Follicular dynamics, repeatability and predictability of follicular recruitment in cows undergoing repeated follicular puncture

Boni, Raffaele; Roelofsen, M.W.M.; Pieterse, M.C.; Kogut, J.; Kruip, Th.A.M.

doi:10.1016/s0093-691x(97)84075-7

Cited by 87 publications

(83 citation statements)

References 23 publications

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“…The dominant follicle is functional only during growth or early plateau phases, period in which it can induce atresia of subordinate follicles, and also block follicular recruitment and emerging of a new wave (Fortune, 1994;Ginther et al, 1996). Precocious induction of DF atresia by GnRH, LH or estradiol administration (Thatcher et al, 1993;Bo et al, 1995), or DF ablation (Boni et al, 1997), results in the establishment of a new wave, and are used as methods of follicular growth synchronization (Armstrong, 1993;Bodensteiner et al, 1996). The subordinate follicles maximum diameter observed in this study, and also their growth and atresia rates, were not different among waves and among cows with different number of waves per cycle (P>0.05), and similar to what is reported on the literature Figueiredo et al, 1997).…”

Section: Resultsmentioning

confidence: 99%

Follicular dynamics in zebu cattle

Viana

Ferreira

Sá

et al. 2000

Pesq. agropec. bras.

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-The aim of this study was to investigate the follicular dynamics during estrous cycle in Gir breed (Bos indicus) cows. Follicular growth and atresia during estrous cycle were evaluated using a portable ultrasound device. Luteal activity was evaluated by serum progesterone levels. Cycles with two (6.67%), three (60.00%), four (26.67%) and five (6.67%) follicular waves were observed. There was no difference (P>0.05) in dominant or subordinate follicles growth or atresia rates among follicular waves. The maximum diameter of the ovulatory follicle was higher than the diameter of the other dominant follicles in cycles with four waves, and higher than the diameter of the second dominant follicle in cycles with three waves (P<0.05). There was no difference (P>0.05) in estrous cycle length (21.11±1.76 and 22.25±1.71 days) or progesterone levels during diestrous (4.48±1.45 and 5.08±1.40 ng/mL) between cycles with three or four waves. Follicular dynamics in Gir cattle is characterized by a higher incidence of cycles with three or four waves, associated with a low persistence of the dominant follicle.Index terms: bovines, Gir breed, oestrous cycle, ovaries, ovarian follicles, ultrasonics. DINÂMICA FOLICULAR EM VACAS ZEBUÍNAS RESUMO -Objetivou-se neste trabalho estudar a dinâmica folicular em vacas da raça Gir (Bos indicus).O crescimento e a atresia folicular foram monitorados diariamente ao longo de ciclos estrais completos (n = 15), utilizando-se um aparelho portátil de ultra-som. A atividade luteal em cada ciclo foi avaliada pela determinação do nível de progesterona plasmática. Foram observados ciclos com duas (6,67%), três (60,00%), quatro (26,67%) e cinco (6,67%) ondas de crescimento folicular. Não houve diferença significativa (P>0,05) nas taxas de crescimento e atresia de folículos dominantes ou subordinados, entre ondas. O diâmetro máximo do folículo ovulatório foi maior (P<0,05) que o dos demais folículos dominantes nos ciclos com quatro ondas e do que o diâmetro do folículo dominante da segunda onda nos ciclos com três ondas. Não houve diferença significativa (P>0,05) no comprimento do ciclo (21,11±1,76 e 22,25±1,71 dias) ou na concentração de progesterona durante o diestro (4,48±1,45 e 5,08±1,40 ng/mL), entre ciclos com três ou quatro ondas de crescimento. Esses resultados demonstraram que a dinâmica folicular na raça Gir é caracterizada pela predominância de ciclos com três ou quatro ondas de crescimento folicular, associados à baixa persistência dos folículos dominantes das ondas intermediárias.Termos para indexação: bovinos, raça Gir, ciclo estral, ovários, folículos ovarianos, ultra-som.

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Section: Resultsmentioning

confidence: 99%

Follicular dynamics in zebu cattle

Viana

Ferreira

Sá

et al. 2000

Pesq. agropec. bras.

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“…Thus, these results suggested that the technical level used in this study was reliable and that the number of group 1 oocytes recovered transvaginally is dependent on the number of aspirated follicles, as shown in a previous study [8]. From the data of the relationship between the number of embryos recovered following multiple-ovulation treatment and the number of follicles aspirated transvaginally, it was suggested that the number of follicles emerged in each estrous cycle is almost the same for at least one year in the same donor cow, and is regulated for each individual animal as suggested by Boni et al [1]. Therefore, the individual differences in the number of oocytes recovered transvaginally [5] may be caused by differences in the number of emerged follicles.…”

mentioning

confidence: 52%

Relationship between the Responsiveness to Multiple-ovulation Treatment and the Number of Bovine Oocytes Collected by Transvaginal Follicle Aspiration.

Hashimoto

Takakura

Yoshinari

et al. 2000

The Journal of Veterinary Medical Science

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ABSTRACT. To characterize factors affecting the number of bovine oocytes recovered transvaginally, a regression analysis was performed between the responsiveness to multiple-ovulation treatment and the number of oocytes recovered transvaginally. The number of embryos recovered following multiple-ovulation treatment and the number of oocytes recovered transvaginally increased when the number of follicles to be aspirated transvaginally increased (P<0.05, P<0.01). The number of cumulus-oocyte complexes recovered transvaginally also increased when the number of oocytes to be aspirated transvaginally increased (P<0.001). However, the number of viable embryos that recovered following multiple-ovulation treatment had no relation to the number of cumulus-oocyte complexes recovered transvaginally. These results suggested that more oocytes can be recovered from donors that have a high responsiveness to multipleovulation treatment.-KEY WORDS: bovine oocytes, cattle, transvaginal aspiration.

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“…Outro fator que pode dificultar o estabelecimento mais preciso da relação entre intensidade de punção e a ocorrên-cia de lesões é o tipo de agulha utilizado. São relatadas a utilização de agulhas com calibres 17 (Gibbons et al 1994, Fry et al 1998, Schernthaner et al 1999, 18 (Stubbings & Walton 1995, Boni et al 1997), 19 (Machatková et al 2000 e 20 (Bols et al 1996b) Gauge, descartáveis (Machatková et al 2000) ou não (Vos et al 1994, Stubbings & Walton 1995, Boni et al 1997. Agulhas de menor calibre apresentam menor área de corte, sendo potencialmente menos danosas ao tecido, enquanto agulhas descartáveis, por terem o bisel mais afiado, exercem menor pressão sobre as estruturas puncionadas (Bols et al 1997).…”

Section: Discussionunclassified

“…ou semi-cirúrgica dos ovários. A ultra-sonografia possibilita a obtenção de oócitos pela utilização de um sistema de biópsia por agulha, considerado pouco traumático (Pieterse et al 1991a), e que pode ser utilizado repetidas vezes em um mesmo animal (Kruip et al 1994, Boni et al 1997, com eficiência semelhante (Becker et al 1996) ou eventualmente até maior (Santl et al 1998) que a da laparoscopia.…”

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“…Nestes casos, é desejável que não haja qualquer comprometimento posterior da fertilidade. Contudo, a possibilidade do uso repetido da técnica, e em intervalos tão curtos como dois a três dias (Boni et al 1997), requer uma melhor avaliação dos riscos para os animais utilizados como doadores de oócitos. Objetivou-se com este estudo caracterizar as seqüelas subseqüentes às punções foliculares, em doadoras de oócitos coletadas por diferentes períodos de tempo.…”

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