Protein sources and digestive enzyme activities in jundiá (Rhamdia quelen)

Scientia Agricola

Rafael Lazzari²  João Radünz Neto¹  Fabio De Araújo Pedron²  Vania Lucia Loro¹  Alexandra Pretto¹  Carolina Rosa Gioda¹ 

[1] ,UFSM Depto. de Zootecnia Santa Maria RS ,Brasil

关键词: digestion;    nutrition;    soybean meal;    meat and bone meal;    fish meal;    digestão;    nutrição;    farelo de soja;    farinha de carne e ossos;    farinha de peixe;   

DOI  :  10.1590/S0103-90162010000300002

来源: SciELO

【 摘 要 】

Digestive enzymes activity influence feed utilization by fish, and its understanding is important to optimize diet formulation. This study reports the digestive enzyme activities of jundiá juveniles fed diets with protein sources. Fish were fed six experimental diets for 90 days: MBY (meat and bone meal + sugar cane yeast), SY (soybean meal + sugar cane yeast), S (soybean meal), MBS (meat and bone meal + soybean meal), FY (fish meal + sugar cane yeast) and FS (fish meal + soybean meal), and then sampled every 30 days and assayed in two intestine sections for digestive enzymes - trypsin, chymotrypsin and amylase - activities; gastric protease was assayed in the stomach. Digestive and hepatosomatic index, intestinal quotient, digestive tract length and weight gain were also measured. Trypsin and chymotrypsin activities were higher (p < 0.0001) in fish fed diets containing animal protein sources (MBY, MBS, FY and FS diets). Alkaline proteases were negatively affected by dietary soybean meal in the SY and S diets. Amylase activity had greater variation between diets and intestine sections. Fish fed MBY and MBS diets showed higher gastric protease activity (p < 0.0001). Weight gains were higher in fish fed the MBS and FS diets (p < 0.05). Highest values (p < 0.05) of digestive tract length were observed in fish fed MBS and FY diets, but no correlation with enzymes activities was found. Hepatosomatic index (HSI) was affected by diet composition. Dietary composition influenced digestive enzymes activities of jundiá.

【 授权许可】

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