饲料蛋白水平对东方高原鳅生长性能的影响

doi:10.16378/j.cnki.1003-1111.2020.04.007

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Abstract A feeding trail was conducted to evaluate the effects of dietary protein levels on the growth performance of catfish-like loach Triplophysa orientalis. In total, 540 individuals of catfish-like loach with initial body weight of (18.36±0.91) g were randomly divided into 6 groups with 3 replicates per group and 30 fish per replicate and fed six diets containing 20%, 25%, 30%, 35%, 40% and 45% protein for 60 d. The results showed that food ingestion rate (FR) of catfish-like loach was increased first and then tended to be stable with increase in dietary protein level. The quadratic polynomial regression analysis revealed that the maximal FR was found in catfish-like loach fed the diet containing protein level of 40.77%. The weight gain rate (WGR) and specific growth rate (SGR) were found to be increased at first and then tended to be stable with increase in dietary protein levels. The broken line simulation of the WGR and SGR showed that the catfish-like loach had no longer significantly increase in WGR and SGR at dietary protein levels varying from 32.48% to 33.64%. The nitrogen intake and absolute nitrogen intake of catfish-like loach were increased with increase in dietary protein level and protein efficiency rate (PER) increased first and then decreased, with the maximal PER in the catfish-like loach fed the diet containing protein levels 27.17% by the quadratic polynomial regression analysis. However, broken line simulation indicated that the food conversion ratio (FCR) of catfish-like loach was decreased first and then tended to be stable with increase in dietary protein level, with the minimal FCR at dietary protein level of 29.37%. There were no significant differences in survival rate (SR), condition factor (CF), viscera-somatic index (VSI) and hepaticsomatic index (HSI) among the test groups. Furthermore, comprehensive analysis of the FR, WGR, SGR, PER and FCR revealed that the optimal dietary protein level for catfish-like loach is of 27.17%—33.64%. The findings are intended to provide theoretical basis for the scientific allocation of artificial diets in catfish-like loach.

Key words： Triplophysa orientalis protein level growth performance feed utilization morphological indicator

Received: 11 February 2019

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	Articles by authors
	WANG Wanliang
	SHI Haina
	ZENG Benhe
	WANG Jinlin
	ZHANG Qingyu

Cite this article:

WANG Wanliang,SHI Haina,ZENG Benhe, et al. Effects of Dietary Protein Levels on Growth Performance of Catfish-like Loach Triplophysa orientalis[J]. Fisheries Science, 2020, 39(4): 517-523.

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https://www.shchkx.com/EN/10.16378/j.cnki.1003-1111.2020.04.007 OR https://www.shchkx.com/EN/Y2020/V39/I4/517

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