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Feed Utilization and Anatomical Adaptation of Kids after Removal of Compartments of Forestomach or Omasal Laminae

Department of Nutrition, National Institute of Animal Industry, Chiba-shi, Japan

ABSTRACT

Three modifications of the digestive system of kids were made by removing rumen, reticulum, and omasal laminae. Operated animals with a control were subjected to long feeding trials. After weaning, several highly digestible feeds were prepared and fed. One of five animals having all forestomach compartments removed survived more than a year during which the animal encountered pyloric obstruction twice. Two of three animals having the ruminoreticulum removed survived more than 9 mo. These long survivors finally were slaughtered. Though appetite of these animals became a problem, digestive abilities for highly digestible solid feeds were almost the same as those of animals with the intact rumen. No regeneration of the stomach compartment was observed, but cecum became significantly larger. In the reticulum of the animal with omasal laminae removed, dietary bone particles accumulated, suggesting an omasal function of passing heavier particles. Chemical components of blood, saliva, and body fat were measured.