نتایج جستجو برای: Maternal effects

تعداد نتایج: 1631720  

Journal: :journal of livestock science and technologies 2013
m.s. mokhtari m. moradi shahrebabak h. moradi shahrebabk m. sadeghi

(co) variance components and genetic parameters for growth traits in arman sheep were estimated, using data collected during an 11-year period (1999-2010), by applying the restricted maximum likelihood (reml) procedure under univariate and bivariate animal models. the studied traits were body weight of lamb at birth (bw), body weight at 3 months of age as weaning weight (ww), body weight at 6 m...

Journal: :journal of agricultural science and technology 2011
sh. ghorbani m. a. kamali m. a. abbasi f. ghafori-kesbi

this study was conducted to investigate direct and maternal effects on some economic traits in north iranian native fowls. traits considered were body weight at 1 day of age (bw1), body weight at 8 weeks of age (bw8), body weight at 12 weeks of age (bw12), egg number (en) during the first 12 weeks of laying period, egg weight at 1st day of laying (ew1), mean egg weight at 28th, 30th and 32nd we...

Journal: :علوم دامی ایران 0
جواد احمدپناه دانش آموخته کارشناسی ارشد دانشکده کشاورزی، دانشگاه تربیت مدرس، تهران رسول واعظ ترشیزی دانشیار گروه علوم دامی، دانشکده کشاورزی، دانشگاه تربیت مدرس، تهران

in this study, the effect of maternal additive genetic and environment on body weight at 6 weeks (bwt6w), breast width (hbrs), carcass weight (carcwt), breast weight (brswt), blood hematocrit value (hem), residual feed intake (rfi), daily feed intake (dfi) and average daily gain (adg) were investigated in a commercial broiler dam line. with and without maternal effects, six different animal mod...

Journal: :مجله علوم کشاورزی ایران 0
ابوالقاسم سراج رسول واعظ ترشیزی اردشیر نجاتی جوارمی

maternal effects on body weight at 8 weeks of age (bw8w), egg weight (ew), egg number (en) and age at sexual maturity (asm) from 13 generations of mazandaran native fowl were investigated. the data were analyzed using restricted maximum likelihood procedures and animal model with dfreml software. with or without using maternal effects, six different animal models were fitted. likelihood ratio t...

Journal: :علوم دامی ایران 0
محمد نبی حسنی دانشجوی کارشناسی ارشد دانشکده کشاورزی دانشگاه شهید باهنر کرمان مسعود اسدی فوزی استادیار دانشکده کشاورزی دانشگاه شهید باهنر کرمان علی اسمعیلی زاده استادیار دانشکده کشاورزی دانشگاه شهید باهنر کرمان محمدرضا محمدآبادی استادیار دانشکده کشاورزی دانشگاه شهید باهنر کرمان

genetic analysis of growth traits including body weight recorded at birth (bwt), 3 (3bwt), 6 (6bwt), 9 (9bwt) and 12 (12bwt) months of age was carried out using 4107 records on raieni cashmere goats born from 206 sires and 1402 dams, during years 1992 to 2006. the records were collected from a resource flock in baft research station, situated in kerman province, iran. the importance of addition...

2000
Karin Meyer

Restricted Maximum Likelihood algorithm estimates of (co)variance components due to maternal effects as well as a regression on maternal phenotype were obtained for seven weaning weight data sets of Australian and New Zealand beef cattle. Fitting such regression, analyses accounted for environmental covariances between dams and their offspring. Results show a substantial, negative regression on...

Journal: :علوم دامی ایران 0
ابوالقاسم سراج دانشجوی دکتری دانشکده کشاورزی دانشگاه تربیت مدرس رسول واعظ ترشیزی استادیار دانشکده کشاورزی دانشگاه تربیت مدرس عباس پاکدل استادیار پردیس کشاورزی و منابع طبیعی دانشگاه تهران

influence of maternal and sire-generation interaction effects on day-old chick' weight was investigated in two commercial broiler sire and dam lines, and in mazandaran native fowls. the data were analysed through restricted maximum likelihood (reml) procedures, using asreml software. ten different animal models were implemented and compared with likelihood ratio test. all models consisted ...

Journal: :journal of livestock science and technologies 2013
a. rashidi

the objective of the current study was to estimate the genetic parameters for body weight traits at different ages in iran-black sheep. data collected during a 24-year period (1984-2008) on body weight were used to model the growth trajectory and estimate genetic parameters. studied traits were birth weight (bw), weaning weight at 3 months of age (ww), 6 months weight (6mw), 9 months weight (9m...

The objective of the current study was to estimate the genetic parameters for body weight traits at different ages in Iran-Black sheep. Data collected during a 24-year period (1984-2008) on body weight were used to model the growth trajectory and estimate genetic parameters. Studied traits were birth weight (BW), weaning weight at 3 months of age (WW), 6 months weight (6MW), 9 months weight (9M...

Journal: :journal of agricultural science and technology 2013
m. vatankhah

the data set employed in this study was comprised of a number of 6,800 records of lamb’s longevity and their survival rate, collected from 1989 through 2009, from the lori-bakhtiari experimental flock at the shooli station in shahrekord, iran. the data were analyzed using linear models and proportional hazard models with weibull function. these models included fixed factors and direct additive ...

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