Estimates of Genetic Parameters for Dairy Crossbred Female Fertility Traits
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Abstract
The investigated traits were age at first service (AFS, mo), age at first calving (AFC, mo), interval from calving to first service (DTFS, d), interval between first and last service (DFTC, d), interval from calving to conception or day open (DO, d), calving interval (CI, d), number of service per conception (NSPC, n), conception at first service (FSC, %), Pregnancy within 56d (P56, %) and pregnancy within 90d (P90, d). The studied objectives were 1) to estimate genetic parameters for various fertility traits of Thai dairy crossbred heifers and cows using univariate and bivariate analyses with Linear animal model (LAM) and 2) to compare the parameter estimates of fertility traits which are categorical and binary traits (NSPC, FSC, P56 and P90) with Threshold animal model (TAM) and LAM. The data from the Bureau of Biotechnology and Animal production, DLD calving between 2002 and 2015 were used. The data for univariate and bivariate analysis consisted of 71,515 and 82,633 records on heifers and cows, respectively whereas the data for bivariate analyses for each trait in heifers and cows were 148,269 records. Heifers had better average fertility performance than cows. Estimated heritability of the investigated fertility traits using univariate with LAM were 0.07 or less except AFS and AFC. Moreover, the estimated genetic correlations among fertility traits within heifers (between DFTC and NSPC (0.93), FSC (-0.76), P56 (-0.99) and P90 (-0.99)) and cows (between DFTC and NSPC (0.95), FSC (-0.93), P56 (-0.99), P90 (-0.99), DO (0.90) and CI (0.89)) indicated that selection DFTC in heifers and cows would achieve the largest genetic progress in the ability to conceive and maintain pregnancy (FSC, NSPC). Therefore, DFTC, NSPC or FSC could be used as one of the best indicators for heifer/cow fertility and could be complemented by more highly heritable other traits such as AFS of heifers and DTFS of cows in term of fertility index that would enable efficient selection for better fertility. Additionally, genetic correlations for the same fertility traits between heifers and cows were far from 1. This indicated that fertility traits of heifers and cows are different. Therefore, they should be considered as different traits in genetic evaluation.
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วิชัย ทิพย์วงค์, มนต์ชัย ดวงจินดา, เทวินทร์ วงษ์พระลับ, วิโรจน์ ภัทรจินดา, และจินตนา วงศ์นากนากร. 2548. การประมาณค่าพารามิเตอร์ทางพันธุกรรมของลักษณะความสมบูรณ์พันธุ์ ในโคนมด้วยวิธีวิเคราะห์ร่วมหลายลักษณะ. น. 99-100. ใน: สัมมนาวิชาการเกษตร ประจำปี 2548 24 -25 ม.ค. 2548. คณะเกษตรศาสตร์ มหาวิทยาลัยขอนแก่น: 2548.
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