Miniature ponies: 1. Follicular, luteal and endometrial dynamics during the oestrous cycle

Gastal, E.L.; Neves, Adriana Pires; Mattos, R.C.; Petrucci, Bianca; Gastal, M.O.; Ginther, O.J.

doi:10.1071/rd07164

Cited by 31 publications

(13 citation statements)

References 23 publications

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“…Additionally, the mares were supplied with 1.0 kg of the concentrated feed (per day per animal) containing digestible energy of 2800 kcal/kg, 13.0 % of crude protein, and other ingredients (Equest Supra Animal Nutrition, São Leopoldo, Rio Grande do Sul, Brazil) as well as water and mineral salt (Suprasal Equino 80 Supra Animal Nutrition) ad libitum. LMs were monitored by ultrasonography to examine the follicles (ovaries), uterus, and cervix starting from the second postpartum day (two examinations in 2 days), until detection of follicles 30 mm in diameter (the sum of the larger and smaller diameter divided by 2) (Gastal et al 2008), when we started to examine the mares daily (Azevedo et al 2013). Finding of a follicle ≥ 35 mm in diameter with simultaneous edema of the endometrium (presence of endometrial folds), uterine tonus (Hayes and Ginther 1986), and the open cervix indicated the right time for intravenous injections of human chorionic gonadotropin (1500 IU HCG; Folligon, MSD, São Paulo, Brazil) to induce ovulation (Winter et al 2007).…”

Section: Horses and Methodsmentioning

confidence: 99%

Reproductive efficiency in lactating mares inseminated early in the puerperium (<10 days post partum) versus non-lactating mares inseminated 180 days post partum

Camargo¹,

Kozicki²,

Ruda³

et al. 2017

PHK

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Summary: To achieve the desired reproduction rate of one foal per year per mare and to optimize the reproductive potential of mares that are embryo donors, foal heat should be utilized as a tool for improvement of fertility. The mare is the only domestic animal showing ovulatory estrus shortly after foaling. The uterine involution and the ovarian activity (post partum follicular dynamic) in the early puerperium go through brief periods of time. Fetal expulsion at physiological delivery occurs within a short time and the placenta is expelled few hours later. Such events in the intra-and peri-partal period may be also related to the type of histological tissue that composes the cervix in these animals. The mare's cervix (muscular type) has a fantastic speed related to uterine involution, unlike the other species in domestic animals (cervix fibro-cartilaginous type) (more resistant requesting more time to involute). Nonetheless, fertility during foal heat is reported to be by some authors better or similar or even lower than fertility during heat outside this period. There are still some controversies on this matter, so we hypothesized that non-lactating mares have a greater potential for pregnancy rate than that lactating mares in foal heat, because the uterine involution is already finalized and ovarian activity is basically normalized in non-lactating mares, opening greater possibilities to became pregnant. In Southern Brazil, the Criollo breed (an original cross between Andalusian and Berber breeds) is a well stablished and widely used breed of horse, as it adapted well to the features of the Brazilian climate under field conditions, and developed two useful abilities (too much for work, and sports). To improve the reproduction mainly in Criollo horses, this study aimed to compare the pregnancy rate (PR) and other reproductive parameters (parturition-artificial insemination interval; parturition-ovulation interval; diameter of preovulatory follicle; artificial insemination-ovulation interval) between lactating mares in early puerperium and non-lactating mares artificially inseminated (AI) ≥ 180 days postpartum. This study took place at a stud farm in Southern Brazil between September and December (breeding season). Thirty-one mares Criollo breed, multiparous with mean age 9.6 years (range 6 -14) and body condition score (BCS) 3.1 (1= thin, 5 = obese) were divided into two groups: lactating mares (LMs) subjected to AI <10 days postpartum (n =16) and non-lactating mares (NLMs) AI ≥180 days postpartum (n =15). The mares were selected based on clinical criteria (absence of clinical endometritis or abnormal uterine discharge and by parturition date). Both groups had the same environment and nutritional conditions. The ovaries were examined by ultrasonography every other day; after detection of a follicle ≥ 30 mm in diameter (= the sum of the larger and smaller diameter divided by 2), the examinations with ultrasonography were conducted daily. After the detection of follicles ≥ 35 mm, uterine edema, and open cervix, ...

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Section: Horses and Methodsmentioning

confidence: 99%

Reproductive efficiency in lactating mares inseminated early in the puerperium (<10 days post partum) versus non-lactating mares inseminated 180 days post partum

Camargo¹,

Kozicki²,

Ruda³

et al. 2017

PHK

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“…All anestrous mares were assigned to GP4, and therefore GNP4 was composed of the remaining animals, which were in transitional phase. The follicles were measured based on the [(smaller diameter) + (larger diameter)] divided by 2 (Gastal et al 2008). Before the device was inserted, the vulva and perineum were cleaned with mild soap and water, and dried with a paper towel.…”

Section: Mare Selectionmentioning

confidence: 99%

Two administrations of an intravaginal progesterone device on the induction of ovarian cyclicity in anestrous mares

Polo¹,

Weiss²,

Bertol³

et al. 2016

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Summary:The study aimed to evaluate the effect of double administration of a progesterone (P4) intravaginal device on induction of ovarian cyclicity in mares. Twelve crossbred mares were assigned to one of two groups. The first group (GP4; n = 6; 100 % in anestrus phase) underwent the following protocol: day (d) 0, 1.9 g of P4 + ultrasound of the uterus and ovaries (US); d 7, US; d10, first P 4 removal + US; d10 -d 24, US daily; d 28, second P4; d 35, US; d 40, second P4 removal + US; d 40 -d 54, US daily; and d 54 -d 76, US every other day. The second group (GNP4; n = 5; 100 % in transition phase) underwent the same protocol as GP4, but without the administration of the P4 device. From d 55 -d 76, 100.0 % of the mares in both groups held uterine tonus and 83.3 % had endometrial edema; after the first and second P4 removal, 66.7 % and 83.3 % of GP4 mares, respectively, reached the transition phase. By d 76, 50.0 % and 80.0 % of the GP4 and GNP4 animals, respectively, had ovulated; the average size of the largest follicle increased from d 0 -d 76 in both groups, but was significant only in GP4. Four to five days after the first and second P4 removals in GP4, follicles showed an average growth of 9.0 mm. At the end of the study, both groups had follicular medium diameters greater than 34 mm (P > 0.05). Ovulations correlated with body condition scores (P < 0.05). In conclusion, two administration of P4 affected ovarian cyclicity in anestrous mares, and synchronized follicular waves and ovulation.

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“…Tiga ekor kuda mengovulasikan satu folikel dan satu ekor kuda mengovulasikan dua folikel dengan rataan diameter folikel dominan sehari sebelum ovulasi adalah 4,81±0,92 cm dan diameter korpus rubrum yang terbentuk adalah 3,82±0,45 cm (Gambar 1). Diameter folikel dominan tersebut tidak berbeda dibanding diameter kuda di daerah subtropis (Gastal et al, 2008). Hal ini membuktikan bahwa perubahan lingkungan subtropis ke daerah tropis tidak memengaruhi fertilitas kuda warmblood sebagaimana yang dikhawatirkan selama ini.…”

Section: Hasil Dan Pembahasanunclassified

Ovsynch Dan Inseminasi Buatan Pada Induk Kuda Warmbloodyang Diinduksi Ovulasi Dengan Human Chorionic Gonadotropin Dosis Jamak

Amrozi¹,

Tumbelaka²,

Ocktaviani³

et al. 2015

J Kedokt Hewan

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ABSTRAKPenelitian ini bertujuan mengamati pola pertumbuhan folikel dan keberhasilan inseminasi buatan dengan semen cair pada induk kuda warmblood yang disinkronisasi estrus dan ovulasi (ovsynch). Induk kuda berjumlah lima ekor berumur 6-18 tahun digunakan dalam penelitian ini. Sinkronisasi estrus dilakukan pada induk kuda yang memiliki korpus luteum berdiameter minimal 3,0 cm dengan injeksi prostaglandin 7,5 mg secara intramuskular. Induksi ovulasi dilakukan dengan memberikan hCG 1500 IU secara intravena 48 jam setelah sinkronisasi estrus dan diulang setiap 24 jam sampai terjadinya ovulasi folikel (dosis jamak) yang diamati dengan ultrasound. Inseminasi buatan dilakukan berulang mengikuti setiap pemberian hCG sampai terjadinya ovulasi dengan dosis inseminasi 1,5x10 9 spermatozoa. Sinkronisasi estrus dan ovulasi dengan menggunakan hCG dosis jamak menghasilkan ovulatori dominan folikel berdiameter 4,81±0,92 cm dan korpus rubrum berdiameter 3,82±0,45 cm serta menghasilkan 60% kebuntingan. Kesimpulan sinkronisasi ovulasi dengan pemberian hCG dosis jamak pada kuda warmblood yang diinseminasi buatan dengan semen cair efektif menghasilkan kebuntingan yang tinggi. ____________________________________________________________________________________________________________________ Kata kunci: inseminasi buatan, kuda warmblood, ovsynch, ultrasound ABSTRACT PENDAHULUANKuda warmblood di Indonesia jumlahnya sangat terbatas. Kuda jenis ini diimpor dari Eropa dan Australia untuk memenuhi kebutuhan olah raga berkuda, terutama jumping dan dressage. Peningkatan jumlah kuda warmblood di Indonesia sangat penting untuk menunjang akses atlet olah raga berkuda terhadap kuda yang lebih berkualitas sehingga dapat meningkatkan prestasi olah raga berkuda. Peningkatan populasi telah diusahakan melalui inseminasi buatan menggunakan semen beku impor yang telah dilakukan pada tahun 1997 di Artayasa Stable. Pada tahun 2005 juga telah dilakukan inseminasi buatan dengan semen cair dan semen beku produksi dalam negeri di Detasemen Kavaleri Berkuda Parongpong pada kuda crossbred dengan tingkat keberhasilan yang masih rendah (Arifiantini, 2008).Tingkat keberhasilan inseminasi buatan pada kuda dipengaruhi berbagai faktor, antara lain jenis semen yang digunakan (Sieme et al., 2004), intensitas pelaksanaan inseminasi (Sieme et al., 2003), dan tempat deposisi semen pada organ reproduksi (Squires et al., 1998;Sieme et al., 2004). Waktu yang tepat ketika menempatkan semen pada uterus juga memengaruhi keberhasilan inseminasi buatan, sehinggga induksi ovulasi dan pengamatan pertumbuhan folikel dengan ultrasound banyak digunakan dalam pelaksanaan inseminasi buatan pada kuda (Samper, 2001) di negara subtropis. Untuk mendukung keberhasilan inseminasi buatan pada kuda warmblood di Indonesia maka perlu penelitian tentang sinkronisasi estrus, lisis korpus luteum, dan pertumbuhan folikel. Penelitian ini bertujuan mengamati pola pertumbuhan folikel dan keberhasilan inseminasi buatan dengan semen cair pada kuda warmblood yang disinkronisasi estrus dan ovulasi denga...

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Miniature ponies: 1. Follicular, luteal and endometrial dynamics during the oestrous cycle

Cited by 31 publications

References 23 publications

Reproductive efficiency in lactating mares inseminated early in the puerperium (<10 days post partum) versus non-lactating mares inseminated 180 days post partum

Reproductive efficiency in lactating mares inseminated early in the puerperium (<10 days post partum) versus non-lactating mares inseminated 180 days post partum

Two administrations of an intravaginal progesterone device on the induction of ovarian cyclicity in anestrous mares

Ovsynch Dan Inseminasi Buatan Pada Induk Kuda Warmbloodyang Diinduksi Ovulasi Dengan Human Chorionic Gonadotropin Dosis Jamak

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