Photoperiod and luteinizing hormone secretion in domestic and wild pigs

Hälli, Outi; Peltoniemi, Olli; Tast, Anssi; Virolainen, Juha; Munsterhjelm, Camilla; Valros, Anna; Heinonen, Mari

doi:10.1016/j.anireprosci.2006.11.019

Cited by 7 publications

(7 citation statements)

References 19 publications

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“…Our experiment relied on the hypothesis that this phenomenon would also function in pigs. Thus far, however, we have been unable to prove this conclusively (Hälli et al. 2006).…”

Section: Discussionmentioning

confidence: 86%

Short or Long Day Light Regimes May Not Affect Reproductive Performance in the Sow

Hälli

Tast

Heinonen

et al. 2008

Reprod Domestic Animals

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The objective of this study was to evaluate the effect of short or long day light regimes on the reproductive performance in the sow. The study comprised approximately 1300 sows and their 3400 breedings in three commercial sow pools, in which a batch farrowing of 40 sows was employed. Each batch remained in the farrowing unit for 8 weeks under either a short day (10 h light, 14 h dark) or a long day (14 h light, 10 h dark) light regime. After weaning and transportation to the central unit, all sows were kept under the long day regime until they were moved back to the farrowing unit. Production results for each individual sow were recorded. The effect of the two different light regimes on the farrowing rate (FR) and on the weaning-to-oestrous interval was evaluated using logistic and Poisson regression models, respectively. The light regime affected none of the parameters significantly. The FR in June, July and August did, however, drop below that in December, January and February (OR 0.7, p < 0.05). The FR was affected by the sow pool (p < 0.01). Parity two sows exhibited a lower FR (OR 0.5, p = 0.05) and higher incidence of delayed first oestrus (IRR 2.7, p < 0.01) than did older sows. This study indicates that despite an artificial light regime, sows may still react to changes in season. In conclusion, use of simple light regime to obtain complete control over reproductive performance appears to be difficult.

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“…Our experiment relied on the hypothesis that this phenomenon would also function in pigs. Thus far, however, we have been unable to prove this conclusively (Hälli et al. 2006).…”

Section: Discussionmentioning

confidence: 86%

Short or Long Day Light Regimes May Not Affect Reproductive Performance in the Sow

Hälli

Tast

Heinonen

et al. 2008

Reprod Domestic Animals

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“…Some scholars analysed the mechanism of above effects caused by light conditions and their main conclusions are shown in Table 10. According to Table 10, Hälli et al (2008) found that the LH concentration of sows under the light–dark cycle of 16:8 was higher than that of sows under the light–dark cycle of 8:16. However, there was no significant difference in the mean LH concentration of sows in puberty under the two light–dark cycles, as shown in Figure 4.…”

Section: Resultsmentioning

confidence: 99%

A review on the effect of light–thermal–humidity environment in sow houses on sow reproduction and welfare

Xie

et al. 2023

Reprod Domestic Animals

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The environment in sow houses is the key to restrict sow production due to its significant effect on sow growth and reproduction. In this article, the effect of light, thermal and light–thermal–humidity environment in sow houses is systematically reviewed for sow reproduction and welfare according to the existing literature. The results show the optimal ambient temperature range for sows is approximately 16–22°C, as well as the lowest and highest critical temperature are 16 and 27°C respectively. Meanwhile, the increase of relative humidity from 50% to 70% is equivalent to the increase of effective temperature by 0.9°C in sow houses. In addition, the evaluation indexes are summarized to the future research direction is proposed according to the reviewed results. It can be concluded that the current research mainly focuses on the effect mechanism of light–thermal–humidity environment on sow growth and reproductive performance, as well as the optimal regulation range of light–thermal–humidity environment. In particular, it is a popular topic to further study the effect of light–thermal–humidity environment on the genetic material of sows, as well as metabolic parameters and body composition of their offspring. The above conclusions can contribute to guiding the regulation of light–thermal–humidity environment in sow houses and improving the sow welfare.

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“…Additionally it appears that a hypothalamo-pituitary-ovarian axis function in gilts that are kept in low PP from 91 to 150 days old develop more slowly than those kept in longer PP conditions. For example, a previous study showed that both the basal and the mean LH levels in gilts kept under short-day light control (8-h light:16-h dark) were lower than those kept under long-day light control (16-h light:8-h dark; Halli et al, 2008).…”

Section: Discussionmentioning

confidence: 96%

“…The value of >25 • C was selected for the definition of hot days because it has been shown to be the critical upper temperature for sows (Quiniou and Noblet, 1999). Also, this period was chosen because it covers the period just before most gilts are entered into herds (mean ± SEM: 177.5 ± 0.20 days old) and also because a previous report has suggested that LH secretion and pulse frequency increase from this period (70-135 days old) in prepubertal gilts (Halli et al, 2008). Additionally, gilts were classified into four season groups on the basis of the date on which they were 91 days old: January to April (91-150 days old age period in months with increasing PP), May to June (transitional period 1), July to October (91-150 days old age period in months with decreasing PP) and November to December (transitional period 2).…”

Section: Climate Data and Seasonmentioning

confidence: 99%

Delayed age of gilts at first mating associated with photoperiod and number of hot days in humid subtropical areas

Iida

Koketsu

2013

Animal Reproduction Science

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Photoperiod and luteinizing hormone secretion in domestic and wild pigs

Cited by 7 publications

References 19 publications

Short or Long Day Light Regimes May Not Affect Reproductive Performance in the Sow

Short or Long Day Light Regimes May Not Affect Reproductive Performance in the Sow

A review on the effect of light–thermal–humidity environment in sow houses on sow reproduction and welfare

Delayed age of gilts at first mating associated with photoperiod and number of hot days in humid subtropical areas

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