Effects of DL-methionine supplementation on the success of fish meal replacement by plant proteins in practical diets for juvenile gibel carp (Carassius auratus gibelio)

• DOI: 10.1111/anu.12461
• Publication Date: 2016-07-18T04:35:24Z
• Authors: M. Ren; H. Liang; J. He; K. Masagounder; Y. Yue; H. Yang; X. Ge; J. Xie; B. Xi
• Keywords: 0303 health sciences; 03 medical and health sciences

A ten-week feeding trail was conducted to investigate the effects of increasing DL-methionine (Met) supplementation on success fish meal (FM) replacement with plant proteins in practical diets for juvenile gibel carp, Carassius auratus gibelio. Twelve isoenergetic were formulated including two 150 g kg−1 FM (Diet 1—positive control 1 reflecting a commercial diet and Diet 2—positive 2 but balanced essential amino acid (EAA) profile) ten 50 (negative controls) supplemented graded levels (0–3.0 kg−1) DL-Met (Diets 3–12). Each fed triplicate groups near satiation four times daily 10 weeks. EAA profile produced better final weight, specific growth rate (SGR) feed conversion ratio (FCR) than negative containing no supplemental Met 3), did not significantly differ from 1. However, (0.5–3.0 4–12) performances similar those positive 2). Based quadratic regression analysis, optimal dietary level 5.2 cysteine (Cys) found be 7.1 dry SGR FCR. The corresponding total sulphur requirements (Met + Cys) this species calculated 12.3 showed decreasing trend plasma cholesterol contents (p < .05). No significant differences observed whole-body composition, protein, triglyceride free among treatments, while aspartate transaminase, albumin ammonia influenced by levels. Juvenile carp grew equally well or acids. results study overall indicate that balancing is key strategy successfully reducing carp.