Influence of yeast hydrolysate supplement on growth performance, nutrient digestibility, microflora, gas emission, blood profile, and meat quality in broilers

Vetriselvi Sampath1, Kyudong Han2,3, In Ho Kim1,*
Author Information & Copyright
1Department of Animal Resource and Science, Dankook University, Cheonan, 31116, Republic of Korea, Cheonan 31116, Korea.
2Department of Microbiology, College of Science & Technology, Dankook University, Cheonan 31116, Korea.
3Center for Bio Medical Engineering Core Facility, Dankook University, Cheonan 31116, Korea.
*Corresponding Author: In Ho Kim, Department of Animal Resource and Science, Dankook University, Cheonan, 31116, Republic of Korea, Cheonan 31116, Korea, Republic of. E-mail:

© Copyright 2021 Korean Society of Animal Science and Technology. This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Received: Jan 21, 2021; Revised: Mar 05, 2021; Accepted: Mar 26, 2021

Published Online: Apr 02, 2021


A total of one thousand five hundred and twelve Ross 308 broilers (one - day - old) were taken and assigned (random blocks) to 1of 3 dietary treatments with 28 replicates of 18 chicks/cage. The dietary treatments were Corn-soybean-meal-based basal diet supplemented with 0, 0.1%, and 0.2% of commercial yeast hydrolysate (YH (<italic>Saccharomyces cerevisiae</italic>)). The dietary inclusion of YH supplementation has linearly increase broilers body weight gain on d 21, 35, and overall (<italic>p=</italic>0.044, 0.029, and 0.036, respectively) experimental period. In addition, the increased level of YH supplementation has linearly reduced feed conversation ratio of broilers on d 21, 35, and overall trial period (<italic>p</italic>=0.041, 0.052, and 0.032, respectively). However, the feed intake and mortality of broilers were not affected by the graded level of YH supplementation. Though nutrient digestibility of dry matter (<italic>p</italic>=0.012) and nitrogen (<italic>p</italic>=0.021) was linearly increased in broilers fed YH supplementation, at the end of the trial it fails to affect the total track digestible energy. Dietary inclusion of YH supplementation showed a beneficial effect on the microbial population as linearly improved <italic>lactobacillus </italic>(<italic>p</italic>=0.011) and reduced <italic>E. coli</italic> counts (<italic>p</italic>=0.042). An increasing level of YH supplementation has tended to decrease NH<sub>3</sub> (<italic>p</italic>=0.069) and linearly decrease H<sub>2</sub>S (<italic>p=</italic>0.027) of noxious gas emission in broilers. Moreover, dietary YH supplements trend to increase the glucose (<italic>p</italic>=0.066) and reduced cholesterol (<italic>p</italic>=0.069) level. At the end of the test, YH supplementation elicited a linear reduction in drip loss (<italic>p</italic>=0.045, and 0.021) on days 5 and 7, respectively. Furthermore, dietary inclusion of YH supplementation had linearly increased villus height (<italic>p</italic>=0.051) but fails to affect crypt depth. Therefore, in terms of positive effects on the broiler’s overall performance, we suggest that dietary supplements containing graded YH levels in the broilers diet could serve as a potential alternative for growth promoters.

Keywords: yeast hydrolysate; brewer yeast; broilers; growth performance

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