Avaliação genética de caprinos da raça Saanen nascidos no Brasil de 1979 a 2009
Avaliação genética de caprinos da raça Saanen nascidos no Brasil de 1979 a 2009
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DOI：
10.1590/1678-6154
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发表时间：
2014-08
影响因子：
0.4
通讯作者：
T. A. Ferreira;I. G. Pereira;A. Gouveia;A. V. Pires;O. Facó;M. Farah;M. C. Pessoa;M. Guimarães
中科院分区：
文献类型：
--
作者：
T. A. Ferreira;I. G. Pereira;A. Gouveia;A. V. Pires;O. Facó;M. Farah;M. C. Pessoa;M. Guimarães
本研究的目的是评估 1979 年至 2009 年出生于巴西的萨能山羊形态特征和类型的遗传力、遗传和表型相关性以及遗传趋势。使用来自 1243 只山羊（197 只雄性和 1046 只雌性）的数据来估计以下性状的遗传参数和趋势：周长、体长、肩高、身高、宽度和臀长，以及主要性状定义动物的品种标准和能力（肩部和背线、四肢和足部、乳制品类型、身体容量、乳腺、前后连接、乳房质地、乳头和注释）。通过限制最大似然多特征分析来估计方差分量。通过按出生年份对平均育种值进行回归获得遗传趋势。形态和功能性状的遗传力估计范围为0.08至0.45，遗传相关性为-0.58至0.89，表型为-0.11至0.87。大多数性状的趋势是多年来略有下降，这表明动物之间存在加性遗传变异，但也表明所实施的选择是无效的。
The aim of this study was to estimate heritability, genetic and phenotypic correlations and genetic trends of morphological characteristics and type of Saanen goats born in Brazil from 1979 to 2009. Data from 1243 goats, 197 males and 1046 females were used to estimate genetic parameters and trends for the following traits: girth, body length, wither height, height, width and rump length, and the main traits that define the breed standard and ability of the animal (shoulder and topline, limbs and feet, dairy type, body capacity, mammary gland, linking front and rear, texture of the udder, teats and note). Variance components were estimated by Restricted Maximum Likelihood multi-trait analysis. Genetic trends were obtained by regression of mean breeding values by year of birth. The heritability estimates of morphological and functional traits ranged from 0.08 to 0.45, the genetic correlations from -0.58 to 0.89 and phenotypes from -0.11 to 0.87. The trend was a slight decline over the years for most traits, which shows the existence of additive genetic variability among animals, but it demonstrates that the selection practiced has been ineffective.