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Effect of Partial Replacement of Forage Neutral Detergent Fiber with By-Product Neutral Detergent Fiber in Close-Up Diets on Periparturient Performance of Dairy Cows

H. M. Dann^*,1, M. P. Carter^*, K. W. Cotanch^*, C. S. Ballard^*, T. Takano and R. J. Grant^*

^* William H. Miner Agricultural Research Institute, Chazy, NY 12921
Zen-Noh National Federation of Agricultural Co-operative Associations, Tokyo, Japan, 100-0004

Corresponding author: dann{at}whminer.com

The objective of this study was to determine the effect of partial replacement of forage neutral detergent fiber (NDF) with by-product NDF in close-up diets of dairy cattle on periparturient metabolism and performance. Holstein cows (n = 45) and heifers (n = 19) were fed corn silage-based diets containing 1) 30% oat hay, or 2) 15% oat hay and 15% beet pulp from d –21 relative to expected parturition until parturition. After parturition, all animals received the same lactation diet. Animals were group-fed from d –21 to –10 relative to expected parturition and fed individually from d –10 until 14 d in milk. Animals were required to have at least 5 d of prepartum dry matter intake (DMI) data to remain on the study. Data were analyzed as a randomized design and subjected to ANOVA using the MIXED procedure of SAS. Close-up diet did not affect DMI, total tract nutrient digestibility, energy balance, or serum content of nonesterified fatty acids and ß-hydroxybutyrate during the last 5 d prepartum. Prepartum body weight and body condition score were similar between treatments. There was no carryover effect of close-up diet on DMI, energy balance, milk yield, body weight, body condition score, or serum content of nonesterified fatty acids and ß-hydroxybutyrate during the first 14 d in milk. In summary, partial replacement of forage NDF (oat hay) with by-product NDF (beet pulp) did not affect periparturient metabolism or performance.

Key Words: intake • neutral detergent fiber • nonforage fiber source • transition cow