The influence of dietary soyabean and linseed on the chemical composition and fatty acid profile of the <i>Longissimus</i> muscle of feedlot-finished bulls

Abstract

This work was carried out to evaluate the effect of soya and linseed on the chemical composition and fatty acid profi le of the Longissimus muscle of crossbred bulls fi nished in feedlot. Twenty-one crossbred bulls (1/2 Nelore vs 1/2 Simmenthal), at an average age of 18 months were used in a completely randomized design, with three treatments and seven repetitions. The dietary treatments were: control (CON), linseed and soyabean (SOYA), and soyabean and linseed added after the 60 th day of the experiment (LIN). No difference (P>0.05) was observed among the treatments on the chemical composition of the Longissimus muscle. The values of conjugated linoleic acid (18:2-c-9, t-11) were higher (P<0.05) in the LIN (0.39%) and SOYA (0.46%) treatment, as compared with the CON treatment (0.26%). n-3 PUFA values were higher (P<0.05) in the LIN treatment (1.58%) as compared with the CON treatment (0.83%).

Sodium monensin or propolis extract in the diet of crossbred (½ Red Angus vs. ½ Nellore) bulls finished in feedlot: chemical composition and fatty acid profile of the Longissimus muscle

“…As the adipose tissue increases, the deposition of C18:1 content also increases and C18:2 is reduced. The effects of nutrition on meat quality are more significant in terms of carcass characteristics and chemical composition (ABRAHÃO et al, 2005;PRADO et al, 2008a;ROTTA et al, 2009b). On the other hand, the effects of nutrition on fatty profile are generally small but significant; they are often very important in terms of nutritive value, color of the product and quality or fat consistency (WEBB; O'NEIL, 2008).…”

Growth performance, carcass characteristics and meat quality of finishing bulls fed crude glycerin-supplemented diets

“…Because of the rising corn costs, alternative feed sources have become a major focus for the livestock industry Prado et al 2003;Abrahão et al 2005;2006;Prado et al 2008b). In Brazil, the biodiesel industry has emerged; its production helps to conserve the environment by reducing global warming gases and also contributes to social development through the generation of jobs (Oliveira et al 2006).…”

Carcass characteristics, chemical composition and fatty acid profile of longissimus muscle of young bulls from four genetic groups finished in feedlot

“…Some foods with low amounts of these fatty acids are required. However, in the longissimus muscle, the percentage of C14:0 and C16:0 is considered high (35% of the total acids) (Prado et al, 2008b;Prado et al, 2009b;Rotta et al, 2009b). The fatty acid C18:0 (stearic acid) percentage was similar (P>0.05) for the different genetic groups.…”

“…However, there was no difference (P>0.05) for Caracu, Aberdeen Angus × Canchin and Charolais × Caracu genetic groups. The n-6 percentage ranges from 3.5 to 9.3 (Rotta et al, 2009a).The genetic groups that have the zebu genes in their composition show high percentages of this category of fatty acids (Prado et al, 2008b;c). This can be because of genetic groups that have more polyunsaturated fatty acids in their fatty acid profile.…”

“…However, this value is near the recommended by the England Department of Health (1994), which is 4:1. Prado et al (2003) evaluated the fatty acid profile in Bos taurus indicus and Bos taurus indicus × Bos taurus taurus crossbred finished on pasture and observed that animals from forage diets show lower values for n-6/n-3 ratio (1.27) in relation to animals finished in feedlot, which present higher n-6/n-3 ratio (8.30) (Prado et al, 2008b). …”