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- 검색키워드
- 주제어 : Oestrous Cycle (검색결과 7 건)
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Warriach, H.M.,Ahmad, N. Asian Australasian Association of Animal Productio 2009 Animal Bioscience Vol.22 No.8
The objective of this study was to compare the follicular population during spontaneous and $PGF_2{\alpha}$ induced oestrous cycles in Nili-Ravi buffaloes. In Exp.1, (n = 13 oestrous cycles) follicular population was monitored using ultrasonography on alternate days. Buffaloes were monitored for ovarian follicles from day 0 (first oestrus) until next oestrus. These animals were observed for oestrus twice daily using a teaser bull. Of 12 oestrous cycles, 9 (75%) had two waves of follicular activity and only 3 (25%) had three waves during the oestrous cycle. The mean number of small, medium and large follicles among various days of the oestrous cycle between two and three waves of follicular development were not significantly different (p>0.05). In Exp. 2, follicular population 3 days before oestrus was compared in buffaloes undergoing spontaneous (n = 12 oestrous cycles) and $PGF_2{\alpha}$ induced (n = 6) luteolysis. The mean number of small and large follicles increased (p<0.05) and the number of medium follicles decreased (p<0.05) during the 3 days before oestrus in buffaloes undergoing induced luteolysis as compared to those with spontaneous luteolysis. These results showed that the mean number of small, medium and large follicles among various days of the oestrous cycle were similar between the two and three waves of follicular development, and three days before oestrous the number of small, medium and large follicles altered due to induced luteolysis on day 9, compared to those with spontaneous luteolysis.
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Jun-Mo Kim,Jong-Eun Park,Inkyu Yoo,Jisoo Han,Namshin Kim,Won-Jun Lim,Eun-Seok Cho,Bonghwan Choi,Sunho Choi,Tae-Hun Kim,Marinus F. W. te Pas,Hakhyun Ka,Kyung-Tai Lee 한국동물생명공학회(구 한국동물번식학회) 2018 발생공학 국제심포지엄 및 학술대회 Vol.2018 No.06
Female fertility is a highly regulated process involving the synchronized activities of multiple tissues. The underlying genomic regulation of the tissue synchronization is poorly understood. To understand this better we investigated the transcriptomes of the porcine ovary, endometrium, and oviduct at days 0, 3, 6, 9, 12, 15, or 18 of the oestrous cycle. We analysed the transcriptome profiles of the individual tissues and focus on the bridging genes shared by two or more tissues. The three tissue-networks were connected forming a triangular shape. We identified 65 bridging genes with a high level of connectivity to all other genes in the network. The expression levels showed negative correlations between the ovary and the other two tissues, and low correlations between endometrium and oviduct. The main functional annotations involved biosynthesis of steroid hormones, cell-to-cell adhesion, and cell apoptosis, suggesting that regulation of steroid hormone synthesis and tissue viability are major regulatory mechanisms.
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Han, S.-K.,Lee, K.,Bhattarai, J. P.,Herbison, A. E. Blackwell Publishing Ltd 2010 Journal of neuroendocrinology Vol.22 No.3
<P>There is substantial evidence for a role of the neuropeptide gonadotrophin-releasing hormone (GnRH) in the regulation of GnRH neurone secretion but how this is achieved is not understood. We examined here the effects of GnRH on the electrical excitability and intracellular calcium concentration ([Ca<SUP>2+</SUP>]<SUB>i</SUB>) of GnRH neurones in intact adult male and female mice. Perforated-patch electrophysiological recordings from GnRH-green fluorescent protein-tagged GnRH neurones revealed that 3 n<SMALL>M</SMALL>–3 &mgr;<SMALL>M</SMALL> GnRH evoked gradual approximately 3 mV depolarisations in membrane potential from up to 50% of GnRH neurones in male and female mice. The depolarising effect of GnRH was observed on approximately 50% of GnRH neurones throughout the oestrous cycle. However, at pro-oestrus alone, GnRH was also found to transiently hyperpolarise approximately 30% of GnRH neurones. Both hyperpolarising and depolarising responses were maintained in the presence of tetrodotoxin. Calcium imaging studies undertaken in transgenic GnRH-pericam mice showed that GnRH suppressed [Ca<SUP>2+</SUP>]<SUB>i</SUB> in approximately 50% of GnRH neurones in dioestrous and oestrous mice. At pro-oestrus, 25% of GnRH neurones exhibited a suppressive [Ca<SUP>2+</SUP>]<SUB>i</SUB> response to GnRH, whereas 17% were stimulated. These results demonstrate that n<SMALL>M</SMALL> to &mgr;<SMALL>M</SMALL> concentrations of GnRH exert depolarising actions on approximately 50% of GnRH neurones in males and females throughout the oestrous cycle. This is associated with a reduction in [Ca<SUP>2+</SUP>]<SUB>i</SUB>. At pro-oestrus, however, a further population of GnRH neurones exhibit a hyperpolarising response to GnRH. Taken together, these studies indicate that GnRH acts predominantly as a neuromodulator at the level of the GnRH cell bodies to exert a predominant excitatory influence upon GnRH neurones in intact adult male and female mice.</P>
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Endocrine Profiles of Oestrous Cycle in Buffalo: A Meta-analysis
Mondal, S.,Suresh, K.P.,Nandi, S. Asian Australasian Association of Animal Productio 2010 Animal Bioscience Vol.23 No.2
A meta-analysis was conducted to summarize the results of studies which have described the profiles of hormones during the oestrous cycle in buffalo using a fixed effect model and a random effect model. Plasma progesterone concentrations were lowest (0.30${\pm}$0.06 ng/ml) during the peri-oestrous phase and increased (p = 0.067) through the early luteal phase to a maximum concentration (1.94${\pm}$0.03 ng/ml) during the mid-luteal phase. Circulating plasma inhibin and estradiol concentrations were lowest (0.31${\pm}$0.01 and 11.04${\pm}$0.13 ng/ml) during the mid-luteal phase, increased through the late luteal phase to maximum concentrations (0.44${\pm}$0.02 and 22.48${\pm}$0.32 ng/ml) during the peri-oestrous phase. Plasma FSH concentrations were lowest during the early luteal phase and increased through the mid-luteal phase to a maximum concentration during the peri-oestrous phase. Peripheral prolactin concentrations were lowest during the late luteal phase and increased to a maximum concentration during the peri-oestrous phase which then declined (p = 0.716) during the early luteal phase. Peripheral plasma cortisol concentrations decreased from 2.68${\pm}$0.14 ng/ml during the early luteal phase to 1.43${\pm}$0.27 ng/ml during the mid-luteal phase (p<0.001) which then increased to 2.06${\pm}$0.17 ng/ml during the late luteal phase. Plasma $T_{5}$ concentrations decreased from the late luteal phase to the peri-oestrous phase (p<0.001) which then increased during the early luteal phase. $T_{4}$ concentrations increased from the late luteal phase to the peri-oestrous phase which then decreased during the early luteal phase.
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민관식,장규태,오석두,성환후,이병오,윤창현 한국동물번식학회 1992 Reproductive & developmental biology Vol.16 No.2
The study was conducted to find out the changes of progesterone and 20$\alpha$-dihydroprogesterone (20$\alpha$-OHP) levels during the oestrous cycle in Korean native goats. 4 cyclic goats were offered for this experiment. Blood samples were taken from jugular vein on day 0, 1, 3, 5, 7, 9, 11, 13, 15, 17 and 19 during the oestrous cycle, then the next oestrous day. The serum levels of progesterone and 20$\alpha$-OHP were measured by radioimmunoassay. The progesterone concentration in seurm of the cyclic goats was 0.29$\pm$0.06ng/ml on the first day of oestrous (day 0), increased to 5.29$\pm$0.73ng/ml on day 9, reached to a peak level of 5.73$\pm$0.61ng/ml on day 13, and thereafter decreased to 0.35$\pm$0.30ng/ml on day 1. The serum level of 20$\alpha$-OHP during the oestrous cycle was 0.42$\pm$0.33ng/ml on day 0 and then decreased to 0.28$\pm$0.01ng/ml on day 5. This basal level was maintained until day 13, increased gradually, and reached a peak level of 0.62$\pm$0.05ng/ml on day 19. From the above results, it was suggested that the enzyme 20$\alpha$-hydroxysteroid dehydrogenase(20$\alpha$-HSD) catalyzing the conversion of progesterone to a biologically inactive steroid, 20$\alpha$-OHP, should be active in the luteal cells during the oestrous cycle in Korean native goats.
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Manik, R.S.,Singla, S.K.,Palta, P.,Madan, M.L. Asian Australasian Association of Animal Productio 1998 Animal Bioscience Vol.11 No.5
Application of trans rectal ultrasonography to buffaloes (n=6) to follow the growth of large antral follicles individually, on each day of one interovulatory interval revealed that follicular turnover during oestrous cycle occured in waves. There was a predominance of a two-wave pattern (5/6 animals) compared to that of a three-wave pattern (1/6 animals). For two-wave pattern, the first wave emerged at Day $0.20{\pm}0.19$ (Day 0 = day of ovulation) and was marked by development of a dominant anovulatory follicle which grew in size from $5.40{\pm}0.24mm$ at the day of detection to a maximum diameter of $12.40{\pm}0.81mm$ on Day $8.60{\pm}1.57$, with a growth rate of $0.88{\pm}0.17mm/day$ and then regressed, with a mean persistence of $19.40{\pm}1.54$ days. The second wave emerged at Day $9.20{\pm}1.06$ and was marked by development of a dominant ovulatory follicle which grew in size from $4.20{\pm}0.37mm$ at the day of detection to a maximum diameter of $13.80{\pm}0.37mm$ on Day $21.00{\pm}1.38$, with a growth rate of $0.66{\pm}0.12mm/day$ and then ovulated on Day $21.60{\pm}1.25$, with a mean persistence of $11.80{\pm}1.39$ days. The maximum diameters attained and the growth rates of dominant anovulatory and dominant ovulatory follicles, and the mean number of follicles ${\geq}3mm$ diameter detected at the time of emergence of first and second waves ($11.80{\pm}1.74$ and $9.00{\pm}2.81$, respectively) were not significantly different. In the animal which showed a three-wave pattern, the first, second and third waves emerged on Days 1, 10 and 19, respectively. All animals, except one had at least one subordinate follicle in the first or second or both waves. The subordinate follicles increased in diameter over a few days and then regressed. The results indicate that in buffaloes, the follicular turnover during oestrous cycle occurs predominantly in a two-wave pattern.
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