Melatonin-improved reproductive performance in sheep bred out of season

deNicolo, G.; St, Morris; Kenyon, P. R.; Morel, P. C. H.; Parkinson, T. J.

doi:10.1016/j.anireprosci.2007.10.012

Cited by 33 publications

(21 citation statements)

References 23 publications

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“…The mean estrous response was 85.1 %. These results are similar to the findings of other researchers [10,11]. The ovarian sensitivity to hormonal manipulation may be different individually during anoestrous period.…”

supporting

confidence: 82%

The Effect of Injectable Vitamin E and Trace Minerals (Selenium, Calcium, Phosphate, Copper, and Cobalt) on Reproductive Performance During Non-Breeding Season in Awassi Ewes

Zonturlu¹,

Kaçar²,

Sönmez³

et al. 2017

S-h. biol.

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A b s t r a c tProgesterone in combination with pregnant mare serum gonadotropin (PMSG) is widely used to synchronize estrus in ewes. It is also known that various minerals and vitamins are necessary to provide animal reproductive health, and their blood level is reliably associated with reproductive performance. The objective of our research was to determine the effects of supplementation of vitamin E and mineral mixtures during progesterone treatment on reproductive performance of estrus-induced ewes during the non-breeding season. The present study was carried out between May and June, which is the period accepted as non-breeding season for ewes in Sanliurfa province of Southeast Turkey. A total of 148 non-lactating adult ewes of Awassi breeds in good body score condition, ranging in age from 2 to 4 years and weighting between 45 and 60 kg were used in this study. Estrus was synchronized in all ewes using the intravaginal sponges containing 20 mg fluorogestone acetate. The intravaginal sponges were inserted into vagina of each ewe for 14 days. At the time of sponge withdrawal (day 0), all ewes were injected intramuscularly with 10 IU/kg of PMSG for stimulation of estrus and ovulation. Treatment group (n = 74) received orally supplementation of vitamin E and mineral mixtures (Bakosel ® capsule; Ceva Dif, Istanbul, Turkey; a capsule contains 500 IU vitamin E acetate, 2.5 mg sodium selenite, 150 mg dicalcium phosphate, 10 mg copper sulphate, 12.5 mg cobalt sulphate) at the four times a week apart during progestagen treatment and at the time mated. The remaining ewes (n = 74) served as control group, and the each female in this group also received only placebo instead of vitamin and mineral supplementation. They were tested for pregnancy detection on day 40 after mating using real time ultrasonography with 5-7.5 MHz linear array rectal transducer. The estrus response was 87.8 % and 82.4 % for the treatment and control groups, respectively. The overall pregnancy rate was 71.4 % (90/126). The gestation length was similar between groups and it averaged 149.4±0.3 days. The lambing rate was 75.4 % (49/65) and 65.6 % (40/61) for the treatment and control groups, respectively. The number of multiple births (42.9 % versus 20.0 %) and prolificacy rate were higher (P < 0.05) for the treatment group than those of control group. It is concluded that vitamin E and the multi-trace minerals/bolus given to Awassi ewes 14 days before mating significantly increased the proficiency rate, the multiple births rates and led to stronger manifested estrus behaviors.

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supporting

confidence: 82%

The Effect of Injectable Vitamin E and Trace Minerals (Selenium, Calcium, Phosphate, Copper, and Cobalt) on Reproductive Performance During Non-Breeding Season in Awassi Ewes

Zonturlu¹,

Kaçar²,

Sönmez³

et al. 2017

S-h. biol.

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“…During the accelerated lambing systems (i.e., the Star system) developed to produce lambs all year round, low fertility was observed in spring and summer (Lewis et al, 1996). However, the system was shown to be successful and practical when sheep were induced to ovulate out of the breeding season (deNicolo et al, 2008b). Both seasonality and onset of puberty can be controlled by oestrus synchronisation protocols, which replicate physiological processes that occur during the natural breeding season.…”

Section: Introductionmentioning

confidence: 96%

Successful induction of oestrus, ovulation and pregnancy in adult ewes and ewe lambs out of the breeding season using a GnRH+progesterone oestrus synchronisation protocol

Martı́nez

McLeod²,

Tattersfield

et al. 2015

Animal Reproduction Science

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“…Melatonin is the main factor that initiates estrus during the breeding season of the yak (Huo and Long, 2014), and is involved in the control of reproduction (DeNicolo et al, 2008;Martinez-Royo et al, 2012). The ER located SR and SS of the pineal gland (Figure 2).…”

Section: Discussionmentioning

confidence: 99%

Protein and mRNA expression of estradiol receptors during estrus in yaks (Bos grunniens)

et al. 2015

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-The objective of this study was to investigate mRNA by real-time PCR and protein expression by immunofluorescence of the estradiol receptors (ER) in the pineal gland, hypothalamus, pituitary gland, and gonads of yaks (Bos grunniens). The analysis showed that the level of expression of ER mRNA was greater in the pituitary gland tissue than in other glands during estrus. Immunofluorescence analyses showed that ER proteins were located in the pineal cells, synaptic ribbon, and synaptic spherules of the pineal gland. In the hypothalamus, ER proteins were located in the magnocellular and parvocellular neurons. The ER proteins were located in acidophilic cells and basophilic cells in the pituitary gland. In the ovary, ER proteins were present in the ovarian follicle, corpus luteum and Leydig cells. Estradiol exerts its main effects on the pituitary gland during estrus in yak.

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Melatonin-improved reproductive performance in sheep bred out of season

Cited by 33 publications

References 23 publications

The Effect of Injectable Vitamin E and Trace Minerals (Selenium, Calcium, Phosphate, Copper, and Cobalt) on Reproductive Performance During Non-Breeding Season in Awassi Ewes

The Effect of Injectable Vitamin E and Trace Minerals (Selenium, Calcium, Phosphate, Copper, and Cobalt) on Reproductive Performance During Non-Breeding Season in Awassi Ewes

Successful induction of oestrus, ovulation and pregnancy in adult ewes and ewe lambs out of the breeding season using a GnRH+progesterone oestrus synchronisation protocol

Protein and mRNA expression of estradiol receptors during estrus in yaks (Bos grunniens)

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