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Parent-progeny relationships and genotype X environment effects for factors associated with grass tetany and forage quality in Russian Wildrye

Relaciones de la Descendencia de los Padres y el Genotipo X Efectos del Ambiente por Factores Asociados con el Tétano de la Grama y la Calidad del Forraje en Centeno Silvestre Ruso

Asay, Kay H. and Mayland, Henry F. and Jefferson, Paul G. and Berdahl, John D. and Karn, James F. and Waldron, Blair L. (2001) Parent-progeny relationships and genotype X environment effects for factors associated with grass tetany and forage quality in Russian Wildrye. Crop Science. 41:1478-1484.

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Abstract

Grass tetany (hypomagnesemia) has caused severe economic losses in ruminant animals grazing cool-season grasses, including Russian wildrye [Psathyrostachys juncea (Fisch.) Nevski]. The malady has been associated with deficiencies in Mg, Ca, and carbohydrates, and high levels of K. The K/(Ca + Mg) ratio (KRAT), expressed as moles of charge, is often used to express the grass tetany potential of forage. Development and use of new cultivars with an improved balance of the associated minerals would be an economical approach to reduce the incidence of grass tetany. Objectives of this study were to characterize the genetic variability, genotype by environment interactions, and intercharacter relationships for P, K, Ca, Mg, KRAT, crude protein (CP), neutral detergent fiber (NDF), and in vitro dry matter digestibility (IVDMD), among 21 clonal lines of Russian wildrye and their polycross progenies. Evaluations were made for 2 yr at three diverse locations in the USA and Canada. The clonal lines were derived from cultivars and plant introductions. Although the clone x location interaction was usually significant, differences among the clonal lines were significant for K, Ca, Mg, and KRAT, and three forage quality estimates of CP, NDF, and true IVDMD. Although the magnitude of the genetic variability among the progenies was substantially less than that found among the clonal lines, we conclude that the grass tetany potential, CP, NDF, IVDMD, and P concentration of this breeding population can be altered through breeding. Opportunities for genetic improvement in forage quality were particularly favorable for CP. Genetic correlations among the clonal lines suggested that selection for higher levels of CP would be accompanied by increased K, Ca, Mg, and IVDMD and reduced KR AT and NDF.

Item Type: Article
NWISRL Publication Number: 1051
Subjects: Irrigated crops > Grass forage > Chemistry
Irrigated crops > Grass forage > Forage quality
Mass Import - autoclassified (may be erroneous)
Depositing User: Dan Stieneke
Date Deposited: 20 Nov 2010 21:50
Last Modified: 14 Nov 2016 17:19
Item ID: 128
URI: https://eprints.nwisrl.ars.usda.gov/id/eprint/128

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