Sincronização de estro em cabras da raça Saanen com esponja intravaginal e CIDR-G®

Maffili, Vitor Valério; Torres, C. A. A.; Fonseca, J. F. da; Moraes, É. A.; Pontes, R. A. M.

doi:10.1590/s0102-09352005000500004

Cited by 7 publications

(4 citation statements)

References 22 publications

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“…At ovulation, the mean diameter of the dominant follicle was 7.4 ± 0.1 mm, similar to the size previously reported on Toggenburg goats (7.7 ± 1.3 mm, Maffili et al, 2006), as well as in others breeds such as Serrana (7.1 ± 0.1 mm; Simões et al, 2006), Shiba (7.8 ± 0.2 mm; Medan et al, 2005) and Saanen (6.9 ± 1.8 mm; Maffili et al, 2005). Ultrasography is considered an efficient tool to identify ovarian structures.…”

Section: Resultssupporting

confidence: 88%

Luteal dynamics in goats: morphological and endocrine features

et al. 2010

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-The aim of this study was to establish the morphologic and endocrine characteristics of luteal dynamics in goats. It was used Toggenburg female goats that showed natural estrus in a 48-hour interval. After estrus, ultrasonographic evaluations of the ovaries were daily performed during 21 days using a portable device (5MHz probe). Blood sample was collected for plasma progresterone (P 4 ) determination. Corpora lutea were detected for the first time on day 5 and progressively increased in size until D9 (1.26 ± 0.08 cm 2 ), with no variation on subsequent days. In females with one ovulation, the first visualization of the corpora lutea was earlier than in those with multiple ovulation (4.54 ± 0.18 vs 5.74 ± 0.25 days). At the moment of the first visualization, luteal area was smaller in animals with single ovulation. Plasma P 4 concentration progressively increased until day 9 and it did not show significant increase until luteolysis, characterized by a sharp decrease in P 4 concentration, reaching values below 1 ng/mL in 24 hours. The luteal area slowly and gradually decreased in size. It was observed a significant positive correlation between P 4 concentration and area during luteogenesis and luteolysis (r = 0.63 and r = 0.50, respectively).When corpus luteum reached its maximum size (D9), female with more than one corpora lutea, with a greater luteal tissue area, did not show P 4 concentration higher than those with one ovulation (5.92 ± 0.59 vs 7.04 ± 0.79 ng/mL). These results show that luteal dynamics in Toggenbur goats follow a similar pattern to those observed in other goat breeds and luteal tissue growth was positively correlated with corpora lutea functionality.Key Words: corpus luteum, goats, progesterone, ultrasonography Dinâmica luteal em caprinos: características morfológicas e endócrinas RESUMO -Objetivou-se neste estudo estabelecer as características morfológicas e endócrinas da dinâmica luteal em cabras. Foram utilizadas fêmeas da raça Toggenburg que manifestaram estro natural em um intervalo de 48 horas. Após o estro, foram realizadas avaliações ultrassonográficas diárias dos ovários durante 21 dias, utilizando-se um aparelho portátil (5 MHz).Amostras de sangue foram coletadas para dosagem de progesterona (P 4 ) no plasma. Os corpos lúteos foram detectados pela primeira vez no D5 e aumentaram progressivamente de tamanho até o D9 (1,26 ± 0,08 cm 2 ), não havendo variação nos dias subsequentes. Nas fêmeas com uma ovulação, a primeira visualização do corpo lúteo foi mais precoce que naquelas com ovulação múltipla (4,54 ± 0,18 vs 5,74 ± 0,25 dias). No momento da primeira visualização, a área luteal foi menor nos animais com uma ovulação. A concentração plasmática de P 4 aumentou progressivamente até o D9 e não apresentou aumento significativo até o momento da luteólise, caracterizada por uma acentuada queda da concentração de P 4 , atingindo valores inferiores a 1 ng/mL em um intervalo de 24 horas. A área luteal diminuiu de forma lenta e gradual. Foi observada uma correlação positiva signif...

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Section: Resultssupporting

confidence: 88%

Luteal dynamics in goats: morphological and endocrine features

et al. 2010

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“…Lowest P 4 level was observed on day of estrus showing minimum luteal activity. Other researchers revealed that animal showing P 4 level more than 1ng/ ml not in estrus after sponge removal (38,39). Based upon present study it was suggested intravaginal MAP sponges and buck effect did not influence serum P 4 profiles and concentrations.…”

Section: Discussionsupporting

confidence: 51%

Does buck stimulation affect the reproductive performance of goats synchronized with Medroxyprogesterone Acetate (MAP) sponges?

Batool

Shahzad

Hussain

et al. 2022

Rev Colombiana Cienc Anim. RECIA

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This investigation was executed to determine effect of buck exposure on estrus response, onset of standing estrus, ovulation rate, conception rate and pregnancy rate in goats synchronized with medroxyprogesterone acetate (MAP) sponges. Sponges were placed inside the vagina for fifteen days in buck exposed and isolated groups. Post sponge withdrawal, estrus activities were continuously observed. The interval between sponge withdrawal and the onset of standing estrus were 32.3±10 h (18-51 h) and 45.2±10.9 h (27-51h) in buck isolated and exposed group respectively (p<0.05). Ovulation and conception rates were confirmed by serum progesterone level using radioimmunoassay. Ovulation rates were 100% in both groups and conception rates were 93% and 100% in buck exposed and in isolated group respectively (p>0.05). Pregnancies were confirmed by ultrasound on day 35 post mating which were 93%, was and 69% in buck exposed and isolated group respectively (p>0.05). Based upon the evidence, it was inference that post sponge removal sudden buck exposure cause markedly earlier estrus onset while the continuous buck exposure was unable to show significantly impact on conception and pregnancy rates compare to isolated group.

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“…Our group conducted a similar study with Toggenburg goats and reported 100% of estrus response regardless of treatment duration (Nascimento, 2009). Evidently, even a shorter treatment of 5 d was also efficient (83.3%) for estrus induction in Sannen does (Maffili et al, 2005). Using the long-term treatment (12 d) but with a different sponge (FGA) authors observed 100.0% of Boer females in estrus (Holtz et al, 2008).…”

Section: Discussionmentioning

confidence: 97%

Short, medium or long-term hormonal treatments for induction of synchronized estrus and ovulation in Saanen goats during the nonbreeding season

et al. 2013

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-The objective of this study was to compare the effect of hormonal treatment duration through the use of intravaginal sponges impregnated with 60 mg MAP for 6 (G6; n = 10), 9 (G9; n = 10) or 12 (G12; n = 10) days. All nulliparous (n = 15) and lactating (n = 15) Saanen goats received 37.5 µg d-cloprostenol and 200 IU eCG 24 hours before sponge removal during the nonbreeding season. After sponge removal, estrus was monitored twice a day (06h00 and 18h00) by the use of fertile bucks. Transrectal ovarian ultrasonography was performed after device removal until ovulation detection. All goats were bred by artificial insemination (AI) or natural breeding (NB). All females received 250 IU hCG 5 d after AI or NB. No difference was observed among groups G6, G9 and G12 for: estrous response (90.0, 100.0 and 100.0%, respectively); interval from sponge removal to estrus (26.7±5.6, 25.2±2.8 and 25.2±3.3 hours), duration of estrus (28.5±7.1; 21.6±3.0 and 25.2±6.1 hours); ovulation rate (80.0, 100.0 and 70.0%); number of ovulations (1.9±0.2, 1.5±0.2 and 1.4±0.2); and pregnancy rate (60.0, 80.0 and 50.0%). Interval from sponge removal to ovulation was shorter in animals from G6 (44.6±2.2 hours) than for animals from G9 (52.8±2.7 hours) and G12 (60.0±4.5 hours). All treatments were effective in the induction of synchronized estrus in Saanen goats during the nonbreeding season, but ovulation occurred earlier when goats received sponges for 6 days.

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Sincronização de estro em cabras da raça Saanen com esponja intravaginal e CIDR-G®

Cited by 7 publications

References 22 publications

Luteal dynamics in goats: morphological and endocrine features

Luteal dynamics in goats: morphological and endocrine features

Does buck stimulation affect the reproductive performance of goats synchronized with Medroxyprogesterone Acetate (MAP) sponges?

Short, medium or long-term hormonal treatments for induction of synchronized estrus and ovulation in Saanen goats during the nonbreeding season

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