Implementing insects, such as the black soldier fly larvae (BSFL), as animal feed commonly includes the previous removal of substantial amounts of fat. This fat may represent an as yet underutilized energy source for livestock. However, transfer of lauric and myristic acid, prevalent in BSFL fat and undesired in human nutrition, into animal-source foods like eggs may limit its implementation. To quantify this, a laying hen experiment was performed comprising five different diets (10 hens/diet). These were a control diet with soybean oil and meal and a second diet with soybean oil but with partially defatted BSFL meal as protein source. The other three diets were based on different combinations of partially defatted BSFL meal and fat obtained by two different production methods. Lauric acid made up half of the BSFL fat from both origins. Both BSFL fats also contained substantial amounts of myristic and palmitic acid. However, in the insect-based diets, the net transfer from diet to egg yolk was less than 1% for lauric acid, whereas the net transfer for myristic and palmitic acid was about 30% and 100%, respectively. The net transfer did not vary between BSFL originating from production on different larval feeding substrates. The results illustrate that hens are able to metabolize or elongate very large proportions of ingested lauric acid and myristic acid, which are predominant in the BSFL lipids (together accounting for as much as 37 mol%), such that they collectively account for less than 3.5 mol% of egg yolk fatty acids.

中文翻译：

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黑色士兵蝇幼虫脂质向母鸡蛋黄脂质转移的月桂酸和肉豆蔻酸含量低

使用昆虫，例如黑水虻幼虫 (BSFL)，作为动物饲料通常包括预先去除大量脂肪。这种脂肪可能代表了一种尚未充分利用的牲畜能源。然而，将 BSFL 脂肪中普遍存在且在人类营养中不受欢迎的月桂酸和肉豆蔻酸转移到鸡蛋等动物源食品中可能会限制其实施。为了量化这一点，进行了包含五种不同饮食（10 只母鸡/饮食）的蛋鸡实验。这些是含有豆油和豆粕的对照日粮，以及含有豆油但部分脱脂的 BSFL 豆粕作为蛋白质来源的第二日粮。其他三种饮食基于部分脱脂 BSFL 膳食和通过两种不同生产方法获得的脂肪的不同组合。月桂酸占两个来源的 BSFL 脂肪的一半。两种 BSFL 脂肪还含有大量的肉豆蔻酸和棕榈酸。然而，在以昆虫为基础的饮食中，月桂酸从饮食到蛋黄的净转移低于 1%，而肉豆蔻酸和棕榈酸的净转移分别约为 30% 和 100%。源自不同幼虫饲养基质生产的 BSFL 之间的净转移没有变化。结果表明，母鸡能够代谢或延长摄入的月桂酸和肉豆蔻酸的很大比例，它们在 BSFL 脂质中占主导地位（合计占 37 mol%），因此它们总共占不到 3.5 mol%的蛋黄脂肪酸。月桂酸从饮食到蛋黄的净转移低于 1%，而肉豆蔻酸和棕榈酸的净转移分别约为 30% 和 100%。源自不同幼虫饲养基质生产的 BSFL 之间的净转移没有变化。结果表明，母鸡能够代谢或延长摄入的月桂酸和肉豆蔻酸的很大比例，它们在 BSFL 脂质中占主导地位（合计占 37 mol%），因此它们总共占不到 3.5 mol%的蛋黄脂肪酸。