Estrous synchronization in ewes: The use of progestogens and prostaglandins

Yu, Xiaojie; Wang, J.; Bai, Y. Y.

doi:10.1080/09064702.2019.1674373

Cited by 10 publications

(10 citation statements)

References 73 publications

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“…At present, there are many hormonal schemes for synchronization of estrus in sheep, such as progestogen vaginal sponge, prostaglandin (PG), and its structural analogs by intramuscular injection ( 13 , 14 ). The progestogens that have been used include progesterone (P 4 ), fluorogestone acetate (FGA), and medroxyprogesterone acetate (MAP).…”

Section: Introductionmentioning

confidence: 99%

Comparison of Five Protocols of Estrous Synchronization on Reproductive Performance of Hu Sheep

Bai

Yang

et al. 2022

Front. Vet. Sci.

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The purpose of this study is to compare five protocols of estrous synchronization for Hu ewes to obtain the most effective and economical protocol, to apply the advantageous scheme in large-scale sheep farming. Healthy multiparous Hu ewes (n = 150) were randomly divided into five groups, and all ewes were administered fluorogestone acetate (FGA, 45 mg) vaginal sponge. The sponges of the first three groups (Groups I, II, and III) were removed on the 11th day, and 0.1 mg of PGF2α was injected intramuscularly on the ninth day. Group I received 6 μg of gonadotropin-releasing hormone (GnRH) by intramuscular injection at 36th h after withdrawal of the sponge. Group II was injected 330 IU of pregnant mare serum gonadotropin (PMSG) on the ninth day. The combination of 6 μg of GnRH and 330 IU of PMSG was treated in Group III at the same time as Group I and Group II. The sponges of the latter two groups (Groups IV and V) were removed on the 13th day, and 330 IU of PMSG was injected intramuscularly simultaneously. PGF2α (0.1 mg) was administered on the 12th day in Group IV. All ewes were detected for estrus at 24, 36, 48, 60, and 72 h after the sponge removal. The loss of sponge and vaginitis was recorded when the sponge was withdrawn. Cervical artificial insemination (AI) was performed with fresh semen of Dorper rams diluted with skimmed milk. After 30 days of insemination, the conception was detected with a veterinary B-ultrasound scanner. The lambing status of all ewes and the cost of drugs for estrous synchronization in each group were recorded. The results showed the following: (1) on the whole, the average percentage of estrous ewes in the period of 24–36 h and 36–48 h after removal was significantly higher than other three periods and that of the period of 60–72 h was significantly lower than the first three periods after removal; (2) there was no significant difference in percentages of estrous ewes in any of the five time periods, sponge loss rate, vaginitis rate, total percentage of estrous ewes, conception rate, single lambing rate, twinning rate, and multiple lambing rate of ewes among five protocols; (3) total percentage of estrous ewes and conception rate were more than or equal to 80% in the Groups II and III, and the twinning lamb rate of the Group II protocol was 70%; (4) there was no difference in lambing rate of ewes among Groups II, III, IV, and V; (5) the Group III had the highest drug cost of 22.5 CNY. In conclusion, considering the lambing rate, twinning lamb rate, and drug cost for estrous synchronization, Group II was the most advisable for application and promotion in large-scale sheep farms among these five protocols of estrus synchronization.

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Section: Introductionmentioning

confidence: 99%

Comparison of Five Protocols of Estrous Synchronization on Reproductive Performance of Hu Sheep

Bai

Yang

et al. 2022

Front. Vet. Sci.

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“…• Using of intravaginal sponges or CIDR with progestogens, followed by or without parenteral administration of gonadotropins and prostaglandins (Cosentino, 2019;Dursun, 2019;Yu, Wang & Bai, 2019);…”

Section: The Commonly Accepted Scheme Of Double Administration Of Pgf2α With a 11-day Intervalmentioning

confidence: 99%

Induction and synchronization of oestrus in sheep and goats

Skliarov¹,

Pérez²,

Petrusha³

et al. 2021

JCEA

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Different methods for oestrus induction and synchronization in domestic small ruminants have been developed.Seasonality and female's status are important factors for choosing the most appropriate treatment. In the case of females during breeding season, prostaglandins can be used since functional corpus luteum must be present in the ovaries, while during non-breeding season females should be treated with progesterone-based treatments, accompanied by equine chorionic gonadotrophin (eCG), releasing hormones and other compounds. Significant spread of oestrus synchronization during and after the breeding season has been achieved by the use of intravaginal sponges impregnated with synthetic analogues of progesterone. However, the effect of hormonal drugs on the female reproductive system may manifest differently depending on the initial functional state of reproductive organs and the hormonal status, and negative consequences can be observed when drugs are wrongly administered. In addition, insufficient knowledge about the patterns of change in the reactivity of the nervous sexual centers and the corresponding reactions of the body to the administration of hormones reduces their effectiveness, which limits the widespread use. In general, the induction and synchronization of oestrus in small ruminants is an currently important direction of scientific research and an urgent problem of sheep and goat breeding, but the proposed methods require further improvement by reducing the costand increasing biosecurity and predictability of the result.

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“…Changes or results in estrous synchronization programs have been modified over the years depending on the duration of insertion of the sponge or the device in the goat, however, the use of hormones to regulate goat reproduction has been maintained over the years [12,13], with changes especially in the higher use of nonsteroidal hormones, such as those derived from prostaglandins, gonadotropin-releasing hormones, and hormones of follicular growth and development such as equine chorionic gonadotropin; being the most frequent use in the European community for health reasons. The use of steroid hormones such as progestogens continue to be used globally [14], but under the premise of using short protocols (5 to 7 days). In the present and in future years the use of short protocols of 5-7 days will be used more and more because it has a series of advantages compared to short protocols; these being the decrease in the presence of vaginitis in animals; in the case of CIDR devices, reuse them up to twice more with an effectiveness of up to 90% of estrous in goats.…”

Section: Will It Be Possible To Improve the Parameters Of Presence Ofmentioning

confidence: 99%

Reproduction in Small Ruminants (Goats)

Sánchez-Dávila¹,

Muñoz²

2021

Animal Reproduction in Veterinary Medicine

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The exploitation of small ruminants (goat and sheep) has always been linked to the development of human civilizations, where they have mainly fed on their derived products such as milk and meat. Currently, the sheep population is around 1 billion head concentrated above 50% in three countries, China, Australia, and New Zealand, contrary to goats with around 720 million heads, distributed mainly in Asia, Africa, and South America. Both species have similar characteristics in some anatomical aspects (a pair of nipples), gestation period (150 days), and presence of seasonal anestrus, differing in terms of magnitude and depth and presence of the male effect. However, they are completely different in feeding habits, nutrient needs, and grazing systems, with differences in terms of the female’s reproductive tract, among other characteristics. Currently, the study of reproduction has intensified over the years in the goats and its counterpart that is the buck. Therefore, in the following topics, the importance of global reproduction of the goat will be discussed, considering that progress has been made today in the application of third generation reproductive techniques and that today they are already consolidated and developed in the bovine species.

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Estrous synchronization in ewes: The use of progestogens and prostaglandins

Cited by 10 publications

References 73 publications

Comparison of Five Protocols of Estrous Synchronization on Reproductive Performance of Hu Sheep

Comparison of Five Protocols of Estrous Synchronization on Reproductive Performance of Hu Sheep

Induction and synchronization of oestrus in sheep and goats

Reproduction in Small Ruminants (Goats)

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