Asian-Australasian Journal of Animal Sciences

  • 제15권7호
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  • Pages.957-962
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  • 2002
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  • 1011-2367(pISSN)
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  • 1976-5517(eISSN)
아세아태평양축산학회 (Asian Australasian Association of Animal Production Societies)
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Protocols for Estrus Synchronization in Awassi Ewes under Arid Environmental Conditions

  • Abdullah, A.Y. (Department of Animal Production, Faculty of Agriculture Jordan University of Science and Technology) ;
  • Husein, M.Q. (Department of Animal Production, Faculty of Agriculture Jordan University of Science and Technology) ;
  • Kridli, R.T. (Department of Animal Production, Faculty of Agriculture Jordan University of Science and Technology)
  • 발행 : 2002.07.01
⟨ 이전 논문 다음 논문 ⟩

초록

In July, three trials were conducted to evaluate the best sponge type and optimum PMSG dose to be administered to sheep under the Jordanian Badia (arid) conditions. In trial 1, three flocks (n=77, n=18 and n=47 for flocks 1, 2 and 3, respectively) were administered with 40 mg fluorogestone acetate (FGA) intravaginal sponges for 12 days before receiving 600 IU of PMSG at the time of sponge removal. In trial 2, 95 ewes were assigned to 4 groups to receive 300 (n=25), 450 (n=27), 600 (n=22) or 750 (n=21) IU of PMSG following a 12 d FGA 40 mg sponge insertion period. In trial 3, 60 ewes were assigned to 3 groups (n=20) to receive either FGA 30 mg, FGA 40 mg or medroxyprogesterone acetate (MAP) 60 mg intravaginal sponges all followed by an administration of 600 IU of PMSG at sponge removal. In all trials, rams were isolated 1 day before sponge insertion and were allowed back with the ewes at sponge removal. Estrual responses and lambing data were collected. The effects of treatment, milking status and face color on estrual responses and lambing data were examined. In trial 1, greater first cycle conception rate (p<0.05), twinning rate (p<0.01) and the number of lambs born/served ewe (p<0.01) were observed in flock 2 compared with flocks 1 and 3. Neither face color nor milking status had any influence on the measured parameters (p>0.05). Despite low lambing rate in trial 2, ewes receiving 600 IU of PMSG had greater (p<0.05) number of lambs born/served ewe compared with ewes receiving 450 IU of PMSG. Regardless of PMSG dose, intervals to detected estrus occurred 10 h earlier (p<0.01) in dry than lactating ewes. Similar to trial 2, lambing rate was depressed in trial 3. The expression of estrus was advanced (p<0.05) in ewes receiving MAP 60 mg sponges compared with those receiving FGA 30 and FGA 40 mg sponges (42$\pm$3.1, 49$\pm$3.1 and 49$\pm$3.1 h post sponge removal in ewes receiving MAP 60 mg, FGA 30 mg and FGA 40 mg sponges, respectively). Other parameters were not influenced (p>0.05) by sponge type, milking status and face color. Data show that a 600 IU dose of PMSG tends to give the best lambing results. In addition, results indicate that the use 60 mg MAP sponges for estrus synchronization may be more appropriate under the Jordanian Badia conditions during late seasonal anestrus.

키워드

참고문헌

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피인용 문헌

  1. Effect of Progesterone Prior to GnRH-PGF2alpha Treatment on Induction of Oestrus and Pregnancy in Anoestrous Awassi Ewes vol.38, pp.3, 2003, https://doi.org/10.1046/j.1439-0531.2003.00411.x
  2. Hormonal treatments and the ram effect on synchronised oestrus in Awassi ewes at the beginning of the breeding season vol.48, pp.4, 2005, https://doi.org/10.1080/00288233.2005.9513681
  3. Age at Puberty and Some Biological Parameters of Awassi and its First Crosses with Charollais and Romanov Rams vol.5, pp.2, 2006, https://doi.org/10.4081/ijas.2006.193
  4. Awassi sheep reproduction and milk production: review vol.43, pp.7, 2011, https://doi.org/10.1007/s11250-011-9858-5
  5. Effect of fluorogestone acetate and eCG on reproductiveparameters in lactating Pırlak ewes vol.41, pp.13036181, 2017, https://doi.org/10.3906/vet-1611-39
  6. Reproductive performance and milk yield in Awassi ewes following crossbreeding vol.71, pp.1, 2002, https://doi.org/10.1016/j.smallrumres.2006.05.007
  7. A new strategy for superior reproductive performance of ewes bred out-of-season utilizing progestagen supplement prior to withdrawal of intravaginal pessaries vol.69, pp.3, 2002, https://doi.org/10.1016/j.theriogenology.2007.10.005
  8. The effect of estrus synchronization programmes on parturition time and some reproductive characteristics of Saanen goats vol.44, pp.1, 2002, https://doi.org/10.1080/09712119.2015.1091348
  9. Estrous synchronization in ewes: The use of progestogens and prostaglandins vol.68, pp.4, 2002, https://doi.org/10.1080/09064702.2019.1674373