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Title of the paper: <b>The influence of the age of first calving on fertility and Performance in dairy cows</b> The influence of the age of first calving (respectively heifer conception age) on later fertility was investigatedaccording to the lactation reports of 8 German herds (n = 4125), one US-American (n = 300) herd as well as tothe annual average data of 206 Israeli herds.  All the correlation coefficients were set nearly zero. The optimal sphare for the age of first calving regardingsome milk performance characteristics is from 24–26 months. This can be infeired from the variance analysesfrom the comparisons among the groups.  The analysis of 1032 heifer births showed a rising tendency in the frequency of dystocias in higher age of firstcalving

Einfluß des Erstkalbealters auf Fruchtbarkeit und Leistung bei Milchkühen