Incorporation of tail weight and tail percentage at harvest size in selection programs for the Pacific white shrimp Penaeus ( Litopenaeus ) vannamei
| Autor: | Hugo H. Montaldo, Alejandra Caballero-Zamora, Gabriel R. Campos-Montes, Héctor Castillo-Juárez, Alfonso Martínez-Ortega, Mario Armenta-Córdova |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0301 basic medicine
biology Restricted maximum likelihood Ecology Population structure Litopenaeus 04 agricultural and veterinary sciences Aquatic Science biology.organism_classification Body weight Genetic correlation Shrimp 03 medical and health sciences 030104 developmental biology Animal science 040102 fisheries 0401 agriculture forestry and fisheries Variance components Penaeus |
| Zdroj: | Aquaculture. 468:293-296 |
| ISSN: | 0044-8486 |
| Popis: | The objective of this study was to estimate the value of incorporating tail weight (TW), and tail percentage (TP) as additional selection criteria to body weight (BW) at harvest size in Pacific white shrimp ( Penaeus ( Litopenaeus ) vannamei ) breeding programs. A total of 8208 records of BW and TW at harvest size were obtained in 2010 from four performance ponds located on the northwest coast of Mexico, where shrimp were grown under a range of commercial-like management conditions. This study used information from 150 female families (112 sires). The population structure is based on full- and half-sib families. (Co)variance component estimates for BW, TW, and TP were estimated using REML and ASReml software with bivariate animal models. A profit equation was developed to determine the relative economic value for BW and TP in shrimp in Mexico. Selection index procedure was used to assess the effect of including or not including TP as an additional selection criterion to BW in terms of selection response for an economic breeding objective. Heritabilities (± standard error) for BW, TW and TP were estimated as 0.15 ± 0.08, 0.16 ± 0.08 and 0.12 ± 0.04, respectively. Genetic and phenotypic correlations between body weight and tail weight were essentially 1 (0.99 ± 0.01 and 0.99 ± 0.001, respectively), which implies that, in practical terms, they are statistically almost the same trait. Genetic correlation between TW and TP was slightly higher (0.48 ± 0.24) than that between BW and TP (0.36 ± 0.28), but both have relatively high standard errors. Economic selection responses using only BW compared to an economic selection index incorporating BW and TP as selection criteria were 99.5 and 96.6% with evaluation based on one phenotypic record and the average of 54 full-sib records, respectively. Increasing the relative economic weight for TP tenfold changed these figures to 99.4 and 96.3%, respectively. In conclusion, results from this study indicate that there is no reason to replace BW with TW, or to incorporate TP as an additional selection criterion for breeding programs in P. vannamei . Statement of relevance Although tail weight is the main marketing product in the shrimp industry, it has a very high phenotypic and genetic correlation with body weight. Measuring tail traits adds costs and do not improve the efficiency of P. vannamei breeding programs. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect