Всероссийский научно-исследовательский институт физиологии, биохимии и питания животных – филиал Федерального государственного бюджетного научного учреждения «Федеральный научный центр животноводства – ВИЖ имени академика Л.К. Эрнста»
ABSTRACT. The aim was to study the effectiveness of the application of a new biologically active additive, lithium ascorbate, to increase the stress resistance and productivity of broiler chickens in fattening period. The study was conducted on four groups of broiler chickens, 80 chickens each. The drug was administered in III, II and I groups, starting at the 2-week age (brooding period) for 4 weeks with food at the dose 10, 5 and 1 mg/kg body weight, respectively. In the control group, the preparation was not administered, the weight of the given food for the period of the experiment in all groups was set in accordance with the age period. The live weight of chickens in groups I, II and III at the age of 42 days was by 4.5, 5.7 (P<0.05), 6.2% (P<0.05) respectively higher vs control. In all experimental groups, there was a tendency of increasing the number of erythrocytes, hemoglobin, which indirectly indicates the activation of hemopoiesis by lithium ascorbate. The higher content of chickens in the blood serum of the experimental groups of the globulin fraction (P<0.05) promoted the strengthening of the protective functions of the organism and a higher viability of chickens. The survival of the chickens at the end of the experiment in groups III and II was 100%, and in control it was reduced by 5% (P<0.05), in comparison with these groups. The chicks of the experimental groups exceeded the control in terms of productivity indices, by weight of gutted carcass (P<0.05) and by weight of muscle tissue (P<0.05). During the period of fattening (42 days), the consumption of feed in in groups I, II groups was more by 2.9 and 1.6%, but the yield of gutted carcass in groups I, II and III was higher vs control (P<0.05) and the feed consumption per 1 kg of the increase in live weight in III, II и I groups on the average was 3.6% less than in the control group. Thus, the use of lithium ascorbate positively influences the growth, development and the killer qualities of chickens. Thus, the use of lithium ascorbate positively influences the growth, development and the quality traits of chickens.
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