A note on the fertility and some demographical parameters of Icelandic toelter horses |
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| Authors: | Kristinn Hugason Thorvaldur Arnason Jón V Jónmundsson |
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| Institution: | The Agricultural School, Hólar, IS-551 SaudárkrókurIceland;Swedish University of Agricultural Sciences, Department of Animal Breeding and Genetics, S-750 07 UppsalaSweden;The Agricultural College, Hvanneyri, IS-311 BorgarnesIceland |
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| Abstract: | Mating results of 5649 pairings taking place in the years 1978 and 1979 were analysed. The average fertility rate for 316 stallions was found to be 85.6%. On average, 17.9 mares were mated to each stallion during the breeding season. The overall fertility (conception) rate was estimated to 82.1%, the apparent fertility rate 81.1% and the numerical productivity rate 78.0%. The sex ratio for the newborn foals was found to be 52.5% males vs 47.5% females, which is significantly different from an equal ratio of the two sexes. The generation interval from parent's birth to birth of offspring, LPO, was estimated to be 9.7 years. The generation intervals for the four different paths were: LSS=8.6, LSD=8.7, LDS=11.4 and LDD=11.6. |
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