Avtor/Urednik     Gašperlin, B; Zadnik, T; Jazbec, I; Žust, J
Naslov     Vpliv kationsko-anionskega razmerja v obrokih na dinamiko kalcija, anorganskega fosforja in magnezija v krvi molznic v obporodnem obdobju
Prevedeni naslov     Effects of dietary cation-anion differences on serum calcium, phosphorus and magnesium concentrations in periparturient dairy cows
Tip     članek
Vir     Slov Vet Res
Vol. in št.     Letnik 39, št. 3-4
Leto izdaje     2002
Obseg     str. 219-29
Jezik     slo, eng
Abstrakt     The aim of the present study was to investigate the influence of two dietary cation-anion differences (DCAD) on the serum calcium, phosphorus and magnesium in forty dairy cows directly endangered by parturient paresis. Cows were chosen from three farms where altogether 736 Friesian dairy cows were bred. They were randomly divided into two groups. The control - cation group (n = 15) received a ration with average DCAD 243 +- 132 mEq/kg and the experimental - anion group (n = 25) received a ration with average DCAD - 28 +- 136 mEq/kg of DM. We found that calcium level in serum of the experimental group compared to controls was statistically significantly higher (P = 0.0095) two and one day (P = 0.0007) before parturition and the second day after parturition (P = 0.0296) which confirmed positive effects of anionic diet on mechanisms regulating calcium absorption from intestines and mobilization from the bones during the most critical days before parturition and immediately afterwards. The anionic salts supplement did not significantly statistically affect the level of serum phosphorus and magnesium. However, we established the already known around parturition period decrease of serum phosphorus level in both groups of cows, while mean values of these blood elements were during the experiment at an adequate level. Five cows were affected with parturient paresis: two (13.3 %) from controls and three (12.0 %) from the experimental group. The occurrence of the disease was confirmed also by serum analyses which showed compared to clinically normal animals statistically significantly lower calcium (P = 0.0332) and phosphorus (P = 0.0411) concentrations. Considering the analyses of the ration and the fact that all cows developed the disease after parturition, it is our opinion that the major cause for the occurrence of the disease also in the group that was fed anionic salts was insufficient calcium intake after parturition.
Izvleček     V raziskavi smo ugotavljali vplive kationsko-anionskega razmerja v obrokih (DCAD) na vsebnost serumskega kalcija, fosforja in magnezija pri 40 molznicah, neposredno ogroženih od poporodne pareze. Krave smo izbrali na treh farmah, kjer redijo 736 molznic črno-bele pasme in jih naključno razdelili v dve skupini. Kontrolna (kationska) skupina 15 krav je dobivala obrok s povprečno DCAD 243 +132 mEq/kg, poskusna (anionska) skupina 25 krav pa obrok s povprečno DCAD - 28 ± 136 mEq/kg suhe snovi. Ugotovili smo, da je bila vrednost kalcija v krvi molznic testne skupine v primerjavi s kontrolno statistično značilno povečana dva (P = 0,0095) in en dan (P = 0,0007) pred porodom ter drugi dan po porodu (P = 0,0296), kar potrjuje pozitivne učinke anionoske diete na mehanizme, ki uravnavajo absorpcijo kalcija iz črevesja in mobilizacijo iz kosti v najbolj kritičnih dnevih pred telitvijo in neposredno po njej. Dodatek anionskih soli pa ni pomembno vplival na raven serumskega anorganskega fosforja in magnezija. Ugotovili smo le poznano obporodno znižanje ravni serumskega fosforja pri kravah v obeh skupinah, sicer pa so bile povprečne vrednosti teh prvin v krvi ves čas poskusa na ustrezni ravni. Za poporodno mrzlico je klinično zbolelo pet krav; in sicer dve (13,3 %) iz kontrolne in tri (12,0 %) iz poskusne skupine. Da so krave obolele za tipično poporodno mrzlico, potrjujejo tudi analize krvnega seruma, kjer smo v primerjavi s klinično zdravimi živalmi ugotovili statistično značilno nižje vrednosti kalcija (P = 0,0332) in anorganskega fosforja (P = 0,0411). Glede na analizo krmnega obroka in na dejstvo, da so vse krave zbolele v poporodnem obdobju, utemeljeno domnevamo, da je bil najpomembnejši vzrok za nepredviden pojav bolezni tudi v skupini krav, ki je dobila anionske soli, premajhna količina kalcija v obroku po porodu.
Deskriptorji     CALCIUM
PHOSPHORUS
PUERPERIUM
ANIMAL FEED
PARESIS
SODIUM
POTASSIUM
CHROMIUM
SULFUR
CATTLE