Abstract
Objective:The objective of this study was to estimate the heritability (h2), repeatability (r), and correlations (rŷiyi) 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 (hf2) and maternal (hm2), repeatability, rabbit index IC, and Pearson’s correlations (rŷiyi) 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. h2 presented magnitudes between low and medium. hf2 ranged between 0.09 and 0.42 and between 0.11 and 0.45 for hm2. In general, the values of hm2 were higher than the values of hf2. 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. rŷiyi 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.
Highlights
Rabbit production is an economical alternative in rural and urban areas of the tropics, so its productivity is limited by the climatic conditions themselves [1]
The r values for the traits litter size at birth (LB), born alive (BA), litter weight born alive (LW), litter weight at weaning (LWW), and slaughter weight (SW) presented low magnitude, while it was medium for weaning weight (WW) and carcass weight (CW)
The production of rabbits under tropical conditions is similar to other reports
Summary
Rabbit production is an economical alternative in rural and urban areas of the tropics, so its productivity is limited by the climatic conditions themselves [1]. Estimation of heritability (h2), repeatability (r ), and correlations (rxy) among the traits of economic importance at the zootechnical level is that these define the appropriate selection method; they constitute determining factors in the selection response. For this reason, their estimation must be as precise as possible [7]. It is necessary to carry out genetic evaluation work of the reproducers, which requires characterized populations and large genetic variability On this aspect, the success of Correspondence Darwin Yovanny Hernndez-Herrera University of Sucre, Sincelejo, Colombia
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