Qualidade nutricional da carne de tourinhos nelore e ½ angus-nelore terminados em confinamento ou em pastagem com suplementação
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2017-03-06
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Universidade Federal de Goiás
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It was aimed to verify the influence of genetics between Nelore or ½ Angus-Nelore animals and the finishing phase systems, pasture with protein-energy supplementation or feedlot, on the contents of moisture, ashes, proteins, fat, iron, zinc, calcium, potassium, pH, color, fatty acids composition, vitamin E, lipid oxidation and cholesterol of the meat of these animals, after reaching 480 kg body weight. It was adopted the completely randomized design, in 2x2 factorial arrangement, with two breeds and two finishing systems. Meat from feedlot finished ½ Angus-Nelore animals obtained higher protein content (P <0.05) than feedlot Nelore animals. The ½ Angus-Nelore animals finished on pasture with supplementation obtained meat with higher content (P <0.05) of zinc and lower content of linoleic acid (C18:2 n-6) compared to meat of Nelore steers finished on pasture with supplementation and feedlot finished ½ Angus-Nelore. For myristic acid, one of the fatty acids considered to be hypocholesterolemic, the treatment with meat of feedlot finished Nelore showed a higher value (P <0.05) when compared to Nelore finished on pasture with supplementation and feedlot finished ½ Angus-Nelore. Meat of Nelore steers finished on pasture with supplementation obtained higher values (P<0.05) for stearic (C18:0), linolenic (C18:3n-3), DHA and total polyunsaturated fatty acids when compared to feedlot finished Nelore. Isolatedly, (P <0.05), the feedlot system generated higher contents of C18:1 trans-10 cis-12 fat. The pasture combined with supplementation system contributed to higher values of calcium, potassium, trans-vaccenic acid (C18:1 trans-11 cis-9) and vitamin E. For the Nelore breed, they were found higher contents of fat and vitamin E, while the ½ Angus-Nelore showed higher amount of potassium. The analysis of moisture, ash, iron, pH, color, cholesterol, palmitic acid (C16:0), total saturated fatty acids and oleic acid (C18:1n-9) were not significant. According to the obtained results, it was concluded that, under the conditions of the present study, Nelore animals finished on pasture with supplementation resulted in meat with a higher content of polyunsaturated, mainly omega-3, fatty acids, when compared to feedlot finished Nelore, while the ½-Angus-Nelore finished on pasteure with supplementation, lower omega-6 content, whose characteristic is very important with regard to n-6 / n-3 ratio; and the pasture finishing system contributed, isolatedly, to higher contents of calcium, potassium, vitamin E and trans-vaccenic acid, which is an intermediate of the ruminal biohydrogenation process, shown to be beneficial to health, while the feedlot system contributed to an increased deposition of intramuscular fat and higher content of the trans isomer, which is harmful to health.
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REIS, R. C. Qualidade nutricional da carne de tourinhos nelore e ½ angus-nelore terminados em confinamento ou em pastagem com suplementação. 2017. 96 f. Tese (Doutorado em Ciência Animal) - Universidade Federal de Goiás, Goiânia, 2017.