|
|||||
|
|
Phenotypic and genetic parameters for body measurements, reproductive traits and gut length of Nile tilapia (Oreochromis niloticus) selected for growth in low-input earthen ponds |
|
| Authors: | Harrison Charo-Karisa Henk Bovenhuis Raul W Ponzoni Hans Komen |
| Institution: | a Aquaculture and Fisheries Group, Wageningen Institute of Animal Sciences (WIAS), Wageningen University, P.O. Box 338, 6700 AH, Wageningen, The Netherlands b Animal Breeding and Genomics Centre, Wageningen Institute of Animal Sciences (WIAS), Wageningen University, P.O. Box 338, 6700 AH, Wageningen, The Netherlands c Regional Center for Africa and West Asia, The World Fish Center, Abbassa, Abou Hammad, Egypt d WorldFish Center, Jalan Batu Maung, 11960 Batu Maung, Penang, Malaysia |
| Abstract: | In this study we present estimates of phenotypic and genetic parameters for body size measurements, reproductive traits, and gut length for Nile tilapia (Oreochromis niloticus) selected for growth in fertilized earthen ponds for two generations. Throughout the experiment, ponds were fertilized daily with 50 kg dry matter, (dm)/ha chicken manure. No supplementary feeds were added. For the analysis, 6429 fully pedigreed experimental fish from G0, G1 and G2 were used. Generations were discrete and therefore parameters were estimated separately for each year. Heritability estimates for body measurements ranged from 0.4-0.6 for standard length to 0.69-0.79 for head length. Phenotypic correlations between body weight and body measurements ranged from 0.64 to 0.89. Genetic correlations were close to unity. The heritability estimate for maturity at harvest (corrected for sex) was 0.13. Heritabilities for carcass traits were estimated from G1 only and were 0.16 for gutted weight and 0.06 for dressing percentage. Phenotypic correlation between body weight and gutted weight was 0.84 and the genetic correlation was 0.20. Heritability estimate for gut length was 0.22. We also estimated a high genetic correlation between gut length index and standard length (0.78) but a low genetic correlation between gut length index and body weight (0.22 ± 0.28). These results suggest that selection for growth on an herbivorous diet could result in a correlated response in gut length. |
| Keywords: | Nile tilapia Oreochromis niloticus Heritability Phenotypic correlation Genetic correlation Reproduction Low-input Gut length |
| 本文献已被 ScienceDirect 等数据库收录！ | |