Abomasal vs. Oral Administration of Proteins to Wethers2

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Abstract
Diet digestibility and nitrogen retention with abomasal and oral administration of four different proteins to wethers were determined. Following oral administration of soybean protein or zein, no differences were noted in digestion of protein, dry matter and cellulose or in nitrogen retained. Abomasal administration of soybean protein did not significantly affect diet digestibility; however, retention of nitrogen was increased. Protein digestion was reduced and retention of nitrogen decreased when zein was administered into the abomasum. Apparent digestibilities of protein, dry matter and cellulose were not significantly affected by methods of administration of casein or gelatin. Retention of nitrogen increased with abomasal administration of either casein or gelatin; however, nitrogen retained with casein exceeded that with gelatin.