Jiang Y H, McGeachin R B, Bailey C A
Department of Poultry Science, Texas A&M University System, College Station 77843-2472.
Poult Sci. 1994 Jul;73(7):1137-43. doi: 10.3382/ps.0731137.
Due to the numerous health benefits associated with consumption of antioxidants such as alpha-tocopherol and beta-carotene, an experiment was conducted to determine dietary levels that would significantly enhance their concentration in chicken egg yolks. In the experiment, 127 Single Comb White Leghorn laying hens were divided into treatment groups (n = 40 per treatment group) and fed diets containing 0, 50, 100, 200, or 400 mg/kg beta-carotene, dl-alpha-tocopheryl acetate, or their combination. Yolk alpha-tocopherol increased (P < .05) from the control level of 144 micrograms/g of yolk to 477 micrograms/g of yolk when 400 mg dl-alpha-tocopheryl acetate/kg of diet was supplemented. Yolk retinol levels increased (P < .05) from 11.6 micrograms/g of yolk in controls to 13.9 micrograms/g of yolk at 200 mg beta-carotene/kg of diet. beta-Carotene content in the yolk also increased (P < .05) from .14 micrograms/g of yolk in controls to 5.19 micrograms/g of yolk at 200 mg beta-carotene/kg of diet. Supplemental beta-carotene markedly decreased the yolk deposition of alpha-tocopherol when the two compounds were fed together. Egg production, egg weight, and egg yield were not affected by dietary supplementations. Although the data indicated that it is possible to significantly increase the concentration of all three compounds in chicken eggs, because of the relative expense involved it may not be commercially viable to increase egg yolk concentrations of beta-carotene or retinol by supplementing beta-carotene in the diet.
由于食用α-生育酚和β-胡萝卜素等抗氧化剂对健康有诸多益处，因此进行了一项实验，以确定能显著提高其在鸡蛋蛋黄中浓度的日粮水平。在该实验中，127只单冠白来航母鸡被分为处理组（每组n = 40），并分别饲喂含有0、50、100、200或400 mg/kgβ-胡萝卜素、dl-α-生育酚乙酸酯或它们组合的日粮。当在日粮中添加400 mg dl-α-生育酚乙酸酯/kg时，蛋黄α-生育酚含量从对照水平的144微克/克蛋黄增加到477微克/克蛋黄（P < .05）。蛋黄视黄醇水平从对照组的11.6微克/克蛋黄增加到日粮中添加200 mgβ-胡萝卜素/kg时的13.9微克/克蛋黄（P < .05）。蛋黄中的β-胡萝卜素含量也从对照组的0.14微克/克蛋黄增加到日粮中添加200 mgβ-胡萝卜素/kg时的5.19微克/克蛋黄（P < .05）。当同时饲喂这两种化合物时，补充β-胡萝卜素会显著降低α-生育酚在蛋黄中的沉积。产蛋量、蛋重和产蛋率不受日粮添加物的影响。虽然数据表明有可能显著提高鸡蛋中所有这三种化合物的浓度，但由于涉及的相对成本，通过在日粮中补充β-胡萝卜素来提高蛋黄中β-胡萝卜素或视黄醇的浓度在商业上可能不可行。
