Koncentracije kalcijuma, neorganskog fosfora i magnezijuma u krvnom serumu krava tokom tranzicionog perioda i pune laktacije

The objective of this study was to determine blood levels of macronutrients in Simmental cows (n=45) during the transition period and peak lactation. The experimental cows were assigned to three groups: Group A (n=15) including clinically healthy late gestation cows, Group B (n=15) comprising clinically healthy cows in the puerperium, and Group C (n=15) made up of clinically healthy peak lactation cows. Blood samples were collected from all experimental cows. Blood serum samples were analysed for calcium, magnesium and inorganic phosphorus levels using spectrophotometry. Blood levels of macronutrients were within the physiological range in all experimental cows. Blood concentrations of calcium, magnesium and inorganic phosphorus in cows in the puerperium were statistically significantly lower (p<0.05) compared with those in dairy cows during late gestation and peak lactation, which may indicate the increased use of these macronutrients in early lactation for the mammary gland. The results show that the homeostasis of the macronutrients tested in the blood of transition and peak lactation dairy cows was maintained, suggesting their adequate supply from alimentary sources.Cilj ovog rada je bio da se odrede koncentracije kalcijuma (Ca), neorganskog fosfora (P) i magnezijuma (Mg) u krvi, indikatora stanja metabolizma neorganskih materija kod mlečnih krava Simentalske rase (n=45) u tranzicionom periodu i tokom pune laktacije. Ispitivane krave su podeljene u tri grupe. U prvoj grupi (n=15) nalazile su se klinički zdrave visoko gravidne krave, u drugoj grupi klinički zdrave krave (n=15) u puerperiumu, dok su treću grupu (n=15) činile klinički zdrave krave u punoj laktaciji. Od svih ispitivanih krava uzeti su uzorci krvi. Iz dobijenog krvnog seruma određivane su koncentracije kalcijuma, magnezijuma i neorganskog fosfora spektrofotometrijskom metodom. Vrednosti ispitivanih makroelemenata u krvi su bile u fiziološkim granicama kod svih ispitivanih grupa krava. Koncentracije kalcijuma, magnezijuma i neorganskog fosfora u kvnom serumu kod grupe krava u puerperiumu bile su u statistički značajno manjem (p