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»
Roshchin V.A.
Scientific-Practical Center on Animal Husbandry,
Belarus National Academy of Sciences, Zhodino, Belarus
ABSTRACT. For the first and second experiments, there were formed three groups of piglets crossbred Yorkshire× Landrace (n=15) aged 45 and 103 days respectively. For the group I (control), the feed was balanced according to the norms (Institute of Animal Husbandry, Russia, 2003), for group II, taking into account the ratio of the total amount of essential amino acids and ME, for group III, on the same principle as that for II, but taking into account the availability of essential amino acids. Deficiency of essential amino acids was made up by introducing in feed the supplements of L-lysine, L-threonine and DL-methionine. The level of ME was controlled by introduction of rapeseed oil and grease feed. In the first experiment in the group III, the LWG of pigs was higher by 9.9% (P<0.05), but the feed consumption per unit of LWG was lower by 12%, compared with the control group. During fattening, the average LWG in group II were higher by 4.6% and in group III - by 11% (P<0.05), and the level of feed/LWG in groups II and III were lower by 3.5% and 8.8%, respectively vs control. In general, the balancing of feed for essential amino acids with regard to their availability had contributed to an increase in body weight of weaned piglets and rearing pigs by 9.9% and that of fattening pigs by 4.2%, and to decrease in the cost of feed by 10-12%, as compared with the control group. At the same time, the amount of metabolizable energy expended per unit of protein deposited in the body of pigs decreased by 14%.
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