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Analýza parametrů reprodukce prasnic ve vybraném chovu
HLATKÁ, Tereza
The aim of the thesis was to analyze the influences affecting the fertility of sows (number of piglets/1 litter) in the monitored breeding from the period 2017 to 2023. The highest number of piglets was in 2023, with a total of 15.89 born, out of which 13.53 were born alive (a difference of 2.36 piglets). The lowest number of piglets was in 2017, with 13.78 born in total, out of which 12.34 were born alive. Within the genotype, the highest number of piglets was recorded in the landrace breed sows, with a total of 15.05 born and 13.52 born alive. Conversely, in the duroc breed, the number of born piglets was 10.88 in total, with 9.35 born alive. There was a consistent difference of 4.17 piglets (P<0.05) between the two breeds in both total and alive births. For hybrid sows of genotype YL and (YL)D, there was a difference of 0.88 piglets (P<0.05) in total born and 0.67 (P<0.05) in alive born. The lowest number of total born piglets (14.04) and alive born piglets (12.81) were born to sows in their 1st and 2nd litter. Sows in their 3rd-5th litter showed the most total born piglets (15.25) and alive born piglets (13.48). From the 6th litter onwards, there was a downward trend in the number of piglets, with a significant drop observed in alive born, by 0.55 piglets (P<0.05). Sows inseminated at 250 days old had a litter frequency of 13.12 total born piglets and 12.09 alive born piglets. Sows inseminated at 251 days old had a litter frequency of 14.37 total born piglets and 13.13 alive born piglets, with a difference of 1.25 total born and 1.04 alive born. With the prolongation of sow gestation length, there was a slight decrease in both total and alive born piglets. Sows with a farrowing interval 147 days had a higher number of total born piglets (15.34). With an interval 148 days, the number of total born piglets was 0.48 lower (P<0.05). The same trend was observed for alive born piglets, with a difference of 0.37 (P<0.05) between sow groups. Sows with an interval from weaning to insemination 4 days achieved a higher number of total born piglets (15.31) compared to sows with an interval 5 days (14.88), with a difference of 0.43 piglets. The same trend was observed for alive born piglets, with a difference of 0.34 piglets.
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