Factors Affecting Boar Reproduction, Testis Function, and Sperm Quality

Pinart, E.; Puigmulé, Marta

doi:10.1007/978-3-642-35049-8_4

Cited by 10 publications

(18 citation statements)

References 304 publications

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“…From our data, it seems that individual rather than breed differences are contributing factors, as all our boars came from the same breed. This finding is similar to what has been observed by others, even though in some cases cryopreserved rather than fresh spermatozoa were used (Waterhouse et al, ; Pinart and Puigmulé, ). As HSP expression was also found to be correlated with and influenced by sperm‐binding indexes throughout co‐culture, direct contact (i.e., without a diffusible membrane insert) and the number of sperm that bind to epithelial cells are relevant for upregulating gene expression.…”

Section: Discussionsupporting

confidence: 91%

Viable and morphologically normal boar spermatozoa alter the expression of heat‐shock protein genes in oviductal epithelial cells during co‐culture in vitro

Yeste

Holt

Bonet

et al. 2014

Molecular Reproduction Devel

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The principal aim of this study was to determine if boar spermatozoa influence the expression of four selected chaperone and heat-shock protein (HSP) genes-namely clusterin (CLU), HSP90AA1, HSPA5, and HSPA8-in oviductal epithelial cells (OECs) during in vitro co-culture. All corresponding proteins of these genes were previously identified in a sperm-interacting, 70-kDa soluble fraction derived from apical plasma membranes of OECs. The present study also sought to determine whether or not: (i) spermatozoa must directly bind to OEC for an effect on gene expression to be elicited and (ii) reproductive and nonreproductive epithelial cell types (LLC-PK1, pig kidney) respond equivalently, in terms of alterations in chaperone and HSP gene expression, during co-culture with sperm. Spermatozoa induced a significant upregulation (P < 0.05) in HSP90AA1 and HSPA5 in OECs after 3 hr, and in HSPA8 after 6 hr of co-culture when they were in direct contact with epithelial cells. Conversely, no upregulation of HSP transcription was observed when spermatozoa did not directly bind to OECs. Spermatozoa also induced a significant upregulation (P < 0.05) of the same three genes when in direct contact with LLC-PK1 cells, but the timing occurred later than with OECs. Interestingly, the extent of HSP gene upregulation induced by direct contact of spermatozoa with epithelial cells was dependent on sperm-binding index and on the viability and morphological quality of the bound sperm population. In conclusion, the upregulation of HSP genes caused by direct contact between spermatozoa and OECs, rather than nonreproductive epithelial cells, suggests HSPs could play an integral role in the modulation of sperm function in the oviductal reservoir.

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Section: Discussionsupporting

confidence: 91%

Viable and morphologically normal boar spermatozoa alter the expression of heat‐shock protein genes in oviductal epithelial cells during co‐culture in vitro

Yeste

Holt

Bonet

et al. 2014

Molecular Reproduction Devel

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“…Expression of libido is influenced by genetic and hormonal factors, and by paragenetic impacts (social environment, season, accommodation, training of boars to jump), so that changes in libido may indirectly indicate technological deficiencies (bad microclimate, fattening conditions, exposure to stress, and poor training of workers that manipulate the animals). Boar reproductive performance (quality of ejaculate, fertility and sexual behaviour) shows special seasonal changes (Pinart & Puigmulé, 2013).…”

Section: Introductionmentioning

confidence: 99%

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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“…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). The study of Andersson (2000) shows the stimulatory effect of a short day on puberty maturing of spermatogenesis.…”

Section: Discussionmentioning

confidence: 94%

“…Boar reproductive performance variables (quality of ejaculates, fertility, and sexual behaviour) show distinct seasonal changes (Pinart and Puigmulé, 2013). The boar sexual activity can be influenced by a number of genetic and paragenetic factors, and, according to the report of Hemsworth and Tilbrook (2007), the understanding of the regulation of boar sexual behaviour is important for the optimization of its reproductive performance.…”

Section: Introductionmentioning

confidence: 99%

“…The sexual behaviour of males depends on the interaction between the body and the environment (Wysokińska and Kondracki, 2014). While some authors think that the autumn photoperiod, with decrease in daylight, has a stimulatory effect on the boar reproductive ability in comparison with the photoperiod when the daylight increases, other studies indicate significant differences between the breeds and their reaction to the light regime (Pinart and Puigmulé, 2013). Photoperiod is a well-known modulator of sperm production in mammals as an effect of the melatonin regulation mechanism (Knecht et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

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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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Factors Affecting Boar Reproduction, Testis Function, and Sperm Quality

Cited by 10 publications

References 304 publications

Viable and morphologically normal boar spermatozoa alter the expression of heat‐shock protein genes in oviductal epithelial cells during co‐culture in vitro

Viable and morphologically normal boar spermatozoa alter the expression of heat‐shock protein genes in oviductal epithelial cells during co‐culture in vitro

Variability in ejaculation rate and libido of boars during reproductive exploitation

Effect of photoperiod on sexual activity of boar

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