JOURNAL BROWSE
Search
Advanced SearchSearch Tips
Reproductive Responses of Awassi Ewes Treated with either Naturally Occurring Progesterone or Synthetic Progestagen
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
 Title & Authors
Reproductive Responses of Awassi Ewes Treated with either Naturally Occurring Progesterone or Synthetic Progestagen
Husein, Mustafa Q.; Kridli, Rami T.;
  PDF(new window)
 Abstract
The objective was to identify the appropriate form of progesterone, which exhibits compact reproductive responses in Awassi ewes during mid to late seasonal anestrous period. Forty-eight Awassi ewes were randomly allocated into four groups to be treated with 60 mg medroxyprogesterone acetate (MAP), 30 mg fluorogestone acetate (FGA), 40 mg FGA, or 600 mg progesterone sponges. After a 12 day period, sponges were removed and ewes were administered i.m. with 600 IU PMSG (d 0, 0 h). Five harnessed Awassi rams were turned-in with the ewes to detect heat. Ewes were checked for breeding marks at 6 h intervals for 5 days. Blood samples were collected from all ewes for analysis of progesterone concentrations. Pretreatment (d -13 and -12) progesterone concentrations were among all ewes and were indicative of seasonal anestrous period. On d 0, progesterone concentrations were elevated to in ewes received progesterone sponges only and were higher (p<0.0001) than those () administered MAP or FGA sponges. Progesterone concentrations returned to their basal values of <0.2 ng/mL within 24 h of sponge removal and were similar (p>0.1) among all ewes. Incidence of estrus was similar (p>0.1) among the four groups and occurred in 75% (9/12), 82% (9/11), 67% (8/12) and 58% (7/12) of the ewes receiving MAP, 30 mg FGA, 40 mg FGA and progesterone sponges, respectively. Estrous responses occurred 14.7, 20 and 13.6 h earlier in progesterone-sponge-treated ewes than those of MAP- (p<0.04), 30 mg FGA- (p<0.01) and 40 mg FGA-treated (p=0.06) ewes, respectively. Induced estrus conception rates were 50% (6/12), 55% (6/11), 50% (6/12) and 42% (5/12), out of which 4/6, 4/6, 3/6 and 3/5 lambed 151 days following d 0, and were similar (p>0.1) among ewes of the four treatment groups. Ewes that returned to estrus 16 to 20 days following d 0 were 5/12, 5/11, 6/12 and 4/12 ewes treated with MAP, 30 mg FGA, 40 mg FGA and progesterone sponges, respectively, and all lambed 169 days later. Overall lambing rates were 75% (9/12), 82% (9/11), 75% (9/12) and 58% (7/12) ewes treated with MAP, 30 mg FGA, 40 mg FGA and progesterone sponges, respectively. Results demonstrate that applications of MAP, 30 mg FGA, 40 mg FGA and progesterone sponges Awassi ewes were equally effective in induction of estrus and tended to favor both types of FGA and MAP in overall lambing rates over progesterone sponges during the seasonal anestrous period.
 Keywords
Estrus Synchronization;Progesterone;MAP;FGA;Awassi Ewes;
 Language
English
 Cited by
 References
1.
Abdullah, A. Y., M. Q. Husein and R. T. Kridli. 2001. Protocols for estrus synchronization in Awassi ewes under badia conditions. Asian-Aust. J. Anim. Sci. 15(7):957-962.

2.
Baird, D. T. and A. S. McNeilly. 1981. Gonadotrophin control of follicular development and function during the estrous cycle of the ewe. J. Reprod. Fertil. (Suppl.). 30:119-133.

3.
Boland, M. P. and I. Gordon. 1973. Oestrus and ovulatory response to progesterone-PMSG treatments in anoestrous ewes. J. Dept. Agric. Fish., Ireland. 70:65-70.

4.
Crosby, T. F., M. P. Boland and I. Gordon. 1991. Effect of progestagen treatments on the incidence of estrus and pregnancy rates in ewes. Anim. Reprod. Sci. 24:109-118. crossref(new window)

5.
Cumming, I. A. 1977. Relationships in the sheep of ovulation rate with live weight, breed, season and plane of nutrition. Aust. J. Exp. Ag. Anim. Husb. 17:234-241. crossref(new window)

6.
Cunningham, N. F., N. Saba, C. S. H. Boarer and J. J. P. Hattersley. 1980. Plasma hormone levels and reproductive behavior in anestrous ewes after treatment with progesterone and PMSG. J. Reprod. Fertil. 60:177-185. crossref(new window)

7.
Dutt, R. H. 1953. Induction of estrus and ovulation in anestrual ewes by use of progesterone and pregnant mare serum. J. Anim. Sci. 12:515-523.

8.
Epstein, H. 1982. Awassi sheep. World Anim. Rev. 44:9-18.

9.
Faure, A. S., D. A. Boshoff and F. J. L. Burger. 1983. The effect of whole and halved intravaginal sponges combined with either subcutaneous or intravenous administration of PMSG on synchronization of the estrous cycle of Karakul ewes. S. Afr. J. Anim. Sci. 13:157-160.

10.
Fukui Y., M. Testuka, M. Akaike, K. Machiyama and H. Ono. 1987. Effects of type of vaginal sponge impregnated with progestogen on estrus induction and lambing rate in seasonally anestrous ewes. Jpn. J. Anim. Reprod. 33:181-187.

11.
Goddard, I. G. H. 1982. Sheep breeding in Jordan and a proposed Awassi breed improvement program. Increasing small ruminant productivity in semi-arid areas. ICARDA Ann. Rep. pp.181-188.

12.
Gordon, I. 1971. Induction of early breeding in sheep by standard and modified progestagen-PMS treatments. J. Agric. Sci. Camb. 76:337-341. crossref(new window)

13.
Hamra, A. H., J. W. McNally, J. M. Marcek, K. M. Karlson and J. E. Wheaton. 1989. Comparison of progesterone sponges, cronolone sponges and controlled internal drug release dispensers on fertility in anestrous ewes. Anim. Reprod. Sci. 18:219-226. crossref(new window)

14.
Haresign, W. 1978. Ovulation control in sheep. In: Control of Ovulation (Ed. D. B. Crighton, N. B. Haynes, G. R. Foxcroft and G. E. Lamming). First Ed. Butterworths, London. pp. 435-451.

15.
Husein, M. Q., M. M. Ababneh, B. G. Crabo and J. E. Wheaton. 1996. Out-of-season breeding of ewes using transcervical artificial insemination. Sheep and Goat Res. J. 12(1):39-45.

16.
Husein, M. Q., M. T. Bailey, M. M. Ababneh, J. E. Romano, B. G. Crabo and J. E. Wheaton. 1998. Transcervical artificial insemination of ewes out-of-season using frozen-thawed semen: effect of equine chorionic gonadotropin on pregnancy rate. Theriogenology 49:997-1005. crossref(new window)

17.
Husein, M. Q. and R. T. Kridli. 2001. Effect of progesterone priming on gonadotropin releasing hormone and prostaglandin F2$\alpha$ treated Awassi ewes. Small Rumin. Res. (Submitted).

18.
Killeen, I. D. and N. W. Moore. 1970. The effect of pregnant mare serum gonadotrophin and human chorionic on ovulation and on fertility in the ewe. Aust. J. Agric. Res. 21:807-814. crossref(new window)

19.
Leagan, S. J., H. I'Anson, P. Fitzgerald and M. S. Akaydin. 1985. Importance of short luteal phase in the endocrine mechanism controlling initiation of estrous cycle in anestrous ewes. Endocrinology 117(4):1530-1536. crossref(new window)

20.
Lubbadeh, W. F. 1986. The use of progesterone and PMSG in the control of estrus and twinning in Awassi sheep. Dirasat. Vol (xiii):85-91.

21.
MacDonnel, J. F. and J. P. Crowley. 1978. The effect of progesterone impregnated sponges on fertility in anoestrous ewes. Vet. Sci. Comm. 2:115-130. crossref(new window)

22.
Oldham, C. M. and G. B. Martim. 1978. Stimulation of seasonally anovular merino ewes by rams. II. Premature regression of ram-induced corpora lutea. Anim. Reprod. Sci. 1:291-295. crossref(new window)

23.
Quirke, J. F., J. P. Hanrahan and J. P. Gosling. 1981. Duration of estrus, ovulation rate, time of ovulation and plasma LH, total estrogen and progesterone in Galway adult ewes and ewe lambs. J. Reprod. Fertil. 61:265-272. crossref(new window)

24.
Robinson, T. J. 1979. Controlled breeding of sheep and goats. In: Sheep Breeding (Ed. G. J. Tomes, D. E. Robertson, R. J. Lightfoot and W. Haresign). Second ed. Butterworths. London pp. 439-449.

25.
Robinson, T. J. and N. W. Moore. 1967. The evaluation of progesterone an sc-9980 impregnated intravaginal sponges for synchronization of oestrus for large scale artificial insemination of merino ewes in spring. Paper VIII in 'The control of the ovarian cycle in sheep'. (Ed. T. J. Robinson). Sydney Univ. Press.

26.
SAS Institute Inc. 1990. SAS/STAT guide to personal computers (Version 6, 4th ed). SAS Inst. Inc. Cary, NC. USA.

27.
Shackell G. H. 1991. The timing of estrus, LH surge and ovulation in ewes following synchronization with MAP sponge FGA sponge or CIDR's. Proc. New Zealand Soc. Anim. Prod. 51:73-77.

28.
Shelton, J. N., T. J. Robinson and P. J. Holst. 1967. The evaluation of several progestagen treatments in the spayed ewe. In: The control of the ovarian cycle in the sheep. Sydney Univ. Press, Sydney, pp. 14-38.

29.
Simonetti, L., M. R. Blanco and J. C. Gardon. 2000. Estrus synchronization in ewes treated with sponges impregnated with different doses of medroxyprogesterone acetate. Small Rumin. Res. 38:243-247. crossref(new window)