Influence of dietary fat sources and conjugated fatty acid on egg quality, yolk cholesterol, and yolk fatty acid composition of laying hens

Abstract

This study was conducted to investigate the effects of dietary fats (tallow [TO] or linseed oil [LO]) or conjugated linoleic acid (CLA), singly or in combination, on laying performance, yolk lipids, and fatty acid composition of egg yolks. Three hundred 50-week-old laying hens were given one of five diets containing 2% TO; 1% TO + 1% CLA (TO/CLA); 2% LO; 1% LO + 1% CLA (LO/CLA); and 2% CLA (CLA). Laying performance, egg lipids, and serum parameters were not altered by dietary treatments. Alpha-linolenic acid or long-chain ω-3 fatty acids including eicosapentaenoic and docosahexaenoic acids were elevated in eggs of laying hens fed diets containing LO (i.e., LO or LO/CLA groups) compared with those of hens fed TO-added diets. Dietary CLA, alone or when mixed with different fat sources (i.e., TO or LO), increased the amounts of CLA in egg yolks, being the highest in the CLA-treated group. The supplementation of an equal portion of CLA and LO into the diet of laying hens (i.e., LO/CLA group) increase both CLA and ω-3 fatty acid contents in the chicken eggs.

Black soldier fly larvae oil as an alternative fat source in broiler nutrition

“…Different fat sources did not affect the indicators of liver functions (i.e., GPT and GOT) ( Manterys et al., 2016 , Keum et al., 2018 ), which indicates that BSFL oil did not induce toxic or adverse effect on liver functions. As to serum cholesterol, perplexed results were emerged from this study.…”

Effect of Dietary Supplementation of Full-Fat Canola Seeds on Productive Performance, Blood Metabolites and Antioxidant Status of Laying Japanese Quails

“…Besides, CS contain high percentage of unsaturated fatty acids 93.44%, mainly 61.69% oleic acid, 22.12% linoleic and 6.32% linolenic acid (Farrag, 2019), these essential fatty acids of canola oil are involved in its utilization mode, taste and suitable odor, lead to increasing hen feed consumption (g/ hen/day), which in turn correlate with the significant increase in hen-day egg production (%), egg mass (g egg/hen/day) and improving the final body weight of supplemented groups. Moreover, feeding birds on diets containing unsaturated fatty acids has improved their lipid metabolism and productive performance (Keum et al, 2018). In accordance with obtaining results, (Przybylski et al, 2013;Sharafi et al, 2015) reported 7% saturated acids, including palmitic and stearic acid, and high levels of unsaturated fatty acids 93%, including 61% oleic acid, 11% linolenic acid, and 21% linoleic acid in CS, this unique composition may provide the laying quail with essential fatty acids, energy and bioactive materials during the bird's life production resulted in a positive impact on egg production and egg weight ( Sharafi et al, 2015;Ibrahim et al, 2018).…”

Effects of dietary Jerusalem artichoke (Helianthus tuberosus) tuber powder and medium/long-chain fatty acids on production performance and fatty acid profile in laying hens

“…The FAs composition of the MLCFAs was: 0.50% caproic acid (C6:0), 4% caprylic acid (C8:0), 4% capric acid (C10:0), 44% lauric acid (C12:0), 20% myristic acid (C14:0), 10% palmitic acid (C16:0), 0.25% palmitoleic acid (C16:1), 4% stearic acid (C18:0), 10% oleic acid (C18:1), 3% linoleic acid (C18:2) and 0.25% linolenic acid (C18:3). FAs were analysed as described by Keum et al (2018).…”