Seasonal variation of the estrous cycle length, corpus luteum area, and size of the pre-ovulatory follicle in Criollo Limonero heifers

2021 ◽  
Vol 53 (6) ◽  
Author(s):  
Merilio Montero-Urdaneta ◽  
Sunny Zambrano-Nava ◽  
Belkys Bracho-Bravo ◽  
Marcelo Gil-Araujo ◽  
Thais Díaz ◽  
...  
1991 ◽  
Vol 71 (1) ◽  
pp. 61-68 ◽  
Author(s):  
C. Taylor ◽  
R. Rajamahendran

Ultrasound imaging and progesterone (P4) profiles were used to characterize follicular and corpus luteum (CL) growth and regression in 10 cycling dairy cows. Thirteen of sixteen cycles were characterized by two waves of follicular growth, the second wave giving rise to the ovulatory follicle. The remaining three cycles had three waves. There was no difference between two- and three-wave cycles with regard to the day of emergence of the first or second dominant follicle (day 2.5 ± 0.9 vs. day 2.4 ± 1.2 and day 12.4 ± 1.6 vs. day 12.0 ± 2.0, respectively) or the onset of regression of the first dominant follicle (day 12.5 ± 1.5 vs. day 12.3 ± 1.5). In two wave cycles, estrous cycle length was shorter (20.8 ± 1.7 d vs. 29.7 ± 4.9 d), the first day of decline in P4 (day 16.2 ± 1.5 vs. day 23.7 ± 5.5) and the onset of CL regression (day 17.1 ± 1.3 vs. day 24.3 ± 5.5) was earlier. It is concluded that two waves of follicular growth in an estrous cycle is the norm in lactating dairy cows. The presence of an additional wave is due to a prolonged luteal phase. Key words: Follicle, corpus luteum, estrous cycle, dairy cow


1979 ◽  
Vol 19 (2A) ◽  
pp. 355-365 ◽  
Author(s):  
I. HATJIMINAOGLOU ◽  
T. ALIFAKIOTIS ◽  
N. ZERVAS

2021 ◽  
Vol 14 (1) ◽  
pp. 027-036
Author(s):  
Olusayo Moritiwon ◽  
Timothy Olugbenga Ogundeko ◽  
James Bitrus ◽  
David Oyebode ◽  
Olufunmilayo Ibiyemi Abobarin

Alcohol related health challenges have lingered over the years. Such associated with locally brewed alcoholic beverages have received little attention. The urgency to explore this becomes imperative. This study aimed at evaluating the effect of regular consumption of local alcoholic beverages on the estrous cycle and histological image of the ovaries and uterus thus fertility of female albino rats. Thirty screened female albino rats weighing 180-220g were divided into five groups and daily administered each with 10ml/kg of pito, burukutu, ogogoro, goskolo and 0.5ml/kg normal saline respectively for 21 days. Effect of the beverages on the estrous cycle as well as histopathological evaluation was carried out on the isolated ovaries and uterus. Results showed significant increase proestrous phase of the estrous cycle with ingestion of pito, burukutu, ogogorogo and goskolo. Also the histology of the ovary was basically without obvious pathological changes with pito, while there was alteration of histological parameters by burukutu, marked with formation of fibrosis, corpus luteum cyst resulting immature ovarian follicle, ogogoro marked with formation of fibrosis, corpus luteum cyst resulting immature ovarian follicle and goskolo marked with formation of multiple follicular cyst resulting in complete collapse of the ovarian section. The effect of traditional alcoholic beverages revealed the classical effects of alcoholic drinks by way of significant alteration in the estrous cycle of albino rats with marked alteration of the histological architecture of ovarian tissues. Pito, burukutu, ogogoro, and goskolo have a reprotoxic effect on the ovaries and uterus thus a deleterious effect on fertility of female albino rats.


Author(s):  
Vinny Dodiyar ◽  
Parkash Singh Brar ◽  
Narinder Singh ◽  
Mrigank Honparkhe

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.


1969 ◽  
Vol 29 (4) ◽  
pp. 616-618 ◽  
Author(s):  
T. H. Brinsfield ◽  
D. K. Higginbotham ◽  
H. W. Hawk

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