Impact of porcine epidemic diarrhea virus infection at different periods of pregnancy on subsequent reproductive performance in gilts and sows

Section: Resultsmentioning

confidence: 93%

“…Damgaard et al (2003) piont out that litter size aff ects survival of piglets a er birth. Olanratmanee et al (2010) report 12.10 born piglets per a litter from sows in good hygienic conditions against 11.70 from sows in poor hygienic conditions, which indicates the need of breeding sows in good health status.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of selected reproductive parametres in gilts and loss of piglets after repopulation

Nevrkla¹,

Čechová²,

Hadaš³

2013

“…Von der Lage and Hoy (2008) analysed reproductive performance in sows in repopulated herds on five farms and found increased reproductive parameters in sows of the repopulated herds and maintenance of high health status usually for several years when strict rules were followed. Olanratmanee et al (2010) observed increased performance parameters in sows in good hygienic conditions, which highlights the necessity to keep the basic herd of sows in high health status. Results of our experiment document that the highest performance was achieved in sows at the 3 rd parity and it decreased later, which corresponds to the results published by Simmins et al (1993) who observed increasing fertility till the 3 rd to the 4 th parity with subsequent continuous decrease.…”

Section: Resultsmentioning

confidence: 97%

“…Decisive factors are age or weight of a sow. Also Olanratmanee et al (2010) state that fertility reaches its top level at the fourth parity and later it gradually decreases. Todd (2006) reported that the number of live-born piglets was the lowest in the first litter, then it increased up to the 4 th to 5 th parity, later its level stabilized before it started to decrease around 7 th to 8 th litter.…”

Section: Introductionmentioning

confidence: 99%

Effect of Minimal Disease in a Herd on Reproductive Parameters of Sows

Nevrkla¹,

Hadaš²,

Horký³

2017

The aim of this study was evaluation of reproductive performance in sows from herds with minimal disease. Total number of 40 sows were included in the observation and evaluated from the 1 st to the 4 th parity. The highest reproductive performance was recorded at the 3 rd parity. Statistically significant difference (P < 0.05) was found between the 1 st and the 3 rd parity and highly statistically significant difference (P < 0.01) was recorded between the 2 nd and the 3 rd parity in number of live-born piglets. Comparison of numbers of stillborn piglets showed statistically significant difference (P < 0.05) between the mean values of the 1 st and the 4 th parity. The results also showed highly statistically significant difference (P < 0.01) in number of reared piglets between the 3 rd and the 4 th parity. The conclusions of this study indicate that creation and maintenance of herds of sows with high health status lead to excellent results in the area of pig reproduction.

“…Similar trend was observed also in the genotype II, however without statistical significance of the correlation between the number of live-born piglets and the losses of piglets before weaning. Olanratmanee et al (2010) described a highly significant correlation between the total number of piglets and the number of live-born piglets. Škorjanc et al (2007) reported a positive correlation (r = 0.815) with a highly statistically significant dependence (P ≤ 0.01) between the number of live-born piglets and the number of reared piglets.…”

Section: Methodsmentioning

confidence: 99%

Effect of Genotype and Sex of Piglets on Their Losses Before Weaning

Nevrkla

Hadaš

Horký

et al. 2017

The aim of the experiment was to analyze selected reproductive characteristics in sows and losses of piglets according to their age and to evaluate the effect of sex on survivability of piglets before weaning. The experimental observation involved 80 sows with their second litters (40 sows of genotye I and 40 sows of genotype II). The sows were mated with a boar of Danish Duroc. No significant difference was found between the evaluated genotypes of sows in numbers of live-born piglets and reared piglets, however it is evident that better results were reached by the sows of the genotype II. Also the losses of piglets per litter were lower, by 0.65 piece (P ≤ 0.05). In sows of the genotype I a high correlation (P ≤ 0.01) was confirmed between the number of live-born piglets and the number of reared piglets per litter (r = 0.750). Another correlation was found between the number of live-born piglets and their losses before weaning (r = 0.716). Similar trend was observed in the genotype II, however without significant correlation between the number of live-born piglets and the losses of piglets before weaning. The results also revealed that the piglets died mostly before the 14 th day of age, while the losses of male piglets were more frequent than of female piglets. Losses of female piglets of the genotype I before the 14 th day of age were 6.82 %, in the genotype II they were 3.01 %. In this period, the losses of male piglets reached 9.56 % in the genotype I and 4.49 % in the genotype II. From the 14 th day to weaning the losses of female piglets counted 2.39 % vs. 0.75 %, the losses of male piglets 1.37 % vs. 2.88 %. The total losses from birth to weaning were 9.22 % vs. 3.76 % in female piglets and 10.92 % vs. 7.37 % in male piglets.