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The aim of the present study was to determine the effect of an herbal supplement used in feed mixtures on the selected physical features and the chemical composition of broiler chickens’ bones in reference to antibiotic growth promoter. The experimental material was provided by 180 ROSS broiler chickens. One-day-old nestlings were divided randomly into 2 control groups and 4 experimental groups, in three replications, 10 birds each. The feed mixtures (Starter and Grower/Finisher types) were made of corn and extracted soy meal and they also contained fodder yeast, soy oil, mineral additives, premixes (with an addition of growth promoters or without) and an addition of dried green forage or dried herbs. The mechanical properties of the bones were determined on the basis of the three-point bend test performed with the use of an Instron 4302 apparatus coupled with a computer. The test registers as a graph the dependence between the force acting perpendicularly to the long axis of the bone and its deformation. An examination was performed to determine maximum force, and the maximum elasticity force. The studies revealed that both the type and the amount of the herbs determined chickens’ growth and the physical and strength properties of their bones. The most beneficial effects were observed in feeding birds mixtures containing 1% of pansy, since the values noted for all traits and indices were not worse than the effects obtained in the control group receiving antibiotic growth promoter, and in some cases they were even higher. The least positive results occurred in supplementing feed mixtures with 3% of nettle.
Samples of 3 domestic cultivars of bean seeds (Warta, Raba and Narew) were used to determine the content of dry matter, protein, fat, ash, amino acids and reactive lysine. Essential amino acid index (EAAI) and limiting amino acid index (CS) were calculated as well. The samples were subjected to autoclaving or heating in a dryer for 10, 20, 30 or 40 min at the temperature of 121oC. Next, the content of dry matter and reactive lysine in the samples were determined. It was observed that processing led to an increase in the content of dry matter in the seeds and to a decrease in the content of reactive lysine. The losses of reactive lysine were similar in both processes, amounting to 11–20%, regarding the content of the component in dry matter. Statistically significant changes were noted after 30 or 40 min of processing.
The objective of this study was to evaluate the effect of dietary conjugated li- noleic acid (CLA) and false flax (Camelina sativa) seeds oil (FO), as a replacement for sunflower oil, on the performance of broiler chickens. Experiment was carried out on 96 chickens randomly divided into four groups - control: fed on the diet with sunflower oil (SO) and three experimental: fed on the diet with addition of CLA (2,86% starter, 4,32% grower) and fed on the diet with addition of CLA (1,43% starter, 2,16% grower) and SO or FO (1,43% starter, 2,16% grower). Daily weight gain, daily feed consumption, feed conversion ratio as well as final body weight were measured. No significant differences in growth performance were observed in the first period of experiment. In older birds dietary treatment with SO+CLA and FO+CLA daily weight gain, feed consumption and final body weight slightly increased. No significant differences in the values of analyzed parameters between SO, CLA and SO+CLA groups were observed. In conclusion, the results indicated that false flax oil and CLA can replace sunflower oil in chickens' feeding, and demonstrated the effectiveness of false flax oil on the growth performance of broiler chickens.
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