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Dep. of Animal Sci., Univ. of Arkansas, Fayetteville, AR 72701
* Corresponding author (jeturn{at}mail.uark.edu)
Received for publication January 17, 2001.
Relatively little is known about storage of wet (>200 g kg-1 moisture) bermudagrass [Cynodon dactylon (L.) Pers.] hay. Our objective was to assess the changes in nutritive value of bermudagrass hay as a function of hay moisture, storage time, and spontaneous heating. ‘Greenfield’ bermudagrass was grown on a Pickwick silt loam soil (fine-silty, mixed, semiactive, thermic Typic Paleudult) and packaged in conventional rectangular bales at 219, 265, and 302 g kg-1 moisture [low-moisture (LM), medium-moisture (MM), and high-moisture (HM) bales, respectively]. Concentrations of most fiber and fiber-associated N components increased (P < 0.05) during storage, but these changes occurred primarily during the first 12 d. A nonlinear model 
was used to describe the changes in neutral detergent fiber (NDF), acid detergent fiber, lignin, neutral detergent–insoluble N, and acid detergent–insoluble N (ADIN) during storage. The total changes (ß) in NDF were 93.1, 69.5, and 67.8 g kg-1 for HM, MM, and LM bales, respectively. Respective asymptotic maxima for NDF (
) in these treatments were 777, 757, and 739 g kg-1. For ADIN, respective asymptotic maxima () reached 3.17, 1.83, and 1.71 g kg-1 for HM, MM, and LM bales, respectively. On Day 65, ADIN exceeded 10% of the entire N pool in both HM and MM bales. The nutritive value of bermudagrass hay baled and stored at >200 g kg-1 moisture deteriorates during storage, and the greatest deterioration occurs during the first 12 d after baling.
Abbreviations: ADF, acid detergent fiber • ADIN, acid detergent–insoluble nitrogen • DM, dry matter • HDD, heating degree-days > 35°C • HM, high moisture (302 g kg-1) • LM, low moisture (219 g kg-1) • MM, medium moisture (265 g kg-1) • NDF, neutral detergent fiber • NDIN, neutral detergent–insoluble nitrogen • NDSN, neutral detergent–soluble nitrogen • RMSE, root mean square error
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