Effect of ram exposure and prostaglandin F2 alpha on the reproductive performance of anestrous ewes

Smith, Michael F.; Swartz, Holly A.; Kiesling, D.O.; Warren, Jennifer E.

doi:10.1016/0093-691x(86)90012-9

Cited by 9 publications

(5 citation statements)

References 16 publications

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“…In a similar study, Smith et al [20] found that 14% of progesterone-treated ewes were in the luteal phase at the first day of application. The difference may be attributed to the breed of sheep and the location.…”

Section: Discussionmentioning

confidence: 86%

“…However, steroids have negative effects on the environment and human and animal health; thus, the administration of prostaglandin F2 alpha (PGF2α) instead of steroids would be beneficial [13,19] . Therefore, studies have been conducted to find effective methods of using PGF2α administration together with the ram effect, particularly in sheep herds in out of breeding season [20] .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The Combined Effect of Prostaglandin Administration and Ram Introduction in Multiparous and Nulliparous Sheep in Anestrous Period on Prolificacy

Rişvanlı¹,

Demiral²,

Abay³

et al. 2014

Kafkas Univ Vet Fak Derg

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Section: Discussionmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

The Combined Effect of Prostaglandin Administration and Ram Introduction in Multiparous and Nulliparous Sheep in Anestrous Period on Prolificacy

Rişvanlı¹,

Demiral²,

Abay³

et al. 2014

Kafkas Univ Vet Fak Derg

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“…Based on observations in sheep that, following exposure to males (and irrespective of whether the females experience a short or normal cycle) a corpus luteum is always present 13 days later, Smith et al. () managed to achieve the synchronization of the next oestrus in this species by administering a leutolytic treatment, PGF 2 α (PGF) on day 16 post‐exposure. Prostaglandin F 2 α and its analogues have been extensively used in sheep because of their strong and reliable luteolytic activity, which in this species is very effective in the early luteal phase.…”

Section: Synchronizing Ovulation Using the Male Effectmentioning

confidence: 99%

Hormone‐free Protocols for the Control of Reproduction and Artificial Insemination in Goats

Coloma

Toledano

Santiago-Moreno

2014

Reprod Domestic Animals

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Contents The dairy goat industry is of great economic importance to certain rural areas of the European Union (EU), especially the Mediterranean region. Its sustainability, however, is severely affected by the seasonality of goat reproduction, which leads to fluctuations in the availability of final products. Classical hormone treatments based on progestagens and eCG are the main tools employed in the effort to achieve fertility outside of the normal breeding season. They are also used to induce and synchronize oestrus and ovulation in artificial insemination programs. The food safety policy of the EU is becoming ever stricter with regard to the use of hormonal treatments for reproductive purposes, pushing livestock‐raising towards ever cleaner and greener production systems. Recent advances in the use of natural methods able to generate endocrine signals that induce the ovulatory process have improved our capacity to foster reproduction in the non‐breeding season. When used in a fashion appropriate for the latitude at which animals live, their breed, and the management system under which they are raised, environmental (photoperiod), nutritional and sociosexual (the male effect) signals offer alternatives to classic hormonal techniques. This affords the fragile and heterogeneous goat production sector with new opportunities. This article describes the most representative advances made in the use of the male effect as a natural method of inducing ovulation during seasonal anoestrus. Its association with other methods for optimizing responses and synchronizing induced ovulation is also discussed; such associations allow it to be used as an alternative to hormonal treatment in artificial insemination programs.

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“…Oldham et al (1985) and Pearce et al (1987) reported that progesterone applications on the day of ram introduction or earlier can eliminate the early regression process and concentrate the estrous periods of ewes into a shorter period. An alternate method of concentrating the estrous periods is the injection of prostaglandin FZru analogues after ram introduction (Smith et al 1986). Lopez-Sebastian and Inskeep (1988) reported that 14 and 16-day intervals from ram exposure to prostaglandin injection give better conception and pregnancy rates compared to an interval of 12 days for Rasa Aragonesa ewes in first service.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ram Introduction in Combination with Progesterone or Cloprostenol on Estrus Induction Rates of Konya Merino Ewes in the Anestrous Season

Aksoy

Tekeli

Özsar

et al. 1994

Reprod Domestic Animals

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Effect of ram exposure and prostaglandin F2 alpha on the reproductive performance of anestrous ewes

Cited by 9 publications

References 16 publications

The Combined Effect of Prostaglandin Administration and Ram Introduction in Multiparous and Nulliparous Sheep in Anestrous Period on Prolificacy

The Combined Effect of Prostaglandin Administration and Ram Introduction in Multiparous and Nulliparous Sheep in Anestrous Period on Prolificacy

Hormone‐free Protocols for the Control of Reproduction and Artificial Insemination in Goats

Effect of Ram Introduction in Combination with Progesterone or Cloprostenol on Estrus Induction Rates of Konya Merino Ewes in the Anestrous Season

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