Components of Variance for Milk and Fat Yields in Dairy Goats
نویسندگان
چکیده
منابع مشابه
Evaluation of Various Approaches in Prediction of Daily and Lactation Yields of Milk and Fat Using Statistical Models in Iranian Primiparous Holstein Dairy Cows
In this research, 272977 test day records collected from 659 herds during years 2001 to 2011 by the Iranian animal breeding center were used. In the first section the ability of different models to predict daily milk yield from alternative milk recording was tested. The result showed that a complex model including noon milking time plus the effect of lactation curve of Ali and Schaeffer functio...
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Heritabilities for milk, fat, and protein yields were estimated from first lactation data used for USDA-Dairy Herd Improvement Association (DHIA) genetic evaluations. Contemporary group assignments and standard deviations within herd-year were determined with the procedure used for national evaluations. Pedigree data were included for animals born since 1970; yield data were included for cows b...
متن کاملan estimation of genetic parameters and trends for milk and fat yields and fat percentage for holstein dairy cattle in khorasan province using univariate and repeatability animal models
genetic parameters and trends for milk and fat yields as well as for fat percentage were estimated from 35,438 milk production records (305d, 2x) of 17,971 holstein dairy cattle in 133 herds during the period of 1990-2003 in khorasan province. variance components were estimated using restricted maximum likelihood statistical method applying univariate and repeatability animal models. for the un...
متن کاملThe effects of galanin on the mean plasma concentrations of growth hormone, Triiodothyronine, thyroxine and milk fat in dairy goats sannan
This study investigated the effects of five levels of galanin on plasma concentrations of growth hormone , Triiodothyronine, thyroxine and milk fat in dairy goat breed was sannan .15 breeds of dairy goats sannan all about the same age and weight were selected for this study and were randomly divided into five treatments ( three replicates per treatment ). Levels of the hormone injection of gala...
متن کاملThe effects of galanin on the mean plasma concentrations of growth hormone, Triiodothyronine, thyroxine and milk fat in dairy goats sannan
This study investigated the effects of five levels of galanin on plasma concentrations of growth hormone , Triiodothyronine, thyroxine and milk fat in dairy goat breed was sannan .15 breeds of dairy goats sannan all about the same age and weight were selected for this study and were randomly divided into five treatments ( three replicates per treatment ). Levels of the hormone injection of gala...
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ژورنال
عنوان ژورنال: Journal of Dairy Science
سال: 1981
ISSN: 0022-0302
DOI: 10.3168/jds.s0022-0302(81)82844-5