Effects of season and regulated photoperiod on the reproductive performance of sows

Chokoe, Tlou Caswell; Siebrits, F.K.

doi:10.4314/sajas.v39i1.43545

Cited by 13 publications

(10 citation statements)

References 36 publications

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“…Rivera et al (2005) have concluded that factors relating to temperature and humidity are more important than the length of daylight. In the opinion of Chokoe & Siebrits (2009), temperature is a very important factor in natural mating. The studies by Wetteman & Bazer (1985), Sonderman & Luebbe (2008) and Flowers (2008) confirmed that thermal stress negatively affects sperm quality and ejaculation volume.…”

Section: Discussionmentioning

confidence: 99%

The influence of boar breed and season on semen parameters

Knecht¹,

Środoń²,

Duziński³

2014

SA J. An. Sci.

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The aim of the present study was to demonstrate the influence of boar breed and season on semen parameters. The research material consisted of 31 boars: Polish Large White (PLW), Polish Landrace (PL), and Duroc × Pietrain (D × P), aged 8 to 24 months. The analysed material consisted of 1390 ejaculates, collected during the period January 2010 to October 2012. Semen samples were assessed in terms of semen volume (mL), sperm concentration (× 10 6 m/mL), total number of sperm (× 10 9 ), total number of live sperm (× 10 9 ) and number of insemination doses obtained from one ejaculate (n). In winter, an increase in sperm concentration was observed for the PLW breed. Moreover, an increase in the volume of semen produced for this breed was noted in summer and autumn. Differences between breeds for the total number of sperm and total number of live sperm were observed for the winter and spring periods. The largest semen volume was noted for the PLW breed (276.4 ± 9.66 mL). However, in the analysis of other sperm parameters, boars of this breed demonstrated the poorest results. The highest insemination dose was obtained from breed D × P in winter (26.0 ± 0.51). Correlation analyses indicated that PLW and D × P boars are the least resistant to higher ambient temperatures, and in summer and autumn this resulted in a reduction in sperm concentration (-0.26 and -0.20, respectively).

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Section: Discussionmentioning

confidence: 99%

The influence of boar breed and season on semen parameters

Knecht¹,

Środoń²,

Duziński³

2014

SA J. An. Sci.

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“…Occurrence (or maintenance) of these changes during the two years of monitoring in the present experiment illustrates the existence of seasonal influences. Because photoperiodicity could explain the differences in puberty age and DE under different climatic conditions, this calls into question the involvement of the pineal-hypothalamus-pituitarygonad axis, but the specifics of this mechanism in pigs are far from being fully explained (Prunier et al, 1996;Tast, 2002;Chokoe & Siebrits, 2009). It also calls for a controlled study that takes into consideration all factors of ambient temperature, melatonin, nutrition, and male effects, together with their interactions.…”

Section: Discussionmentioning

confidence: 99%

“…The seasonal effects on the reproductive performance of domestic sows were described many years ago, with a period of infertility during summer and early autumn (Hutchens et al, 1978;Hurtgen et al, 1980;Somade & Makinde, 1985). This incorporates common manifestations of decreased reproductive parameters, including delayed puberty in gilts, prolonged WEI, lower farrowing rate, and reduced litter size (Tummaruk et al, 2004;Chokoe & Siebrits, 2009). These influences are induced primarily by photoperiod and climatic variations, especially temperature.…”

Section: Introductionmentioning

confidence: 99%

“…melatonin profile) and genetic factors are important elements in seasonal variations of reproductive parameters in sows (Gourdine et al, 2006;Chokoe & Siebrits, 2009). Knox & Zas (2001) and Knox et al (2002) reported that seasonal photoperiodicity is related to length of lactation, frequency of exposure to boar, housing, feed, light conditions, and group size.…”

Section: Introductionmentioning

confidence: 99%

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Investigation into the effect of season on oestrus in gilts over two years of climate adaptation

Dojana¹,

Cotor²,

Codreanu³

et al. 2017

SA J. An. Sci.

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This study examined the changes in age at first oestrus, the weaning-to-oestrus interval (WEI), and duration of oestrus (DE) in a Yorkshire sow population during two years of adaptation from a northern (55°48′N, 9°13′W) European region to a southern (44°03′N, 23°35′W) one. The adaptation process induced a grouping effect of gilts around the mean age of the onset of puberty. Autumn and spring were characterized by the most enhanced gilt grouping effect at 201 to 210 days of age. The same effect was found for oestrus duration, which declined from a 12-to 96-hour range in the first year to an 18-to 90-hour range in the second year. The mean age of first oestrus was 0.8 days significantly lower in the second year compared with the first; the maximal lowering (1.7 days) occurred in the winter season. The WEI decreased significantly from the first to the second year in all four seasons, by a mean annual value of 0.88 days (15.9%). DE increased by 6.5 hours (significantly for all seasons) from the first year to the next. DE showed an ascending evolution from winter to spring and descending from summer to autumn, during each monitored year. Adaptation influences the oestrus in sows. The age to puberty and WEI tended to decrease, while DE tended to increase, with a simultaneous decrease in the variability of these oestrus parameters. ______________________________________________________________________________________

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“…However, there is little information on how season affects the ovarian physiology and oocyte developmental competence [17]. Previous studies on seasonal infertility have concentrated on weaning-to-estrus intervals [18], conception rates [19], early disruption of pregnancy [20], and decreased litter size [21] as measures of reproductive outcomes, and there has been limited work on the effects of season on oocyte development before fertilization [22][23][24]. As a result, the underlying effects of season on oocyte developmental competence in cycling gilts are not well understood, and the physiological mechanisms through which season disrupts early pregnancy are yet to be established [17].…”

Section: Introductionmentioning

confidence: 99%