The effect of nutrition on the neural mechanisms potentially involved in melatonin-stimulated LH secretion in female Mediterranean goats

Zarazaga, L.A.; Celi, I.; Guzmán, José Luis; Malpaux, Benoît

doi:10.1530/joe-11-0225

Cited by 21 publications

(14 citation statements)

References 37 publications

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“…Our group has described the interaction between nutrition and exogenous melatonin to affect LH secretion in female goats (Zarazaga et al, 2011b). In the former experiment we observed an increase in LH concentrations in ovariectomized females implanted with melatonin that showed low BW/BCS induced by a lower level of nutrition.…”

Section: Introductionmentioning

confidence: 84%

The reproductive performance of female goats treated with melatonin is not improved after introduction to bucks displaying springtime sexual activity if these does are experiencing decreasing body weight/condition score

Zarazaga

Gatica

Gallego-Calvo

et al. 2017

Animal Reproduction Science

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Title: The reproductive performance of female goats treated with melatonin is not improved after introduction to bucks displaying springtime sexual activity if these does are experiencing decreasing body weight/condition score Authors: L.A. Zarazaga, M.C. Gatica, L. Gallego-Calvo, J.L. Guzmán PII:S0378-4320 (16) This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Highlights Reproductive activity of bucks is reduced in spring when male effect is used.  The response to the male effect decreases when females have an inadequate food supply.  Melatonin might reduce the negative effect of decreasing body weight-condition score.  Greater fecundity, fertility and productivity were observed in gain-melatonin does.  Plasma glucose and IGF-1 concentrations could explain the better reproductive results.3 AbstractThe aim of the present work was to determine whether treatment with melatonin modifies the reproductive response of female goats experiencing increasing or decreasing body weight (BW)/body condition score (BCS) when introduced to bucks displaying springtime sexual activity. During natural anoestrus, 53 does were isolated from bucks for a period of 42 days and distributed into two groups: 1) low BW/low BCS animals (N=24) (LLg group), which were fed 1.9 times their maintenance requirements so they would experience increasing BW and BCS; and 2) high BW/high BCS animals (N=29) (HHl group), which were fed 0.4 times their maintenance requirements so they would experience decreasing BW and BCS. Half of each group was treated, or not, with melatonin (LLg+Mel N=12, HHl+Mel N=15, LLg-Mel N=12 and HHlMel N=14). On 6th May they were introduced to six males, showing natural sexual activity, fitted with marking harnesses (thus permitting the detection of oestrous activity). The ovulation rate was assessed by transrectal ultrasonography and confirmed via the plasma progesterone concentration (measured twice per week in blood samples). Plasma glucose, IGF-1 and non-esterified fatty acid concentrations were also determined, along with the conception rate, fertility, prolificacy and productivity of the does. LH concentrations and LH pulsatility were also recorded in the hours around introduction to the males. 'Oestrous plus ovulation' was observed only in does treated with melatonin. A higher conception rate and greater fertility and productivity were observed among the LLg+Mel does. These females showed higher glucose and IGF-1 concentrations after the introduction of the males. LH concentrations increased after male introduction independent of all other conditions. In conclusion, the present results show that treatment w...

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Section: Introductionmentioning

confidence: 84%

The reproductive performance of female goats treated with melatonin is not improved after introduction to bucks displaying springtime sexual activity if these does are experiencing decreasing body weight/condition score

Zarazaga

Gatica

Gallego-Calvo

et al. 2017

Animal Reproduction Science

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“…These studies could not, therefore, differentiate between the effects of BCS and BW. Similarly, in other experiments in goats in which the effect of nutrition on reproductive activity was studied (Zarazaga et al, 2005(Zarazaga et al, , 2011a(Zarazaga et al, , 2011b(Zarazaga et al, , 2011c, the level of nutrition induced differences in BCS and BW, so again their separate effects could not be distinguished. In the present experiment, animals with different BCS were selected, but these were also separated into groups of different BW; this helped differentiate between the effect of these variables on breeding activity over the year.…”

Section: Discussionmentioning

confidence: 94%

Role of body condition score and body weight in the control of seasonal reproduction in Blanca Andaluza goats

Gallego-Calvo

Gatica

Guzmán

et al. 2014

Animal Reproduction Science

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The reproductive activity of 84 female Blanca Andaluza goats was monitored over 17 months to determine the role of body condition score (BCS) and body weight (BW) in its control. Following a 3x2 factorial experimental design, the animals were allocated to three groups: low BCS (≤2.50, n=24), medium BCS (BCS=2.75-3.00, n=31) and high BCS (≥3.25, n=29). The same animals, irrespective of their BCS group membership, were also divided into two groups depending on their BW: low BW (≤40 kg, n=44) and high BW (>40 kg, n=40). Oestrus was tested daily using vasectomized males. The ovulation rate was assessed by transrectal ultrasonography after the identification of oestrus. Ovulatory activity was determined by monitoring the plasma progesterone concentration weekly. BCS and BW were recorded once a week and their nutrition adjusted to maintain the initial differences between the groups. Both BCS and BW had a significant (at least P<0.05) influence on the onset, the end, and the duration of the breeding season, with longer periods of reproductive activity recorded in does with a BCS of ≥2.75 and BW of >40kg. No significant interaction between these variables was observed. Some 11.7% of the does in the groups with animals of BCS≥2.75 showed ovulatory activity during seasonal anoestrus. None of the does with a BCS of ≤2.5 showed this. The ovulation rate of the first and last oestrous was modified by BW (P<0.01). These results demonstrate that Blanca Andaluza goats show marked reproductive seasonality that is clearly and independently modulated by BCS and BW.

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“…Reproductive activity in goats shows an annual pattern, with long days inhibiting ovarian activity and short days stimulating it (Zarazaga et al, 2011). The evidence suggests that as day length decreases during autumn, an increase in the duration of secretion of melatonin triggers an endocrine response, leading to the onset of reproductive activity (Chemineau et al, 1987).…”

Section: Discussionmentioning

confidence: 99%

Effects of melatonin implantation during the slow period of cashmere growth on fibre production

Duan¹,

Jh²,

Zhang³

et al. 2016

SA J. An. Sci.

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This study was conducted to investigate the effects of melatonin implantation during the slow period of cashmere growth on fibre production in Inner Mongolian cashmere goats. It was found that melatonin implantation had no effect on the growth rate of cashmere, except from February to March when the rate of treated goats (0.16 mm/d) was significantly higher than that of control goats (0.06 mm/d). However, although melatonin administration delayed the rate of decline in cashmere growth rate for one month, there was no significant increase in cashmere production in melatonin-treated goats. It is evident that melatonin implantation during the slow period of growth cannot be used to prolong cashmere growth in Inner Mongolian cashmere goats. ______________________________________________________________________________________

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The effect of nutrition on the neural mechanisms potentially involved in melatonin-stimulated LH secretion in female Mediterranean goats

Cited by 21 publications

References 37 publications

The reproductive performance of female goats treated with melatonin is not improved after introduction to bucks displaying springtime sexual activity if these does are experiencing decreasing body weight/condition score

The reproductive performance of female goats treated with melatonin is not improved after introduction to bucks displaying springtime sexual activity if these does are experiencing decreasing body weight/condition score

Role of body condition score and body weight in the control of seasonal reproduction in Blanca Andaluza goats

Effects of melatonin implantation during the slow period of cashmere growth on fibre production

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