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The efficacy of zinc application in the treatment and prevention of diarrhoea in the weaning period of piglets has been demonstrated. However, beside this positive effect some authors suggested the possibility of harmful effects of zinc oxide supplementation on the environment and public health. The aims of the study were to evaluate, in experimental and field conditions, the influence of different doses of ZnO on productivity, losses and body weight gain (b.w.g.) as well as the Zn level in different tissues of pigs. During the first stage of the study three groups of weaned piglets were fed high doses (2 500, 3 000 and 3 500 ppm) of ZnO for 7 days prior to and 14 days after weaning. The best results were observed in the group fed with highest doses of ZnO, in this group daily b.w.g. was 26 grams higher in comparison with the controls. Tissue samples from muscles and selected organs (liver, kidneys, pancreas, heart and brain) were taken from experimental pigs at slaughter after the animals had reached a body weight of about 100kg. The results of toxicological examination indicated that 14-days of treatment with high doses of ZnO have no influence on zinc concentration in tissues. Field experiments aimed at safety and evaluation of the usefulness of ZnO on the prophylaxy of post weaning diarrhoea, performed in 8 farms, demonstrated reduction of diarrhoea symptoms from about 48 to 15%. In summary, it may be concluded that short-term application of ZnO in prevention of post weaning diarrhoea is efficient for pigs and does not influence zinc concentration the fatteners tissues.
The objective of this study was to determine the effect of dietary supplementation with a blend of organic acids, zinc oxide and the B-Safe® herbal product on nutrient digestibility, nitrogen balance and growth performance in weaned piglets. Nutrient digestibility was determined by a simple balance method, on 24 weaners (PIC) with average body weight of 28 kg, divided into four groups of six animals each. A five-day experimental period was preceded by a seven-day adjustment period. A production trial was carried out on 1279 weaned piglets that were fed four experimental diets: a control diet without feed additives (A), a diet supplemented with a blend of organic acids at 5 kg t⁻¹ (B), a diet supplemented with zinc oxide at 3 kg t⁻¹ (C), and a diet supplemented with the B-Safe® herbal product at 3 kg t⁻¹ (D). The experiment lasted 19 days. A mashed starter diet was offered ad libitum. The body weights of piglets and feed intake were determined at the beginning and at the end (day 19) of the experiment. The inclusion of an organic acid blend, zinc oxide and the B-Safe® herbal product in weaner diets highly significantly improved the digestibility of crude protein, crude fat (P ≤ 0.01) and organic matter (P ≤ 0.05). Nitrogen retention was higher in weaners fed a diet supplemented with zinc oxide at 3 kg t⁻¹ (group C) than in control group animals (20.15 vs. 17.59 g, P ≤ 0.01). The feed conversion ratio (FCR) was highly significantly lower in weaned piglets fed zinc oxide or B- Safe® at 3 kg t⁻¹, compared with the control group (1.50 and 1.47 vs. 1.70 kg kg⁻¹).
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