Genetic and Phenotypic Relationships in Japanese Quail.

Abstract

Live BW, carcass data, and organ data taken at 34 days of age on approximately 1,000 quail of both sexes from 110 sires and 290 dams were utilized to estimate genetic parameters from the initial generation of a selection study. The birds represented a sample of a line selected for high 4-wk BW. Data were analyzed using Henderson's Method 3 (MM3) and restricted maximum likelihood (REML) with and without a relationship matrix. The paternal half-sib heritabilities for body, carcass, and organ weights in Japanese quail were moderate to high for most traits studied, suggesting that selection to increase or decrease these traits should be successful. With the exception of BW, abdominal fat (AF), and heart weights, maternal half-sib heritability estimates were smaller than paternal half-sib estimates. Heritability estimates of traits adjusted for BW tended to be lower than counterparts not adjusted for BW. The genetic correlations of BW with the other carcass measurements were positive, and tended to be moderate to high. The correlation of BW with AF was .34, suggesting that selection for increased BW alone will lead to a bird with more abdominal fat. The correlations of AF with the other traits tended to be low to moderate in magnitude, with three of the correlations being negative, suggesting correlated responses with other traits when selecting for increased or decreased AF would be small. Genetic correlations among various muscle measurements were all positive and most were high in magnitude, indicating that traits easiest to measure and collect can be used in a selection process. The genetic correlations among the organ measurements were positive and moderate as were the correlations of organ weights with muscle weights. Negative genetic correlation estimates between AF and muscle measures were obtained from analysis when BW was a covariate. The REML heritability estimates were higher than MM3 estimates and REML genetic correlation estimates were less extreme than MM3.

Estimation of Additive and Non-Additive Genetic Variances of Body Weight, Egg Weight and Egg Production for Quails (Coturnix coturnix japonica) with an Animal Model Analysis

“…In general, the heritability values of the four body weight traits are higher for line 2 than for line 1. The estimated heritability of the body weight of the Japanese quail at different ages was reported, for example, by STRONG et al (1978), TOELLE et al (1991), BRAH et al (2001), SAATCI et al (2003, VALI et al (2005) andRESENDE et al (2005). These studies normally used body weights at different ages and often used different methods to estimate the heritability.…”

“…These studies normally used body weights at different ages and often used different methods to estimate the heritability. TOELLE et al (1991) used the simple full-sib analysis for their heritability estimates of the body weight from sire and dam components and reported values between 0.49 and 0.70. BRAH et al (2001) analysed data from 9 generations of two selected quail lines.…”

Japon Bıldırcınlarında (Coturnix coturnix japonica) Canlı Ağırlığa Ait Genetik Parametrelerin Şansa Bağlı Regresyon Modeli Kullanılarak Tahmin Edilmesi

“…Bıldırcın generasyonlar arası süresinin kısalı-ğı, seleksiyonun etkilerinin kısa sürede alınabilmesi, genetik ıslah çalışmalarına uygunluğu, birim alanda fazla hayvan bulundurulması, kolayca yetiştirilebilmesi, hastalıklara karşı diğer kanatlı çiftlik hayvanların göre daha dayanıklı olması, az yem tüketmesi ve kısa sürede eşeysel olgunluğa ulaşma-sı gibi nedenlerle kanatlı hayvan yetiştiriciliğinde deney hayvanı olarak önem kazanmıştır [1][2][3][4][5][6] . Büyüme ile ilgili özelliklere ait genetik parametrelerin tahmini, çiftlik hayvanları ve Japon bıldırcınları için oldukça önemlidir.…”

“…Saatçi ve ark. 8 tarafından Japon bıldırcınları kullanılarak yapılan bir 2 olmuştur. Bu durum, ilk dönemlerde bireylerin canlı ağır-lıkları arasında görülen farklılıkta çevresel faktörlerin payının oransal olarak daha yüksek olduğunu akla getirmektedir ki bu da kalıtım derecesinin düşük olması anlamına gelir.…”

DESEMPENHO PRODUTIVO DE QUATRO GRUPOS GENÉTICOS DE CODORNAS (Coturnix sp.) PARA CORTE

“…Desempenho produtivo de quatro grupos genéticos de codornas (Cotumix sp.) para corte Presumia-se isso, uma vez que é conhecido o dimorfismo sexual nas codornas domésticas (TOELLE et al, 1991) que faz com que as fêmeas sejam de 5 a 20% mais pesadas do que os machos de mesma idade, dependendo das linhagens e idades comparadas (MINVIELLE et al, 1999). Esta diferença surge entre 21 e 28 dias, com a proximidade da maturidade sexual, que ocorre por volta dos 42 dias de vida, e acentua-se até à idade adulta, sendo devida, principalmente, ao maior peso do fígado e trato reprodutivo das fêmeas (OGUZ et al, 1996).…”