The Effect of Corn Silage Particle Size on Eating Behavior, Chewing Activities, and Rumen Fermentation in Lactating Dairy Cows
- 1 October 2003
- journal article
- Published by American Dairy Science Association in Journal of Dairy Science
- Vol. 86 (10), 3343-3353
- https://doi.org/10.3168/jds.s0022-0302(03)73937-x
Abstract
The objective of this experiment was to evaluate effects of reducing corn silage particle size on eating behavior, chewing activity, and rumen fermentation in lactating dairy cows. Four cannulated, multiparous cows averaging 110 ± 4 d in milk and weighing 675 ± 70 kg were randomly assigned to a 4 × 4 Latin square. During each of four 14-d periods, animals were offered one of four diets that were chemically similar but var- ied in corn silage particle size: short (SH), mostly short (MSH), mostly long (MLG), and long (LG), with a geo- metric mean particle length of 7.4, 7.8, 8.3, and 8.8 mm, respectively. Reducing particle size increased dry matterintake(DMI)linearly(28.0,26.8,26.8,and25.7 kg/d for SH, MSH, MLG, and LG respectively). At 8, 16, and 24 h postfeeding, the neutral detergent fiber (NDF) concentration of feed remaining in the bunk decreased linearly with reduced particle size. Time spent eating or ruminating was not different across treatments; however, total chewing activity (TC; sum of time spent eating and ruminating) exhibited a qua- dratic response with highest chewing activities ob- served for diets with shortest and longest particle size. Eating or ruminating time per kilogram of DMI was not affected by corn silage particle size, but TC per kilogram of DMI decreased linearly with decreasing particle size. In comparison, when expressed as min- utes per unit of NDF intake (NDFI), ruminating, and TC were linearly reduced as particle size decreased. Rumen pH was not affected by corn silage particle size even though total concentration of volatile fatty acids increased linearly from 89.1 mM/L to 93.6 mM/L as diet particle size decreased. A quadratic effect was observedinmolarproportionofacetateandpropionate with the highest concentration observed in animals consuming diets of intermediate particle size. Results of this experiment suggest that reducing corn silageKeywords
Funding Information
- USDA (2001-34281-11219)
This publication has 25 references indexed in Scilit:
- Modification of the Penn State Forage and Total Mixed Ration Particle Separator and the Effects of Moisture Content on its MeasurementsJournal of Dairy Science, 2003
- The Effect of Reducing Alfalfa Haylage Particle Size on Cows in Early LactationJournal of Dairy Science, 2003
- Corn Silage Management: Effects of Hybrid, Chop Length, and Mechanical Processing on Digestion and Energy ContentJournal of Dairy Science, 2003
- Technical Note—A Comparison of Methods Used to Measure Eating and Ruminating Activity in Confined Dairy CattleJournal of Dairy Science, 2002
- Corn Silage Management I: Effects of Hybrid, Maturity, and Mechanical Processing on Chemical and Physical CharacteristicsJournal of Dairy Science, 2002
- Crop Processing and Chop Length of Corn Silage: Effects on Intake, Digestion, and Milk Production by Dairy CowsJournal of Dairy Science, 2000
- Processing, mixing, and particle size reduction of forages for dairy cattle.Journal of Animal Science, 1999
- Effect of Dietary Forage Concentration and Buffer Addition on Duodenal Flow of Trans-C18:1 Fatty Acids and Milk Fat Production in Dairy CowsJournal of Dairy Science, 1997
- Milk Fat Depression in Dairy Cows: Role of Silage Particle SizeJournal of Dairy Science, 1990
- AUTOMATED SIMULTANEOUS DETERMINATION OF AMMONIA AND TOTAL AMINO-ACIDS IN RUMINAL FLUID AND INVITRO MEDIAJournal of Dairy Science, 1979