Seasonal variation in hair follicle activity and fibre growth of both male and female Merghoz goats in Western Iran

Mirmahmoudi, R.; Souri, M.; Talebi, J.; Moghaddam, Aliasghar

doi:10.1016/j.smallrumres.2011.07.002

Cited by 5 publications

(4 citation statements)

References 32 publications

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“…In the current study, the population of primary hair follicles in the skin was the same for both melatonintreated and control cashmere goats and did not change over two consecutive cashmere growth cycles. This helps to con rm the view that the population of primary hair follicles in cashmere goats is established at birth and is not affected subsequently by treatment of adult cashmere goats with exogenous melatonin [8,[17][18][19]. In the case of secondary hair follicles, previous studies have also shown no effect of melatonin treatment on their total population, and thus no effect on S:P ratio [20,21].…”

Section: Discussionsupporting

confidence: 52%

Effects of melatonin administration to cashmere goats on cashmere production and hair follicle characteristics in two consecutive cashmere growth cycles

Yang

Duan

et al. 2021

Domestic Animal Endocrinology

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Section: Discussionsupporting

confidence: 52%

Effects of melatonin administration to cashmere goats on cashmere production and hair follicle characteristics in two consecutive cashmere growth cycles

Yang

Duan

et al. 2021

Domestic Animal Endocrinology

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“…Consequently, low ambient temperatures adversely affected the live weight gain of Angora rabbits. Previous studies have shown a strong correlation between body weight and wool production in Angora rabbits (Qinyu 1992;Singh et al, 2011). In this study, strong correlations were observed in spring (higher wool production and daily weight gain) and summer (lowest wool production and daily weight gain).…”

Section: Discussionsupporting

confidence: 69%

“…Sheep wool production is affected by genetic and nongenetic (e.g., environmental) factors (Mirmahmoudi et al, 2011;Winder et al, 2010). High temperature and humidity conditions affect wool production in Malpura ewes (Sejian et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

Optimum wool harvest interval of angora rabbits under organised farm conditions in East China

et al. 2019

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The present study was conducted to evaluate the commercial lifespan and optimum wool harvest interval of Angora rabbits. One hundred shorn Angora rabbits were housed in an organised farm to describe the wool production curve. It showed that the optimum wool harvest interval was 75 d, when fibre length reached 55.0 mm. Wool production was lower from the 3rd to the 6th mo (young stage) than from 7th to 28th mo and rapidly decreased from 28th to 31st mo and was the lowest from 31st to 33rd mo of age. Feed intake-to-wool production ratio was higher from 3rd to 4th and from 7th to 9th mo of age than during the adult stage, and increased from 31st to 33rd mo of age. Daily weight gain was significantly higher from 3rd to 4th mo of age than in any other periods of the adult stage, and was negative from 23rd to 33rd mo of age. Therefore, the study reveals that the commercial lifespan of Angora rabbits was approximately 28 mo. Furthermore, wool production was higher in spring and winter than in autumn, and was the lowest in summer. Concomitantly, feed intake-to-wool production ratio was lower in spring than in autumn and winter, and was the highest in summer. Finally, daily weight gain was higher in spring and autumn than in winter, and was the lowest in summer. This indicates that wool production was depending on the season, and decreased significantly in summer. Moreover, the spring provided the best conditions for Angora rabbits.

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“…While previous studies have shown that melatonin production in horses is acutely suppressed by light [17], significant individual variation in night-time production levels were observed [35]. Additionally, different thermoregulatory requirements may cause hair growth and shedding to vary according to age, body region, breed and sex [36][37][38].…”

Section: Effectiveness Of Extending Photoperiod One Month Before the Winter Solsticementioning

confidence: 98%

The effects of extended photoperiod and warmth on hair growth in ponies and horses at different times of year

2020

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Photoperiod is considered the most dominant environmental cue allowing animals to anticipate and adapt to seasonal changes. In seasonally breeding mammals, changes in daylength alter pineal melatonin secretion and pituitary prolactin secretion. During the seasonal transition to shorter winter daylengths, increased production of melatonin and declining prolactin are associated with triggering winter coat growth in many animals. Similarly, studies have shown that artificial extension of photoperiod suppresses melatonin secretion and lifts prolactin inhibition to activate moulting. Four longitudinal cohort studies were conducted to determine if extended photoperiod and warmth, provided by mobile light masks and rugs (horse blankets), could reverse the onset of winter coat growth, maintain the summer coat and accelerate winter coat shedding in horses and in ponies. Studies began at dates corresponding to the autumnal equinox, one month post-summer solstice, one month pre-winter solstice and one month post-winter solstice, respectively. To extend photoperiod to approximately 15h of light, commercially available head-worn light masks provided low intensity blue light to one eye until 11pm daily. Coat condition and shedding rate were scored and hair samples collected, measured and weighed bi-weekly. Data from control and treatment groups were analysed by repeated measures ANOVA. Results revealed that extended photoperiod 1) did not reverse winter coat growth when initiated at the autumnal equinox, 2) effectively maintained the summer coat in stabled horses when initiated one month postsummer solstice, 3) accelerated shedding in outdoor living horses when initiated one month pre-winter solstice and 4) did not accelerate shedding in indoor or outdoor living ponies when initiated one month post-winter solstice. To successfully manage equine coat growth while also preserving optimal thermoregulation in both competition and breeding stock correct timing of light application is crucial and requires careful monitoring of environmental temperature. Further studies are needed where variations in breed and management are considered.

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Seasonal variation in hair follicle activity and fibre growth of both male and female Merghoz goats in Western Iran

Cited by 5 publications

References 32 publications

Effects of melatonin administration to cashmere goats on cashmere production and hair follicle characteristics in two consecutive cashmere growth cycles

Effects of melatonin administration to cashmere goats on cashmere production and hair follicle characteristics in two consecutive cashmere growth cycles

Optimum wool harvest interval of angora rabbits under organised farm conditions in East China

The effects of extended photoperiod and warmth on hair growth in ponies and horses at different times of year

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