The effect of paragenetic factors on longevity traits of Simmental cows | Uticaj paragenetskih faktora na osobine dugovecnosti krava Simentalske rase
2004
Petrovic, M.D., Poljoprivredni fakultet, Beograd - Zemun (Serbia) | Skalicki, Z., Poljoprivredni fakultet, Beograd - Zemun (Serbia) | Gutic, M., Agronomski fakultet, Cacak (Serbia) | Bogdanovic, V., Poljoprivredni fakultet, Beograd - Zemun (Serbia)
The effect of paragenetic factors on longevity traits was onvestigated in Simmental cows housed at the Zlatiborski Suvati farm, Serbia. The effect of the lactation number, the calving season and the age at first insemination on longevity traits such as the age at culling, the length of productive life, the total number of milking days and the utilization index was examined. The general average, according to the model for the age at culling, the length of productive life, the total number of milking days and the utilization index was 3496.31 days, 2637.14 days, 2000.43 days and 72,42%, respectively. The effect of the total number of lactations on all the longevity traits was very highly significant (P is less than 0.001), whereas the calving season statistically very significantly affected only the age at culling (P is less 0.01). The age at the first insemination had a very highly significant effect on the age at culling and the cow utilization index (P is less than 0.001).
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