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Journal of Dairy Science Vol. 51 No. 5 710-714
© 1968 by American Dairy Science Association ®
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Evaluation of the Esophageal-Fistula Cannula and Hand-Clip Methods for Sampling Coastal Bermudagrass Pastures1

L. D. Guthrie2, G. H. Rollins and G. E. Hawkins

Department of Dairy Science, Auburn University Agricultural Experiment Station, Auburn, Alabama

ABSTRACT

Two management treatments of Coastal Bermudagrass were used to compare esophageal-fistula cannula and hand-clip (5 cm height) methods of sampling pasture forage and to determine relationships between chemical components and animal responses. Forage samples were collected on the first, fourth, and seventh days of each week for ten consecutive weeks and crude protein, acid-detergent-fiber (ADF), lignin, and ash contents determined.

Milk production, milk composition, forage digestibility, forage dry matter intakes, and weight changes were determined for six cows per treatment.

Forage from Treatment 1 (mowed at 10.2 cm) was higher (P < 0.01) in protein and slightly lower (P < 0.05) in acid-detergent-fiber and lignin than Treatment 2 (mowed at 20.3 cm) forage. Esophageal-fistula-collected forage was higher (P < 0.01) in protein and ash, but lower (P < 0.01) in acid-detergent-fiber and lignin than hand-clip samples. Forage collected the first day of the week was higher (P < 0.01) in protein and lower (P < 0.05) in lignin than that collected the fourth and seventh days. There were no differences (i.e., P > 0.05) in acid-detergent-fiber values between days or in the milk production, digestibility of dry matter, or intake of Coastal forage by cows grazing the two management treatments.

FOOTNOTES

1 Taken from data, presented by the senior author to the Graduate School of Auburn University in partial fulfillment of the requirements for the M.S. degree.

2 Present address: Department of Dairy Science, Louisiana State University, Baton Rouge.






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