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Nitrogen Metabolism of Growing Lambs Fed Coastal Bermudagrass as Influenced by Formaldehyde Treatment and Glucose

Field Crops Utilization and Marketing Research Laboratory³, Richard B. Russell Agricultural Research Center, USDA - SEA — AR, Athens, GA 30604

Abstract

Six abomasally-cannulated wethers (average initial weight 18 kg) were used in a split 3 x 3 Latin square design experiment with a crossover to determine effects of glucose (G) administered orally (O) or infused (I) into the abomasum on nitrogen metabolism and forage fiber digestion. Basal diets were Coastal bermudagrass (CBG) or CBG treated with 1% formaldehyde (F-CBG). Individual treatments were: (1) CBG, (2) CBG + G(O), (3) CBG + G(I), (4) F-CBG, (5) F-CBG + G(0) and (6) F-CBG + G(I). Nitrogen balance was 3.67, 4.86, 4.80, 5.04, 5.73 and 6.04 g/day and urinary N was 6.50, 4.10, 4.42, 5.25, 3.26 and 3.00 g/day for treatments 1,2,3,4,5 and 6, respectively. Nitrogen balance was increased and urinary nitrogen decreased (P<.005) by formaldehyde treatment and addition of G. Crude protein digested was decreased (P<.005) by G but was unaffected by formaldehyde (P>.05). Concentration of essential amino acids in plasma was decreased by addition of G (P<.005). Digestion of cellulose and hemicellulose was decreased by G (P<.005) administered orally but was unaffected by G infusion or formaldehyde treatment. Addition of G thus increased the overall efficiency of nitrogen and energy utilization.

¹ Research animal physiologist and Tesearch chemist, respectively, Field Crops Utilization and Marketing Res. Lab., Athens, GA.

² The authors gratefully acknowledge the assistance of Dr. Ted Emigh, assistant professor of Statistics and Computer Science, Univ. of Georgia, in the statistical analyses of the data in this study.

³ Mention of a trade name, proprietary product or specific equipment does not constitute a guarantee or warranty by the USDA and does not imply its approval to the exclusion of other products that may be suitable.