[ 60 ] found a positive trend in EBV 19 and 18.97 kg/year for the first lactation milk yield in South African Ayrshire and Holstein cattle, respectively.
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Effects of season and age at first calving on genetic and phenotypic characteristics of lactation curve parameters in Holstein cows.
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The sentences
There was an increasing trend for peak yield from 2002 to 2011 but for peak time the maximum EBVs was obtained in 2006 and the fluctuation of EBVs in this trait is higher than that of peak yield.