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Percorrer por autor "Antunes, I.C."

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  • Immunocastration as an alternative to caponization: evaluation of its effect on body and bone development and on meat color and composition
    Publication . Quaresma, M.A.G.; Antunes, I.C.; Ribeiro, Maria; Prazeres, S; Bessa, R.J.B.; Martins da Costa, Paulo
    Caponization is associated with some morbidity and mortality, which contributes to important economic losses. This practice is executed without any pain relief (neither anesthesia nor analgesia) and can be painful and without consideration of animal welfare. On the other hand, immunocastration accomplished by Improvac and Bovipriva in pigs and cattle represents a noninvasive procedure, and for that reason is regarded as an alternative with improved animal welfare. This study includes 4 experimental groups consisting of capons, slips, roosters, and birds submitted to the Improvac treatment. The administration of Improvac was associated with a considerable reduction in serum testosterone concentration (reduced by 79% compared to average serum testosterone of roosters). Regarding significant differences among experimental groups, birds from the Improvac group were intermediate between capons and slips with respect to abdominal fat pad weight and yield, breast meat water and protein contents, and femur length. Conversely, color parameters such as lightness, redness, and hue angle for Improvac birds were intermediate between roosters and capons. Thus, immunocastration with Improvac could represent an alternative solution to caponization, with considerable improvements in animal welfare.
    2017Artigo científico Acesso aberto Ver mais
  • Nutritional composition of commercially sourced meat from two anatomical locations under regenerative and intensive production systems
    Publication . Antunes, I.C.; Roseiro, L.C.; Gonçalves, H.; Gonçalves, E.; Soares, A.; Alegria, C.; Alvarenga, N.; Reis, J.; Oliveira, Margarida; Dias, Igor
    Regenerative agriculture approaches in livestock production may help produce animal protein that aligns with increasingly demanding sustainability criteria. This study compared commercially sourced beef from regenerative farming systems (RFS; n = 10; Longissimus lumborum, n = 5; Splenius capitis, n = 5) and intensive systems (IS; n = 6; Longissimus lumborum, n = 3; Splenius capitis, n = 3), evaluating the effects of production system (PS), muscle type (MT), and their interaction (MT × PS) on nutritional traits. IS chuck had higher polyunsaturated fatty acids (PUFA) and n-6 PUFA family (n-6 PUFA) contents (p < 0.05; 10.24 and 9.15 g fatty acids (FA)/100 g total FA, respectively), driven by C18:2 cis-9, trans-11, C20:4 n-6, and C18:2 n-6 contents. Consequently, IS chuck had a higher polyunsaturated FA and saturated FA ratio (P/S), peroxidability index (PI), n-6 PUFA family and n-3 PUFA family ratio (n-6/n-3), and hypocholesterolemic/hypercholesterolemic ratio (h/H) values (p < 0.05; 0.13, 23.87, 9.33 and 0.32, respectively). By comparison, RFS chuck had the highest n-3 PUFA content (p < 0.05; 1.28 g FA/100 g total FA), primarily due to its higher C18:3 n-3 content, resulting in a lower n-6/n-3 ratio (3.95). RFS meat showed higher vitamin E and α-tocopherol (0.58 and 0.56 mg/100 g of meat, respectively), exceeding the ≥0.30 mg/100 g threshold proposed to limit lipid oxidation, unlike IS meat.
    2026-03-07Artigo de investigação Acesso aberto Ver mais