Dietary cation-anion difference in rations of lactating cows
2002
Rajcevic, M. (Poslovni sistem Mercator d.d., Ljubljana (Slovenia)) | Ilc, A. (Mesnine dezele Kranjske, Kocevje (Slovenia)) | Rajcevic, U. (Ljubljana Univ. (Slovenia). Medical Fac.)
Dietary cation-anion difference (DCAD) in rations for cows in lactation was studied. It was estimated for each phase of lactation in winter and in summer. Oetzel's equations (1993) DCAD 1 (meq/kg dry matter)=(K+Na)-(Cl+S) and DCAD 2= (K+Na)-Cl respectively were used. In the winter season cows in lactation were grouped in four production groups, and in the summer season in three. In the winter season the content of potassium and chlorine was increased, while the content of sodium was sufficient only in the first group and the content of the sulphur was a bit defficient all of the season. DCAD 1 in winter rations varied between 246 and 311 meq/kg dry matter, and DCAD 2 between 363 and 417 meq/kg dry matter. The increase of dietary cation-anion difference was clearly expressed from the beginning towards the end of the lactation. In the summer period the contents of potassium and chlorine in rations were in surplus, there was enough sodium only in the group with the highest production, and enough sulphur in all groups. DCAD 1 varied between 204 and 211 meq/kg dry matter in all production groups, and DCAD 2 varied between 335 and 342 meq/kg dry matter. Obtained results are showing significance of further research in this field.
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