Author:
,Kibkalo L. I.,Ostrikova E. N.,
Abstract
Currently, great opportunities have been identified for increasing beef production using castrated Holstein bulls. Under the conditions of industrial technology, when rearing and fattening animals to high weight standards, the quality of meat is important, because it depends on many factors. In this regard, the purpose of the research was to study the quality of beef of Holstein steers of diff erent genealogical linear origin during their intensive rearing and fattening up to 15 months of age and a live weight of 500 kg and above under industrial technology conditions. In a comparative aspect, the indicators of control slaughter of animals and the morphological composition of carcasses were studied. We took into account the slaughter weight, the weight of the carcasses, and calculated the slaughter yield. The presence of dry matter, protein, moisture, and ash in the beef was determined. The presence of nonessential and essential amino acids was determined. Moisture capacity, color, pH, tenderness (hardness) of beef were studied in the longissimus dorsi muscle. It was established that the experimental steers reached a live weight of 512–529 kg by the age of 15 months. Almost all control slaughter indicators were higher for steers of the line Refl ection Sovereign 198998. Their meat is more valuable in nutritional terms, because had the best performance in terms of chemical composition. It was noticed that the amount of tryptophan and hydroxyproline practically did not change depending on the genealogical line affi liation of the animals. At the same time, the protein quality indicator was higher in steers of the line Refl ection Sovereign 198998 (4,83 versus 4,67 and 4,71). The pH of beef in animal groups was at the level of 5,62–5,64. The beef of steers of the line Reflection Sovereign 198998 was somewhat more tender, and the moisture capacity was higher. The experimental results obtained allow us to recommend the use of castrated Holstein bulls to produce high-quality beef.
Publisher
PANORAMA Publishing House
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