Abstract
A total of 432 laying hens (40 weeks old) were used in a 10- weeks feeding trial. The birds were randomly assigned to 1 of 4 treatments with 18 replications (6 birds per replication) in a 2×2 factorial arrangement with low-density diet (LD), and high density (HD) diets supplemented with or without (0.1 %) of yeast. Laying hens feed intake during the 5th, 6th and 10th weeks has significantly increased (p<0.05) in LD diet and HD diet supplemented with (0.1 %) of yeast supplementation. However, egg production and broken rate was not affected with or without yeast and density diet. The quality of egg and shell color during the 5th, 6th, and 7th weeks has significantly reduced (p<0.05) by yeast supplementation with HD and LD diet. Eggshell strength was significantly improved at week 4, moreover albumin height was also significantly improved by yeast supplementation diets at week 5. During week 1 and 2 the yolk color was higher in LD diet and HD diet compared with yeast supplementation. However, eggshell strength was significantly improved on HD diets than LD diets during the 4th and 7th weeks. Eggshell color and albumen height were significantly decreased in laying hens fed HD or LD diets during week 5 and 6. The apparent total tract digestibility (ATTD) of dry matter (DM), nitrogen (N), and Energy was not affected (p<0.05) by laying hens fed with or without yeast and HD than LD diets. In summary, 0.1% of yeast supplementation proved a positive impact on feed intake and egg quality of layer chicken.
Highlights
Nutritional supplements are known as substances that have been applied in animal meals to enhance the quality of feed and quantity of animal products
The present research aimed to investigate the effect of high density (HD) and low-density diet (LD) diets, diets with or without yeast, performance on the feed intake, egg quality, and nutrient digestibility of laying hens
The present study revealed that dietary inclusion of yeast and density diets in laying hens had no statistical difference in egg production and broken rate
Summary
Nutritional supplements are known as substances that have been applied in animal meals to enhance the quality of feed and quantity of animal products. Several yeast products have been developed and used as growth promoters in livestock feed in the past decades. Yeasts with high levels of enzymes, vitamins, and other nutrients have been shown to improve egg production (Yalcin et al, 2008; Tapingkae et al, 2017). Yeast products have been found to be more effective than other probiotics in improving the characteristics or traits of birds Resinger et al, 2012; Yasar & Desen 2014; Yasar & Yegen (2017). Yeast has a beneficial impact on the hematology of the blood, resulting in improved animal welfare (Agazzi et al, 2011). Previous studies have favorable results on broiler’s dietary supplementation with S. cerevisiae (Wallace, 1994; Newbold et al, 1995; Gao, 2008). S. cerevisiae makes beneficial changes in the gut microbial population and maintains its natural microbial flora by stimulating the growth and proliferation of beneficial bacteria (Kumar et al, 2019)
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