an estimation of the genetic, phenotypic and environmental trends for as related to growth traits, and pelt score in karakul sheep

Authors

سعید حسنی

استادیار دانشگاه علوم کشاورزی و منابع طبیعی گرگان امید امام وردی

دانشجوی سابق کارشناسی ارشد دانشگاه علوم کشاورزی و منابع طبیعی گرگان سعید زره داران

استادیار دانشگاه علوم کشاورزی و منابع طبیعی گرگان مجتبی آهنی آذری

استادیار دانشگاه علوم کشاورزی و منابع طبیعی گرگان همایون فرهنگ فر

abstract

thriteen thousand, seven hundred and fifty two (13752) records on growth tarits (birth weight, 1, 3, 6, 9 and 12 month weights) as well as pelt scores, collected during 1996-2002 as karakul sheep breeding station, sarakhs, iran were employed in this study. best liner unbiased prediction (blup) of breeding values, genetic and phenotypic trends of the traits were estimated as the regression of average predicted breeding values and phenotypic values over birth year, respectively. environmental trends were assessed as the difference between phenotypic and genetic trends. estimates of genetic trends were found as: 0.013±0.001, 0.034±0.004, 0.119±0.010, 0.087±0.013, 0.127±0.018, 0.119±0.019 kg/year and 0.257±0.019 score/year, respectively. phenotypic trend for the above traits were -0.151±0.005, -0.116±0.023, 0.268±0.035, 0.185±0.052, 0.443±0.065, 0.559±0.078 kg/year and -0.235±0.048 score/year, respectively. environmental trend for the same traits were respectively estimated as -0.164±0.004, -0.151±0.019, 0.149±0.025, 0.098±0.039, 0.316±0.047, 0.440±0.059 kg/year, and -0.492±0.029 score/year.

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Journal title:
علوم دامی ایران

جلد ۴۱، شماره ۴، صفحات ۳۴۳-۳۴۹

Keywords
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