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The article presents the results of scientific research on determining the level of stress resistance in piglets of Danish origin, weaned from sows at the age of 28 days. According to the results of the variation series of the live weight test of piglets, the modal class included the II group of weakly responsive animals, which had a stress resistance criterion within ±0.67 sigma, relative to the individual arithmetic mean values of the sample for this indicator; the III group of highly responsive animals – by -0.67 sigma in the direction of decrease and the I group of resistant animals – by +0.67 sigma in the direction of increase. The obtained experimental data indicate that within the normalized distribution of the total livestock, the maximum number of young animals was found to be weakly responsive (group II) to the stress factor (51 animals or 56.7%), the resistant type (group I) is characteristic of a group of animals of 28 animals or 31.1%, while 11 animals or 12.2% were included in the group of highly responsive piglets (group III).

Analyzing the results of the studies, it can be stated that the growth energy of young animals of group M⁺ for the period from weaning from mothers to the end of the growing-up period was quite high, compared to peers of groups M⁰ and M^– by 62.0 g or 13.9% (p<0.05) and 87 g or 20.6% (p<0.01). At the age of 6 months, the growth rate of the young animals of the M⁺ group began to increase again and they exceeded the piglets from the M⁰ group by 44.0 g or 5.6% (p<0.05) and individuals from the M^– group by 81.0 g or 10.7% (p<0.01). The improvement of the adaptive capacity to the stress factor in the M⁺ group of piglets was also accompanied by a significant increase in the average daily gain over the entire growing period by 39.0 g or 6.3% (p<0.05) and 67.0 g or 11.3% (p<0.01) compared to the young animals from the other groups.

Subsequently, the evaluated young animals were distributed by types of higher nervous activity. The highest level of strength of nervous processes, balance of excitation and inhibition processes, and their mobility were observed in piglets that had a strong balanced mobile type of nervous activity with a high statistical difference of p<0.001 in all cases of comparison with the group identified as weak.

 

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