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by
R. Yaeghoobi |
Total Records (
2 ) for
R. Yaeghoobi |
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R. Yaeghoobi
,
A. Doosti
,
A.M. Noorian
and
A.M. Bahrami
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Investigation of genetic parameters and trend of milk and fat yield traits is main goal of this study. This study used 2213 records of first lactation Holstein's dairy cattle of west provinces of Iran for estimate of genetic and phonotype trend. These data get from Animal Breeding Center from 1996-2006 then analyzed. Annual Genetic and phonotype trend for milk and fat yield traits was 19.61, 0.171, 71.99 and 1.401, respectively. Estimation of the variance-covariance traits and hereditability of the traits of milk production and the milk fat content were made using the single trait animal model and the DFREML software. Heritability of milk and fat yield was 21.02±0.06 and 0.086±0.005, respectively. The components of variance additive genetic, phonotypic and error were 505272.69, 2403771.14 and 1806194.70 for milk yield and 185.84, 2256.74 and 2160.98 for fat yield, respectively. |
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R. Yaeghoobi
,
H. Roshanfekr
,
M. Mamooee
,
J. Fayazi
,
A. Ashayerizadeh
,
M. Bojarpour
and
M.T. Beigi Nasiri
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This study was carried for investigation interaction between genotype and environment for milk and fat production traits of Holstein cattle in western provinces of Iran. In this study, used 2213 records of first lactation Holstein dairy cattle in this zone of Iran. These data get from Iranian Animal Breeding Center from 1996-2006. The edited sets include 2213 first lactation for milk and fat. Records were divided in two climates. Heritability estimates using REML method and derivative-free algorithm for milk and fat yield in semidry climate and Mediterranean climate 0.2014±0.06 and 0.2468±0.03, respectively. For estimation of Genetic correlation were used from multivariate animal model. Genetic correlation was -0.04 and 0.013 for milk yield and fat yield, respectively. EBVes correlation mean was -0.019 and 0.031 for proofs between climate for milk and fat traits, respectively. Low genetic correlation and EBVes correlation for milk and fat traits between climates Indicate to proofs have not same difference performance in both climates. In addition, Germany Sperms cause increase milk and fat yield in both climate and Iranian and American Sperms decrease milk and fat yield in both climate. |
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