrye

Asay¹,

Mayland²

1990

Journal of Range Management

View full text Add to dashboard Cite

Grass tetany (hypomagnesemia) may be an important factor limiting productivity of animals grazing Russian wildrye [Psathyrostachys juncea (Fisch.) Nevski]. This malady is associated with relatively low concentrations in the forage of Mg and Ca, and high values for K and K/(Ca+Mg). We studied the genetic variablity in a Russian wildrye breeding population for mineral elements that relate to grass tetany in ruminants. Forty-five progeny lines, established as spaced plants in a randomized complete block, were sampled at the pre-boot and boot stages in each of 2 years and analyzed for Mg, Ca, K, and P. Although seasonal variation was evident, K/(Ca+Mg) of the progeny lines ranged from 3.2 to 4.6, well above the 2.2 level at which a 5% incidence of grass tetany has been found in dairy cattle. With few exceptions, progenies differed for all traits evaluated. Differences among progenies were relatively consistent over harvests for all traits. A reduced tetany potential (RTP) was computed as the sum of normalized Mg and reciprocal of K/(Ca+Mg) values, providing an estimate of the grass tetany risk for individual progeny lines. The variation among progenies, and the magnitude of broad-sense heritability estimates for RTP (0.48) and K/(Ca+Mg) values (0.31), indicate that mineral ion composition of this breeding population can be altered through breeding. The high K/(Ca+Mg) values in the population suggest that it may be helpful to introduce genetic factors conditioning lower grass tetany potential from other sources. Intercharacter correlations suggest that breeding for higher levels of Mg will be accompanied by increased Ca and, to a lesser extent, increased K.

show abstract

The Chemical Composition of Russian and Altai Wild Ryegrass and Crested Wheatgrass as Influenced by N Fertilization and Date of Harvest

Cited by 17 publications

References 9 publications

Agronomic characteristics and nutritive value of 11 grasses grown with irrigation on a saline soil in southwestern Saskatchewan

Agronomic characteristics and nutritive value of 11 grasses grown with irrigation on a saline soil in southwestern Saskatchewan

Comparative mapping of fiber, protein, and mineral content QTLs in two interspecific Leymus wildrye full-sib families

Genetic Variability for Elements Associated with Grass Tetany in Russian Wildrye

Contact Info

Product

Resources

About