ABSTRACT

1. The impact of feeding sources of n-3 fatty acids (FA) to ISA Brown and Shaver White breeders and their offspring on antibody titres and plasma FA profile was examined.

2. Breeders were fed either a control diet (CON); CON + 1% microalgae (DMA: Aurantiochytrium limacinum) as a source of docosahexaenoic acid; or CON + 2.6% of a co-extruded mixture of full-fat flaxseed (FFF) as a source of α-linolenic acid. Day-old female offspring were assigned to diets (breeder-offspring): 1) CON-CON, 2) CON-DMA, 3) CON – FFF, 4) DMA – CON, 5) DMA – DMA, 6) FFF – CON or 7) FFF – FFF, followed by a standard layer diet through 18 weeks of age (WOA) to 42 WOA.

3. Antibody titres against infectious bronchitis (IBV) and Newcastle disease (NDV) were measured at six days and six WOA, and plasma FA profile was measured at 18 and 42 WOA.

4. Pullets from FFF-fed breeders had higher antibody titres against IBV and NDV than pullets fed DMA (P < 0.05). Feeding FFF to offspring increased plasma ∑n-3 FA at 18 and 42 WOA, whereas feeding DMA to offspring reduced ∑n-6 FA at 18 WOA.

5. In conclusion, independent of breeder strain, alpha linoleic acid (ALA) and DHA sources showed varied responses. Feeding breeders FFF increased plasma concentration of antibody titres and n-3 FA whereas DMA reduced plasma concentration of ∑n-6 FA.

抽象的

1.考察了ISA Brown和Shaver White育种者及其后代的n-3脂肪酸（FA）饲喂源对抗体滴度和血浆FA谱的影响。

2.饲养员饲喂对照饮食（CON）；CON + 1％的微藻类（DMA：Aurantiochytrium limacinum）作为二十二碳六烯酸的来源；或CON +全脂亚麻籽（FFF）共挤出混合物的2.6％作为α-亚麻酸的来源。将一天大的雌性后代分配给饮食（后代）：1）CON-CON，2）CON-DMA，3）CON-FFF，4）DMA-CON，5）DMA-DMA，6）FFF-CON或7）FFF – FFF，然后是18周龄（WOA）至42 WOA的标准分层饮食。

3.在第6天和6个WOA时测定抗传染性支气管炎（IBV）和新城疫（NDV）的抗体滴度，在18和42 WOA时测定血浆FA谱。

4. FFF饲养的种鸡的IBV和NDV抗体滴度高于DMA饲喂的小鸡（P <0.05）。将FFF喂给后代会在18和42 WOA时增加血浆∑n-3 FA，而将DMA喂给后代则会在18 WOA时降低∑n-6 FA。

5.总之，独立于种系，α亚油酸（ALA）和DHA来源显示出不同的响应。饲养种鸽FFF增加了抗体效价和n-3 FA的血浆浓度，而DMA降低了∑n-6 FA的血浆浓度。