FOLIA VETERINARIA, 53, 3: 151—153, 2009 www.uvm.sk
pERFORmAnCE OF CHICKEnS FED DIETS COnTAInIng FUll-FAT SOyBEAn AnD nATURAl HUmIC COmpOUnDS Demeterová m.
University of Veterinary medicine, Komenského 73, Koice The Slovak Republic
demeter@uvm.sk
ABSTRACT
Theeffectoftoastedfull-fatsoybean(FFSB)(22% inweeks 1—5 and 27.5% in week 6, in proportion to substitute soybean mealandoil)indietssupplementedwithnaturalhumicsubstances (7gperkg—groupFFSB+H1throughoutwholeperiodandgroup FFSB+H2 in weeks 3—6) on performance, nutrient utilization and carcass yield were studied in broiler chickens under experimental conditions. lower body weight, weight gain, European EfficiencyIndex(p<0.001),carcassyield(p<0.05)andhigher feed conversion rate (p<0.05, p<0.01) were observed in the FFSB group in comparison to the control. Supplementation of FFSB diets with natural humic compounds tended to improve bodyweight,weightgain,carcassyieldandEuropeanEfficiency Index in comparison to the FFSB group. Key words: broiler; carcass; full-fat soybean; humic compounds; performance
Its processing aimed at inactivation of anti-nutritional factors and better utilization of energy and proteins is essential for its dietary use. Humic substances are natural organic compounds formed by decomposition of plant material and by microbial activity. The positive effect of humates on performance of poultry after their application in diets or in drinking water was described by a number of authors (4, 7, 9). The objective of the present study was to investigate the effect of supplementation of natural humic compounds on performance, nutrient utilization and slaughter characteristics in broiler chickens fed diets containing toasted full-fat soybean.
mATERIAl AnD mETHODS
Two hundred one-day old broiler chicks (Ross 308 hybrid) were divided to 4 groups (50 chicks per pen) and fed ad libitum the diets based on corn and soybean meal according to the growth phases (control group). Diets in three experimental groups were supplemented with full-fat soybean (FFSB) (22 % in starter and grower, and 27.5 % in finisher) in quantities meeting the fat level reached in control diet by using oil. Two experimental groups were given natural humic substances (total humic acids 60 %, free humic acids 48 %, calcium formate) in the concentration of 0.7 %, in group FFSB + H1 throughout the whole experiment (42 days) and in group FFSB + H2 in the 2nd and 3rd phase of the experiment (the same mixture as in FFSB group was used in the 1st phase). Neither antibiotic growth promoters nor anticoccidials were added to the diets. All diets were balanced to the nitrogen and energy content. All birds were weighed and the feed consumed was recorded

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