The reproduction parameters, such as number of mares mated per sire, foaling rate, reproductive life and generation interval, were analysed. The records from the years 1978 to 1991 were obtained from the Hanoverian 111 “ “ penod 189 006 matings were registered. They resulted 109.105 foalings, wherein the foals born in 1992 were considered. 45.4 % stallions were mated with less than 10 mares. On an average the stallions were kept for 4.0 years for breeding and mated with 30 mares (s= 35) per season. The mean value of stallions mated with less then 10 mares per year was 41.9 %. The average foaling rate was 57.7 %. The foaling rate per year increased with increased artificial insemination practise. In 1990 more than 61 % foalings were observed. The reproductive hfe of the mares bom m 1977 was analysed. The average reproductive life of such mares was 4.6 years with 2.7 foals bom within the span of 14 years. The generation intervals for dam-daughter dam-son sirejiaughter and sire-son were Ldd= 9.1, Lds= 9.2, Lsd= 10.7 and Lss= 10.7 years for each respective path (s= . .8). In the penod between the years 1979 to 1992, the generation interval continuously increased from 8 8 to 9.6 years in case of mares.

H. Uphaus, E. Kalm

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 17. Genetics and breeding of dairy and beef cattle, swine and horses, , 475–478, 1994
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