Phenotypic and Genetic Trends The results of the phenotypic trend calculation in the studied HF population clearly showed a decreasing trend in the AFC trait and an increasing trend in the MY trait ( Table 9 and Figure 1 and Figure 2 ).
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Relationship Between Age at First Calving and 305-Day Milk Yield in Hungarian Holstein-Friesian Cows: Trends and Genetic Parameters.
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When analyzing the relevant literature, it seems that AFC has shown a decreasing and MP an increasing trend in all dairy cattle breeds in the recent period [ 37 , 38 ].