engleski

Body and m. longissimus dorsi fat content in Simmental bulls

Simmental breed is known as a dual purpose breed with good intramuscular fat content. In this experiment we have focused on fatty tissue share in thoracic rib cut (7th to 9th rib) and chemical fat (ether extract) in musculus longissimus dorsi (MLD). The trial comprised 710 young bulls, the progeny of sires chosen for artificial insemination, during the period of 13 years. Average fatty tissue share in the whole period was 14, 09% and chemical fat 3, 12%. Correlation between fatty tissue share and chemical fat was r = 0, 36 ; correlations between slaughter live body weight (BW) with fatty tissue share and chemical fat were r = 0, 33 and r = 0, 10 respectively. Although the correlations were low they were all statistically significant (p < 0, 01). Only MLD protein content had high negative and significant correlation with chemical fat (r = -0, 75 ; p < 0, 01). Influence of year and sire on fatty tissue share and chemical fat was significant (p < 0, 001). Despite of slight increase of slaughter live BW in the course of the years, the increase of fatty tissue share and chemical fat was more pronounced. This trend should be taken into account when sires have to be chosen for artificial insemination. Excess of fatty tissue reduces the market value of retail cuts and doesn't meet consumer preferences.

m. longissimus dorsi; fat; simmental bulls

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