Som factors affecting herdlife lactating days and herdlife dry days in Holstein cows
journal of kerbala university,
2007, Volume 3, Issue 4, Pages 109-113
AbstractRecords of 946 Holstein cattle culled during years from 1998 to 2004 at the Nasr Dairy Cattle Station, United Company for Animal Resources Ltd., Al-Soueira were analysed using general linear model within the SAS program to study some fixed factors (season and year of birth , age at first calving and first milk yield ) on herdlife hactating days and herdlife dry days ,we found that all factors have a significant effect ( P < 0.01 ) on lactating days whereas only year of birth was significant on dry days .The overall means for herdlife lactating days and herdlife dry days 1187.02 , 333.42 days respectively. The heritability of herdlife lactating days and dry days using MIVIQUE method were 0.11 , 0.09 respectively.
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