hCG treatment on day of mating improves embryo viability and fertility in ewe lambs

Khan, Tasawar Hussain; Hastie, P.M.; Beck, N. F. G.; Khalid, M.

doi:10.1016/s0378-4320(02)00194-x

Cited by 44 publications

(38 citation statements)

References 16 publications

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“…On the other hand, GnRH injection on day of mating support the luteinization of developing follicles, to increase in LH and improved luteal function (Beck et al 1996). In this way, GnRH stimulates the development of embryo and its implantaion (Khan et al 2007) likewise hCG injections at the time of mating increases embryo viability and fertility (Khan et al 2003). Consequently, the present study aimed to investigate the effect of GnRH injections on the day of mating and 9 days after mating on pregnancy rate, litter size and oestrus synchronization in the Awassi ewes receiving long-term progesterone during breeding season.…”

Section: Introductionmentioning

confidence: 99%

Effect of double GnRH injections on reproductive parameters in Awassi ewes receiving long-term progesterone

Zonturlu

Kaçar

Kaya

et al. 2018

Journal of Applied Animal Research

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The aim of this study was to investigate the effect of single or double Gonadotropin releasing hormone (GnRH) injections at the time of mating and following on day 9 on pregnancy rates and litter size in ewes. Oestrus was synchronized in 130 adult ewes using intravaginal sponges containing 20 mg of fluorogestone acetate for 14 days. All ewes received 10 IU/kg of pregnant mare serum gonadotropin (PMSG) at the sponge withdrawal. Then animals were divided into three groups. Ewes in group 1 (G1; Control, n = 68) received 1 ml placebo injection. In group 2 (G2; n = 30), ewes in oestrus were treated with 1 ml GnRH (4 μg/ml) at the time of mating. In group 3 (G3; n = 32), ewes were injected 1 ml GnRH not only at the time of mating but also on day 9 post-mating. There was significantly higher in duration of oestrus G1 compared with the G2 and G3. Pregnancy rate was found to be higher in G3 (96.0%) than in G1 (72.7%) and G2 (83.3%). The litter size was significantly higher for G3 (1.26 ± 0.14) in comparison with the G1 (1.18 ± 0.07) and G2 (1.22 ± 0.10). In conclusion, Post-mating GnRH injection enhanced the pregnancy rate and litter size, because of its beneficial effects on embriyo viability by increasing luteal formations. ARTICLE HISTORY

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Section: Introductionmentioning

confidence: 99%

Effect of double GnRH injections on reproductive parameters in Awassi ewes receiving long-term progesterone

Zonturlu

Kaçar

Kaya

et al. 2018

Journal of Applied Animal Research

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“…However, the recovery of embryo from the oviduct improves the reliability of superovulatory treatment, making it nearly twice as reliable. The combination of embryo recovery from the oviduct and the combination of simple procedures like the application of growth hormone (Folch et al, 2001) or hCG (Khan et al, 2003) can improve embryo viability and increase sheep production through MOET programs.…”

Section: Discussionmentioning

confidence: 99%

Embryo recovery from the oviduct in superovulated ewes: a method to improve MOET systems

Ramón-Ugalde¹,

Folch

Cocero

et al. 2008

CZECH J ANIM SCI

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ABSTRACT:The efficiency of embryo recovery in a superovulatory treatment was studied by perfusing the oviduct or the uterine horn in 3.5 and 7 days after sponge withdrawal, respectively. Eighty-four and seventy ewes of Aragonesa breed were used as embryo donors and receptors, respectively. The donors were distributed in 3 replications. The oestrus was synchronized with the insertion of FGA intravaginal sponges (30 mg) for 13 days. Six intramuscular injections of 18 mg pFSH were applied in decreasing doses at 12 hour intervals starting 48 hours after sponge withdrawal. The recovery rate (RR) (83.2 vs. 75.8%), the viability rate (VR) (73.5 vs. 47.2%) and the number of viable embryos (VE) per donor ewe (5.9 ± 0.79 vs. 3.0 ± 0.37) were higher (P < 0.01) in ewes whose perfusion was done directly in oviducts. The interval from sponge withdrawal to oestrus had no influence on RR in any groups; however it had an effect on the VR in 3.5 and 7 days old embryos. Embryos from ewes showing the oestrus within 20 hours after sponge withdrawal had a higher viability. On the other hand, using morphologic criteria, 26.5% and 52.7% of 3.5 and 7 days old embryos, respectively, were discarded before transfer. The percentage of ewes in each group that became pregnant was similar in both groups. We conclude that in superovulated ewes the embryo recovery rate, viability and number of viable embryos are higher in embryos recovered from the oviduct compared to those recovered from the uterus, without decreasing the conception rate and the viability rate is higher in ewes that show the oestrus 20 hours before sponge withdrawal.

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“…Administration of hCG or GnRH on the day of mating and on various days post mating have been reported (Khan et al, 2003). It h a s been reported t h a t hCG administration can stimulate conceptus growth in uterus, as determined on day 13 (Thatcher et al, 2001) and on day 25 (Khan et al, 2003). Hence this study was performed t o compare histological changes of endometrium in non pregnant, pregnant, pseudopregnant and hCG treated rat at preimplantation stage.…”

Section: Introductionmentioning

confidence: 98%

“…The timing of such hormonal treatments also seems t o be important. Administration of hCG or GnRH on the day of mating and on various days post mating have been reported (Khan et al, 2003). It h a s been reported t h a t hCG administration can stimulate conceptus growth in uterus, as determined on day 13 (Thatcher et al, 2001) and on day 25 (Khan et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Effect of hCG on Rat Endometrium at Preimplantation Stage

Gholami¹,

Jelodar

Alborzinia³

2008

Journal of Applied Animal Research

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hCG treatment on day of mating improves embryo viability and fertility in ewe lambs

Cited by 44 publications

References 16 publications

Effect of double GnRH injections on reproductive parameters in Awassi ewes receiving long-term progesterone

Effect of double GnRH injections on reproductive parameters in Awassi ewes receiving long-term progesterone

Embryo recovery from the oviduct in superovulated ewes: a method to improve MOET systems

Effect of hCG on Rat Endometrium at Preimplantation Stage

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