Biomaterial Database

Fluid balance during food deprivation and after intraruminal loads of water or isotonic saline in lactating and anoestral goats. 1986

K Dahlborn, and B E Karlberg

A study was made of water and salt balance during a 28 h period of starvation in lactating and anoestral goats. Food deprivation caused diminished water intake in all but one animal, and the secretion of urine and milk gradually decreased. The plasma volume and the glomerular filtration rate were reduced, the plasma Na concentration lowered, and the plasma renin activity and plasma aldosterone concentration raised during starvation. After 28 h without food the goats were given a load of water or saline into the rumen. The fall in the plasma protein concentration that occurred indicates that the plasma volume increased in all animals within 4 h of receiving saline, but was unchanged after the water load. The plasma Na concentration decreased further after the water load, but increased in all animals after the saline load. The plasma renin activity and plasma aldosterone concentration remained elevated after the intraruminal water load, but fell towards basic values after the saline load. The renal Na excretion decreased during food deprivation, and showed no increase within 4 h of saline loading. It appears that only the load of saline restored the salt and water homoeostasis of the animal. Lactating and anoestral goats do not apparently differ in their response to starvation. The effects of starvation on fluid balance seem to become as severe in goats as in monogastric species despite food reservoirs in the reticulo-rumen and omasum at the onset of food deprivation.

UI	MeSH Term	Description	Entries
D007267	Injections	Introduction of substances into the body using a needle and syringe.	Injectables,Injectable,Injection
D007552	Isotonic Solutions	Solutions having the same osmotic pressure as blood serum, or another solution with which they are compared. (From Grant & Hackh's Chemical Dictionary, 5th ed & Dorland, 28th ed)	Solutions, Isotonic
D007774	Lactation	The processes of milk secretion by the maternal MAMMARY GLANDS after PARTURITION. The proliferation of the mammary glandular tissue, milk synthesis, and milk expulsion or let down are regulated by the interactions of several hormones including ESTRADIOL; PROGESTERONE; PROLACTIN; and OXYTOCIN.	Lactation, Prolonged,Milk Secretion,Lactations, Prolonged,Milk Secretions,Prolonged Lactation,Prolonged Lactations
D011247	Pregnancy	The status during which female mammals carry their developing young (EMBRYOS or FETUSES) in utero before birth, beginning from FERTILIZATION to BIRTH.	Gestation,Pregnancies
D001826	Body Fluids	Liquid components of living organisms.	Body Fluid,Fluid, Body,Fluids, Body
D005260	Female		Females
D005508	Food Deprivation	The withholding of food in a structured experimental situation.	Deprivation, Food,Deprivations, Food,Food Deprivations
D006041	Goats	Any of numerous agile, hollow-horned RUMINANTS of the genus Capra, in the family Bovidae, closely related to the SHEEP.	Capra,Capras,Goat
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia
D012417	Rumen	The first stomach of ruminants. It lies on the left side of the body, occupying the whole of the left side of the abdomen and even stretching across the median plane of the body to the right side. It is capacious, divided into an upper and a lower sac, each of which has a blind sac at its posterior extremity. The rumen is lined by mucous membrane containing no digestive glands, but mucus-secreting glands are present in large numbers. Coarse, partially chewed food is stored and churned in the rumen until the animal finds circumstances convenient for rumination. When this occurs, little balls of food are regurgitated through the esophagus into the mouth, and are subjected to a second more thorough mastication, swallowed, and passed on into other parts of the compound stomach. (From Black's Veterinary Dictionary, 17th ed)	Rumens