Effects in genetic evaluation for semen traits in Czech Large White and Czech Landrace boars

Wolf, Jochen B. W.; Smital, J.

doi:10.17221/1658-cjas

Cited by 28 publications

(21 citation statements)

References 22 publications

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“…The results of the present study were consistent with the research of Szostak & Sarzyńska (2011), who found statistically significant differences between breeds in the average expression and variability of libido. There was a tendency towards increase in ejaculate volume with age of boar, which was similar to the results presented by Jankevičiûtė & Žilinskas (2002), Wolf & Smital (2009a;b), Banaszewska & Kondracki (2012) and Savić et al (2013). In the research of Frangež et al (2005), the best libido was manifested when the ejaculate was collected twice a week, whereas shortening the interval between two collections resulted in a decline in libido.…”

Section: Resultssupporting

confidence: 88%

Variability in ejaculation rate and libido of boars during reproductive exploitation

Savić

Petrović

2015

SA J. An. Sci.

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The main objective of the study was to evaluate variability in the ejaculation rate and libido of boars under various genetic and non-genetic influences. A total of 7171 semen samples were collected from Swedish Landrace, Large White and Duroc boars reared under commercial production conditions. Time spent in preparing or collecting, constituted the period from the entry of boars into the room for collecting semen to onset of ejaculation. Ejaculation rate was defined as the volume of sperm extracted (mL) per unit of time (min). The index of boar libido was defined as the relationship between productive (duration of ejaculation) and unproductive (time spent in preparing to collect/jump) periods. Average values of the interval between two collections, age of boar at collection, time spent in preparing for collection, duration of ejaculation, volume of ejaculate, rate of ejaculation and libido index were: 8.83 days, 551.2 days, 3.56 min, 6.06 min, 231.9 mL, 37.67 mL/min and 1.76, respectively. Ejaculate traits and libido varied according to breed, season and collector, with the exception of seasonal variability of duration of ejaculation. The regression effect of the interval between two collections of ejaculate and age of boar at collection was not statistically significant only for duration of preparing for collection. Unlike the ejaculation rate, during the summer and autumn periods, boars exhibited weaker libido than in winter and spring. Duroc boars were inferior to the fertile breeds (Swedish Landrace and Large White) in terms of shorter duration of ejaculation, lower volume, lowest rate of ejaculation and weakest libido. Variability of rate of ejaculation and of boar libido indicates the need to include these traits in breeding programmes and the possibility of improving these traits.

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Section: Resultssupporting

confidence: 88%

Variability in ejaculation rate and libido of boars during reproductive exploitation

Savić

Petrović

2015

SA J. An. Sci.

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“…The effect of daylight within photoperiod interval is in agreement with the research of Knecht et al (2013), in which a significant effect of photoperiod was determined on the variability of ejaculate volume. There is a trend of increase in the volume of ejaculate with the increase in boar age, which is consistent with the investigations of Wolf and Smital (2009), Banaszewska and Kondracki (2012), and Savić et al (2013). The increase in ejaculate volume with aging also agrees with the results of Kondracki et al (2013), who showed that in boar, the volume increased at the beginning of utilisation, after three months and after six months of exploitation (221.72, 251.14, and 269.20 mL).…”

Section: Discussionsupporting

confidence: 91%

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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“…It could be caused by variation of temperature in the summer season. Several studies have shown that elevated ambient temperatures, heat stress and/or hot weather have an adverse effect on sperm production (McNitt et al, 1970;Colenbrander et al, 1993;Frydrychová et al, 2007;Wolf et al, 2009) and sperm morphology in boars (Larsson et al, 1984;Malmgren, 1989). On the other hand, it could also be an influence of the hereditary background (Čeřovský, 2005).…”

Section: Discussionmentioning

confidence: 99%

Effects of long-term liquid commercial semen extender and storage time on the membrane quality of boar semen

Frydrychová¹,

Čeřovský²,

Lustyková³

et al. 2010

CZECH J ANIM SCI

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ABSTRACT:The objective of this study was to assess the sperm membrane integrity in extended boar semen during storage time using specific spectrum laboratory methods. Boar semen was diluted with the long-term liquid commercial extenders Androhep (A), Androstar (AS), Androstar plus (AS + ), LD and M III and was stored up to 96 h. The sperm membrane integrity was evaluated by motility, viable spermatozoa, short hypoosmotic swelling test (sHOST) and by the activity of the enzyme aspartate aminotransferase (AST). Negative changes in the quality of sperm membrane in relation to storage time were observed after 48 h for sHOST, after 72 h for viable spermatozoa and after 72 h for motility. The percentage of viable spermatozoa was decreased by 0.27% each hour. A statistically significant difference between extenders A and LD was observed in sHOST after 72 h and 96 h storage (P < 0.05). The AST activity did not show any statistically significant differences in extenders and in storage time. In overall assessment Androhep was the best of the tested extenders, followed by AS, AS + , M III and LD in terms of motility, viable spermatozoa and sHOST. The correlations among laboratory methods were highly significant (P < 0.001). In conclusion, the results documented that the sperm membrane integrity was statistically significantly affected by extenders and storage time (P < 0.001). Boar semen quality was the best in extender A. sHOST is a very sensitive and relatively simple method for the assessment of sperm membrane integrity in diluted semen.

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Effects in genetic evaluation for semen traits in Czech Large White and Czech Landrace boars

Cited by 28 publications

References 22 publications

Variability in ejaculation rate and libido of boars during reproductive exploitation

Variability in ejaculation rate and libido of boars during reproductive exploitation

Effect of photoperiod on sexual activity of boar

Effects of long-term liquid commercial semen extender and storage time on the membrane quality of boar semen

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