??:M. D. Casler* and K. P. Vogel ??:Crop Science. (1999) 39:12-20 . ????:???????:???. ???????? ?. ??????.???
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
Accomplishments and Impact
from Breeding for Increased
Forage Nutritional Value
M. D. Casler* and K. P. VogelCrop Science. (1999) 39:12-20
TilleyTerryIVDMD377gkg-1(Boxton and Casler,1993)100gkg-1
(Smooth bromegrass, Bromus inermis Less);(orchardgrass, Doctylis glomerata L.);(perennial ryegrass, Lolium perenne L.); (switchgrass, Panicum virgatum L.);(alfafa, Medicago sativa L. Buxton and Casler,1993);(timothy, Phleum pratense L. Suprenant et al.,1990);(maize, Zea mays Barriere et al.,1995)
(bermudagrass, Cynodon dactylon (L.) Pers. Buxton and Casler, 1993; Vogel and Sleper, 1994)(Digitaria milanjiana Hacker, 1986)
Fig. 1. Genetic differences in average daily gain(ADG), forage ability, and animal production per hectare for 10 cultivars that represent increased in vitro dry matter digestibility (IVDMD) compared with the population from which they were intended to replace. Each variable is plotted against the observed genetic change in IVDMD .
(crested wheatgrass Agropyron spp.)IVDMD(Vogel et al.,1993)
Table1.Mean liveweight gain and production of two perennial ryegrass cultivars with contrasting in vitro organic matter digestibility and intake, evaluated by beef cattle on six farms(data adapted from Walters,1984).
Table 2. Increase in in vitro dry matter digestibility (IVDMD), animal performance, and profit from 1 year of beef production for Trailblazer switchgrass and Manska intermediate wheatgrass compared to control cultivars (data adapted from Vogel and Sleper,1994,and from K.P.Vogel, 1997, unpublished data).
Trailblazerswitchagrass (released in 1984)Manskaintermediate wheatgrass, Thinopyrum intermedium (Host) Barkw.& D. R. Dewey, (released in 1992)IVDMD (Vogel and Sleper,1994)
stylo (Stylosanthes spp.) IVDMD (Ni et al.,1993; Rae et al.,1996)
(Fahey and Hussein,1999)
(Van Soest, 1994)
IVDMDNDF(Buxton and Casler, 1993; Gabrielson et al.,1990)
(DNF)(smooth bromegrass (Casler,1995)),reed camarygrass, Phalares arundinacea L. (Surprenant et al.,1988)(maize)(Wolf et all.,1993)9 to 26 g kg-1cycle-1(1.6 - 4.0 % cycle-1)
(1)smooth bromegrassreed canarygrass(NDF)
(2)smooth bromegrass(NDF)0.41 Mg ha -1(4.7%)reed canarygrass0.060.31 Mg ha-1(2.7-6.1%)
(Inoue et al.,1993, Mackinnon et al.,1998)32%
Inoue et al. (1993)
CP(ADF)CP14g Kg-1(6.9%)(ADF)15g Kg-1(4.4%)(Vanghn et al.,1990)
(McNabb et al.,1993)
(1)reed canarygrasstryptaminecarboline alkaloids13
reed canarygrassgramine tryptamine/ carbokine alkaloids
(1)Italian ryegrass(L. multiflorum Lam.)56%13%12% (Mosely and Baker,1991)120hypomagnesaemia88%10%
(2)Tall fescue(Festuca arnndinacea Schreb.)K/(Ca+Mg)18%(Mayland and sleeper,1993)Mg12%K/(Ca+Mg)8%(Sleper et al.,1997,personal communication)
IVDMD(Buxton and Casler,1993; Casler,1998; Vogel and Sleper,1994)
(Summarized by Buxton and Caster,1993 and Caster,1998)IVDMD
(Casler et al.,1997 unpublished data)
Fig. 2-1 Relationship between neutral detergent fiber(NDF) digestibility (IVNDFD) and lignin concentration or esterified ferulic acid conceration for nine high-IVDMD and nine low-IVDMD smooth bromegrass clones (data adapted from Jung and Casler,1990).
IVDMDIVDMD/1853%1122%(Kephart et al .,1989)
IVDMD(Casler and Carpenter,1989; Ehlke and Casler,1985)
Table 3. Effects of selection (means of selected populations minus standards) measured on three variables( ADF= acid detergent fiber, IVTD= in vitro true digestibility ,and CP= crude protein concentration)of alfalfa at two locations under three management systems(Vaughn et al.,1990).