engleski

Effects of dietary PBE oil on performance of broilers

The research was carried out on 225 one-day-old Ross 208 male broilers, who were divided into five groups. Chickens in each group were fed from 1st to 21st day with starter mixture that contained 22.67 % of crude proteins and 14.19 MJ/kg ME. From 22nd to 42nd day, chickens were fed with finisher mixtures containing 20.43% of crude proteins and 14.18 MJ/kg ME. Besides basic feedstuffs such as corn, soybean meal, fish meal, vitamin-mineral additive and methionine, finisher compositions differed in the content of poultry fat and PBE preparation (5.0%/0%, 4.5%/0.5%, 4.0%/1.0%, 3.5%/1.5% and 3.0%/2.0%). Fattening process lasted for 42 days, after which the chickens reach weight of 2479.52 +/- 123.31, 2369.76 +/- 204.96 g, 2175.76 +/- 191.99 g, 2210.68 +/- 135.93 g and 2250.00 +/- 108.77 g, respectively. Chicken growth during the fattening period is described by asymmetric S-function. According to the parameters of asymmetric S-function, it can be concluded that the larger portions of PBE preparation in mixtures stimulate the intensification of the progressive growth stage, but it finally results in decreased live chicken weight. Biological maximum of growth by chicken groups was 3.80 kg, 3.53 kg, 3.10 kg, 3.29 kg and 3.29 kg. PUFA n-6/PUFA n-3 ratio in the lipids of breast muscles was 2.95 +/- 0.48, 2.68 +/- 0.71, 1.93 +/- 0.40, 1.63 +/- 0.41 and 1.22 +/- 0.40, and in the lipids of thigh muscles 5.35 +/- 0.81, 4.05 +/- 0.68, 2.96 +/- 0.47, 2.10 +/- 0.28 and 1.60 +/- 0.37. Research results showed that the larger percentage of PBE preparation in mixtures, as a supplement for the poultry fat, effects on decrease of live chicken weight growth, but it creates more favourable PUFA n-6/PUFA n-3 ratio in the lipids of muscular tissue.

performance ; broiler ; PUFA n-6 ; PUFA n-3

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