Genetic parameters of growth traits and carcass weight of New Zealand white rabbits in a tropical dry forest area

Objective: The objective of this study was to estimate the heritability (h(2)), repeatability (r), and correlations (r((y) over cap yi)) in some traits of zootechnical interest in a population of New Zealand white rabbits of a tropical dry forest area. Materials and Methods: Three mating groups were formed, each one of 1 male and 70 females. The traits evaluated were litter size at birth (LB), born alive (BA), born dead (BD), litter weight born alive (LW), litter weight at weaning (LWW), weaning weight (WW), slaughter weight (SW), and carcass weight (CW). Weaning took place at 42 days, and the fattening phase lasted 60 +/- 3 days. A descriptive statistical study was carried out on the study variables. Paternal heritability was estimated (h(f)(2)) and maternal (h(m)(2)), repeatability, rabbit index IC, and Pearson's correlations (r((y) over cap yi)) between traits. The descriptive statistics showed high variation for the BD traits. Results: The values of the productivity found were similar to those presented in studies around the world. h(2) presented magnitudes between low and medium. h(f)(2) ranged between 0.09 and 0.42 and between 0.11 and 0.45 for h(m)(2). In general, the values of h(m)(2) were higher than the values of h(f)(2). The r values for the traits LB, BA, LW, LWW, and SW presented low magnitude, while it was medium for WW and CW. From the values of r, IC was calculated for each of the rabbits, allowing their categorization, which will be used in future selection plans. r((y) over cap yi) among the variables ranged from -0.01 to 0.860. They were generally positive and mostly not significant (p > 0.05); they took a magnitude from low to moderate, except for the correlation between LB and BA. Conclusion: The production of rabbits under tropical conditions is similar to other reports. The genetic parameters evaluated were medium-to-low, indicating a robust non-additive gene and/or environmental effect.