Lipid and selenium sources on fatty acid composition of intramuscular fat and muscle selenium concentration of Nellore steers

Abstract

-The objective of this study was to evaluate the effect of lipid and selenium sources in diets for finishing Nellore steers on the fatty acid composition and selenium concentration of the longissimus muscle. Fifty Nellore steers (body weight = 458±39 kg) were assigned to one of six dietary treatments: 1) diet containing sunflower seed and inorganic selenium; 2) sunflower seed and organic selenium; 3) whole cottonseed and inorganic selenium; 4) whole cottonseed and organic selenium; 5) soybeans and inorganic selenium; and 6) soybeans and organic selenium. Diets were formulated with the same amount of nitrogen and calories and supplied once daily to steers in collective pens, with three animals per pen, for 120 d. At the end of the trial, steers were slaughtered and samples of the longissimus muscle were collected for fatty acid and selenium analysis. Effect of selenium sources was detected for selenium concentration in the longissimus muscle. Organic selenium had higher concentrations in the meat compared with inorganic selenium. The total saturated, monounsaturated and polyunsaturated fatty acids did not differ between the sources of lipids and selenium. For selenium sources, no differences were observed between the concentrations of polyunsaturated fat. Also, no differences in C18:2 cis-9 trans-11 concentrations were noted; however, steers fed sunflower seed presented greater proportions of this fatty acid in the meat. The results indicated that the use of sunflower seed, cottonseed or soybeans and organic or inorganic selenium in feedlot diets to Nellore cattle does not alter the great part of the fatty acid profile of the longissimus muscle. However, the inclusion of sunflower seed in the diet increases the meat CLA cis-9, trans-11, which is desirable and beneficial for the health of consumers.

Selenium in Cattle: A Review

“…These two organic forms of selenium are the most common ones in forages. They are well absorbed by the body and accumulate in animal tissues [24]. Stems, leaves and seeds of plants are rich in selenium than the roots.…”

“…During selenium supplementation in cattle, the sum of saturated fatty acids, monounsaturated and polyunsaturated for meat was not influenced by the source of selenium (sodium selenite or selenized yeasts) [24]. Netto et al [113] report similar results except for linoleic and palmitic acid.…”

Metabolic switch during adipogenesis: From branched chain amino acid catabolism to lipid synthesis

“…5D), which were previously described as not synthesised by mammals, as well as biomarkers of dairy product consumption [51]. Because we used the cell growth medium supplemented with 10% fetal bovine serum and the ruminant animals contain approximately 5 % of odd chain fatty acids in their tissue [52], the increased odd chain fatty acid content in cells may have arisen from the culture medium. Consequently, free odd chain fatty acid concentrations in the conditioned medium were investigated.…”

Form of Supplemental Selenium in Vitamin-Mineral Premixes Differentially Affects Early Luteal and Gestational Concentrations of Progesterone, and Postpartum Concentrations of Prolactin in Beef Cows

“…Conventionally, free-choice vitamin-mineral mixes containing Se have been formulated with an inorganic form of Se, sodium selenate or sodium selenite. However, the available forms of Se that naturally occur in forages are the organic forms, selenomethionine and selenocysteine [11]. The form of Se available to an animal affects the bioavailability of Se in blood and tissues, and the bioactivity of Se by affecting blood glutathione peroxidases [12][13][14].…”