title: Estimation of the intramuscular fat content of m. longissimus thoracis in crossbred beef cattle based on live animal measurements.
abstract: The objective of this study was to determine the usefulness of live animal measurements in estimating the intramuscular fat (IMF) content of m. longissimus thoracis (MLT) in beef cattle. Live animal measurements were performed in young crossbred bulls (96) and steers (59), the offspring of Holstein-Friesian (HF) cows and beef bulls (Limousin, Hereford and Charolais), at the end of the fattening period. The content of intramuscular fat was determined in samples from MLT by chemical analyses. A prediction model was developed by stepwise regression. In the validation model, the values of R2=0.74, RMSE=0.37% were determined. The results indicate that selected biometric (chest width, chest girth) ultrasound measurements (thickness of subcutaneous rump and back fat) and selected blood parameters (triglycerides) can be used to predict IMF content with satisfactory precision and accuracy. The analyzed parameters could constitute a valuable tool in the process of selecting beef quality traits and determining the slaughter value of young beef cattle.
authors.affiliation: Department of Cattle Breeding and Milk Quality Evaluation, Faculty of Animal Bioengineering, University of Warmia and Mazury in Olsztyn, ul. Oczapowskiego 5/137, 10-719 Olsztyn, Poland.
authors.forename: Zenon
authors.initials: Z
authors.lastname: Nogalski
authors.affiliation: Department of Cattle Breeding and Milk Quality Evaluation, Faculty of Animal Bioengineering, University of Warmia and Mazury in Olsztyn, ul. Oczapowskiego 5/137, 10-719 Olsztyn, Poland. Electronic address: paulina.pogorzelska@uwm.edu.pl.
authors.forename: Paulina
authors.initials: P
authors.lastname: Pogorzelska-Przybyłek
authors.affiliation: Department of Systems Engineering, Faculty of Engineering, University of Warmia and Mazury in Olsztyn, Oczapowskiego 2, 10-719 Olsztyn, Poland.
authors.forename: Ireneusz
authors.initials: I
authors.lastname: Białobrzewski
authors.affiliation: Department of Industrial Commodity, Basics of Techniques and Energy Management, Faculty of Food Sciences, University of Warmia and Mazury in Olsztyn, Pl. Cieszyński 1, 10-719 Olsztyn, Poland.
authors.forename: Monika
authors.initials: M
authors.lastname: Modzelewska-Kapituła
authors.affiliation: Department of Cattle Breeding and Milk Quality Evaluation, Faculty of Animal Bioengineering, University of Warmia and Mazury in Olsztyn, ul. Oczapowskiego 5/137, 10-719 Olsztyn, Poland.
authors.forename: Monika
authors.initials: M
authors.lastname: Sobczuk-Szul
authors.affiliation: Department of Animal Nutrition and Feed Sciences, Faculty of Animal Bioengineering, University of Warmia and Mazury in Olsztyn, ul. Oczapowskiego 5/248, 10-719 Olsztyn, Poland.
authors.forename: Cezary
authors.initials: C
authors.lastname: Purwin
mesh_terms: D000273:Adipose Tissue / Q000737:chemistry*; D000818:Animals; D001823:Body Composition; D002417:Cattle; D004041:Dietary Fats / Q000032:analysis*; D005260:Female; D063427:Food Quality; D016014:Linear Models; D008297:Male; D008962:Models, Theoretical; D018482:Muscle, Skeletal / Q000737:chemistry*; D010641:Phenotype; D000069466:Red Meat / Q000032:analysis*
chemical_list: D004041:Dietary Fats
keywords: Beef; Blood parameters; Intramuscular fat; Selection; Ultrasound