Effects of excessive magnesium amounts and fat and oil addition on magnesium, calcium and phosphorus balance in ruminants
1998
Chrenkova, M. | Sommer, A. | Pajtas, M. | Polacikova, M. | Chovanec, J. | Pavlik, V.
Metabolic experiments were conducted on young bulls at the live weight of 225 kg. The effect of magnesite added to model feed rations consisting of corn silage, alfalfa hay, barley groats, wheal groats and feeding salt was investigated as exerted on Ca, P and Mg balance in young bulls. Possibilities of eliminating negative Mg effects by use of waste fat and rapeseed oil were also studied. Mg uptake by animals was five times higher in comparison with recommended rations. Mg : Ca ratio was 34 : 1. Excessive applications of Mg in feed resulted in its higher output (P 0.01) in urine and excrements. Mg digestibility expressed as per cent of Mg uptake was not related to the amount of ingested Mg. The addition of waste fat and rapeseed oil to feed rations did not reduce Mg resorption from the digestive tract of animals. The excessive amounts of Mg did not influence Ca balance but they induced higher P output in urine and excrements. The addition of waste fat and rapeseed oil to feeds had positive effects on Ca and P balance while mainly rapeseed oil had a significant effect on the level of P retention from P digested in the animal organism.
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