[Download] "Development of Gastric and Pancreatic Enzyme Activities and Their Relationship with Some Gut Regulatory Peptides in Grazing Sheep (Report)" by Asian - Australasian Journal of Animal Sciences " eBook PDF Kindle ePub Free
eBook details
- Title: Development of Gastric and Pancreatic Enzyme Activities and Their Relationship with Some Gut Regulatory Peptides in Grazing Sheep (Report)
- Author : Asian - Australasian Journal of Animal Sciences
- Release Date : January 01, 2011
- Genre: Industries & Professions,Books,Business & Personal Finance,
- Pages : * pages
- Size : 342 KB
Description
INTRODUCTION During the first post-natal months, the young ruminant is faced with three types of situations requiring physiological and digestive adaptation: adaptation to the extra uterine environment, maintenance in an extended preruminant stage and weaning (Thivend et al., 1980). The effects of age on pancreatic secretions have been more thoroughly investigated in monogastric animals (Corring et al., 1978; Kretchmer, 1985) than in ruminant species (Huber et al., 1961; Guilloteau et al., 1983, 1984, 1985). However, few studies report effects of age on gastric enzyme secretions in young mammals (Walker, 1959; Hartman et al., 1961; Henschel, 1973; Garnot et al., 1977; Foltmann et al., 1981). There are some reports on digestive physiology for non-grazing lambs; for example, it is generally acknowledged that the pre-ruminant abomasum characteristically secretes large amounts of chymosin, which, with pepsin and hydrochloric acid, coagulates milk casein. At 2 days of age there is a threshold of development of enzyme secretion potentiality in lambs. Quantities of gastric enzymes in relation to empty live weight increase between birth and 2 days, but that of chymosin then decreases, whereas pepsin does not change significantly. The evolution of pancreatic enzyme activity was usually the reverse of that of chymosin; however, trypsin activity was low at birth (Guilloteau et al., 1983). But very few studies report on digestive physiology for grazing lambs, and especially in grazing lambs distributed over a plateau at 2,600 m above sea level.
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