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Effect of Dietary and Managemental Factors on Reflex Closure of the Esophageal Groove in the Dairy Calf¹

Department of Animal Husbandry, Iowa State College, Ames

ABSTRACT

Effect of dietary and managemental factors on the point of deposition in the stomach of liquids and capsules, fed by the nipple- and bucket-method to four fistulated calves, were studied. Capsules x 1 inches passed readily through the esophageal groove to the omasum when it was closed by concomitant feeding of liquids. Nearly all capsules, regardless of size, were deposited in the reticulum when no liquids were consumed. Consumption of liquids closed the esophageal groove in all calves the first six weeks after birth. Nipple-feeding caused closure of the groove for at least 13 weeks, whereas bucket-feeding was less effective after six weeks. Editor.

The function of the esophageal groove (a muscular structure extending downward from the cardia to the omasum on the median wall in the reticulum) has been studied by many investigators. An extensive review of relevant literature and of studies on deglutition in sheep has been presented by Watson (5).

¹ Journal Paper No. J-3134, Iowa Agricultural Experiment Station, Ames, Iowa. Project No. 814.

² Present address: County Extension Director, Sioux City, Iowa.