Circadian changes in the abomasal secretions of the preruminant calf

Abstract

Summary. The purpose of this study was to investigate the circadian changes in the abomasal secretions (quantities of juice, enzymes and electrolytes) of the preruminant calf. The gastric juice was collected every hour from five calves fitted with an innervated abomasal pouch and given milk twice daily, with a 7-h interval between the morning and the evening meals.The amounts of gastric secretions produced were steady during 24 h, except for changes after the meals. The morning meal caused a considerable increase in secretions of electrolytes and enzymes. The values of CI-, H + , Na+ + and K + ions, chymosin and pepsin in the first postprandial hour were 3.8, 4.1, 3.5, 2.6, 2.4 and 2.1 times higher, respectively, than those of the 24th hour used as prefeeding levels. The influence of the evening meal on secretions of CI-and Na + ions and enzymes was less marked and also more delayed for all electrolytes. Variations in the amounts secreted per hour appeared to be greater for H + + ions than for enzymes, thus the ratios between maximal and minimal quantities observed during the 24-h cycle were 4.6 for H + ions and 2.8 for chymosin.Introduction.

Abomasal secretion and gastrin blood level in sheep fed diets with different fibre content

“…However, acetic and butyric acid concentration in the rumen 2 h after feeding was not different between the LFD and HFD diet (Korczyński, 2000). In this study Clion output was higher than measured in preruminat calves (Guilloteau and Toullec, 1983). Moreover, we cannot confi rm the fi ndings of mentioned authors who postulated the cyclic variations of the Cllevel in abomasal juice (data not shown).…”

Effect of Age on the Exocrine Pancreatic Secretion of the Preruminant Milk-fed Goat

“…Studies performed by Thivend et al (1980) in several preruminant species have also shown that the digestive enzyme system is not yet completely developed in the newborn animal. Thus, the activity of these enzymes is low at birth, although the concentration of both total protein and individual pancreatic enzymes increase thereafter, with advancing age (Guilloteau & Toullec, 1983;Gusakov & Kurishka, 1985).…”

Les sécrétions digestives et leur régulation chez le jeune veau préruminant

“…3.i / Sécrétions digestives et repas L'augmentation du volume du suc gastrique sécrété et de son contenu (électrolytes dont HCI, chymosine et pepsine) au cours des 2 à 3 h qui suivent le repas (Guilloteau et Toullec 1983) est à relier avec l'accroissement postprandial du taux de gastrine (Bloom et al 1978, Toullec et al 1992) (figure 2).…”