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Effect of Water Addition on Selective Consumption (Sorting) of Dry Diets by Dairy Cattle

¹ Department of Dairy Science, University of Wisconsin-Madison, Madison 53706
² Dipartimento di Produzione Animale, Università degli Studi di Bari, Bari 70126, Italy

Corresponding author: L. E. Armentano, e-mail: learment{at}facstaff.wisc.edu.

The objective of this study was to determine whether adding water to a dry diet would reduce sorting and improve cow performance. Eighteen multiparous lactating Holstein cows were used in a cross-over design with 21-d periods. Treatments had the same dietary composition and differed only by adding water (WET) or not (DRY). Diets consisted of 10% alfalfa silage, 30% hay (approximately 80% grass and 20% alfalfa), and 60% concentrate [dry matter (DM) basis]. Dietary DM was 80.8% for DRY and 64.4% for WET. Both diets contained 16.9% crude protein and 24.3% neutral detergent fiber. Particle size was determined using the Wisconsin Particle Size Separator on the as-fed diets. The separator has five square-hole screens (Y₁ to Y₅) with diagonal openings of 26.9 mm for Y₁, 18 mm for Y₂, 8.98 mm for Y₃, 5.61 mm for Y₄, and 1.65 mm for Y₅, and one pan. Sorting was calculated on a 60°C DM basis (60DM). Predicted intake of Y_i was calculated as the product of 60DM intake (60DMI) and the 60DM fraction of Y_i in the total mixed ration for that screen. For DRY and WET, actual 60DMI by screen expressed as a percentage of predicted intake was 61.4% vs. 75.2% for Y₁, 83.8% vs. 98.6% for Y₂, 85.6% vs. 90.8% for Y₃, 95.2% vs. 96.0% for Y₄, 100.1% vs. 101.9% for Y₅, and 105.9% vs. 102.9% for pan, respectively. Adding water did not affect total DM intake (28.3 kg/d) or milk production (41.3 kg/d). Neutral detergent fiber intake was 6.42 kg/d for WET and 6.15 kg/d for DRY. Milk fat percentage tended to be higher (3.41% vs. 3.31%) when cows consumed WET vs. DRY. No differences in ruminal pH, NH₃, and volatile fatty acids were observed. Cows sorted against long particles in favor of shorter particles on both diets. Adding water to dry diets reduced sorting and tended to increase neutral detergent fiber intake and milk fat percentage.

Key Words: sorting • water • long particle

Abbreviation key: cNDF = NDF concentration in the diet consumed, DRY = basal dry diet without water addition, NDFI = NDF intake, WET = basal dry diet plus 25% water added (DM basis), 60DM = 60°C DM, 60DMI = 60°C DMI.

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