Composição química e perfil de ácidos graxos da carne de bovinos de diferentes condições sexuais recebendo silagem de milho e concentrado ou cana-de-açúcar e concentrado contendo grãos de girassol

Abstract

RESUMO -O objetivo neste trabalho foi avaliar as características químicas e a composição em ácidos graxos do contrafilé (músculo Longissimus) de tourinhos, novilhos e novilhas da raça Canchim. Os animais foram terminados em confinamento com duas dietas experimentais, uma com silagem de milho e concentrado e outra com cana-de-açúcar e concentrado contendo grãos de girassol. Os teores de umidade, proteína e minerais no músculo não diferiram entre as dietas e as condições sexuais dos animais. A carne de novilhos terminados com a dieta com grãos de girassol apresentou maior teor de lipídios (3,31%) em comparação à dos animais de outras categorias. Os animais que receberam a dieta com grãos de girassol apresentaram maiores concentrações de ácido linoléico conjugado (18:2 cis9, trans-11) (0,73%) e ácidos graxos poliinsaturados (8,12%) no músculo, e também relações mais elevadas de ácidos graxos insaturados:saturados (0,93) e ácidos graxos poliinsaturados:saturados (0,16) em comparação àqueles que receberam a dieta convencional, à base de silagem de milho (0,34%; 6,31%; 0,86; e 0,11, respectivamente). A composição em ácidos graxos da carne de bovinos pode ser melhorada com a utilização de cana-de-açúcar e grãos de girassol na dieta dos animais terminados em confinamento.Palavras-chave: ácidos graxos insaturados, ácidos graxos saturados, ácido linoléico conjugado Chemical traits and fatty acids composition of beef from young bulls, steers and heifers fed corn silage and concentrate or sugarcane and concentrate with sunflower grains ABSTRACT -The objective in this work was to evaluate the chemical characteristics and the fatty acids composition of beef loin (Longissimus muscle) of young bulls, steers and heifers of Canchim breed. The animals were finished in feedlot system and fed two experimental diets, one with corn silage and concentrate (SIL) and the other with sugar cane, as exclusive roughage, and concentrate containing sunflower grains (CNA). Differences were not detected in relation to moisture, protein and mineral contents between diets or sexual categories. The meat from steers that received the CNA diet had higher lipid content (3.31%) in relation to meat from young bulls and heifers receiving the same diet. The meat from animals that received the CNA diet had higher concentrations of conjugated linoleic acid (18:2 cis-9, trans-11) and polyunsaturated fatty acids, and showed higher unsaturated fatty acids:saturated fatty acids and polyunsaturated fatty acids:saturated fatty acids ratios than those of animals fed with SIL diet; respectively 0.73 and 0.34%; 8.12 and 6.31%; 0.93 and 0.86; 0.16 and 0.11. The fatty acids composition in meat from beef cattle can be improved with the utilization of sugar cane and sunflower grains in the finishing diet.Key Words: conjugated linoleic acid, saturated fatty acids, unsaturated fatty acids IntroduçãoAtualmente, a pesquisa tem evoluído em investigações para melhorar a qualidade da carne bovina, conquistar o consumidor e ampliar a competição com as carnes de aves e suínos. A...

Intake, performance and estimated methane production of Nellore steers fed soybean grain

“…Fernandes et al (2009) observed a lightness of 31.31 in the meat from confined Nellore steers, which is similar to values obtained in the present research. They also stated that the lightness and colouration of the meat are directly related to the pH value after cooling.…”

“…As described by Abularach et al (1998), pH values between 5.40 and 5.60 are normal for beef; thus, the pH of rib loins derived from different treatments were acceptable and contributed to the intensity of a* and b*. According to Fernandes et al (2009), meat may appear dark at a pH greater than 6.00, due to an increase in enzymatic activity and water retention and a decrease in oxygen penetration. A pH of 6.00 is considered the border between normal cuts and dark cuts.…”

Production performance of lactating dairy cows at pasture fed concentrate supplemented with licuri oil

“…However, the response in milk production of dairy cows to supplemental fat sources is highly variable, from -4.4 to 9.6 kg/day of milk/kg of lipid added to the diet (Abughazaleh, 2008). This considerable variation in the response to supplementation has been attributed to the physiological states of the cows, the type of roughage basal diet, the total amount of energy consumed by the animal under the supplementation and the amount and composition of the lipid source used (Fernandes et al 2009).…”

Relative Contribution of Breed, Gender and Diet to the Fatty Acid Profile of Young Crossbred Beef Cattle Finished on Feedlot

“…Therefore, factors not included in the model may have larger influence on SFA and CLA. Similarly, other studies from Brazil (Fernandes et al 2009) reported no gender effects on SFA and CLA content of intramuscular fat in cattle fed different diets.…”