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Copyright of Journal of Hydrobiology / Shuisheng Shengwu Xuebao is the property of Editorial Department of Journal of Hydrobiology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Hydrobiology / Shuisheng Shengwu Xuebao is the property of Editorial Department of Journal of Hydrobiology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The experiment was conducted to investigate the effects of dietary protein source and stocking density on growth performance, body composition and serum biochemical parameters of grass carp (Ctenopharyngodon idellus). A two-factor orthogonal experiment (3x5) was used to evaluate the effects of soybean meal (SM), Clostridium autoethanogenum protein (CAP), Tenebrio molito (TM), cottonseed protein concentrate (CPC) and Chlorella (CH) for grass carps with three stocking density. Five isonitrogenous and isoenergetic diets were prepared with the five protein sources as a single protein source, respectively. Grass carps with an initial body weight of (5.36±0.18) g were fed with the five test diets at three stocking density (0.11, 0.16 and 0.21 kg/m³) for 60 days in pond cages (1.0 mx1.0 mx1.5 m), respectively. The results showed that the feed coefficient (FCR) increased, and the specific growth rate (SGR), weight gain rate (WGR), protein efficiency (PER) and liver index (HSI) decreased with the increase of stocking density. Under the three stocking densities, FCR in TM group was significantly higher than that of other protein source groups (P<0.05), and FBW, SGR, WGR and PER were significantly lower than those in other protein source groups (P<0.05). The growth performance of grass carp in the 0.11 and 0.16 kg/m³ stocking density groups were similar, and were significantly better than that in the 0.21 kg/m³ stocking density group (P<0.05). Protein source and stocking density had no significant effects on the moisture, crude protein and ash content of the whole grass carp (P>0.05). The crude fat content of grass carp in the 0.21 kg/m³ stocking density group was significantly lower than that in other stocking density groups (P<0.05), and the serum biochemical indexes of aspartate aminotransferase (AST), alanine aminotransferase (ALT) and glucose (GLU) were significantly higher than those in other stocking density groups (P<0.05). Regardless of the stocking density, the serum albumin (ALB) content of the CH group was significantly higher than that in the CAP group, the TM group and the CPC group (P<0.05). The alkaline phosphatase activity of TM group was significantly higher than that in the CAP group (P<0.05). Based on the protein efficiency and weight gain rate, the ability of grass carp to utilize the five protein sources was CAP=CH=CPC =SM>TM. [ABSTRACT FROM AUTHOR]

The experiment was to investigate the effect of different protein in feed on growth and health of weaned piglets. 108 35-day-old weaned piglets were selected, and randomly divided into four groups according to their body weight and gender, with four replicates in each group and 6~8 piglets in each replicate, half in male and famale. The protein raw materials of treatment 1 were spray dried plasma protein and fish meal, treatment 2 were low level potato protein and fish meal, treatment 3 were high level potato protein and fish meal, and treatment 4 were earthworm protein and fish meal. The experiment lasted for 25 d. The results showed that the growth and health status of weaned piglets fed with spray dried plasma protein powder and fish meal were the best. Compared with potato protein, ADG and ADFI of piglets supplemented with earthworm protein were higher. The addition of low-level potato protein was better for the growth of piglets than high-level addition. The experiment indicates that domestic potato protein and earthworm meal cannot completely replace plasma protein meal in the first stage of diet configuration of weaned piglets, the effect of earthworm meal replacing plasma protein meal and fish meal on performance of piglets is better than that of potato protein meal. [ABSTRACT FROM AUTHOR]