PSX-27 The influence of technological stress on the biochemical status of lambs with different genotypes

Abstract Sheep breeding is accompanied by various technological processes, some of them are stress factors, and one of these factors is the weaning of lambs from mothers. The goal was to study the effect of technological stress on the biochemical status and growth indicators of lambs with different genotypes. Lambs were divided into three groups: pure-bred Romanov (n = 18), Katahdin (n = 7) and Argali hybrids (¼Argali × ¾Romanov, n = 17). Before weaning and 15 and 30 days after weaning, the lambs live weight was determined and the blood serum biochemistry analysis was conducted. Statistical analysis of the data was performed using the SPSSv.23. The effects of genotype and technological stress on body weight and biochemical status are statistically significant (P ≤ 0.001). The live weight of the lambs before weaning was: Romanov 15.88±1.20kg, Katahdin 22.23±0.91kg, and hybrids 14.32±1.03kg. The differences between hybrids with Katahdins and Romanovs were 55% and 39.9% (P ≤ 0.05). The average daily gain (ADG) before weaning in Romanov lambs was 153.0±12.0g, Katahdins 203.0±8.0g and hybrids 119±11.0g. As a result of lambs weaning from mothers, technological stress was accompanied by an increase urea blood serum level in lambs. In hybrids it averaged 6.61mmol/L, which is 57% more than before weaning (P ≤ 0.05). In Katahdin, Romanov and hybrid lambs during the adaptation period was observed an increase the blood cholesterol level by 7.08%, 23% and 18% respectively, and ADG in all groups was decreased and amounted in hybrids 72±5.0g, in Romanovs 83±5.6g and in Katahdins 110±4.3g. The results of the study showed that the reaction of lambs to technological stress depends on the genotype of the animal, and the adaptation process after weaning is accompanied by a decrease in growth intensity. Supported by the Russian Science Foundation (project №18–16–00079) and the Ministry of Science and Higher Education of Russia (theme №АААА-А18-118021590132-9).