EurekaMag
+ Most Popular
Cunninghamia lanceolata plantations in China
Mammalian lairs in paleo ecological studies and palynology
Studies on technological possibilities in utilization of anhydrous milk fat for production of recombined butter-like products
Should right-sided fibroelastomas be operated upon?
Large esophageal lipoma
Apoptosis in the mammalian thymus during normal histogenesis and under various in vitro and in vivo experimental conditions
Poissons characoides nouveaux ou non signales de l'Ilha do Bananal, Bresil
Desensitizing efficacy of Colgate Sensitive Maximum Strength and Fresh Mint Sensodyne dentifrices
Administration of fluid by subcutaneous infusion: revival of a forgotten method
Tundra mosquito control - an impossible dream?
Schizophrenia for primary care providers: how to contribute to the care of a vulnerable patient population
Geochemical pattern analysis; method of describing the Southeastern limestone regional aquifer system
Incidence of low birth weights in a hospital of Mexico City
Tabanidae
Graded management intensity of grassland systems for enhancing floristic diversity
Microbiology and biochemistry of cheese and fermented milk
The ember tetra: a new pygmy characid tetra from the Rio das Mortes, Brazil, Hyphessobrycon amandae sp. n. (Pisces, Characoidei)
Risk factors of contrast-induced nephropathy in patients after coronary artery intervention
Renovation of onsite domestic wastewater in a poorly drained soil
Observations of the propagation velocity and formation mechanism of burst fractures caused by gunshot
Systolic blood pressure in a population of infants in the first year of life: the Brompton study
Haematological studies in rats fed with metanil yellow
Studies on pasteurellosis. I. A new species of Pasteurella encountered in chronic fowl cholera
Dormancy breaking and germination of Acacia salicina Lindl. seeds
therapy of lupus nephritis. a two-year prospective study

Nocturnal variation of prolactin secretion in the Mouflon (Ovis gmelini musimon) and domestic sheep (Ovis aries): seasonal changes


Nocturnal variation of prolactin secretion in the Mouflon (Ovis gmelini musimon) and domestic sheep (Ovis aries): seasonal changes



Animal Reproduction Science 64(3-4): 211-219



ISSN/ISBN: 0378-4320

PMID: 11121897

DOI: 10.1016/s0378-4320(00)00213-x

Seasonal changes in nocturnal prolactin secretion and their relationship with melatonin secretion were monitored in wild (Mouflon, Ovis gmelini musimon) and domesticated sheep (breed Manchega, Ovis aries). Two groups of eleven adult females each, were maintained outdoors under natural photoperiod. Plasma concentrations of prolactin and melatonin were determined during the summer and winter solstices and the autumn and spring equinoxes. Blood samples were collected every 3h during the night hours, and 1h before and after the onset of darkness and sunrise. Maximum mean plasma concentrations of prolactin during the dark-phase in Mouflons were observed in the summer solstice, (P<0.001) and in the summer solstice and spring equinox in Manchega ewes (P<0.001). Mean plasma concentrations of prolactin were higher in the wild species (P<0.001) during the summer solstice. In contrast, during the spring equinox, mean levels of prolactin were higher in Manchega ewes than in Mouflons (P<0.05). Plasma prolactin concentrations showed a nocturnal rhythm in both breeds, with seasonal variations (P<0.001). The increase in plasma melatonin levels during the first hour after sunset was accompanied to increasing concentrations of PRL 1h after the onset of darkness, only in the autumn and spring equinox for the Mouflon, and in the summer solstice and spring equinox for the Manchega ewes. In Mouflons, the fall of plasma PRL concentrations about the middle dark-phase in all the periods studied, coincided with high levels of melatonin. A similar relation was observed in Manchega ewes only in the winter solstice and spring equinox. The current study shows that the nocturnal rhythm of prolactin secretion exhibits seasonal variation; differences in the patterns of prolactin secretion between Mouflon and Manchega sheep are taken to represent the effects of genotype.

Please choose payment method:






(PDF emailed within 0-6 h: $19.90)

Accession: 003510101

Download citation: RISBibTeXText

Related references

Richesse spécifique en helminthes gastro-intestinaux du Mouton (Ovis aries) et du Mouflon (Ovis musimon) introduits dans l'archipel de Kerguelen - Specific richness in gastrointestinal helminths from the domestic sheep (Ovis aries) and the Corsican mouflon (Ovis musimon) introduced onto the Kerguelen archipelago. International Mammalogy Congress 46(3-4): 305-312, 1996

Specific richness in gastrointestinal helminths from the domestic sheep Ovis aries and the Corsican mouflon Ovis musimon introduced onto the Kerguelen archipelago Richesse specifique en helminthes gastro-intestinaux du mouton Ovis aries et du mouflon Ovis musimon introduits dans larchipel de Kerguelen. Vie et Milieu 46(3-4): 305-312, 1996

A comparison between the -globin gene clusters of domestic sheep Ovis aries and Sardinian mouflon Ovis gmelini musimon. Genetics Selection Evolution (Paris): 283: 217-222, 1996

Seasonal changes in ovulatory activity, plasma prolactin, and melatonin concentrations, in mouflon (Ovis gmelini musimon) and Manchega (Ovis aries) ewes. Reproduction Nutrition Development 40(5): 421-430, 2000

A comparison between the beta -globin gene clusters of domestic sheep (Ovis aries) and Sardinian mouflon (Ovis gmelini musimon). Genetics, Selection, Evolution 28(3): 217-222, 1996

Attainment of puberty in the european Mouflon (Ovis gmelini musimon) and the domestic Manchega ewe (Ovis aries). Reproduction in Domestic Animals (1990) 35(2): 49-52, 2000

Procedure for successful interspecific embryo transfer from mouflon (Ovis gmelini musimon) to Spanish Merino sheep (Ovis aries). Journal of Zoo and Wildlife Medicine: Official Publication of the American Association of Zoo Veterinarians 32(3): 336-341, 2001

A comparative study of anatomical characteristics of bones of mouflon Ovis musimon and domestic sheep Ovis aries. Veterinaria (Sarajevo): 371: 15-23, 1989

Hybridization of mouflon (Ovis musimon) with domestic sheep (Ovis aries), and its adverse effect on wildlife management. Veterinaria, Yugoslavia 38(1-2): 139-145, 1989

Bastardization of mouflon Ovis musimon and domestic sheep Ovis aries - an occurrence detrimental to wildlife economy. Veterinaria (Sarajevo): 381-2: 139-145, 1989

Hemoglobins of the Corsico-Sardinian Mouflon (Ovis musimon) and their implications for the origin of Hb A in domestic sheep (Ovis aries). Annales de Genetique et de Selection Animale 10(4): 503-506, 1978

Seasonal variation in sperm freezability associated with changes in testicular germinal epithelium in domestic (Ovis aries) and wild (Ovis musimon) sheep. Reproduction Fertility and Development 31(10): 1545-1557, 2019

Blood groups and evolutionary relationships among domestic Sheep (Ovis aries), domestic Goat (Capra hircus), Aoudad (Ammotragus lervia) and european Mouflon (Ovis musimon). Annales de Genetique et de Selection Animale 12(2): 169-180, 1980

The sequence and phylogenesis of the ?-globin genes of Barbary sheep (Ammotragus lervia), goat (Capra hircus), European mouflon (Ovis aries musimon) and Cyprus mouflon (Ovis aries ophion). Comparative Biochemistry and Physiology. Part D Genomics and Proteomics 4(3): 168-173, 2009

Enzootic occurrence of keratoconjunctivitis in the Mediterranean mouflon Ovis gmelini musimon x Ovis sp in the Caroux-Espinouse mountain massif Herault, during Autumn 1993 Lenzootie de kerato-conjonctivite chez le mouflon Mediterraneen Ovis gmelini musimon x Ovis sp du massif du Caroux-Espinouse Herault a LAutomne 1993. Gibier Faune Sauvage. Decembre; 144: 569-584, 1997