Naslov
Influence of inorganic and organic dietary zinc on its concentration in blood serum, bones and hair and on catalytical activity of some serum enzymes in pigs

Autori
Rupić, Vlatko ; Ivandija, Libuška ; Luterotti, Svjetlana ; Dominis-Kramarić, Miroslava

Izvornik
Acta Veterinaria Brno (0001-7213) 66 (1997), 2; 75-85

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
growth. pigs. zinc sulphate. zinc methionate. bioavailability. nutrition

Sažetak
The influence of dietary zinc originating from either inorganic or organic source on zinc-depleted pigs was investigated. Within the 30 d period preceding the trial, all the animals (German Landrace x Pietrain x Large White x Swedish Landrace weaned crossbreds) were depleted of zinc and divided into three groups, 14 animals in each. During the experimental fattening period (105 d), the control group received no extra zinc, whereas the two trial groups were fed a diet with zinc supplement either as inorganic salt (ZnSO4) or metalo-organic chelate (zinc methionate). On average, the respective supplements contained 84.3 mg Zn.kg(-1) diet and 40.9 mg Zn.kg(-1) diet. Evaluation of the nutritional effects of zinc was based on its concentration in the blood serum, bone and hair. Moreover, the effect of zinc on catalytical activity of alkaline phosphatase, aspartate aminotransferase, alanine aminotransferase and gamma-glutamyltransferase in serum was studied. A decrease of catalytical activity of both aspartate aminotransferase and alanine aminotransferase was found along with signs of parakeratosis on the skin of control animals but no correlation with serum zinc was established. In contrast to this finding, a linear correlation between catalytical activity of alkaline phosphatase and of gamma-glutamyltransferase and serum zinc level was found with the respective correlation coefficients of 0.90 and -0.72. Nutritional efficiency of diet zinc was evidenced by both higher (P < 0.05) zinc level in blood serum, bone and hair and by the state of hepatobiliary tract and bones, and favourable performance results of trial animals compared to controls. None of trial animals suffered from any health disturbances. Progressive parakeratosis appeared, however, in control animals and lasted during the second month of the trial. It was accompanied by deterioration of performance data of the affected animals. Our data suggest that bioavailability of zinc from the chelate was better than of that derived from inorganic salt, particularly in the period of rapid growth. This presumbaly resulted in reduced elimination of zinc. Based on better nutritional efficiency in pigs and on ecological benefits, zinc methionate should be preferred to ZnSO4 as a zinc containing diet additive. [References: 28]

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA