نتایج جستجو برای: phenotypic trend reduction of fat

تعداد نتایج: 21209270  

2011
Navid Ghavi Hossein-Zadeh

Calving records from the Animal Breeding Center of Iran collected from January 1990 to December 2007 and comprising 207 106 first calving events of Holsteins from 2 506 herds were analysed using linear sire models to estimate genetic trends for age at first calving (AFC) and milk traits. Genetic trends were obtained by regressing yearly mean estimates of breeding values on year of birth. In gen...

Journal: :علوم دامی ایران 0
محمد صاحب هنر محمد مرادی شهربابک سیدرضا میرائی آشتیانی محمدباقر صیادنژاد

genetic trend for production traits were estimated in iranian holstein cattle using the first lactation data recorded by cattle breeding and dairy product improvement center of the state from 1991 to 2006. effect of some factors on genetic trend was investigated using data from 18 large herds. (co) variance components and genetic parameters were estimated, using five trait animal model and em-a...

Journal: :پژوهش های علوم دامی ایران 0
محمد جبارزاده ایوریق مراد پاشا اسکندری نسب فاطمه پوربایرامیان حسن خانزاده

introduction productive traits such as milk production and fat and protein percentage have economic importance in the livestock industry. accurate prediction of breeding value of animals is one of the best tools available for maximizing response to selection program. it is a fact that the main objective of the breeding program, is to achieve the maximum economic benefit. for breeders of dairy c...

Journal: :علوم دامی ایران 0
مختارعلی عباسی دانشیار پژوهش مؤسسۀ تحقیقات علوم دامی کشور

in order to study on the effect of incomplete sire's pedigree on the prediction of breeding value and estimation of genetic trend, two quantitative traits such as weaning weight and average daily gain with heritabilities 0.15 and 0.30 were simulated. phenotypic, genetic and environmental correlations were assumed 0.5. resulted data files with different proportion of missed sire pedigree (0...

2016
John Holmes Jamie Brown Petra Meier Emma Beard Susan Michie Penny Buykx

OBJECTIVES To evaluate short-term effects of publishing revised lower risk national drinking guidelines on related awareness and knowledge. To examine where drinkers heard about guidelines over the same period. DESIGN Trend analysis of the Alcohol Toolkit Study, a monthly repeat cross-sectional national survey. SETTING England, November 2015 to May 2016. PARTICIPANTS A total of 11 845 adu...

Journal: :پژوهش های علوم دامی ایران 0
مهدی نافذ سعید زره داران سعید حسنی رحمت سمیعی

in the present study, to estimate genetic parameters and genetic and phenotypic trends in holstein dairy cows in the north of iran, the records from first lactation of 11398 collected from 1989 to 2006 were used. records were collected from 290 herds. productive traits were 305 day-2x adjusted milk and fat yield and reproductive traits were age at first calving, calving interval and dry days. g...

Journal: :علوم دامی ایران 0
حسین مهربان دکتری ژنتیک و اصلاح نژاد دام، گروه علوم دامی، دانشگاه شهرکرد سید مهدی اسماعیلی فرد دانشجوی دکتری ژنتیک و اصلاح نژاد دام، گروه علوم دامی، دانشگاه علوم کشاورزی و منابع طبیعی ساری مجتبی نجفی دانشجوی دکتری ژنتیک و اصلاح نژاد دام، گروه علوم دامی، علوم کشاورزی و منابع طبیعی ساری بیتا عباسی مشائی دانشجوی دکتری ژنتیک و اصلاح نژاد دام، گروه علوم دامی، علوم کشاورزی و منابع طبیعی ساری ابراهیم اسدی خشوئی دکتری ژنتیک و اصلاح نژاد دام، گروه علوم دامی، دانشگاه شهرکرد

a data file containing 607662 (317608) milk (open days) records belonging 294417 (177838) holstein cows that were calved from 1983 to 2008 was used. the bivariate repeatability model was used for data analyzing so that herd, calving year, calving month, days in milk (only for milk trait) and calving age for each parity, were assumed as fixed effects and additive genetics and permanent environme...

Journal: :علوم دامی ایران 0
پویا زمانی دانشیار گروه علوم دامی، دانشگاه بوعلی سینا، همدان سیده عطیه طهایی دانش آموخته کارشناسی ارشد گروه علوم دامی، دانشگاه آزاد اسلامی، واحد ساوه علی قاضی خانی استادیار گروه علوم دامی، دانشگاه آزاد اسلامی، واحد ساوه مهدی جسوری دانشجوی دکتری گروه علوم دامی، دانشگاه بوعلی سینا، همدان

the present study was conducted to estimate genetic parameters and genetic, environmental and phenotypic trends of milk production traits in holstein cattle of hamedan province. in this study 11986 305-d records of first three parities of hamedan province holstein cattle, which were gathered during 1990-2011, were used. variance-covariance components and breeding values were estimated using ani...

Journal: :علوم دامی ایران 0
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 دانشیار دانشکده کشاورزی، دانشگاه بیرجند

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 av...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تبریز - دانشکده شیمی 1392

in the present work, a simple and sensitive method was developed for determination of morphine and heroin using gold nanoparticles as resonance rayleigh scattering (rrs) and colorimetric technique’s probe. synthesized gold nanoparticles by sodium citrate reduction method have a negative charge layer on their surfaces because of self-assembled citrate anions on their surface. binding of morphin...

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