Intramuscular fatty acid composition in beef from Aosta cattle breeds

The aim of this research was to compare fat quality of three categories of the Aosta cattle breeds by fatty acid composition. Samples of longissimus thoracis et lumborum from 12 calves, 11 young bulls and 11 cows of Aosta Red Pied and Black Pied were bought at retail. Fatty acids content showed in most cases, except for C18:1, significant differences between the three categories. Veal calves had the lowest proportion of SFA and highest of PUFA, therefore they had the best PUFA/SFA ratio but the worst n-6/n-3 ratio due to the highest proportion of C18:2n-6. Besides veal calves was healthier by having best atherogenicity and thrombogenicity indices. Black Pied young bulls, in comparison to Red Pied young bulls, showed a significant lower proportion of C10:0, C18:1, and a significant higher proportion of C18:2n-6, C18:3n-3 and C20:4n-6. Consequently they had a significant lower MUFA content but a higher PUFA content therefore a significant better PUFA/SFA ratio

Quality and consumer acceptance of meat from rabbits fed diets in which soybean oil is replaced with black soldier fly and yellow mealworm fats

This trial investigated the effect of the dietary inclusion of Hermetia illucens (H) and Tenebrio molitor (T) fats as alternative lipid sources for growing rabbits, and assessed the carcass characteristics, proximate composition, lipid peroxidation, and fatty acid profile of the meat, as well as consumer acceptance. At weaning, 200 crossbred rabbits (1051\ub1138 g initial body weight) were allotted to five isolipidic (4% dry matter (DM)) dietary treatments: a control diet (C) containing 1.5% of soybean oil, and four experimental diets in which soybean oil was partially (50%) or totally (100%) substituted by H (H50 and H100) or T (T50 and T100) fats. The carcass characteristics, the meat quality traits, and the consumer acceptance of the cooked meat were not affected. The fat content of Longissimus thoracis et lumborum muscle of the rabbits was 1.1% on average. In the case of rabbit fed the H diets (average of diets H50 and H100), the same muscles revealed a higher saturated fatty acid proportion (47.1% vs. 39.7% and 40.8%, respectively) and a lower polyunsaturated fatty acid proportion than the rabbits fed the C and T diets (average of diets T50 and T100) (26.5% vs. 31.7% and 29.7%) (p<0.001). The meat of the rabbits fed the diets containing insect fat (average for H and T diets) was less susceptible to oxidation (0.24 vs. 0.39 mg malondialdehyde/kg meat in the C group; p<0.01)

FATTY ACID COMPOSITION OF LAMB MEAT FROM ITALIAN AND GERMAN LOCAL BREEDS

The aim of this study was to evaluate and compare the quality characteristics, chemical composition and lipid profile of lamb meat from Italian (Biellese and Sambucana) and German (Texel-Merino-Blackhead-Charollais [TMBC]) breeds reared in extensive and semi-extensive production systems. Meat samples from 89 animals were analysed. The meat of the lambs from semi-intensively reared Biellese, and extensively reared Sambucana and TMBC breeds produced lean meat, with slightly higher intramuscular fat content in TMBC. The latter also produced meat of darker colour (P&lt;0.05) and higher protein content (P&lt;0.05). The meat of Sambucana lambs presented the lowest total cholesterol content (P&lt;0.05). The fatty acid profile of the meat showed a clear advantage of both extensively reared breeds, which had substantially lower proportion of saturated (SFA) but higher of polyunsaturated fatty acids (PUFA), particularly n-3 (P&lt;0.05). The beneficial effect of the extensive rearing conditions was associated with lower n-6/n3 ratio, and atherogenic (AI) and thrombogenic (TI) indices, thereby suggesting that production system can be used successfully to modify the fatty acid profile to achieve a positive effect for the human health