Abstract

OSSA SARAZ, Gustavo Alfonso et al. Retrospective analysis of reproductive traits in Colombian Romosinuano creole bovine females. Cienc. Tecnol. Agropecuaria [online]. 2021, vol.22, n.1, e1804.  Epub Jan 01, 2021. ISSN 0122-8706.  https://doi.org/10.21930/rcta.vol22_num1_art:1804.

The study’s objective is to estimate the repeatability of calving intervals and establish its relationship with different Romosinuano females’ reproductive efficiency characteristics. We analyzed a database with 3,112 useful records of 871 females, collected in 1936-2016 from the Nation’s Germplasm Bank System for Food and Agriculture, Turipaná research center. The model used to calculate the variance components needed to estimate the repeatability of calving intervals value was an animal model of repeated measures over time. The variance components were estimated using the rptR package of the R software, specialized in statistical data analysis. Based on the estimated repeatability value, we calculated and correlated each female’s genetic value and most probable producing ability. The estimated average values of the calving interval, repeatability, reproductive efficiency, and correlation between genetic value and most probable producing ability were 379.74 ± 47.74 days, 0.02 ± 0.01, 96%, and 93.7%, respectively. The estimated repeatability for the calving interval was low, showing a low correlation between the females’ calving intervals of the analyzed herd. The high reproductive efficiency of the Romosinuano breed indicates great adaptation to the environment, making crossbreeding an opportunity for the national herd’s reproductive efficiency improvement.

Keywords : animal models; genetic parameters; genetic resources; genetic value; repeatability.

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