Early Pregnancy Determination Using Serum Progesterone Concentration in Bighorn Sheep

1988 ◽  
Vol 52 (4) ◽  
pp. 610 ◽  
Author(s):  
Gary C. Brundige ◽  
Larry J. Layne ◽  
Thomas R. McCabe
Keyword(s):  
Early Pregnancy ◽  
Bighorn Sheep ◽  
Progesterone Concentration ◽  
Serum Progesterone

Association between serum progesterone concentration in early pregnancy and duration of pregnancy: a cohort study

2018 ◽  
Vol 33 (12) ◽  
pp. 2096-2102
Author(s):  
Song-Ying Shen ◽  
Qiao-Zhu Chen ◽  
Li-Fang Zhang ◽  
Jian-Rong He ◽  
Jin-Hua Lu ◽  
...  
Keyword(s):  
Cohort Study ◽  
Early Pregnancy ◽  
Progesterone Concentration ◽  
Serum Progesterone ◽  
Duration Of Pregnancy

The effect of bromocriptine during early pregnancy in the rat: inhibition of implantation

1980 ◽  
Vol 94 (2) ◽  
pp. 268-272 ◽  
Author(s):  
U. Müller ◽  
Th. Bauknecht ◽  
J. W. Siebers
Keyword(s):  
Body Weight ◽  
Early Pregnancy ◽  
Prolactin Secretion ◽  
Teratogenic Effect ◽  
Preimplantation Embryos ◽  
Progesterone Concentration ◽  
Serum Progesterone ◽  
Luteal Cells ◽  
Progesterone Production ◽  
Uterine Mucosa

Abstract. The increase in the number of the ovarian LH/hCG-receptors and of serum progesterone concentration during pregnancy in the rat is highly dependent on the presence of prolactin during the luteinization process. Blocking of the hypophyseal prolactin secretion by twice daily injections of 2 μg/g body weight bromocriptine into rats from the first day of pregnancy onwards prevents the increase in ovarian hCG-binding and progesterone production. Similar results are obtained by application of bromocriptine during the first three days only or either at day 1, 3 or 5 after mating. In all bromocriptine treated rats implantation of blastocysts does not occur. The failure to implant is not due to a teratogenic effect of bromocriptine onto preimplantation embryos, but is probably the consequence of changes of the uterine mucosa caused by the lack of progesterone production in the luteal cells.

Serum Endocrine Profile in Relation to Estrus Synchronization in Surti Does

2018 ◽  
Vol 13 (03) ◽  
Author(s):  
M. M. Chaudhary ◽  
C. T. Khasatiya ◽  
S. B. Patel ◽  
S. S. Chaudhary ◽  
V. B. Atara ◽  
...  
Keyword(s):  
Jugular Vein ◽  
Estrus Synchronization ◽  
Progesterone Concentration ◽  
Serum Progesterone ◽  
Blood Samples ◽  
Group Iii ◽  
Group I ◽  
Endocrine Profile ◽  
Group Ii ◽  
And Control

The serum progesterone and estradiol profiles during synchronization of estrus by buck effect and PGF2α treatments were monitored in Surti does. Total eighteen non-pregnant does selected were evenly divided into 3 groups, 6 does in each group. The does of Group I were teased with a sexuallyactive- apronized buck; and those of Group II were treated with PGF2α, i.e., Inj. Lutalyse® @ 7.5 mg/doe IM twice 11 days apart, while the Group III served as untreated control. Blood samples were collected from all the animals on day 0 (before 1st PGF2α injection), 3rd day (during treatment), 11th day (before 2nd PGF2α injection), 14th day (after treatment) and 40th day (post-service) by jugular vein puncture. The serum separated was stored at -20°C till further analysis. In all the three groups, 83.33% does, conceived at first service in the sampling cycle. The overall mean serum progesterone concentration of Group I does (5.82±0.72 ng/ml) was significantly higher (p less than 0.01) as compared to Group II (2.93±0.38 ng/ml) and III (2.88±0.30 ng/ml). Similarly, the overall mean serum progesterone concentration of Surti does on day 0 (2.65±0.46 ng/ml), 3rd (2.56±0.80 ng/ml), 11th (4.45±0.84 ng/ml) and 14th (3.40±0.63 ng/ml) did not differ significantly, but the overall mean level at day 40 (6.31±0.45 ng/ml) was significantly (p less than 0.01) higher, because most of animals became pregnant at that time. The overall mean serum oestradiol-17β levels of Group I (24.40±2.98 pg/ ml) was significantly higher (p less than 0.01) than in Group II (15.77±1.77 pg/ml) and III (12.21±1.45 pg/ ml). On the other hand, the overall mean serum oestradiol-17β levels of Surti does on day 0 (12.89±1.21 pg/ml), 3rd (15.84±1.74 pg/ml), 11th (14.81±1.96 pg/ml), 14th (22.15±2.97 pg/ml) and 40th (21.64±5.16 pg/ml) did not differ significantly (p>0.05) and the slightly higher overall mean level found at 40th day might be the influence of the non-pregnant does at first service in the cumulative animals. The hormonal profile reflected the initiation of cyclicity and establishment of pregnancy in treated and control animals.

Effects of Splenectomy on Luteal Function in Pseudopregnant Rabbits

1998 ◽  
Vol 26 (2) ◽  
pp. 93-97 ◽  
Author(s):  
T Endo ◽  
K Kanayama
Keyword(s):  
Immune System ◽  
Control Group ◽  
Progesterone Concentration ◽  
Serum Progesterone ◽  
Luteal Function

The involvement of the immune system in changes in luteal function was evaluated in rabbits. Pseudopregnancy was induced in 10 females and the spleens (considered to be the source of macrophages) of five were excised on day 7 of pseudopregnancy, while the five controls had sham splenectomies. Subsequent changes in serum progesterone concentrations were measured as an indicator of luteal function and luteolysis. A second pseudopregnancy was induced 31 days after splenectomy. The first pseudopregnancy was prolonged and during the second pseudopregnancy the serum progesterone concentrations on days 3 and 7 were much lower in the splenectomy group than in the control group. On day 14 of the second pseudopregnancy, the serum progesterone concentration markedly decreased in the control group while it remained almost at the level of day 7 in the splenectomy group. These results suggest that splenectomy suppresses the expression of luteal function and delays luteolysis in rabbits.

Shrinkage in the horizontal dimensions of the vulva (vulvar shrinkage) as an indicator of standing heat in the beagle

2000 ◽  
Vol 36 (6) ◽  
pp. 556-560 ◽  
Author(s):  
T Nishiyama ◽  
K Narita ◽  
S Tsumagari ◽  
M Takeishi
Keyword(s):  
Artificial Insemination ◽  
Clinical Signs ◽  
Optimal Time ◽  
Progesterone Concentration ◽  
Serum Progesterone ◽  
Lh Surge ◽  
Serum Luteinizing Hormone ◽  
Serum Lh ◽  
Vaginal Cytology ◽  
Estrous Behavior

During the proestrous and estrous periods in 12 beagles, the following parameters were measured daily: the horizontal dimensions of the vulva, vaginal cytology, and serum luteinizing hormone (LH) and progesterone concentrations. Measurements of serum LH concentrations allowed for the identification of the LH surge and the optimal time for artificial insemination (AI). Nine out of the 12 beagles became pregnant through AI and completed a gestation. Shrinkage in the horizontal dimensions of the vulva (i.e., vulvar shrinkage) was primarily observed prior and subsequent to the LH surge. In six of the nine (66.7%) beagles that became pregnant, vulvar shrinkage was observed on the days in which the LH surge was confirmed, and the rate of vulvar shrinkage tended to be greater at higher serum LH concentrations. Further vulvar shrinkage was identified in all nine beagles within two days of the LH surge. An increase in the serum progesterone concentration was observed after the LH surge in each of the beagles that became pregnant, together with clinical signs of estrous behavior (i.e., standing heat) as well as a change in vulva condition from swollen to soft. This demonstrates that vulvar shrinkage is induced in response to the onset of the LH surge and that the LH surge can be predicted through the measurement of the horizontal dimensions of the vulva, vaginal cytology, and the assessment of serum progesterone concentrations in beagles.

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