Abstract

The purpose of this study was to analyse traits describing the lifetime performance and herd' life of FI cows originating from the FAO trial. The data were 7,353 cows, daughters of 379 bulls from 10 strains, with an average of 3.8 lactations per cow. Heritabi1ities of lifetime production of milk and fat, and measures of length of productive life were low, between 0.031 and 0.069. Milk and fat production per day of productive life had heritabilities of 0.222 and 0.188, respectively. The ranking of strains based on mixed model solutions for herd life traits showed the superiority of the US, Canadian, New Zealand and Israeli strains. In lifetime milk yield the USA, Canada and Israel were highest, followed by New Zealand. In lifetime fat yield two North American strains remained highest, but New Zealand outproduced Israel. In all traits analysed, the Netherlands and Poland ranked last, and the other European strains filled the middle ranks

Z. Zarnecki, H. D Norman, J. Jamrozik

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XIV. Dairy cattle genetics and breeding, adaptation and conservation., , 70–73, 1990
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