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STUDIUM VLIVŮ PŮSOBÍCÍCH V REPRODUKČNÍM PROCESU U PRASNIC SE ZVLÁŠTNÍM ZŘETELEM K PORODNÍMU OBDOBÍ
ZIMOLOVÁ, Barbora
The aim of the thesis was to reveal reserves for improving the piglets breeding and to reduce losses by death. The highest number of all (13.52 pcs) and live born (11.88 pcs) piglets were achieved in gilts embedded in more than 247 days of age. Gilts covered within 224 days of age showed the lowest average number of piglets born (13.13 pcs). Statistically, however, has not been demonstrated difference (p > 0.05) between age groups of gilts during the first recess in the number of piglets born. Effect of order of litter on litter size was found to be statistically highly significant (p < 0.01), especially between the first and third parturition. The highest number of born piglets was found on the third litter (14.95 pcs) and lowest in the first litter (13.3 pcs). Most live piglets born were at the second litter (14.03 pcs) and least live born piglets were found on the 5th and higher litter (11.57 pcs). Among the number of piglets born alive in the individual litters was also evaluated statistically highly significant difference (p < 0.01). In assessing the impact on the duration of labor litter size was found to be a higher number of piglets born at night on average by 0.33 piglet more, but the number of piglets born alive was found higher in childbirth during the day (childbirth with assist). During statistical evaluation was not demonstrabled difference between the number of all even in the case of piglets born alive in viewpoint of the time of birth. From the perspective of the impact of the length of the interval from weaning to sows on litter size was found to be a higher number of all (14.83 pcs) and live (12.79 pcs) piglets born of sows recessed for more than 6 days after weaning. From the viewpoint of the impact sequence of litter for childbirth was detected statistically detectable difference (p > 0.05). In each of the litters was observed an average of 75 % births through the day. When evaluating the number of live births, depending on the number of piglets, born piglets showed a statistically highly significant relationship (p < 0.01) with high tightness on dependence (R = 0.83). Between the number of all born piglets and born alive was found a direct correlation.
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