The Impact of Season of Birth and Breeding of Boars of Polish Landrace Breed on Their Insemination Efficiency

Pokrywka, K.; Tereszkiewicz, K.; Ruda, M.

doi:10.5513/jcea01/15.3.1487

Cited by 4 publications

(4 citation statements)

References 3 publications

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“…Similarity can also be found with the study of Pokrywka et al (2014), who determined higher ejaculate volume of 280.61 mL in boars born in summer and used during autumn. Pinart and Puigmulé (2013) point out the stimulatory effect of day shortage during autumn on boar reproductive capability (increase in the ejaculate volume).…”

Section: Discussionsupporting

confidence: 87%

Effect of photoperiod on sexual activity of boar

Savić

Petrović

2015

R. Bras. Zootec.

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-The main objective of this study was to assess the effect of photoperiod on sexual activity of three breeds of boars: Swedish Landrace (n=34), Large White (n=38), and Duroc (n=32). Boar sexual activity was analysed based on the libido index and intensity of ejaculation. The libido index was calculated as the ratio between the duration of ejaculation and time of preparation until ejaculation. The intensity of ejaculation was the volume of ejaculate (mL) secreted in the unit of time (min). The effect of photoperiod was analysed as the effect of duration of daylight (<12 h and >12 h) within photoperiod intervals (increasing and decreasing). Impact assessment was carried out by applying the General Linear Model procedure. Libido and intensity of ejaculation varied under the impact of photoperiod and the breed of boars. With the increase in age, the boar libido weakened, while the volume of ejaculate and intensity of ejaculation increased. Boars manifested better libido when the daylight lasted longer than 12 h in both photoperiod intervals. Different from libido, the volume of ejaculate and intensity of ejaculation were highest when the daylight was shorter than 12 h, but only in the decreasing photoperiod interval. Swedish Landrace boars manifested best libido, while in the production of sperm the Duroc boars were inferior compared with Swedish Landrace and Large White. The phenotypic relationship among libido, ejaculate volume, and ejaculation intensity ranges from very low to high; however, the coefficients were positive, which indicates the possibility of simultaneous improvement of these traits.

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Section: Discussionsupporting

confidence: 87%

Effect of photoperiod on sexual activity of boar

Savić

Petrović

2015

R. Bras. Zootec.

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“…Seasonal variation in the properties of the semen have also been observed in hybrids of the wild boar and the domestic pig [Kozdrowski and Dubiel 2004a]. Research [Milewska and Falkowski 2004, Pokrywka et al 2014, Petrocelli et al [2015, Szostak and Przykaza 2016] shows that the long-term process of pig domestication did not lead to a complete elimination of seasonal variation in breeding use and boars' sexual activity. The influence of the season on quantitative and qualitative properties of boars' semen has been confirmed in numerous studies.…”

Section: Introductionmentioning

confidence: 99%

“…These changes lead to the lowering of production and concentration of spermatozoa in the ejaculate. Studies [Brucka-Jastrzębska et al 2008, Knecht et al 2013, Pokrywka et al 2014, Górski et al 2017 show that seasonal changes in boars' semen properties may vary in different breeds of pigs. Breeds of pigs produced and maintained in the northern hemisphere in the zones further from the equator show a particular susceptibility to seasonal changes in sexual activity [Petrocelli et al 2015].…”

Section: Introductionmentioning

confidence: 99%

Results of Breeding Use of Insemination Boars of Selected Breeds in the Seasons of the Reproductive Cycle of the European Wild Boar (Sus Scrofa L.)

Tereszkiewicz¹,

Pokrywka²

2020

Acta Sci. Pol. Zootech.

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The study aimed to investigate changes in semen parameters of insemination boars of selected breeds with reference to seasonal changes in the properties of ejaculates in the European boar (Sus scrofa L.). The material for the study covered 88000 ejaculates obtained from boars of the following breeds: Polish Large White, Polish Landrace, Duroc, Hampshire, Pietrain, Duroc×Pietrain, Pietrain×Duroc. The results of the research indicate that seasonal changes in the quality of the produced ejaculates, similar to those occurring in the males of the wild boar, still occur in insemination boars. The observed changes concern above all the volume of the ejaculates, the total number and concentration of spermatozoa. Seasonal variation in the quality of the produced ejaculates is fixed and has not decreased in the recent years despite the conducted breeding activities, selection and the limitation of the influence of environmental factors.

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“…*The results of breeding use of insemination boars depend on numerous genetic, environmental and organizational factors (Knecht et al, 2017a;Petrocelli et al, 2015;Pokrywka et al, 2014;Smital, 2009) and are directly associated with quantitative and qualitative parameters of the produced semen. Therefore, boars used in insemination stations should produce ejaculates of high volume and sperm concentration (Gadea et al, 2004;Smital, 2009).…”

Section: Introductionmentioning

confidence: 99%

Evaluation and prediction of semen parameters of breeding boars and their use in stock management

Tereszkiewicz¹,

Pokrywka²,

Herbalists³

2019

Int. j. adv. appl. sci.

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Artificial insemination constitutes the main method of pig breeding in Europe. According to literature, statistical models which allow prediction of productive capacity can be used as additional tools which may be helpful in making selection decisions concerning breeding boars. The aim of the research was to evaluate the influence of boar's age, standardized daily growth rate, standardized meat content in the carcass, the number of nipples, the age when the boar starts to be used for breeding, the number of semen collections per month, and the interval between semen collections on selected qualitative and quantitative parameters of the semen and to calculate multiple regression equations, which would allow prediction of productive capacity of AI landrace boars. The material for the analysis comprised 47596 ejaculates obtained over the period 1995-2014 from 306 Polish Landrace boars. The obtained results show that semen parameters of the examined boars depend on physiological and organizational factors included in the analysis. It was observed that the following factors, measured with the number of produced semen doses, were of particular significance for the efficiency of use of the boars: boar's age, the daily growth rate, meat content in the carcass, as well as the number of collections and the interval between collections. The conducted statistical analysis points to the possibility of predicting semen parameters accurately using regression analysis. The models are characterized by very high accuracy, which points to their potential for application. The calculated determination coefficients for the multiple regression equations assumed the R 2 value of above 0.92. The highest value of the determination coefficient (R 2-0.99) was obtained for the percentage of sperm cells showing progressive motility. The calculated regression equations may be used in the management of the stock of breeding boars and when making selection decisions.

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The Impact of Season of Birth and Breeding of Boars of Polish Landrace Breed on Their Insemination Efficiency

Cited by 4 publications

References 3 publications

Effect of photoperiod on sexual activity of boar

Effect of photoperiod on sexual activity of boar

Results of Breeding Use of Insemination Boars of Selected Breeds in the Seasons of the Reproductive Cycle of the European Wild Boar (Sus Scrofa L.)

Evaluation and prediction of semen parameters of breeding boars and their use in stock management

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