Hassanabadi Ahmad, Aalipour Hassan, Zarghi Heydar, Salehan Mohammadreza, Gharedaghi Ramyar
Department of Animal Science, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran.
Vet Med Sci. 2025 Sep;11(5):e70517. doi: 10.1002/vms3.70517.
Broken-shell eggs in aged laying hens cause great losses to the egg industry. Saccharomyces cerevisiae yeast may improve shell quality by modulating intestinal health and oviduct function.
This study was carried out to determine the effects of supplementing Saccharomyces cerevisiae yeast extract (SYE) to the diets of aged commercial laying hens.
A total of 192 Shaver White laying hens aged 105-116 weeks were allocated to four dietary levels of SYE (0, 1.0, 2.0, 3.0 g/kg diet), with 6 replicates of 8 birds each. The experiment was performed in a randomized complete block design.
The use of different levels of SYE caused a significant linear and quadratic increase in the percentage of laying and daily egg mass production (p < 0.05). Feed intake (FI) in the 3 g/kg treatment was significantly higher than the control treatment in 113-116-week period (p < 0.05). The percentage of eggshell and shell thickness at 105-116 weeks of age (total period) in the 3 g/kg treatment was significantly higher than the control treatment (p < 0.05). Orthogonal comparison of the supplemented SYE against the control treatment also showed that the use of SYE in the diet significantly increased (p < 0.05) the percentage of shell (12.2% vs. 11.4%) and eggshell thickness (0.384 vs. 0.362 mm) compared to the control treatment.
The use of different levels of SYE did not have a significant effect on production performance indicators in old laying hens of the Shaver White strain. It significantly increased the thickness and relative weight of eggshell. Supplementing SYE 3 g/kg diet significantly increased the average eggshell percentage and shell thickness.
老龄蛋鸡产出的破壳蛋给蛋鸡产业造成了巨大损失。酿酒酵母可能通过调节肠道健康和输卵管功能来改善蛋壳质量。
本研究旨在确定在老龄商品蛋鸡日粮中添加酿酒酵母提取物（SYE）的效果。
将192只105 - 116周龄的海兰白蛋鸡分配到四个SYE日粮水平组（0、1.0、2.0、3.0 g/kg日粮），每组8只鸡，重复6次。实验采用随机完全区组设计。
使用不同水平的SYE使产蛋率和日产蛋量显著呈线性和二次增加（p < 0.05）。在113 - 116周龄期间，3 g/kg处理组的采食量（FI）显著高于对照组（p < 0.05）。在105 - 116周龄（整个时期），3 g/kg处理组的蛋壳百分比和蛋壳厚度显著高于对照组（p < 0.05）。补充SYE与对照处理的正交比较还表明，日粮中使用SYE与对照处理相比，显著提高了（p < 0.05）蛋壳百分比（12.2%对11.4%）和蛋壳厚度（0.384对0.362 mm）。
使用不同水平的SYE对海兰白品系老龄蛋鸡的生产性能指标没有显著影响。它显著增加了蛋壳的厚度和相对重量。在日粮中添加3 g/kg的SYE显著提高了平均蛋壳百分比和蛋壳厚度。
