Assessing for genetic and environmental effects on ruminant feed quality in barley (<Emphasis Type="Italic">Hordeum vulgare</Emphasis>) |
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Authors: | Glen P Fox Jan Bowman Alison Kelly Andy Inkerman David Poulsen Robert Henry |
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Institution: | (1) Queensland Grains Research Laboratory, Department of Primary Industries and Fisheries, Toowoomba, QLD, 4350, Australia;(2) Grain Foods CRC, Southern Cross University, Lismore, NSW, 2480, Australia;(3) Department of Animal and Range Sciences, Montana State University, Bozeman, 59717, USA;(4) Department of Primary Industries and Fisheries, Plant Science, Biometry, PO Box 102, Toowoomba, QLD, 4350, Australia;(5) Department of Primary Industries and Fisheries, Plant Science, Warwick, QLD, 4570, Australia |
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Abstract: | Grain samples from a combined intermediate and advanced stage barley breeding trial series, grown at two sites in two consecutive
years were assessed for detailed grain quality and ruminant feed quality. The results indicated that there were significant
genetic and environmental effects for “feed” traits as measured using grain hardness, acid detergent fibre (ADF), starch and
in-sacco dry matter digestibility (ISDMD) assays. In addition, there was strong genotypic discrimination for the regressed feed performance
traits, namely Net Energy (NE) and Average Daily Gain (ADG). There was considerable variation in genetic correlations for
all traits based on variance from the cultivars used, sites or laboratory processing effects. There was a high level of heritability
ranging from 89% to 88% for retention, 60% to 80% for protein and 56% to 68% for ADF. However, there were only low to moderate
levels of heritability for the feed traits, with starch 30–39%, ISDMD 55–63%, ADF 56–68%, particle size 47–73%, 31–48% NE
and ADG 44–51%. These results suggest that there were real differences in the feed performance of barleys and that selection
for cattle feed quality is potentially a viable option for breeding programs. |
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Keywords: | Barley Cultivar Digestibility Energy Feed Heritability |
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