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Srinoy Chumkam
Orapint Jintasaporn


Yeast and yeast products are rich in nutrients and nutraceuticals. They can be used in improving egg production and egg quality as a consequence. The aim of this study was to investigate the effect of supplementing yeast and yeast products as feed additives in layer diets on performance and egg traits. A total of 250 commercial laying hens, aged 32 weeks, were randomly distributed in completely randomized design. The hens were distributed into 5 treatments.  The experimental treatments were  basal diets,  basal diets supplemented with 5.0% whole cell yeast, basal diets supplemented with 2.0% autolyzed yeast, basal diets supplemented with 0.25 % nucleotide, and   basal diets supplemented with 0.05% beta-glucan. The treatments lasted for 8 weeks. The resulted showed that those supplemented with whole cell yeast increased most of the egg weight (p<0.05) during 36-37, 38-39 and 32-39 weeks old. The feed intake of layer in treatments of whole cell yeast and nucleotide supplementation was significantly higher (p<0.05) than other treatments during 34-35 weeks old. The better (p<0.05) feed efficiency ratio was founded in those fed with whole cell yeast during 36-37 weeks old,   which was  5.94 % lower than that of the control group. . This value tended to be better than the other treatments (p=0.081) during 38-39 weeks old. Nucleotide supplementation significantly exhibited the highest value (p<0.05) of Haugh unit score and albumen hight during 34-35, 36-37, 38-39 and 32-39 weeks old.  Supplementing yeast and nucleotide contributed to a larger egg size compared to those without supplementation (p<0.05). Supplementing the diets with whole cell yeast was beneficial for increasing egg weight and improving feed conversion ratio. Supplementing nucleotide in laying diet improving albumen quality. Supplementing both whole cell yeast and nucleotide in layer diet increased the number of larged-size eggs.   


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