Department of Animal Physiology, College of Animal Science and Livestock Production, Federal University of Agriculture, Abeokuta, Nigeria.
ACCG/PEARLS Research Programme, Directorate of University Farms, Federal University of Agriculture, Abeokuta, Nigeria.
J Anim Physiol Anim Nutr (Berl). 2021 Jul;105(4):715-724. doi: 10.1111/jpn.13480. Epub 2020 Dec 30.
Effect of extended storage on egg quality, embryo mortality and hatchability in FUNAAB-ɑ chickens was determined. Hatchable eggs (n = 288; weighing 53.2 ± 4.67 g) collected from a flock of FUNAAB-ɑ layer breeder hens aged 32 weeks were stored in egg tray with broad end up under 16 ± 1.5°C for either 0, 4, 8, 12, 16 or 20 d. Before incubation, eight eggs from each group were evaluated for internal and external quality traits. Remaining eggs were set in an incubator and transferred into hatcher on embryonic day 18. Data collected were subjected to one-way analysis of variance. Egg weight loss (EWL; p < .001), surface area (p < .001), yolk diameter (p < .001), inner and outer blastoderm diameters (p < .05) and dead in germ (DIG; p < .001) increased with storage duration while yolk height (p < .001), yolk index (p < .001), albumen weight (p < .05), albumen height (p < .05), albumen index (p < .01), Haugh's unit (HU; p < .05), fertility (p < .001), hatchability of set (HATCHS; p < .001) and fertile eggs (p < .05) decreased. Weight losses of 0, 1.2, 2.2, 3.4, 4.6 and 6.1% were recorded in egg stored for 0, 4, 8, 12, 16 and 20 days respectively. Eggs stored beyond 8 days exhibited higher DIG and lower HATCHS. Shell percentage in 4 days storage (11.4%) was lower (p < .05) than in 16 days storage (13.4%). Shell thickness was similar in eggs stored for 0 to 12 days, but 8 days storage (0.60 mm) had thinner (p < .01) shell than day 16 (0.71 mm) and day 20 (0.73 mm) storage. Internal quality unit (IQU) was higher (p < .05) in fresh eggs (180.4) than in 12 days (167.8) and 20 days (167.8) stored eggs. Extended storage of FUNAAB-ɑ eggs caused EWL, surface area shrinkage, lowered HU and IQU, loss of yolk and albumen quality, increased blastoderm diameters and DIG, and decreased egg fertility and HATCHS from day 8 forward. Storing FUNAAB-ɑ eggs beyond 8 days reduced quality parameters; therefore, other mitigating factors are recommended when storing beyond 8 days.
研究了延长储存时间对 FUNAAB-ɑ 鸡种鸡蛋品质、胚胎死亡率和孵化率的影响。从 32 周龄 FUNAAB-ɑ 层鸡种母鸡群中收集可孵化鸡蛋（n=288；重量为 53.2±4.67g），在 16±1.5°C 下将鸡蛋放在蛋托上，大头向上储存 0、4、8、12、16 或 20d。在孵化前，每组 8 个鸡蛋用于评估内部和外部质量特性。其余的鸡蛋放入孵化器，并在胚胎第 18 天转移到出雏器中。收集的数据进行单因素方差分析。鸡蛋失重（EWL；p<0.001）、表面积（p<0.001）、蛋黄直径（p<0.001）、内胚层和外胚层直径（p<0.05）和死精（DIG；p<0.001）随储存时间延长而增加，而蛋黄高度（p<0.001）、蛋黄指数（p<0.001）、蛋清重量（p<0.05）、蛋清高度（p<0.05）、蛋清指数（p<0.01）、哈夫单位（HU；p<0.05）、受精率（p<0.001）、入孵蛋孵化率（HATCHS；p<0.001）和受精蛋（p<0.05）下降。在 0、4、8、12、16 和 20d 储存的鸡蛋分别记录了 0、1.2、2.2、3.4、4.6 和 6.1%的失重率。储存超过 8d 的鸡蛋 DIG 更高，HATCHS 更低。4d 储存的蛋壳百分比（11.4%）低于 16d 储存（13.4%）（p<0.05）。在 0 至 12d 储存的鸡蛋中，蛋壳厚度相似，但 8d 储存（0.60mm）的蛋壳比 16d（0.71mm）和 20d（0.73mm）储存的蛋壳更薄（p<0.01）。内部质量单位（IQU）在新鲜鸡蛋（180.4）中较高（p<0.05），在 12d（167.8）和 20d（167.8）储存的鸡蛋中较低。FUNAAB-ɑ 鸡蛋的延长储存导致 EWL、表面积收缩、HU 和 IQU 降低、蛋黄和蛋清质量损失、胚层直径和 DIG 增加，以及从第 8 天开始的鸡蛋受精率和 HATCHS 降低。FUNAAB-ɑ 鸡蛋储存超过 8d 会降低质量参数；因此，建议在储存超过 8d 时采取其他缓解因素。
