Effect of genetic and non-genetic factors on productive traits of Friesian cows in the middle of Iraq
journal of kerbala university,
2007, Volume 3, Issue 4, Pages 222-225
AbstractThis study includes 630 records of milk production for lactation length and dry period between 2001-2005, belong to 123 Friesian cows in Al-nasr diary cattle station. This study deals with genetic factor (spotting) and non-genetic factor (parity, calving season and calving year). General linear model (GLM) method is used for statistic analysis system (SAS) program is performed to estimate the fixed factors effect (spotting, parity, calving season and calving year). The Restricted Maximum Likelihood (REML) method is adopted for variance components of the random effects by assuming the mixed model.General average of lactation length and dry period was (323.65 and 71.06) days respectively .The spotting is significant effect (p<0.01) on the lactation length but no significant effect on dry period . Both of calving season and calving year were effect significantly (p<0.01)on lactation length but the parity has no significant effect (p<0.01) on both lactation length and dry period .
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