passages.id: split_1_test_1814_passage
passages.type: progene_text
passages.text: To characterize the change of pH in the abomasal lumen throughout a 24 - hour period , to determine whether pH of the abomasal body differs from pH of the pyloric antrum , and to determine whether oral administration of cimetidine and ranitidine alters pH of the abomasal lumen in milk - fed calves .