Mineral concentration in forage of diploid red clover varieties related to mineral requirements of diary cows
2005
Drobna, J.(Vyskumny ustav rastlinnej vyroby, Piestany (Slovak Republic))
The mineral concentration and its comparison with standardized need by dairy cows were studied in forage of 21 diploid varieties of worldwide red clover assortment. The experimental work was carried out in the years 2001 and 2002 at Research Institute of Plant Production in Piestany. Contents of minerals (P, K, Mg, Ca, Mn, S, Fe, Cu) were determined in hay dry matter by chemical analysis. Based on mineral concentration of red clover forage and standardized need by dairy cows, it was found the difference between the mineral substances capacity in plants and animals requirements. It was presented by high content of potassium; the potassium offer exceeded need of animals 4-5 times. The forage of evaluated varieties was characterised by deficiency of phosphorus. Its shortage was even more expressed by high calcium excess, what was presented in unfavourable Ca:P rate. Concentrations of magnesium and iron were over-limited, and concentration of manganese was insufficient. The contents of sulphur and copper were in most of varieties in optimum and fulfilled the demand of dairy cows. The reached results showed the relatively high variability in mineral concentration among evaluated varieties. The greatest differences were found in concentrations of iron, manganese and copper. Besides of contents of iron and manganese, lower mineral concentration of other elements was determined in the first cut.
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