Available Online: http://www.ejpau.media.pl/volume4/issue2/veterinary/abs-02.html
KIDNEYS ADAPTATION OF KID AND CALF NEWBORNS TO NATREMIA REGULATION
Wies³aw F. Skrzypczak, Dariusz Drze¿d¿on
The experiment was carried out by means of clearance methods on 8 kids of Bia³a Szlachetna breed and 10 calves of black–white breed in the period of the first 14 days of their life. The goal of the examination was to specify the kidneys ability to regulate natremia. It was proved that goats’ and calves’ kidneys have the ability to keep natremia as early as from the moment of birth, yet the dynamics of kidneys functional changes in this period differs depending on the species of animal. The stabilisation of glomerular filtration rate and tubular sodium resorption in kids` kidneys take place in the first week of their life. It is the most difficult period to keep water-electrolyte homeostasis of organisms of these animals. Low effectiveness of sodium saving in calves kidneys was found, which may be the reason for limited adaptative abilities of these animals in their neonatal period.
Key words: kidneys, neonatal period, adaptation, glomerular filtration rate, tubule resorption, excretion, sodium, natremia.