Effect of dietary folic acid supplementation on egg folate content and the performance and folate status of two strains of laying hens
Effect of dietary folic acid supplementation on egg folate content and the performance and folate status of two strains of laying hens
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DOI：
10.1093/ps/84.10.1533
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发表时间：
2005-10-01
期刊：
影响因子：
4.4
通讯作者：
Guenter, W
中科院分区：
文献类型：
--
作者：
Hebert, K;House, JD;Guenter, W
当膳食叶酸水平增加时，鸡蛋中的叶酸含量就可能增加。然而，制定生产富含叶酸的鸡蛋的最佳策略需要了解因禽类品种而产生的差异，并更好地了解限制鸡蛋叶酸沉积的因素。为此，设计了一项研究来确定生产性能不同的两种来亨鸡菌株的反应。 Hyline W36 和 W98 母鸡（每种日粮 n = 6 只）连续 21 天接受含有 0、2、4、8、16、32、64 或 128 mg/kg 结晶叶酸的大麦日粮。反应标准包括生产参数、血液叶酸状态测量和鸡蛋叶酸含量。观察到补充叶酸对鸡蛋叶酸含量和血浆叶酸的显着（P < 0.05）主要影响，随着补充，鸡蛋叶酸含量和血浆叶酸增加，同型半胱氨酸浓度降低；然而，性能并未受到影响。与 W36 相比，Hyline W98 品系的鸡蛋和蛋黄总重量以及饲料消耗显着更高（P < 0.05）。在鸡蛋和蛋黄重量、鸡蛋叶酸含量和血浆同型半胱氨酸方面观察到显着的（P < 0.05）比率x菌株相互作用。产蛋量较高的菌株 Hyline W98 通过降低血浆同型半胱氨酸浓度而受益于叶酸的增加，这表明该菌株比 W36 菌株对叶酸的需求更高。总体而言，当饮食中添加 2 毫克/公斤或更高的结晶叶酸时，鸡蛋叶酸含量会最大化。由于鸡蛋叶酸沉积的前体池饱和，因此无法获得较高水平的鸡蛋叶酸。
Enrichment of eggs with folate is possible when dietary folic acid levels are increased. However, development of optimal strategies for the production of folate-enriched eggs requires knowledge as to differences due to strain of bird and a greater understanding of the factors limiting egg folate deposition. To this end, a study was designed to determine the response of two leghorn strains that differ in production performance. Hyline W36 and W98 hens (n = 6 per diet) received a barley-based ration containing 0, 2, 4, 8, 16, 32, 64, or 128 mg/kg of crystalline folic acid for 21 d. Response criteria included production parameters, measures of blood folate status, and egg folate content. Significant (P < 0.05) main effects of folate supplementation were observed for egg folate content and plasma folate, which increased, and homocysteine concentrations, which decreased with supplementation; performance, however, was not affected. The Hyline W98 strain had significantly (P < 0.05) higher total egg and yolk weights and feed consumption when compared with the W36. Significant (P < 0.05) ration x strain interactions were observed for egg and yolk weight, egg folate content, and plasma homocysteine. The higher egg mass producing strain, Hyline W98, benefited from increased folic acid through a reduction in plasma homocysteine concentrations, suggesting that this strain has a higher requirement for folate than the W36 strain. Overall, egg folate content is maximized when crystalline folic acid is supplemented to the diet at 2 mg/kg or higher. Higher levels of egg folate are not achieved due to the saturation of the precursor pool for egg folate deposition.