Meat productivity and beef quality of Aberdeen-Angus bulls at different levels of estradiol in blood serum
Year: 2025
Type: article
Abstract: . The studies were conducted on Aberdeen Angus bulls. Animals were divided into three groups according to serum estradiol levels by the percentile method: I Group - up to the 25th percentile; II Group - within the 25th-75th percentile; III Group - above the 75th percentile. The range of serum estradiol concentrations in bulls of I group was from 0.131 to 0.148 nmol/l, II group from 0.150 to 0.162 nmol/l, III group from 0.164 to 0.175 nmol/l. Serum estradiol levels were determined by enzyme-linked immunosorbent assay using an Infinite F200 PRO automated microplate analyzer. A control slaughter was performed at 18 months of age to study the meat traits of the bulls. Pre-slaughter live weight, carcass weight and yield, internal raw fat weight and yield, and slaughter weight were measured. The absolute weight and yield of the edible part (flesh), including muscle and fat tissue, and the inedible part: bones, cartilage and tendons were determined based on the results of deboning and skinning the carcass. The carcass meatiness index (meat yield per 1 kg of bone), meat yield per 100 kg of pre-slaughter live weight, per 1 kg of inedible part of the carcass, muscle yield per 1 kg of bone, per 100 kg of pre-slaughter live weight, the ratio of muscle and fat tissues were measured by calculation. The mass fractions of moisture, protein and fat were determined. In addition, the content of complete proteins (by tryptophan) and incomplete proteins (by oxyproline) were determined in the Longissimus dorsi muscle. It was found that animals with maximum levels of estradiol in blood serum were superior to their counterparts with minimum levels of this indicator in terms of carcass bone weight. It was noted that blood serum estradiol levels of Aberdeen Angus bulls had no significant effect on meat productivity indices. At the same time, the effect of estradiol level on the indicators of fat metabolism was found, which was expressed in the increase of internal fat weight and relative fat content in the carcass against the background of the increase of energy value of the carcass flesh. The ambiguous nature of the effect of the estradiol level on the amino acid and fatty acid composition of the Longissimus dorsi muscle was also noted, with a steady tendency to increase the synthesis of unsaturated palmitic acid and decrease the level of the nonessential amino acid - tyrosine.
Source: Veterinaria i kormlenie
Language: English
Subfield: Animal Science and Zoology
Domain: Life Sciences
SDG: Zero hunger
Open Access status: diamond
OpenAlex ID: W4408147609