A study was conducted to determine the effects of graded levels of extruded flaxseed (EF) on laying hen performance, apparent total tract nutrient retention (ATTNR) and fatty acid concentrations of egg yolk, blood plasma and liver. Seventy‐two White Leghorn layers (58 weeks old; three per cage) were randomly assigned to one of four dietary treatments: 0 (control), 3, 6 and 9% of EF‐supplemented diets for 8 weeks. Results showed that feed intake, egg production, feed conversion ratio and egg weight were not affected by treatments. The ATTNR of dry matter (p = .001) and gross energy (p = .014) was lower for layers fed 9% EF than those fed the control diet, while ATTNR of organic matter (p = .001) and nitrogen‐corrected apparent metabolizable energy (p = .003) were lower for birds fed 6% and 9% EF compared with those fed the control diet. Relative to the control diet, feeding EF increased (p < .001) egg yolk, plasma and liver n‐3 polyunsaturated fatty acid (PUFA) concentrations. Birds fed 6% EF produced eggs > 300 mg of n‐3 PUFA after two weeks of feeding, while the highest of n‐3 PUFA concentrations were achieved for birds fed 9% EF. It was concluded that feeding EF up to 9% of the diet had no adverse effects on layer performance and increased n‐3 PUFA concentrations in blood plasma, liver and egg yolk. However, moderate to high levels of EF (i.e., 6% and 9% of the diet) reduced nutrient ATTNR and nitrogen‐corrected apparent metabolizable energy. Omega‐3‐enriched eggs can be achieved by feeding layers EF at 6% of the diet.

中文翻译：

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饲喂膨化亚麻籽对蛋鸡生产性能，总养分消化率以及蛋黄，血浆和肝脏脂肪酸含量的影响。

进行了一项研究，以确定亚麻籽膨化水平（EF）对蛋鸡生产性能，表观总道养分含量（ATTNR）和蛋黄，血浆和肝脏脂肪酸浓度的影响。将72层白色来亨鸡层（58周龄；每笼三层）随机分配至以下四种饮食治疗之一：0（对照），3、6％和9％的EF补充饮食，共8周。结果表明，采食量，产蛋量，饲料转化率和蛋重不受处理的影响。 饲喂9％EF的蛋鸡的干物质的ATTNR（p  = .001）和总能量（p = .014）低于对照日粮，而有机物的ATTNR（p  = .001）和氮校正后表观代谢能（p  = 0.003）饲喂EF和EF分别为6％和9％的家禽比对照组饲喂的家禽低 相对于对照饮食，进食EF增加（p  <.001）蛋黄，血浆和肝脏n-3多不饱和脂肪酸（PUFA）浓度。饲喂两周EF的鸟在喂食两周后产卵> 300 mg n-3 PUFA，而饲喂9％EF的鸟n-3 PUFA浓度最高。结论是，在不超过9％的饮食中饲喂EF对蛋鸡的产蛋性能没有不利影响，并且血浆，肝脏和蛋黄中n-3 PUFA浓度增加。但是，中度至高水平的EF（即饮食的6％和9％）会降低营养素ATTNR和氮校正的表观代谢能。可以通过添加6％的日粮EF来获得富含Omega-3的鸡蛋。