Browsing by Author "Buarque, Vicente Luiz Macedo"

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    Effect of Different Selection Criteria on Performance, Carcass and Meat Quality of Nellore Young Bulls
    Silva, Juliana; Cônsolo, Nara Regina Brandão; Buarque, Vicente Luiz Macedo; Beline, Mariane; da Silva Martins, Taiane; Lobo, Annelise Aila Gomes; Gómez, Juan Fernando Morales; Eler, Joanir Pereira; Leme, Paulo Roberto; Netto, Arlindo Saran; Gerrard, David E.; Baldi, Fernando; Silva, Saulo Luz (MDPI, 2021-03-29)
    This study was carried out to evaluate the effects of selection criteria for post-weaning daily gain (PWDG) and early sexual heifer precocity (PP14) on the performance, carcass traits and meat quality of Nellore bulls. In year one, 50 animals were selected according to their expected progeny differences (EPDs) for PWDG and grouped as high (HG) or low (LG) groups. In year two, 50 animals were selected according to EPD for PP14 and also grouped as high (HP) or low (LP). After slaughter, samples of the longissimus muscle area (LMA) were used to evaluate meat quality. Most of performance traits were not affected by the selection criteria. However, the HG group had higher dressing percentage (p = 0.028), LMA (p = 0.02) and fat trim in the forequarter (p = 0.04) compared to the LG group. The HP group tended to have greater dry matter intake (p = 0.08), LMA (p = 0.05), rump fat (p = 0.04), heavier striploins (p = 0.07), tenderloins (p = 0.09) and briskets (p = 0.08) compared with LP group. In conclusion, the selection based on divergent groups PWDG or PP14 has a small impact on performance, carcass and meat quality traits.
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    Selection for Growth and Precocity Alters Muscle Metabolism in Nellore Cattle
    Cônsolo, Nara Regina Brandão; da Silva, Juliana; Buarque, Vicente Luiz Macedo; Higuera-Padilla, Angel; Barbosa, Luis Carlos Garibaldi Simon; Zawadzki, Andressa; Colnago, Luis Alberto; Netto, Arlindo Saran; Gerrard, David E.; Silva, Saulo Luz (MDPI, 2020-02-06)
    To clarify the relationship between beef genetic selection for growth and precocity with muscle metabolism and metabolites, we performed metabolomic analysis using Longissimus lumborum (LL) muscle from Nellore cattle with divergent selection for these traits (high growth, HG; low growth, LG; high precocity, HP; low precocity, LP). Genetic potential for growth affected muscle protein and energetic metabolism. HG animals had a high concentration of arginine, carnosine, and leucine compared to LG animals. HP animals presented a high concentration of glutamine, betaine, creatinine, isoleucine, carnitine, acetyl carnitine, and lower levels of glucose compared to LP animals, affecting protein and fatty acid metabolism. Intensity of selection (high or low) was correlated with changes in protein metabolism, and the type of selection (growth or precocity) affected fat metabolism. In conclusion, both HG and HP appear to be correlated with a high concentration of protein metabolites and changes in protein metabolic pathways, while selection for precocity is more correlated with changes in fat metabolism compared to animals selected for growth.