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procedure and to compare their production efficiency. Furthermore, the effect of both diets on the carcass parameters and chickens' state of health was evaluated in order to explore the possibility of replacing vegetable oils by Ca-salts of fatty acids. The experiment was carried out with 140 chickens divided into 2 groups each consisting of 70 chickens (35 males and 35 females). As the source of energy specially treated oils - Ca-salts of fatty acids - were used in diet of experimental group while the soy oil was used in control group. The experiment was terminated on the 42nd day of the fattening. The mean live weight of female and male chickens in the experimental group on the 42(nd) day was 2.11 kg and 2.20 kg, respectively; the weight of control females and males was 2.18 kg and 2.50 kg, respectively. Significantly lower live weight of males (p less than or equal to 0.01) was also reflected in the carcass yield 1448.70 g (p less than or equal to 0.05), in the weight of skinned thighs 444.01 g (p less than or equal to 0.01) and thighs without skin 395,68 g (p less than or equal to 0.01), and in the weight of upper thighs 204.54 (p less than or equal to 0.01) and lower thighs 191.14 g (p less than or equal to 0.05). No significant differences were found in the weight of breast muscles and abdominal fat. Despite the above differences in weights, no conclusive differences between the experimental and control groups of chickens were found in the yield of carcass and the yield of individual parts of carcass. Chickens' state of health examined on the basis of haematological and biochemical analyses of blood plasma were also evaluated in this study. The results of these analyses showed that either diet had no negative effect on chickens' metabolism and that both plant-based diets were suitable for the feeding of chickens. It was also found that the substitution of vegetable oils with Ca-salts of fatty acids in a feeding mixture produced no negative effects on the carcass characteristics or health status of chickens. However, the composition of a diet must reflect the difference between the energy values of oils and Ca-salts of fatty acids.

acta veterinaria brno

Plant-Based Diets Containing Ca-Salts of Fatty Acids and Their Influence on Performance, Carcass Characteristics, and Health Status of Broiler Chickens