Beef production and chemical composition of muscle tissue of steers when using a tissue biostimulant

Abstract

The findings of the research aimed at determining the effect of different doses of a tissue bio-stimulant on beef production and the chemical composition of muscle tissue in Black Pied steers are discussed. The experiment was conducted in 2021 on fattening steers on the beef farm of the AO Uchkhoz Prigorodnoe in the City of Barnaul. The tissue bio-stimulant made from slaughterhouse offal of velvet antler deer was administered subcutaneously to animals of the trial groups in the lower third of the neck from the 6th to the 14th month of rearing, monthly, with 30 days’ interval in different doses according to the following schedule: in the 1st trial group at 6-11 months - 8.0 mL per head, 12-14 months - 10.0 mL head; in the 2nd trial group at 6-11 months - 12.0 mL head, 12-14 months - 15.0 mL head; in the 3rd trial group at 6-11 months - 16.0 mL head, 12-14 months - 20.0 mL head. Physiological salt solution was injected to the animals of the control group: at 6-11 months - 12.0 mL head, 12-14 months - 15.0 mL head. It was found that the use of the tissue bio-stimulant in the 2nd trial group was the most effective and contributed to an increase of carcass length by 1.9% (p ˂ 0.01), thigh length - by 5.3% (p ˂ 0.001), thigh girth - by 9.5% (p ˂ 0.001), thigh fullness index - by 5.1% (p ˂ 0.01), carcass fullness index - by 2.4% (p ˂ 0.01), increase of solid content in muscle tissue - by 6.3% (p ˂ 0.05), protein content - by 7.3% (p ˂ 0.05), tryptophan content - by 0.7% (p ˂ 0.05), and protein quality index increased by 5.5% (p ≤ 0.05) compared to similar values in the control group.