HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Yu, Y. Articles by Thomas, J. W. Search for Related Content PubMed Articles by Yu, Y. Articles by Thomas, J. W.

Estimation of the Extent of Heat Damage in Alfalfa Haylage by Laboratory Measurement^{1, 2,}

Michigan State University, East Lansing 48824

Abstract

The potential of 30 laboratory procedures to predict forage quality was tested with 21 hay or haylage samples of known in vivo nitrogen and dry matter digestibilities. Simple regression analyses suggested that the acid-detergent insoluble nitrogen calculated as a percent of total nitrogen was the most reliable predictor for nitrogen digestibility (r² = .86). The equation using acid-detergent fiber as a percent of dry matter (X₁) and acid-detergent insoluble nitrogen as a percent of dry matter (X₂) as predictors for nitrogen digestibility (Y) was found of value for practical use (R² = .91). This equation was Y = 113.88 –.76(X₁) –47.27(X₂). Acid-detergent insoluble nitrogen as a percent of total nitrogen was negatively related to nitrogen digestibility to a greater extent for forages with little or no heat damage than for forages more severely damaged by heat. The relationship between acid-detergent insoluble nitrogen as a percent of total nitrogen and nitrogen digestibility was not strictly linear but logarithmic transformation of the former, however, did not result in an increased r² value. A polynomial multiple regression improved the R² value (.88). Among the 30 laboratory measurements, acid-detergent fiber was the most reliable predictor for dry matter digestibility (Y) (r² = .88). The prediction equation was Y = 93.79 – .9 (acid-detergent fiber as a percent of dry matter). Using only two analytical techniques an R² of. 96 was obtained with pepsin and hot water solubility test values and higher R² (.98) with four test values.

¹ Publication with the approval of the Director of the Agricultural Experiment Station as Journal Article No. 7375.

² Appreciation is expressed to H. K. Goering, N. A. Jorgensen and D. C. Pierson for providing forage data, and R. Neitzel for assistance in statistical analyses.

³ Present address: Department of Animal and Poultry Science, University of Guelph, Guelph, Ontario, Canada.

⁴ Department of Dairy Science.

This article has been cited by other articles:

				D. H. Kleinschmit, J. L. Anderson, D. J. Schingoethe, K. F. Kalscheur, and A. R. Hippen Ruminal and Intestinal Degradability of Distillers Grains plus Solubles Varies by Source J Dairy Sci, June 1, 2007; 90(6): 2909 - 2918. [Abstract] [Full Text] [PDF]

				G. A. Broderick, A. F. Brito, and J. J. O. Colmenero Effects of Feeding Formate-Treated Alfalfa Silage or Red Clover Silage on the Production of Lactating Dairy Cows J Dairy Sci, March 1, 2007; 90(3): 1378 - 1391. [Abstract] [Full Text] [PDF]

				D. H. Kleinschmit, D. J. Schingoethe, K. F. Kalscheur, and A. R. Hippen Evaluation of Various Sources of Corn Dried Distillers Grains Plus Solubles for Lactating Dairy Cattle J Dairy Sci, December 1, 2006; 89(12): 4784 - 4794. [Abstract] [Full Text] [PDF]

				W.K. Coblentz, J.E. Turner, D.A. Scarbrough, K.E. Lesmeister, Z.B. Johnson, D.W. Kellogg, K.P. Coffey, L.J. McBeth, and J.S. Weyers Storage Characteristics and Nutritive Value Changes in Bermudagrass Hay as Affected by Moisture Content and Density of Rectangular Bales Crop Sci., September 1, 2000; 40(5): 1375 - 1383. [Abstract] [Full Text]