Relationships between follicle and corpus luteum diameter, blood flow, and progesterone production in beef cows and heifers: preliminary results

Tarso, S. G. S. de; Apgar, G. A.; Gastal, M.O.

doi:10.21451/1984-3143-ar797

Cited by 24 publications

(23 citation statements)

References 69 publications

(76 reference statements)

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“…Thus, although daily ovary scanning was not performed, there is a possibility that hCG acted on dominant follicles during the first follicular wave (Day 6 after ovulation) evoking accessory ovulation. No differences in CL diameter, blood flow, and P4 concentration were reported between pregnant and nonpregnant cows until Day 6 following ovulation in a previous study (Tarso et al, 2016). In the present study, similar conditions were noted in Santa Inês sheep.…”

Section: Discussionsupporting

confidence: 84%

Effects of hCG administration on accessory corpus luteum formation and progesterone production in estrous-induced nulliparous Santa Inês ewes

et al. 2018

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The effect of hCG administration on accessory corpus luteum (ACL) formation, CL area, and plasma progesterone (P4) concentration (ng/mL) seven days after breeding was studied in nulliparous Santa Inês sheep. Intravaginal 60 mg MAP sponges were inserted into ewes for six days and 300 IU eCG i.m. and 30 µg d-cloprostenol latero-vulvar were administered 24 h before sponge removal. Ewes were naturally bred and, seven days after first mating (Day 0; D0), were treated with either 250 IU hCG (hCG group; n = 7) or 1 mL saline solution (control group; n = 7). Blood was collected to determine plasma P4 concentrations and sonograms were performed on Days 7, 10, 13, 16, 19, and 22. Number of CL on D7 was similar (P > 0.05) between hCG (1.3 ± 0.5) and control (1.3 ± 0.5) groups; however, on D13, it was greater (P < 0.05) in the hCG group (2.3 ± 0.5) than in the control group (1.3 ± 0.5). A greater (P < 0.05) luteal tissue area was detected in hCG-treated ewes (n = 4) on Days 16 to 22 than in the animals in the control group (n = 7). Plasma P4 concentration on D13 to D22 was higher (P < 0.05) in hCG-treated animals than in control ewes. Administration of hCG seven days after estrus onset efficiently induced accessory CL formation in ewes, increasing luteal tissue area and plasma P4 concentration.

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Section: Discussionsupporting

confidence: 84%

Effects of hCG administration on accessory corpus luteum formation and progesterone production in estrous-induced nulliparous Santa Inês ewes

et al. 2018

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“…Progesterone concentration depends on the size of the ovulatory follicle and luteal phase. Reducing the size of the ovulatory follicle causes a reduction in the size of the CL and the circulating progesterone concentration in lactating dairy cows [11], [13]. This result is consistent with an early reported that claims that the use of Ovsynch protocol before the initiation of a breeding ovsynch with the time AI can induce ovulation in anovular cows and thus increase the percentage of cows with medium circulating Progesterone [38].…”

Section: The Progesterone Concentration Of Local Pesisir Cattle Insupporting

confidence: 90%

“…The cows involved in this study responded well to the administration of hormone PGF2α. This result shows [13] that the first GnRH, when administered at random stage of the estrus cycle, would induce ovulation in cows with the functional dominant follicle. A new follicular wave would be initiated with the dominant follicle selected during the next 7 days.…”

Section: A Diameter Of the Follicle Of Local Pesisir Cowsmentioning

confidence: 69%

“…This result also shows that the diameter pre-ovulation follicle does not affect the ovular rate in local cows and that the size of the follicle in GnRH1 does not affect the follicle size and ovular response in GnRH2. This means that all sizes of follicle can be induced to ovulate but with low results.The injection of GnRH1 does not have any effect on GnRH2 and ovulation [9], [13].…”

Section: A Diameter Of the Follicle Of Local Pesisir Cowsmentioning

confidence: 91%

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Fertility In Local Pesisir Cattle Following Ovsynch and Co-Synch Protocols Of Estrus Synchronization In West Sumatra

Udin¹,

Hendri²,

Masrizal³

2017

International Journal on Advanced Science, Engineering and Information Technology

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The fertility of cows was affected by the diameter of ovulating follicle size of the native cows. The objective of the present study is to determine the ovulating follicle diameter and conception rate of native PESISIR cows. This study used the synchronization program of 29 cows in OVSYNCH protocol and 33 cows in Co-synch protocol of native Pesisir cows in parity-3 with a body condition score of 3.0. Ultrasonography examination was conducted at GnRH1, PGF2α, and GnRH2 of OVSYNCH and co-synch protocols 30 days after the breeding period to determine the follicular size and conception rate of local cows. The result shows that the diameter of the ovulating follicle is a small follicle category ranging from 6 to 11 mm. The proportion of medium category of follicle size (8-9.5 mm) is 72.41 % for OVSYNCH protocol and 75.75 % for the co-synch protocol (P>0.05). The mean of ovulating follicle is 7.19 ± 1.69 mm for OVSYNCH protocol and 8.57 ± 1.61 mm for the co-synch protocol (P>0.05). The mean of conception rate is 72.00 % for OVSYNCH protocol and 68.44 % for the co-synch protocol (P.>0.05). The mean of progesterone concentration of ovsynch protocol is 6.76 ; 4,92; 5.44 and 9,56 ng/ml at GnRH-1; PGF2 alpha ; GnRH-2 injection and 30 d post-AI, respectively. In cosynch protocol progesterone concentrations are 6.36; 3.36; 1.92 and 7.84 ng/ml, at GnRH-1; PGF2 alpha; GnRH-2 and 30 d post-AI, respectively. This study concludes that follicle size is the key to determining the fertility of cows. The follicle diameter of local cows has a small category. Ovsynch and co-synch protocols have no significant effects (P>0.05)on both the ovulation and conception rates and the progesterone concentration of local PESISIR cows.

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“…The positive correlation between the follicle diameter on day 0 and the CL diameter on day 8 that we detected was also observed in cows (40,41), ewes (42), and mares (43)(44)(45) and could be because the size of the pre-ovulatory follicle would regulate the size of the CL in its early stages, mainly due to a spatial constraint (46). Nevertheless, the vertical diameter of the CL on day 8 was similar between pregnant females (Group I+) and non-pregnant females (Groups I-and II).…”

Section: Figure 4 |supporting

confidence: 86%

Uterine and Corpus Luteum Blood Flow Evaluation Prior to Uterine Flushing in Llama Embryo Donors

et al. 2020

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The aim of this study was to assess the uterine blood flow (UBF) and corpus luteum blood flow (CLBF) in llamas 8 days post-mating, using color-Doppler ultrasonography (CDU), to determine the possible relationship between vascularization and the presence of an embryo. Adult females ( n = 25) were used to monitor ovarian dynamics by palpation and transrectal ultrasonography until detection of a ≥6 mm growing follicle. Females were randomly assigned to one of two groups: Group I ( n = 19), were mated and ovulation was induced by a single dose of buserelin (GnRH analog) that same day (Day 0); and Group II ( n = 6), only ovulation was induced (control). On Day 8, UBF and CLBF were evaluated transrectally in both groups. The color-flow images obtained were analyzed with Image J1.52a software to determine the vascularization area and the percentage of corpus luteum with blood flow emission (CLBF%) together with the percentage for each uterine horn (UBF%). Statistical analysis was performed using an ANOVA test. In Group I, uterine flushing was performed to obtain the embryos, thus dividing the females into Group I+ ( n = 10), when an embryo was recovered and Group I- ( n = 9), when no embryo was recovered. Embryo recovery rate was 52.63% (10/19). In Group I+, UBF% was significantly higher compared to Group I- and Group II ( P <0.05). UBF appears to be a good predictor for embryo presence, with an area under the curve (AUC) of 0.9 and an optimal cut-off value of 9.37% (with a sensitivity of 90% and specificity of 88.9%). The CLBF% did not differ between groups ( P > 0.05). In conclusion, it is possible to detect a local increase of UBF in the presence of an embryo on day 8 post-mating in llamas. This could be useful to achieve an early pregnancy diagnosis or to decide whether to carry out the uterine flushing in a llama embryo transfer program.

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Relationships between follicle and corpus luteum diameter, blood flow, and progesterone production in beef cows and heifers: preliminary results

Cited by 24 publications

References 69 publications

Effects of hCG administration on accessory corpus luteum formation and progesterone production in estrous-induced nulliparous Santa Inês ewes

Effects of hCG administration on accessory corpus luteum formation and progesterone production in estrous-induced nulliparous Santa Inês ewes

Fertility In Local Pesisir Cattle Following Ovsynch and Co-Synch Protocols Of Estrus Synchronization In West Sumatra

Uterine and Corpus Luteum Blood Flow Evaluation Prior to Uterine Flushing in Llama Embryo Donors

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