[Manganese levels in biological materials from dairy cows].
Manganese in serum, hair and excrements of 2,720 dairy cows was determined under the practical conditions of animal husbandry. Mn content in the above-mentioned materials indicated the state of sufficient supply in 1,480 dairy cows and Mn deficiency in 1,240 dairy cows. The results of Mn content in the followed materials obtained from dairy cows in a different state of organism supplying are presented in Tabs. I-III. Sufficiently supplied dairy cows (Tab. I, Ist group) displayed a significantly higher (P < 0.01) content of Mn in serum equal to 0.042 mg/l with 95% interval of reliability, of the mean value (95% IR) 0.039-0.046 mg/l compared with the pooled group of deficient dairy cows (K) with the content of Mn in serum 0.037 mg/l and 95% IR in the range of 0.034-0.040 mg/l of serum. Mn content in hair (Tab. II) of sufficiently supplied dairy cows (Ist group) exceeds the limit value 7.0 mg/kg DM as for both the mean value and the 95% IR. The content of this element in dairy cows in the state of primary and secondary deficiency (groups II and IV) lies below the limit value within the range. The IIIrd group of dairy cows, which was in the state of depletion, contained Mn above the limit value. The dynamic process of deficiency development is in progress in this group of dairy cows, indicated by a reduced content in serum and excrements and for time being a still sufficient content in hair which is expected to decline with time and further growth and eventually lead to primary deficiency.(ABSTRACT TRUNCATED AT 250 WORDS)
Sviatko
P
P
Ustav fyziológie hospodárskych zvierat SAV, Kosice.
Hiscáková
M
M
D000818:Animals; D002417:Cattle / Q000378:metabolism*; D003612:Dairying; D005243:Feces / Q000737:chemistry; D005260:Female; D006197:Hair / Q000737:chemistry; D008345:Manganese / Q000032:analysis*
D008345:Manganese
Obsah mangánu v biologickom materiáli dojníc.