Genotype by environment interaction effects for body weight at 130 days of age in the Pacific white shrimp [Penaeus (Litopenaeus) vannamei]

Abstract

BODY WEIGHT OF PACIFIC WHITE SHRIMP [PENAEUS (LITOPENAEUS) VANNAMEI] AT 130 DAYS OF AGE WAS ANALYZED IN THREE ENVIRONMENTS CORRESPONDING TO DIFFERENT MANAGEMENT SYSTEMS: SEMI-INTENSIVE (10 SHRIMP/M2) IN POZOS, SINALOA (POZOS10), INTENSIVE (30 SHRIMP/M2) IN POZOS, SINALOA (POZOS30), AND SUPER-INTENSIVE (85 SHRIMP/M2) IN BAHIA DE KINO, SONORA (KINO85). DATA WERE OBTAINED FROM 18 087 SIBS FROM 113 SIRES AND 143 DAMS. THE AIM OF THE STUDY WAS TO EVALUATE THE PRESENCE OF GENOTYPE BY ENVIRONMENT INTERACTION EFFECTS (IGA) AND THE EFFECT OF THE (CO)VARIANCE BETWEEN FULL-SIBS FAMILY COMMON EFFECTS ON THE GENETIC PARAMETER ESTIMATES. ESTIMATES OF H2 WITH A MODEL INCLUDING INDEPENDENT FULL-SIBS FAMILY COMMON EFFECTS WERE BETWEEN 0.26 AND 0.39 ACROSS ENVIRONMENTS, WHILE THE ESTIMATES FOR A MODEL WITH CORRELATED FULL-SIBS FAMILY COMMON EFFECTS WERE ESTIMATED BETWEEN 0.14 AND 0.23. NO DIFFERENCES WERE FOUND FOR H2 VALUES BETWEEN ENVIRONMENTS. THE GENETIC CORRELATIONS BETWEEN ENVIRONMENTS WERE NOT LOWER FROM UNITY WITH ANY MODEL; THEREFORE, IT IS CONCLUDED THAT NO EVIDENCE OF GENOTYPE-ENVIRONMENT INTERACTION EXISTS FOR BODY WEIGHT AT 130 DAYS IN PACIFIC WHITE SHRIMP, UNDER THE ENVIRONMENTS USED IN THIS STUDY. THE INCLUSION OF THE (CO)VARIANCE BETWEEN FULL-SIBS FAMILY COMMON EFFECTS OF DIFFERENT ENVIRONMENTS AFFECTED THE PARAMETER ESTIMATES. THESE RESULTS ALSO INDICATE THAT RANKING OF THE BREEDING ANIMALS WILL BE SIMILAR IN ALL THE STUDIED PRODUCTION ENVIRONMENTS.