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Dep. of Agronomy, Univ. of Wisconsin-Madison, Madison, WI 53706-1597
* Corresponding author (mdcasler{at}facstaff.wisc.edu).
Neutral detergent fiber (NDF) concentration, a laboratory predictor of voluntary feed intake by livestock, has become a popular selection criterion in forage breeding programs. The objective of this study was to make empirical comparisons among six phenotypic recurrent selection methods for reducing NDF concentration in smooth bromegrass (Bromus inermis Leyss.). There were three basic selection methods: vNB2 = vegetative harvest, NIRS (near-infrared reflectance spectroscopy) evaluation of NDF, and bi-parental selection; hNU2 = heading growth stage harvest, NIRS, and uni-parental selection; and hWU2 = heading growth stage, wet-laboratory analysis of NDF, and uni-parental selection. Each method was repeated in a replicated polycross nursery of selected individuals (vNP3, hNP3, and hWP3). The vNB2 selection method resulted in the greatest gain for the vegetative growth stage, averaging a 4.0 g kg–1 yr–1 (1.0% yr–1) reduction in NDF concentration. Polycrossing did not improve upon this method, but improved the other two selection methods by an average of 241% because of control of male gametes. The hWP3 selection method resulted in the greatest gain for the heading growth stage, averaging 3.4 g kg–1 yr–1 (0.6% yr–1). Realized gains for the vegetative growth stage selection methods were greater than predicted, likely because of extremely low sampling variation, resulting from uniform selection units. For maximum response, long-term selection for a target growth stage should be conducted at that growth stage. The use of NIRS was highly effective at the vegetative growth stage, but less effective at the heading growth stage.
Received for publication March 6, 1998.
This article has been cited by other articles:
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  M. D. Casler, H. G. Jung, and W. K. Coblentz Clonal Selection for Lignin and Etherified Ferulates in Three Perennial Grasses Crop Sci., March 19, 2008; 48(2): 424 - 433. [Abstract] [Full Text] [PDF]
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M. D. Casler, D. J. Undersander, and W. E. Jokela Divergent Selection for Phosphorus Concentration in Reed Canarygrass Crop Sci., January 16, 2008; 48(1): 119 - 126. [Abstract] [Full Text] [PDF]
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C. Stendal and M. D. Casler Maximizing Efficiency of Recurrent Phenotypic Selection for Neutral Detergent Fiber Concentration in Smooth Bromegrass Crop Sci., January 24, 2006; 46(1): 297 - 302. [Abstract] [Full Text] [PDF]
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C. Stendal, M. D. Casler, and G. Jung Marker-Assisted Selection for Neutral Detergent Fiber in Smooth Bromegrass Crop Sci., January 24, 2006; 46(1): 303 - 311. [Abstract] [Full Text] [PDF]
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M. D. Casler Divergent Selection for Two Measures of Intake Potential in Smooth Bromegrass Crop Sci., September 1, 2002; 42(5): 1427 - 1433. [Abstract] [Full Text] [PDF]
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L.X. Han, M.D. Casler, and C.R. Grau Responses to Divergent Selection for Fiber Concentration at Two Disease Potentials in Smooth Bromegrass Crop Sci., January 1, 2001; 41(1): 30 - 39. [Abstract] [Full Text] [PDF]
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M.D. Casler Structural Responses to Selection for Reduced Fiber Concentration in Smooth Bromegrass Crop Sci., September 1, 1999; 39(5): 1435 - 1438. [Abstract] [Full Text]
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