Fatty acid profile, carcass traits and meat quality of Nellore steers following supplementation with various lipid sources

Abstract

The aim of the present study was to evaluate the fatty acid composition of meat and subcutaneous fat, carcass traits and meat quality of Nellore steers fed diets supplemented with various lipid sources. Forty-five young bulls, with average bodyweight of 441 ± 30 kg, were allotted into 10 paddocks, with five treatments, each consisting of two paddocks. The bulls were randomly assigned into one of the following five treatments, which consisted of four lipid sources: palm oil (PO), linseed oil, rumen protected fat (soybean-based oil), whole soybean, and a control (without additional fat). Trial duration was 120 days, which included 30 days of adaptation. Supplements were offered daily at 10 g/kg bodyweight per day. Dietary supplements for providing additional fat were formulated to consist of 10% ether extract. Lipid sources did not significantly affect the average daily gain (P = 0.797) or dressing percentage (P = 0.663). Supplementation with PO increased the concentrations of lauric acid (P = 0.036) and myristic acid (P < 0.001) in the muscle and subcutaneous fat. Animals supplemented with linseed oil had significantly higher concentrations of conjugated linolenic acid in the meat (P = 0.036) and fat (P = 0.049) than did control animals. In the present study, the use of various lipid sources in dietary supplements of grazing cattle during finishing period did not affect carcass traits or physical attributes of beef. This absence of statistical significance may be related to the minimum number of repeat paddocks (2) per treatment. Thus, differences that can have a practical significance were not evidenced by statistical analysis. The inclusion of PO and protected fatty acids derived from soybean oil (rumen-protected fat) is not recommended as a method to improve the lipid profile of meat and subcutaneous fat of Nellore cattle.

Physicochemical Quality, Fatty Acid Composition, and Sensory Analysis of Nellore Steers Meat Fed with Inclusion of Condensed Tannin in the Diet

“…Except for the fat content, dietary treatments did not change meat chemical composition, and the chemical deposition in the meat was almost constant. Animals in different groups deposited a similar amount of protein because of similar levels of dietary protein (Carvalho et al., ; Freitas et al., ). However, feeding condensed tannin changed the fatty acid profile in the tissues, reflecting changes in the ruminal BH.…”

“…There is an increase in the ratio of saturated to unsaturated fatty acids and an increase in the intermediates of the BH, such as vaccenic acid (VA; trans‐ 11 18:1) and conjugated linoleic acid (CLA). Many studies have been focusing on decreasing BH as a way to increase the quality of meat and milk of ruminants by increasing the percentage of beneficial fatty acids in ruminant products (Bessa, Portugal, Mendes, & Santos‐Silva, ; Carvalho et al., ; Correia et al., ; Fiorentini et al., ; Morales & Ungerfeld, ). Dietary factors that affect ruminal BH are the amount and type of dietary fatty acid sources (Martin & Jenkins, ), and supplements or additives that change the ruminal ecosystem.…”

Effect of Whole Cottonseed or Protected Fat Dietary Additives on Carcass Characteristics and Meat Quality of Beef Cattle: A review

“…The fatty acid profile of cattle fed with on cottonseed may have been subject to extensive biohydrogenation as is suggested by the higher levels of stearic acid found in the samples taken from animals fed on a high fat diet. The dietary inclusion of PLs derived from soybean oil (rumen-protected fat) is not recommended as a method to for improving the lipid profile of subcutaneous fat meat and meat subcutaneous fat of derived from Nellore cattle (Putrino, 2006;Carvalho et al, 2016).…”

Teor e composição de lipídeos como ferramenta de gestão na nutrição de bovinos

“…Esta opção tem sido bastante utilizada na suplementação de animais ruminantes com o objetivo de melhorar a qualidade da carne e o desempenho animal (Palmquist & Mattos, 2011). Carvalho et al (2017) ao avaliarem a composição de ácidos graxos da carne e gordura subcutânea em novilhos Nelore suplementados com diferentes fontes lipídicas (óleo de palma (PO), óleo de linhaça, gordura protegida no rúmen (óleo de soja), soja integral e controle), observaram que a suplementação com PO aumentou as concentrações de ácido láurico e ácido mirístico no músculo e gordura subcutânea. Os animais suplementados com óleo de linhaça apresentaram concentrações significativamente maiores de ácido linolênico conjugado (CLA) na carne e gordura do que os animais controle.…”