Effect of weight at slaughter and breed on beef intramuscular lipid classes and fatty acid profile

Abstract

The effect of slaughter weight and breed on the composition of intramuscular fat (IMF) of seven Spanish cattle breeds was studied. Lipid classes and fatty acids were evaluated in young bulls of seven local Spanish cattle breeds, Asturiana, Avileñ a, Morucha, Parda Alpina, Pirenaica, Retinta and Rubia Gallega, slaughtered at a live weight of 320 kg (veal type) and 550 kg (yearling bull type). Higher slaughter weight and early maturating breeds produced higher IMF content in the longissimus muscle (P , 0.001), which was linked to a reduction in phospholipids, monoglycerides, diglycerides, cholesterol and free-fatty acids content, but an increase in triacylglycerols. Besides, heavier animals displayed a higher percentage of saturated and monounsaturated fatty acids (MUFA), but a lower polyunsaturated fatty acids (PUFA) percentage (P , 0.001). The increase in triglycerides (TG), saturated fatty acids (SFA) and MUFA illustrates the increasing importance of lipid storage as fattening proceeds and the acquisition of ruminal functionality. The feeding system based on cereals had a strong influence on the fatty acid profile, giving the studied beef a relatively high PUFA/SFA and n-6/n-3 ratios.

Effect of two Spanish breeds and diet on beef quality including consumer preferences

“…Parda de Montaña beef had lower percentages of linoleic acid (C18:2 n‐6) and PUFA, but higher percentages of stearic acid and oleic acid than Pirenaica steers. In contrast, Indurain et al found that Parda Alpina and Pirenaica cattle had the same intramuscular fat content and fatty acid composition when they were slaughtered at the same live weight. In the current study, intramuscular fat content differed by breed.…”

Seasonal variation in the fatty acid profile in meat of Sarda suckling lambs

“…The content of the SFA reported in this study is in line with previous observations in suckling lambs (Rassu et al 2015) but lower than values reported for heavier animals (Hajji et al 2016). This is probably because higher slaughter weight is usually associated with higher intramuscular fat and therefore with higher triglyceride lipid fraction (Indurain et al 2010). The influence of the month of slaughter was also significant (p < .05) for OBCFA (Table 3), with an increased concentration of 15:0, 17:0 and their correspondent isomers with a branched structure (iso and anteiso isomers) in the muscle of lambs reared in February (Table 2).…”

Особливості Жирової Тканини І Внутрішніх Органів У Бичків, Що Мають Різну Скороспілість Росту

“…призводить до зниження їх племінної цінності як за живою масою, середньодобовими приростами, якістю спермопродукції, так і дочок за відтворювальною здатністю (Uhnivenko, Petrenko, Nosevych, Tokar, 2016). Збільшення середньодобових приростів призводить до підвищення живої маси та вмісту жирової тканини у різних депо (Induriain et al, 2010;Nogalski et al, 2014;Legoshin et al, 2014). На сучасному етапі розвитку м'ясного скотарства в державі важливо визначати скороспілість швидкості росту бичків за середньодобовими приростами у віці від 8 до 12 місяців.…”