OPPORTUNITIES TO IMPROVE THE CHARACTERISTICS OF MANURE LITTER IN POULTRY FARMS: 1. APPLICATION OF BACTERIAL-ENZYMATIC ADDITIVE IN LAYING HENS
Keywords:
laying hens, manure litter, treatment, bacterial-enzymatic additiveAbstract
The aim of this study was to establish the values of pH, moisture, nitrogen (NH4
+ -N; NO3
-
N; and
total N) and total carbon in the laying hens manure litter (LHML), treated by bacterial-enzymatic
product Micropan® Normal (Eurovix, Italy). The study has been carried out at the poultry farm of
the Agricultural institute – Stara Zagora for a period of 61 days, when the last sample was taken. The
treatment was done at the days 1, 15, 29, 40 and 54 of the experiment. The composite samples for the
purposes of laboratory analysis were taken at days 8, 12, 19, 26, 33, 40, 50, 54 and 61 of the experiment.
It was established that there were no significant differences between the experimental samples (ES)
and control samples (CS) average values of the pH (8.68 ± 0.23 and 8.75 ± 0.12, respectively). The
moisture of the ES decreased significantly (P < 0.001) by 35.4% in comparison with CS. The NH4
+
-N concentrations and the NH4
+ -N:total N ratio in the treated LHML decreased by 15.6% (n.s.; P =
0,128) and 34,6% (P < 0.01), respectively, whereas the treatment had no significant effect on the NO3
-
N concentrations. After day 19 the concentration of NH4
+ -N in treated litter decreased significantly
(P = 0.012) by 28.51%. There were significant increases in the percentages of the total N and total C in
the treated LHML by 35.03% (P < 0.01) and 31.34% (P < 0.001), respectively. The C:N ratio was 8.46 ±
0.60 and 8.64 ± 0.52 for ES and CS, respectively, with no significant differences.
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