The effect of year on phenotypic variability of performance traits of boars tested at the Central Test Station | Uticaj godine na fenotipsku varijabilnost proizvodnih osobina nerastova tretiranih u centralnoj testnoj stanici
2006
Mijatovic, M., Poljoprivredni fakultet, Beograd - Zemun (Serbia) | Petrovic, M., Poljoprivredni fakultet, Beograd - Zemun (Serbia) | Radojkovic, D., Poljoprivredni fakultet, Beograd - Zemun (Serbia) | Pusic, M., Institut za primenu nauke u poljoprivredi, Beograd (Serbia)
The investigations were carried out over a seven year period (from 1995 to 2001) in the Station for Testing of Production Capacieties of Swine at the Agricultural Corporation Beograd in Padinska Skela (Serbia). The examination included a total of 738 tested animals of following breeds: Swedish Landrace, Large White and Hampshire. All three breeds were analyzed togheter because number of tested boars of Swedish Landrace and Hampshire breed was too small in comparison to Large White breed. The least squares method was used to test the significance of the effects of year on variability of production traits. Test of significance showed that year at the start of the test influenced (P is less than 0.001) all feed efficiency traits and all growth traits except test duration and average daily gain. The body composition traits were significantly influenced (P is less than 0.01 and P is less than 0.001) by year except muscle depth. However, it was not expected that the body weight at the start of the test and the end of the test was influenced (P is less than 0.05 and P is less than 0.001) by year at the start of the test. The weight at the start and at the end of the test must stay within strict limits proposed by testing rules. These investigation showed that effect of the year should be included in the models that are used to estimate of phenotypic and genetic parameters which are needed for the genetic evaluation of boars tested under conditions of the central station.
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