Apparent Digestibility of Nutrients in 5 Kinds of Mulberry Leaves with Different Sources for Tilapia (Oreochromis niloticus)

YANG Yang, CHEN Wenyan, LI Fajian, LIN Shimei, HUANG Xianzhi

doi:10.3969/j.issn.1006-267x.2014.11.040

2014 , Vol. 26 >Issue 11: 3493 - 3499

DOI: https://doi.org/10.3969/j.issn.1006-267x.2014.11.040

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Apparent Digestibility of Nutrients in 5 Kinds of Mulberry Leaves with Different Sources for Tilapia (Oreochromis niloticus)

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1. College of Animal Science and Technology, Southwest University, Chongqing 400716, China;
2. Key Laboratory of Freshwater Fish Reproduction and Development of Ministry of Education, Southwest University, Chongqing 400716, China;
3. Institute of Sericulture and Systems Biology, Southwest University, Chongqing 400716, China

Received date: 2014-05-28

Online published: 2014-11-17

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Abstract

In this study, apparent digestibility of nutrients in 5 kinds of mulberry leaves with different sources for tilapia were determined and compared. 1# and 2# mulberry leaves were collected from Chuxiong city in Yunnan province, 3# and 4# mulberry leaves were collected from Zhouzhi county of Xi'an city in Shanxi province, and 5# mulberry leaves were collected from Hechuan area of Chongqing city. The experimental diets were formulated to contain 70% basal diet and 30% tested ingredient with 0.5% chromic oxide as an exogenous indicator. A total of 350 one-year-old genetic improvement of farmed tilapias (GIFT) with the average body weight of (55.3±2.5) g were randomly allocated 6 groups with 3 replicates per group and 25 fish per replicate. Fecal samples were collected from each replicate of fish using siphonage after feeding 12 days (fed basal diet for 7 days firstly, and then fed experimental diets for 5 days) in the room circulation farming system, and continued for 10 days. The results showed that the apparent digestibility of dry matter (DM), crude protein (CP), total amino acid (TAA), ether extract (EE) and total phosphorus (TP) in 5 kinds of mulberry leaves was 32.9% to 56.3%, 68.7% to 83.7%, 69.27% to 87.65%, 31.8% to 63.1% and 34.6% to 56.9%, respectively. Among them, the apparent digestibility of DM and CP in 1#, 2# and 3# mulberry leaves was higher, and significantly higher than that in 4# and 5# mulberry leaves (P<0.05). The apparent digestibility of TAA and essential amino acid (EAA) in 1# and 3# mulberry leaves was higher, which was more than 87%. The apparent digestibility of TAA and EAA in 5# mulberry leaves was less than 70%, and significantly lower than that in other mulberry leaves (P<0.05). For the same mulberry leaves, the apparent digestibility of 17 kinds of amino acids had great difference, and did not show any regulation. The results indicate that there are certain differences among the apparent digestibility of nutrients in mulberry leaves with different sources for tilapia. 1# and 3# mulberry leaves as the better vegetable protein sources can be properly used in the diet of tilapia, but the amount of 5# mulberry leaves should be controled.

Key words： tilapia; mulberry leaves; nutrients; apparent digestibility; amino acids

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YANG Yang, CHEN Wenyan, LI Fajian, LIN Shimei, HUANG Xianzhi . Apparent Digestibility of Nutrients in 5 Kinds of Mulberry Leaves with Different Sources for Tilapia (Oreochromis niloticus)[J]. Chinese Journal of Animal Nutrition, 2014 , 26(11) : 3493 -3499 . DOI: 10.3969/j.issn.1006-267x.2014.11.040

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