Ovarian follicular dynamics and hormones throughout the estrous cycle in Thai native (Bos indicus) heifers

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.

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Follicular dynamics and plasma FSH and progesterone concentrations during follicular deviation in the first post-ovulatory wave in Nelore (Bos indicus) heifers

Animal Reproduction Science ◽

10.1016/j.anireprosci.2006.03.008 ◽

2007 ◽

Vol 98 (3-4) ◽

pp. 189-196 ◽

Cited By ~ 20

Author(s):

Caliê Castilho ◽

Joaquim M. Garcia ◽

Andrea Renesto ◽

Guilherme P. Nogueira ◽

Leonardo F.C. Brito

Keyword(s):

Bos Indicus ◽

Follicular Dynamics

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Ovarian Follicular Dynamics during the Estrous Cycle in Jennies in Upper Egypt

Veterinary Medicine International ◽

10.4061/2011/860518 ◽

2011 ◽

Vol 2011 ◽

pp. 1-6 ◽

Cited By ~ 6

Author(s):

R. I. Derar ◽

H. A. Hussein

Keyword(s):

Growth Rate ◽

Estrous Cycle ◽

Slow Rate ◽

Ovarian Follicles ◽

Maximum Diameter ◽

Dominant Follicle ◽

Upper Egypt ◽

Follicular Wave ◽

Preovulatory Follicles ◽

Follicular Dynamics

The objective of the current study was to describe follicular dynamics in Egyptian Jennies throughout the estrous cycle. In this experiment, 8 estrus cycles in 8 cyclic Jennies were studied from February to June using ultrasonography. The result revealed that one follicular wave per cycle was recorded throughout the studied period. Dominant follicle (DF) was firstly detected at day in Jennies. The growth rate of DF was mm/day. Left ovulations were nonsignificantly () more than right ovulations (55.6% versus 44.6%). The CL was firstly detected at D , developed in a rate of mm/day, reached a maximum diameter of mm at D , and started to regress on D with a mean regression rate of mm d-1. Results of the present study indicated that Jennies had one follicular wave per cycle. The Day of the cycle has a significant effect on the number of different classes of the ovarian follicles, but not large ones. Ultrasonographic characteristics of the preovulatory follicles could be useful to predict ovulation. CL developed and regressed in a slow rate.

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Fixed-time artificial insemination using injectable progesterone: ovarian follicular dynamics and pregnancy rates of Nelore cows (Bos indicus) with and without a corpus luteum

Semina Ciências Agrárias ◽

10.5433/1679-0359.2013v34n6supl2p3867 ◽

2013 ◽

Vol 34 (6Supl2) ◽

pp. 3867 ◽

Cited By ~ 1

Author(s):

Fábio Morotti ◽

Jefferson Tadeu Campos ◽

Marcelo Marcondes Seneda

Keyword(s):

Corpus Luteum ◽

Artificial Insemination ◽

Bos Indicus ◽

Fixed Time ◽

Pregnancy Rates ◽

Follicular Dynamics

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Day of estrous cycle affects follicular dynamics after induced luteolysis in ewes

Journal of Animal Science ◽

10.2527/1995.7372094x ◽

1995 ◽

Vol 73 (7) ◽

pp. 2094-2101 ◽

Cited By ~ 29

Author(s):

J.A.S. Houghton ◽

N. Liberati ◽

F. N. Schrick ◽

E. C. Townsend ◽

R. A. Dailey ◽

...

Keyword(s):

Estrous Cycle ◽

Follicular Dynamics

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Studies on Ovarian Follicular Dynamics and Steroid Profiles in Sahiwal Cattle

Indian Journal of Animal Research ◽

10.18805/ijar.b-4113 ◽

2021 ◽

Author(s):

Vinny Dodiyar ◽

Parkash Singh Brar ◽

Narinder Singh ◽

Mrigank Honparkhe

Keyword(s):

Corpus Luteum ◽

Estrous Cycle ◽

Maximum Diameter ◽

Endocrine Regulation ◽

Dominant Follicle ◽

Estrous Cycles ◽

Significant Difference ◽

Sahiwal Cattle ◽

Sahiwal Cows ◽

Follicular Dynamics

Background: Understanding of ovarian follicular dynamics and endocrine regulation is essential to design and use interventions to optimize reproductive efficiency. Bos indicus and Bos taurus cows have some differences in their follicular dynamics and ovarian steroidal hormones. The present study was planned to understand follicular dynamics vis-a-vis ovarian steroids profiles in Sahiwal cattle. Methods: The study was conducted in normal cyclic, pluriparous, non-lactating Sahiwal cows (n=7). Trans-rectal ultrasonography was performed to record the location, size, number of follicles and size of corpus luteum (CL) from the beginning, till the end of experiment. The dataset was used to characterize the follicular wave emergence, growth, regression, time of selection and ovulation of the dominant follicle in each cow. Result: Three Sahiwal cows showed two wave and four cows showed three wave estrous cycles with mean interovulatory length of 20.33±0.33 and 22.50±0.28 days, respectively. No significant difference was recorded in the maximum diameter of corpus luteum, P4 and E2 plasma levels between 2-wave and 3-wave estrous cycles. The peak progesterone values of 6.00±0.91 and 6.2±1.2 ng/ml and peak estradiol values of 15.83±0.60 and 14.31±0.44 ng/ml were recorded in 2-wave and 3-wave estrous cycle, respectively. The results showed that Sahiwal cows had 2-wave and 3-wave estrous cycle and the 3-wave estrous cycle had comparatively longer inter-ovulatory period and smaller maximum diameter of second wave dominant follicle than 2-wave estrous cycle.

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117 Subclinical Mastitis Reduces Ovulation and Oocyte Quality in Milk-Producing Cows

Reproduction Fertility and Development ◽

10.1071/rdv30n1ab117 ◽

2018 ◽

Vol 30 (1) ◽

pp. 198

Author(s):

G. Santos ◽

M. P. Bottino ◽

M. B. D. Ferreira ◽

J. C. Silveira ◽

A. C. F. C. M. Avila ◽

...

Keyword(s):

Follicular Fluid ◽

Target Genes ◽

Bos Taurus ◽

Bos Indicus ◽

Cumulus Cell ◽

Cumulus Cells ◽

Subclinical Mastitis ◽

Oocyte Quality ◽

Ovulation Rate ◽

Follicular Dynamics

The aim was to evaluate the effect of subclinical mastitis by somatic cell count (SCC) on follicular dynamics, ovulation, oocyte and cumulus cell quality, exosome size and concentration in milk-producing cows. Crossbred cows (Bos taurus × Bos indicus; that is, Holstein × Gyr) were randomly allocated to control (SCC <200,000 cells mL−1] and mastitis (SCC >400,000 cells mL−1) groups. In experiment 1 (follicular dynamics), cows (n = 57) were submitted to ultrasonographic evaluations every 24 h, after removal of an intravaginal progesterone device (Day 8) up to Day 10. From Day 10, ultrasound evaluations were performed every 12 h, until ovulation or until 96 h after progesterone device withdrawal, in order to follow final dominant follicle growth and ovulation. In experiment 2 (oocyte, cumulus cells, and follicular fluid evaluation), cows (n = 23) were submitted to follicular aspirations, preceded by synchronization of the emergence of the follicular wave. The levels of target genes in cumulus cells (BCL2, BAX, PI3K, PTEN, FOXO3) were evaluated by RT-qPCR. In the follicular fluid, the exosomes were isolated for evaluation of particle size. Data were analysed by the Glimmix procedure of SAS (SAS Institute Inc., Cary, NC, USA). Ovulation rate (P = 0.09) was higher in control cows [control 77.42% (24/31) and mastitis 57.69% (15/26)]. Viable oocyte rate (P = 0.01) was also higher in control cows [control 59.1% (130/220) and mastitis 41.9% (125/298)]. The dynamics of follicular growth did not differ between groups. The number of degenerate oocytes (P = 0.001) was higher in cows of the mastitis group. In the evaluation of cumulus cell gene expression, there was a higher abundance of BAX transcripts (P = 0.003) in cells of mastitis cows. Additionally, the mean and mode of exosome diameter in mastitis cows were smaller (P = 0.03 and P = 0.02, respectively). In conclusion, ovulation rate, oocyte quality, and follicular fluid exosome diameter were lower in cows with subclinical mastitis, demonstrating a link between mammary gland sanitary status and reproduction.

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