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Effects of grass hay proportion in a corn silage-based diet on rumen digesta kinetics and digestibility in dairy cows

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Title: Effects of grass hay proportion in a corn silage-based diet on rumen digesta kinetics and digestibility in dairy cows
Authors: Win, Kyaw San Browse this author
Ueda, Koichiro Browse this author →KAKEN DB
Kondo, Seiji Browse this author →KAKEN DB
Keywords: corn silage
dairy cow
grass hay
passage rate
Issue Date: Sep-2015
Publisher: Wiley-Blackwell
Journal Title: Animal science journal
Volume: 86
Issue: 9
Start Page: 833
End Page: 841
Publisher DOI: 10.1111/asj.12365
PMID: 25599766
Abstract: In this study, we aimed to evaluate the effects of six levels of orchardgrass hay (GH) proportion (0%, 10%, 20%, 30%, 40% or 50% of dry matter) in finely chopped corn silage (CS)-based diets on digesta kinetics of CS and GH in the rumen. Six non-lactating, rumen-cannulated Holstein cows were used in a 6x6 Latin square design. Ruminal digesta kinetics was measured by ruminal dosing of feed particle markers (dysprosium for CS, erbium for GH) followed by fecal sampling. The increase of GH proportion had a quadratic effect (P<0.01) on total tract digestibility of neutral detergent fiber (NDF) and acid detergent fiber. The proportion of GH did not affect the particle size distribution of rumen digesta, total weight of dry matter or NDF in the rumen. The rates of large particle size reduction in the rumen for CS tended to increase linearly with increasing GH proportion (P=0.077). A quadratic effect (P<0.05) was found with increasing the GH proportion for the ruminal passage rate of small GH particles, but not for CS particles. The results suggested that associative effects between CS and GH could be generated on rumen digesta kinetics when cows were fed a CS-based diet with an increased proportion of GH.
Type: article (author version)
Appears in Collections:農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 上田 宏一郎

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