Seasonal inhibition of puberty in domestic gilts is overcome by melatonin administered orally, but not by implant

Paterson, Andrew M.; Maxwell, Colin A.; Foldes, A.

doi:10.1530/jrf.0.0940097

Cited by 26 publications

(10 citation statements)

References 18 publications

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“…The present findings are in accordance with the findings of Paterson et al (1992) who reported that daily feeding of 1 mg melatonin increased the proportion of gilts which reach puberty. Among the 24 gilts which were fed melatonin 15 (56.6%) reached puberty compared with six of the 25 (24%) control gilts.…”

Section: Resultssupporting

confidence: 93%

Effects of Antioxidants in Ameliorating Seasonal Stress in Pig Puberty

Chakraborty¹,

Baruah²,

Bora³

et al. 2017

Int. J. Livest. Res.

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Section: Resultssupporting

confidence: 93%

Effects of Antioxidants in Ameliorating Seasonal Stress in Pig Puberty

Chakraborty¹,

Baruah²,

Bora³

et al. 2017

Int. J. Livest. Res.

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“…Secretion of LH in the long-day gilts was not affected by the continuous high concentration of plasma melatonin provided by the implants, suggesting that the inhibition of development of the hypo-pituitary-ovarian axis imposed by the long-day photoperiod was not overcome by the implants. This suggestion is supported by the recent observation of Paterson (1990), that melatonin implants given to gilts under shed conditions in the summer did not prevent the seasonal inhibition of puberty, which is mediated by daylength (Paterson & Pearce, 1990). In sheep (Lincoln & Ebling, 1985;English et al, 1986), deer (Adam et al, 1989) and goats (McGregor et al, 1989), melatonin implants can stimulate reproductive activity under inhibitory photoperiods, but this does not appear to be the case in gilts.…”

Section: Discussionmentioning

confidence: 59%

Concentrations of plasma melatonin and luteinizing hormone in domestic gilts reared under artificial long or short days

Paterson¹,

Martin²,

Foldes³

et al. 1992

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Plasma melatonin concentrations were measured every 1-2 h over 24 h and plasma luteinizing hormone (LH) concentrations every 15 min over 12 h in domestic gilts reared under artificial light regimens that had previously been used to demonstrate photoperiodic effects on puberty. In Expt 1, the light regimens both commenced at 12 h light: 12 h dark (12L:12D) and either increased (long-day) or decreased (short-day) by 15 min/week until the long-day gilts were receiving 16L:8D and the short-day gilts 8L:16D at sampling. In Expt 2, both light regimens commenced at 12L:12D and either increased (long-day) or decreased (short-day) by 10 or 15 min/week to a maximum of 14.5L:9.5D or a minimum of 9.5L:14.5D before being reversed. Sampling took place when daylength had returned to 14L:10D (long-day) or 10L:14D (short-day). In immature gilts housed at 12L:12D (Expt 1) and in postpubertal (Expt 1) and prepubertal (Expt 2) gilts reared under long-day or short-day light regimens, mean plasma melatonin concentrations were basal (3.6 pg/ml) when the lights were on and increased to peak concentrations greater than 15 pg/ml within 1-2 h after dark, before declining gradually to basal concentrations at or near the end of the dark phase. In prepubertal gilts bearing subcutaneous melatonin implants and reared under long-days (Expt 2), mean plasma melatonin concentration in the 6 h before dark was 91.9 +/- 5.26 pg/ml and 125.0 +/- 6.66 pg/ml 1 h after dark, but this increase was not statistically significant. In Expt 2, the short-day gilts had fewer LH pulses (2.6 +/- 0.25 vs. 4.6 +/- 0.24; P less than 0.01) in the 12-h sampling period than the long-day gilts, but the amplitude of the pulses (2.28 +/- 0.23 vs. 1.26 +/- 0.16 ng/ml; P less than 0.01) and the area under the LH curve (78.8 +/- 5.60 vs. 47.3 +/- 6.16; P less than 0.01) was greater in the short-day gilts. In the short-day, but not in the long-day, gilts LH pulses were more frequent (2.0 +/- 0.0 vs. 0.6 +/- 0.25; P less than 0.01), but had a smaller area (61.9 +/- 7.2 vs. 120.2 +/- 23.6; P less than 0.05) in the 6 h of dark than in the 6 h of light, which together made up the 12-h sampling period.(ABSTRACT TRUNCATED AT 400 WORDS)

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“…In addition, Andersson et al [1998] showed that, in boars, a short-day lighting regimen advances testicle maturation. It has also been shown that afternoon oral administration of melatonin can override the seasonal delay of the puberty [Diekman et al, 1991;Paterson et al, 1992b].…”

Section: Discussionmentioning

confidence: 99%

Seasonal alterations in circadian melatonin rhythms of the European wild boar and domestic gilt

Tast

Hälli

Ahlström

et al. 2001

Journal of Pineal Research

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The aims of the present study were: 1) to determine if the European wild boar exhibits a circadian pattern of melatonin secretion under its natural light environment; 2) to compare this pattern with the pattern in domestic pigs reared under the light environment typical for domesticity; and 3) to determine if there are seasonal alterations in melatonin rhythms. Four to six young, pure-bred, European wild boars and four to six cross-bred (Yorkshire x Finnish Landrace) domestic gilts were sampled at 2-hr intervals for 48 hr at the spring/autumn equinoxes and summer/winter solstices. Samples were obtained via saphenous arterial catheters from the wild boars and via ear vein catheters from the domestic gilts. The ambient light intensity was recorded simultaneously with sampling both outdoors and indoors. Following ether extraction, the serum samples were assayed for melatonin using a commercial RIA (Bühlman). All the experimental animals exhibited a distinct circadian pattern in melatonin secretion, with high concentrations occurring during the scotophase. There was no difference in scotophase melatonin response between the wild boars and domestic gilts in any season in terms of mean melatonin concentration or peak value. The mean duration of increased melatonin secretion (more than two standard deviations over a mean photophase concentration) in 24 hr in the wild boars in spring, summer, autumn and winter, was 10, 6, 11 and 17 hr, respectively, and in the domestic gilts, 9, 8, 12 and 11 hr, respectively. These results demonstrate the existence of circadian rhythm in melatonin secretion in both the European wild boar and domestic pig. In both groups, the duration of secretion is subject to seasonal alterations. The results suggest no difference in photoperiodic-melatonin transduction between the European wild boar and domestic pig whether due to altered genotype or reduced light environment.

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Seasonal inhibition of puberty in domestic gilts is overcome by melatonin administered orally, but not by implant

Cited by 26 publications

References 18 publications

Effects of Antioxidants in Ameliorating Seasonal Stress in Pig Puberty

Effects of Antioxidants in Ameliorating Seasonal Stress in Pig Puberty

Concentrations of plasma melatonin and luteinizing hormone in domestic gilts reared under artificial long or short days

Seasonal alterations in circadian melatonin rhythms of the European wild boar and domestic gilt

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