Serum concentrations of melatonin during scotophase and photophase in 3, 4, 5 and 6 month old gilts and barrows

Green, Mike L.; Clapper, J. A.; Diekman, M. A.

doi:10.1016/s0378-4320(99)00049-4

Cited by 4 publications

(2 citation statements)

References 27 publications

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“…Thereafter, several discrepant studies have been published (e.g. [ 9 , 11 , 12 , 10 , 4 , 5 ]), and the deviations of the results have been explained by variations of light intensity [ 13 ], by the great pig-to-pig variability [ 11 , 4 ] and by inadequate assay methods [ 15 , 1 ].…”

Section: Introductionmentioning

confidence: 99%

Plasma Melatonin Levels in Relation to the Light-Dark Cycle and Parental Background in Domestic Pigs

Andersson

2001

Acta Vet Scand

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Andersson H: Plasma melatonin levels in relation to the light-dark cycle and parental background in domestic pigs. Acta vet. scand. 2001, 42, 287-294. -To study porcine melatonin secretion in a stable environment 3 daytime (10.00 -15.00) and 3 nighttime (22.00 -03.00) plasma samples were collected by jugular venipuncture from 15 gilts, 16 sows, 3 boars and 48 piglets (24 females and 24 males from 8 litters) and analysed for melatonin content. Nighttime melatonin concentrations were higher than daytime melatonin concentrations (p<0.001), whereas no effect of sampling order could be discerned. The 3 adult Hampshire boars had higher melatonin concentrations during the day and the night, than the 31 adult Yorkshire females (p<0.05). There was no clear difference between gilts and sows in plasma melatonin. The gilts from one of the litters had higher plasma melatonin concentrations than the gilts in 3 other litters (p<0.05). Among the 48 piglets, the increase of nocturnal melatonin secretion differed between litters (p<0.01), whereas the influence of father was not quite significant (p=0.12). No difference in daytime melatonin concentrations between litters could be found, and there was no difference in melatonin levels between the male and female piglets. In conclusion, this study demonstrates that domestic pigs express a nocturnal increase of melatonin secretion in a standard stable environment. For some animals the amplitude of nighttime melatonin secretion was very low, although always higher than the daytime base levels. Furthermore, the levels of nighttime melatonin secretion differed between litters, which suggests a genetic background.genetic.

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Section: Introductionmentioning

confidence: 99%

Plasma Melatonin Levels in Relation to the Light-Dark Cycle and Parental Background in Domestic Pigs

Andersson

2001

Acta Vet Scand

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“…En las especies con reproducción estacional, la secreción de melatonina juega un papel muy importante en la reproducción, elevándose durante los periodos de oscuridad y disminuyendo durante las horas de luz. Sin embargo, este patrón de secreción puede variar de acuerdo a la intensidad de la luz y a la edad del animal (Green et al, 1999). En la especie porcina, debido a que la melatonina no muestra un claro ritmo circadiano (Paterson et al, 1992;Bubenik et al, 2000), su patrón de secreción es menos evidente (McConnell and Ellendorff, 1987;Paterson et al, 1992).…”

Section: Fotoperiodo Y Temperatura Ambientalunclassified

Estrategias en el manejo reproductivo de la cerda para la mejora de la fertilidad = Reproductive management strategies for improving sow fertility

Hidalgo¹

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Capítulo 2/Chapter 2: Introducción y planteamiento ………………………………….. 31 Capítulo 3/Chapter 3: Revisión bibliográfica …………………………………………. 42 Capítulo 4/Chapter 4: Objetivos/Objectives …………………………………………... 97 Capítulo 5/Chapter 5: Influence of gonadotrophin-induced first estrus on gilt fertility. 103 Capítulo 6/Chapter 6: Influence of lactation length and gonadotrophins administered at weaning on fertility of primiparous sows ……………………………………………….. 122 Capítulo 7/Chapter 7: Relationship between estrus responses of prepubertal gilts to gonadotrophin treatment and subsequent sow fertility and retention to parity four ……. 139 Capítulo 8/Chapter 8: Relationship between vaginal mucus conductivity and time of ovulation in weaned sows ………………………………………………………………. 154 Capítulo 9/Chapter 9: Resumen global de metodología y resultados ………………… 173 Capítulo 10/Chapter 10: Discusión general …………………………………………... 187 Capítulo 11/Chapter 11: Conclusiones/Conclusions …………………………………. 203 Capítulo 12/Chapter 12: Bibliografía ………………………………………………… 212 Examination of fertility in estrus-induced gilts Influence of gonadotrophin-induced first estrus on gilt fertility; D.

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Endocrine changes and management factors affecting puberty in gilts

Evans

O’Doherty

2001

Livestock Production Science

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Serum concentrations of melatonin during scotophase and photophase in 3, 4, 5 and 6 month old gilts and barrows

Cited by 4 publications

References 27 publications

Plasma Melatonin Levels in Relation to the Light-Dark Cycle and Parental Background in Domestic Pigs

Plasma Melatonin Levels in Relation to the Light-Dark Cycle and Parental Background in Domestic Pigs

Estrategias en el manejo reproductivo de la cerda para la mejora de la fertilidad = Reproductive management strategies for improving sow fertility

Endocrine changes and management factors affecting puberty in gilts

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