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In 1965 performance testing was initiated in Finland for the selection of boars for A.I. use. In 1965—68 a total of 147 boars were tested on four local testing stations) The following average results were recorded: backfat thickness 21.6 mm (at a live weight of 88 kg), growth rate 699 g/day, feed efficiency 2.69 scand. fu/kg growth and testing score (growth + fat) 99.6. The average testing score for boards selected for A.I. use (43 % of tested) was 99.7. Weakness of the legs was noted in 21 % of the boars. The varying initial weights of the male piglets influenced the growth rate very markedly (P < 0.001), and the effect of the initial age was significant with respect to feedefficiency (P < 0.01). The influence of the weight and age at end of test was highly significant with regard to thickness of fat (P < 0.001). Moreover, the weight at end of test affected the testing score significantly (P < 0.001), but the effect of age was eliminated byuse of correction factors. The years as well as the testing stations influenced most of the results in a significant manner. The thickness of fat for the Yorkshire boars was significantly greater (P < 0.01) than for the Landracc boars and the former also had a significantly lower testing score. The effect of the genetic variation, influence of sires within breeds, was highly significant (P < 0.001) for all test results. It has thus proved possible to estimate the genetic quality of the boars. The different influences on the test results were analyzed by least squares procedures. Value of performance test in revealing breeding value of boars Due to the ultrasonic technique the performance test has become important when selecting pigs for breeding. Kirsch et al. (1962) reached the conclusion that when heritability exceeds 0.25, performance testing is preferable to progeny testing. According to the calculations of Johnsson (1968) at least 4 litter groups (16 piglets) are required before the progeny test gives the same result as the performance test. In the opinion of Standal (1968) the performance test can succesfully be used also with respect to characters which can not be measured on live animals, but are strongly correlated to the characters under test.

The performance testing of boars I. Performance testing on Finnish experimental stations and genetic and environmental influences on test results