Heritability Estimates of Adult Body Weight and Egg Production Traits in Indigenous Uttara Chickens

Abstract

Data on female adult body weight and egg production measurements were analysed to obtain their heritability estimates. The me an values for body weight and egg production at various ages showed good performance of indigenous Uttara chicken. The heritability estimates observed for body weight decrease with increasing age of birds. The heritability values for various egg production traits at 40 and 58 weeks were low too high in magnitude. Changes in heritability estimates across different ages indicated expression of different genes at different ages of the Uttara fowl and the reduction of environmental effects as the floc k is maintained under quite uniform environmental conditions.

Heritabilitas Produki Telur Ayam Lokal Papua Berbeda Genotip dari Lokus 24- bp Insertion-Deletion dalam Promotor Gen Prolaktin

“…Nilai h 2 jumlah telur yang ditemukan dalam penelitian ini masih jauh lebih tinggi dibandingkan dengan nilai h 2 jumlah telur hingga umur 40 minggu (280 hari) pada ayam asli Uttara (ayam asli dari Uttarakhand, negara bagian di India), sebagaimana yang dilaporkan Singh et al (2018), yaitu sebesar 0,14 ± 0,05; namun h 2 berat telur hingga umur 40 minggu (280 hari) dilaporkannya jauh lebih tinggi (0,47 ± 0,13) dibandingkan h 2 berat telur pada hasil penelitian ini. Sabri et al (1999) menemukan bahwa nilai heritabilitas jumlah telur pada periode umur 26-30 minggu ayam White Leghorn di lingkungan subtropis sebesar 0,271±0,173.…”

Análise genética de características de produção e qualidade de ovos de linhagens de aves caipiras (>i<Gallus gallus>/i<) utilizando modelos de regressão e multivariados

“…Na literatura, apesar de se encontrar valores de h 2 baixos (abaixo de 0.2) e moderados para a característica Prod_ovos (entre 0,2 e 0,4), em boa parte dos estudos os valores de h 2 costumam ser de moderados a alto (acima de 0,4), tanto em estudos com produção de ovos por gaiola com mais de um animal (BISCARINI et al, 2010) como em estudos com produção de ovos individual BESBES, 2000;NURGIARTININGSH et al, 2004;SINGH et al, 2018).…”