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August 10, 2013

China

The Many Benefits of Yeast in Shrimp Feeds

 

From Abstract: In this study, nine commercial-scale shrimp ponds were used in a 60-day feeding experiment to determine the effects of yeast on the growth and immune response of white shrimp, Penaeus vannamei.  Three treatments (a control diet, diet-1 and diet-2) were designed to contain yeast levels of 0.0, 1.0 and 1.5 grams per kilogram, respectively.   At the end of the test, the mean production of diet-1 (0.649 ± 0.030 kilograms per square meter) and diet-2 (0.648 ± 0.033 kilograms per square meter) were significantly higher than the control diet by 29.5% and 29.3%, respectively.  Compared to the control diet, the feed conversion ratio decreased significantly for diet-I (12.3%) and diet-2 (8.5%).  The environmental indices indicate that the quality of water and pond sediment was improved.  The endotoxin concentrations, the number of Vibrios and heterotrophic bacteria in the shrimp intestine of the treatment groups were significantly lower than those of the control group, particularly in the later stage of growout.  The yeast extended positive effects on growth, improved sediment quality, reduced endotoxin in shrimp intestine and enhanced activities of lysozyme and phenoloxidase.

 

Source: Aquaculture Research.  Effects of a Yeast-Based Additive on Growth and Immune Responses of White Shrimp, Litopenaeus Vannamei (Boone, 1931), and Aquaculture Environment.  Deng Deng (dtwins_green@hotmail.com, The Key Laboratory of Mariculture, Ministry Education of China, Ocean University of China, 5 Yushan Road, Qingdao, 266003 China), Chengfang Mei, Kangsen Mai, Bei-Ping Tan, Qinghui and Hongming Ma.  Volume 44, Issue 9, Page 1348.  August 2013.

 

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