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首页> 外文期刊>Tropical Animal Health and Production >Phenotypic and genetic parameters for body weights and antibody response against Newcastle disease virus (NDV) vaccine for Kuchi chicken ecotype of Tanzania under extensive management
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Phenotypic and genetic parameters for body weights and antibody response against Newcastle disease virus (NDV) vaccine for Kuchi chicken ecotype of Tanzania under extensive management

机译：坦桑尼亚库奇鸡生态型体重的广泛表型和遗传参数以及针对新城疫病毒（NDV）疫苗的抗体反应

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摘要

This study was carried out to estimate phenotypic and genetic parameters for body weights and primary antibody response (Ab) against Newcastle diseases virus (NDV) vaccine for Kuchi chicken ecotype of Tanzania managed extensively. Body weight was evaluated at 8 (Bwt8), 12 (Bwt12), 16 (Bwt16) and 20 (Bwt20) weeks of age, while Ab against NDV vaccine was evaluated at 6 weeks of age (2 weeks post-vaccination). Number of birds per trait varied from 373 to 430. Mean value +/- standard error (SE) over both sexes for Bwt8, Bwt12, Bwt12 and Bwt20 were 348 +/- 2.8, 685 +/- 5.3 g, 974 +/- 6.4 g and 1,188 +/- 7.3 g, respectively. Mean Ab value (HI titre in log(2)) against NDV vaccine was 4.69 +/- 0.06. Heritability values +/- SE for Bwt8, Bwt12, Bwt16, Bwt20 and Ab against NDV vaccine were 0.30 +/- 0.13, 0.34 +/- 0.12, 0.37 +/- 0.11, 0.39 +/- 0.12 and 0.22 +/- 0.08, respectively. Genetic (r (g)) and phenotypic (r (p)) correlations were positive and high among body weights (i.e. r (g) = 0.53 to 0.74 and r (p) = 0.44 to 0.64), and were negative and low (i.e. around 0.10 and below) among Ab against NDV vaccine and body weights. Based on these estimates, it was concluded that growth performance for Kuchi chicken under extensive management is still poor. Adequate additive genetic variations exist for body weights and Ab against NDV vaccine under extensive management, thus they can be improved through selection under such environment, and further that both traits (body weight(s) and Ab) can be improved/selected simultaneously without significant reduction in genetic gain (response) for each trait.
机译：进行这项研究以评估表型和遗传参数的体重以及针对坦桑尼亚库奇鸡生态型的新城疫病毒（NDV）疫苗的一抗（Ab）疫苗的广泛管理。在8周龄（Bwt8），12周龄（Bwt12），16周龄（Bwt16）和20周龄（Bwt20）评估体重，而抗NDV疫苗的抗体在6周龄（接种疫苗后2周）评估。每个性状的禽鸟数量从373到430不等。Bwt8，Bwt12，Bwt12和Bwt20的两性平均值+/-标准误差（SE）为348 +/- 2.8、685 +/- 5.3 g，974 +/-分别为6.4克和1,188 +/- 7.3克。针对NDV疫苗的平均Ab值（log（2）中的HI滴度）为4.69 +/- 0.06。针对NDV疫苗的Bwt8，Bwt12，Bwt16，Bwt20和Ab的遗传力值+/- SE为0.30 +/- 0.13、0.34 +/- 0.12、0.37 +/- 0.11、0.39 +/- 0.12和0.22 +/- 0.08，分别。体重之间的遗传（r（g））和表型（r（p））相关呈正相关和较高（即r（g）= 0.53至0.74和r（p）= 0.44至0.64），而呈负相关且较低（即抗NDV疫苗抗体和体重的Ab中。根据这些估计，可以得出结论，在广泛管理下的库奇鸡的生长性能仍然很差。体重和抗NDV疫苗的抗体在广泛管理下存在足够的附加遗传变异，因此可以通过在这种环境下进行选择来改善它们，并且进一步可以同时改善/选择两个特征（体重和抗体）而无显着差异每个特征的遗传增益（响应）降低。

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