Genetic Parameters and Genetic Gain for the Reproduction Traits in Latvian Landrace and Yorkshire Sows Populations

Abstract

The aim of this study was to estimate genetic parameters for the reproduction traits of Landrace and Yorkshire sows and to analyze the genetic gain in these Latvian swine populations. Records of 14 577 first-parity and 27 359 later-parities Landrace sows and 6039 first-parity and 12 360 later-parities Yorkshire sows born between 2000 and 2012 were included in the analysis. The number of piglets born alive and 21-day litter weight at first and later parities, and weaning-conception interval between the first and second parity were included in the study. The genetic parameters were estimated using a single-trait animal model for the first parity and a single-trait repeatability animal model for later parities using REML procedure. Compared to heritability estimates for number born alive, heritabilities for litter weight were higher in both populations: in the first parity 0.10±0.015 vs. 0.31±0.021 for Landrace, and 0.05±0.016 vs. 0.23±0.028 for Yorkshire; in later parities 0.10±0.010 vs. 0.23±0.013 for Landrace, and 0.10±0.017 vs. 0.20±0.022 for Yorkshire. The heritability of reproduction traits was low; however, during the last ten years, reproduction traits in nucleus herds were improving. The results show that genetic progress in the last five years has been relatively low.

Genetic evaluation including maternal effects in Large White Yorkshire × desi crossbred pigs under hot and humid conditions of India

“…The main reason is the method of estimation where animal and individual permanent environmental effects were the only sources of random variation included. Other studies including these sources report lower values of heritability for the trait (Chimonyo et al 2006, Imboonta et al 2007, Fernandez et al 2008, Chansomboon et al 2010, Dube et al 2012, Paura et al 2014.…”

Identifikasi Sifat-Sifat Produksi Persilangan Babi Duroc ean Yokshire

“…Hal penting mengenai parameter produksi pada ternak babi yang dipengaruhi oleh persilangan antar bangsa babi menurut Pardosi (2004) diantaranya jumlah anak babi yang dilahirkan per induk perkelahiran, berat lahir, jumlah anak lepas sapih, dan berat sapih. Persilangan akan meningkatkan produktivitas pada babi Yorkshire sesuai laporan Paura et al (2014) and Mondal et al (2014). Berdasarkan uraian tersebut diatas, maka dilakukan penelitian untuk mengetahui pengaruh bangsa babi terhadap litter size, berat lahir, berat sapih dan mortalitas anak babi prasapih pada babi Yorkshire, dan Duroc serta persilangannya.…”

Pendugaan Nilai Heritabilitas Bobot Lahir Dan Bobot Sapih Pada Babi Duroc Dan Yorkshire

“…Heritabilitas bobot lahir dan bobot sapih babi dari bangsa Duroc (0,26±0,19 dan 0,15±0,21) serta Yorkshire (0,34±0,12 dan 0,47±0,36). Nilai heritabilitas bobot lahir dan bobot sapih yang diperoleh ini lebih tinggi dengan penelitian National Swine Registry (2015) pada babi sebesar 0,30 pada bobot lahir dan 0,17 pada bobot sapih; Paura et al (2014) bobot sapih pada babi Yorkshire 0,23±0,028, Dufrasne et al (2010) pada babi Pietrain memiliki heritabilitas bobot lahir sebesar 0,25±0,07 dan sapih sebesar 0,42±0,008 sedangkan Tian et al (2015) melaporkan nilai heritabilitas bobot lahir dan sapih pada babi Large White sebesar 0,11±0,01 dan 0,10±0,02. Perbedaan estimasi heritabilitas heritabilitas bobot lahir dan bobot sapih dengan penelitian yang lainnya disebabkan karena perbedaan populasi yang mempunyai lingkungan yang heterogen.…”