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Genetic correlation between lactational maturity, fertility and lifetime productivity in Simmental cows



Genetic correlation between lactational maturity, fertility and lifetime productivity in Simmental cows



Tsitologia i Genetika 26(3): 48-52



Data on 1st-lactation, peak lactation and lifetime milk yields of Russian Simmental cows were analysed. "Lactational maturity" was defined as the 1st-lactation milk yield as a percentage of peak lactation yield. The genetic correlation of lactation maturity with productive lifespan in years was -0.45 (P>0.01). The genetic correlations between peak lactation milk yield and reproductive efficiency varied from 0.30 to -0.21 for groups of cows with different milk yield levels.

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