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INDICATORS OF GILT DIRECT TEST

Ivan Gajić ; Poljoprivredni fakultet Beograd, Srbija
Dragan Fidler ; Institut za kukuruz, Zemun-polje, Srbija


Puni tekst: hrvatski pdf 1.836 Kb

str. 351-359

preuzimanja: 150

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Sažetak

Bredding value is established for both sexes of animals. In order to find it out control data are used. Values of gilt direct test are most often used. Despite relative application of this procedure the analysis of obtained values is not complete in all cases, so that maximum contribution is not achieved. The fact that crossbreeding is applied more and more entails the neressity of indicators comparison between crossbreds of generation F1 and gilts of purebred Swedish Landrace. For the necessities of these investigations the data of two two groups' gilt direct test were used, i.e. of Swedish Landrace and crossbreds (Swedish Landrace + Large White). The test was performed simultaneously for both groups. Each group had 256 gilts. The following traits were included: body weight at the end of the test (x1); age at the end of the test (x2); average daily gain (x3); average backfat thicknes (x4). Data processing is based on calculating mean values (x) of variation measures (o²; s‾x; o⁻; Cv ; Xmin.; Xmax; d-distance; Me; 0.25Q; 0.75Q; D-distane i C.I.+onfidence interval). In order to establish behaviour control values were calculated for asymmetry (As) and flatness (Ku) and testing was done by means of khi-test for normality and exponentiality.
The analysis provides the establishmet of differences in indicators between two groups of gilts which result from genotype effect. Values are higher in gilt-crossbreds sample but variance is better expressed. Asymmetry of showing trait is better as well as of flatness for crossbreds group in relation to sample values of purebred gilts of Swedish Landrace. Khi-test for normality and exponentiality of empirical curves in relation to theoretical ones indicate that differences are insignificant for total body weight at the end of the test (1st group - crossbreds) and average backfat thickness (2nd group - purebred gilts) so that hypothesis of normality in sample distribution is accepted with these cases. It has been found that traits show differently which certainly influences the interpretation of the obtained results. That is why a different aproach is required in the choice of processing treatments depending on the nature of traits.

Ključne riječi

Hrčak ID:

162093

URI

https://hrcak.srce.hr/162093

Datum izdavanja:

23.1.1991.

Podaci na drugim jezicima: hrvatski

Posjeta: 541 *