Influence of iodine and selenium deficiency on macro and trace element content of ewe's milk (Blackhead dairy breed)
1999
Petrova, N. | Angelov, L. | Todorova, D. | Dochevski, D. (Institut of Animal Science, Kostinbrod (Bulgaria))
A study was carried out to establish the effect of Se and I supplementation in feeding of sheep on milk production, trace (Se, I, Zn) and macro (Ca, Mg) elements concentration of milk during the first 56 days of lactation.20 ewes divided into two groups were fed according to ARC norms with different amounts of Se and I during the experiment.The daily ration included 0.08 mg Se/kg DM and 0.10 mg I/kg DM.The control group received additionally 0.15 mg/Se/day as NaHSe03 and 0.20 mgl/day as KI.The low levels of Se and I in the ration of sheep led to 16.1% decrease of daily milk production.The amount of Se and I for all investigated period in Se-I deficiency group decreased twice and two third respectively.The influence of Se-I deficiency on Zn, Ca and Mg content of the sheep milk was negative for Zn content from 28th to 56th days of investigated period, positively for Ca content and negative for Mg content for all period.
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