Suppression de la chute estivale de la production du poil chez la lapine angora par la pose d'implants de mélatonine

Rougeot, J.; Thébault, R. G.; Allain, Daniel

doi:10.1051/animres:19860405

Cited by 6 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Such results corroborate the hypothesis according to which the seasonal period of increased day length leads to a decrease in wool production via decreasing hair follicle activity [13]. These findings are similar to previous observations made with French angora does [1,15] treated with melatonin in spring. The melatonin treatment administered during long days exerted an effect opposite to the length of daylight; therefore, the number of wool fibres per follicle group increased in relation to that recorded in the control group.…”

Section: Discussionsupporting

confidence: 92%

“…The ROAN procedure [14] was used for the staining of the sections. The histological evaluation procedure was performed with a light microscope by counting 10-20 hair follicle groups per sample and determining the following parameters: (1) the number of hair follicles in anagen and telogen phases (lateral primaries and secondaries) in the central hair follicle group; (2) the proportion of growing fibres per follicle group in relation to the total number of hair fibres in the follicle group [1,15,18].…”

Section: Skin Histological Examination/proceduresmentioning

confidence: 99%

“…In summer the adverse effects of both long day length and hot conditions are simultaneously present. In the defleeced angora does of the French strain the decrease in wool production during summer can be prevented by means of melatonin treatment [2,15]. The endocrine control of seasonal changes in body weight, feed intake and hair follicle cycle is complex, but several studies have shown that the photoperiodism is the main regulating factor acting on fibre growth and moulting periods [3][4][5]9].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The effects of melatonin treatment on wool production and hair follicle cycle in angora rabbits

et al. 2001

View full text Add to dashboard Cite

-The aims of this study were to examine the effect of melatonin treatment on (1) the quantity of wool production and fibre quality traits, (2) feed consumption and body weight and (3) hair follicle activity in the German angora rabbits. The study involved 106 male and female angora rabbits (raised under natural photoperiod), between the initial ages of 200-210 days. Half of the stock was treated with melatonin (36 mg per rabbit) either in May prior to the summer solstice, or in July subsequent to the solstice. Other animals served as untreated controls. In May two methods of wool harvesting: defleecing or shearing, were tested, while in July two different intervals between wool harvests, 98 and 80 days, were compared. Skin samples were taken from May onwards six times during the experimental period. Melatonin treatment increased significantly total wool production (by 17.7%, P < 0.01), weight of first grade wool (by 14.1%, P < 0.01), fibre length (by 5.6%, P < 0.001), wool production per day (by 17.3%, P < 0.01) and per kg of live weight (by 14.6%, P < 0.05). The melatonin treatment also led to a significant increase in feed consumption and body weight during the first weeks following melatonin treatment. Melatonin treatment did not exert any significant effect on the content of the different fibre types, or on bristle dimensions (area and diameter), but resulted in a 32% (P < 0.001) increase in the number of active follicles (lateral primaries and secondaries) per hair follicle group. The date of treatment had a significant influence on the quantity of first grade wool with higher production observed only when animals are treated in July. The treatment proved to be more effective in the defleeced rabbits than in the shorn ones. melatonin / angora rabbit / wool production / fibre characteristic/ hair follicle activity Résumé -Effets de la mélatonine sur la production de laine et le cycle d'activité des follicules pileux chez le lapin angora. Cette étude avait pour but d'examiner les effets de la mélatonine (1) sur la morphologie des fibres et la production pondérale de laine, (2) sur le poids vif et l'ingestion de J. Lanszki et al. 80

show abstract

Section: Discussionsupporting

confidence: 92%

Section: Skin Histological Examination/proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The effects of melatonin treatment on wool production and hair follicle cycle in angora rabbits

et al. 2001

View full text Add to dashboard Cite

show abstract

“…T4 can promote re-epithelialisation and angiogenesis in wounded human skin ex vivo. MTL is related to the seasonal growth of wool; after implantation of melatonin, it can promote the early maturation of fur (Allain and Rougeot,1980;Rougeot et al,1986;Allain and Thébault, 1988). IGF-1 elicits extensive anabolic effects in various tissues, plasma concentrations of IGF-1 increase significantly with increasing nutrient intake, and the circulating IGF-1 concentrations are sensitive to nutritional changes (Smith et al, 2002).…”

Section: Effects Of Dietary Supplementation With Taurine On Serum Hormone Levelmentioning

confidence: 99%

Effects of dietary supplementation with taurine on production performance of Angora rabbits

et al. 2021

View full text Add to dashboard Cite

This study aimed to evaluate the effects of dietary supplementation with taurine on production performance, serum biochemistry, immunoglobulin, antioxidant and hormones of Angora rabbits. A total of 160 8-month-old Angora rabbits with similar body weight were randomly assigned to one of four dietary groups, with 40 animals per group. The dietary groups consisted of the following different taurine supplementation levels: 0 (control), 0.1, 0.2, and 0.3% (air-dry basis). The 73-d feeding trial (from July 31 to October 11, 2016 in China) included a 7-d adjustment period and a 66-d experimental period. The results showed that taurine dietary supplementation had effects on feed consumption, hair follicle density and wool yield of the Angora rabbits (P<0.05), and adding 0.2% taurine could improve the wool yield. Compared with the control group, serum total cholesterol and low-density lipoprotein levels in supplemented groups were decreased (P<0.05). Dietary supplementation with taurine could improve the activity of superoxide dismutase, enhance total antioxidant capacity and reduce the content of malondialdehyde in serum (P<0.05). Besides, the serum level of thyroid (T4) hormone and insulin-like growth factor-1 in experimental groups was higher than that in the control group (P<0.05). In conclusion, taurine dietary supplementation could reduce the lipid metabolism, enhance the antioxidant capacity and hormone level of Angora rabbits, and adding 0.2% taurine could achieve the effect of increasing wool production.

show abstract

Effect of constant-release melatonin implants and prolonged exposure to a long day photoperiod on prolactin secretion and hair growth in mouflon (Ovis gmelini musimon)

Santiago-Moreno¹,

López-Sebastián²,

Campo³

et al. 2004

Domestic Animal Endocrinology

View full text Add to dashboard Cite

Suppression de la chute estivale de la production du poil chez la lapine angora par la pose d'implants de mélatonine

Cited by 6 publications

References 0 publications

The effects of melatonin treatment on wool production and hair follicle cycle in angora rabbits

The effects of melatonin treatment on wool production and hair follicle cycle in angora rabbits

Effects of dietary supplementation with taurine on production performance of Angora rabbits

Effect of constant-release melatonin implants and prolonged exposure to a long day photoperiod on prolactin secretion and hair growth in mouflon (Ovis gmelini musimon)

Contact Info

Product

Resources

About