U.S. flag

An official website of the United States government

PubAg

Main content area

You searched for: Subject "ovulation" Remove constraint Subject: "ovulation"
Start Over

Search

3,849  Search Results

« Previous | 1 - 20 of 3,849 |
Number of results to display per page

Search Results

1. Side of ovulation at each end of two- and three-wave interovulatory intervals and before and after pregnancy in cattle

Author:
Ginther, O.J.; Nunes da Silva, Polyanna; Gomez-León, Victor E.; Domingues, Rafael R.; Inskeep, E.K.
Source:
Animal reproduction science 2021 v.229 pp. 106758
ISSN:
0378-4320
Subject:
ovulation,   etc   ; cattle; pregnancy;     Show all 3 Subjects
Abstract:
... The side of ovulation (left ovary, LO; right ovary, RO) and side of the next ovulation were compared between (1) beginning and end of an interovulatory interval (IOI) and beginning and end of consecutive sets of two and three IOI (n = 900 IOI), (2) beginning and end of the IOI for two and three follicular waves per IOI (n = 1300), and (3) beginning of pregnancy and first postpartum ovulation (n = ...
DOI:
10.1016/j.anireprosci.2021.106758

2. Concentrations of progesterone and a PGF2α metabolite during the interovulatory interval compared to the corresponding days of pregnancy in mares

Author:
Castro, T.; Jacob, J.C.; Stefani, G.; Domingues, R.R.; Ginther, O.J.
Source:
Theriogenology 2021 v.165 pp. 10-17
ISSN:
0093-691X
Subject:
ovulation,   etc   ; blood; luteolysis; metabolites; pregnancy; progesterone;     Show all 6 Subjects
Abstract:
... The concentrations of progesterone (P4) and a metabolite of PGF2α (PGFM) in mares were compared between the interovulatory interval (IOI; n = 8) and the corresponding days of pregnancy (n = 9). In daily blood samples, P4 increased between the day of ovulation (Day 0) and ∼Day 6 and then gradually decreased until the beginning of luteolysis in the IOI group. Before the beginning of luteolysis, ther ...
DOI:
10.1016/j.theriogenology.2021.02.004

3. Evidence for the LH-releasing pathway of seminal plasma NGF in male camelids

Author:
Carrasco, Rodrigo A.; Pezo, Sergio; Adams, Gregg P.
Source:
Theriogenology 2021 v.164 pp. 100-104
ISSN:
0093-691X
Subject:
ovulation,   etc   ; ; Camelidae; females; males; seminal plasma; testosterone;     Show all 7 Subjects
Abstract:
... In the female camelid, systemic administration of NGF induces a preovulatory LH surge that results in ovulation, but the effects of seminal NGF in the male are unknown. In the present study, we tested the hypothesis that the LH-releasing pathway of NGF is present in male camelids. In Experiment 1, male llamas and alpacas were treated with NGF or GnRH (n = 2 llamas and 3 alpacas) and blood samples ...
DOI:
10.1016/j.theriogenology.2021.01.014

4. Characteristics of follicular dynamics and reproductive hormone profiles during oestrous cycles of jennies over an entire year

Author:
Li, Nan; Yang, Feng; Yu, Jie; Yang, Weigang; Wu, Shuaishuai; Ma, Jinliang; Liu, Bing; Zhang, Ruitao; Zhou, Xiangshan; Losinno, Luis; Miragaya, Marcelo H.; Zeng, Shenming
Source:
Reproduction in domestic animals 2021 v.56 no.3 pp. 448-458
ISSN:
0936-6768
Subject:
ovulation,   etc   ; asses; blood; estrous cycle; herds; ultrasonography;     Show all 6 Subjects
Abstract:
... Although donkeys have been domesticated for over 6,000 years, limited information is available concerning their reproductive physiology, especially under intensive rearing conditions. The aims of this experiment were to study follicular dynamics and reproductive hormone variation in jennies during the inter‐ovulatory interval in different seasons. A total of 12 continuous cycles of six Dezhou Blac ...
DOI:
10.1111/rda.13883

5. Transient suppression of ovulatory ovarian function in pony mares after treatment with slow-release deslorelin implants

Author:
Kaps, M.; Okada, C.T.C.; Gautier, C.; Aurich, J.; Scarlet, D.; Kuhl, J.; Aurich, C.
Source:
Domestic animal endocrinology 2021 v.74 pp. 106505
ISSN:
0739-7240
Subject:
ovulation,   etc   ; deslorelin acetate; estrous cycle; progesterone; ultrasonography;     Show all 5 Subjects
Abstract:
... Behavior during the estrous cycle of mares can affect their performance and therefore inhibition of cyclical ovarian activity is indicated. We hypothesized that implants containing the GnRH analog deslorelin downregulate GnRH receptors and inhibit ovulation in mares. The estrous cycles of Shetland mares were synchronized with 2 injections of a PGF₂α analog. One day after the second injection (day ...
DOI:
10.1016/j.domaniend.2020.106505

6. Intraovarianism and differences in ovulation frequency between left and right ovaries in Bos taurus heifers

Author:
Ginther, O.J.; Gomez-León, Victor E.
Source:
Reproductive Biology 2020 v.20 no.3 pp. 333-337
ISSN:
1642-431X
Subject:
ovulation,   etc   ; animal ovaries; heifers;     Show all 3 Subjects
Abstract:
... Sides of ovulation at beginning and end of an interovulatory interval (IOI) were studied for 10 successive ovulations in each of 100 heifers (1000 ovulations, 900 IOI). The frequency of side for 1000 ovulations was less (P < 0.0002) for the left ovary (LO or L; 44.4 %) than for the right ovary (RO or R; 55.6 %). Number of observed ratios of L to R was determined within each of 100 sets of 10 ovula ...
DOI:
10.1016/j.repbio.2020.05.006

7. Superstimulation of ovarian follicles in cattle: Gonadotropin treatment protocols and FSH profiles

Author:
Bó, Gabriel A.; Mapletoft, Reuben J.
Source:
Theriogenology 2020 v.150 pp. 353-359
ISSN:
0093-691X
Subject:
ovulation,   etc   ; cattle; oocytes; superovulation;     Show all 4 Subjects
Abstract:
... The objective of ovarian superstimulatory treatments in cattle is to obtain the maximum number of viable embryos by stimulating growth of antral follicles and ovulation of competent oocytes. While factors inherent to the donor animal are critical, an increased knowledge of ovarian physiology, gonadotropin biochemistry and the ability to manipulate ovarian function have provided alternatives for th ...
DOI:
10.1016/j.theriogenology.2020.02.001

8. Effect of One-Day Delaying CIDR Administration in 5-Day Cosynch Protocol in Dairy Heifers

Author:
Pancarci, Sükrü Metin; Güngör, Örsan; Harput, Osman; Calisici, Oguz
Source:
Animals 2021 v.11 no.5
ISSN:
2076-2615
Subject:
ovulation,   etc   ; Holstein; artificial insemination; estrus; ovarian follicles; pregnancy; progesterone; protocols;     Show all 8 Subjects
Abstract:
... Effect of one-day delaying progesterone administration at the beginning of 5-day Cosynch protocol was investigated in Holstein heifers for the first artificial insemination (AI). Heifers received a synchronized ovulation and timed AI (TAI) with CIDR inserted on day (d) 0 (CIDR-5; n = 206) or d 1 (CIDR-4; n = 192). In both group, GnRH was administered on d 0 followed by a single PGF₂α injection and ...
DOI:
10.3390/ani11051402

9. Pharmacological approaches to induce follicular growth and ovulation for fixed-time artificial insemination treatment regimens in ewes

Author:
Silveira, D.C.; Vargas, S.F.; Oliveira, F.C.; Barbosa, R.M.; Knabah, N.W.; Goularte, K.L.; Vieira, A.D.; Baldassarre, H.; Gasperin, B.G.; Mondadori, R.G.; Lucia, T.
Source:
Animal reproduction science 2021 v.228 pp. 106734
ISSN:
0378-4320
Subject:
ovulation,   etc   ; artificial insemination; blood serum; estradiol; estrus; progesterone;     Show all 6 Subjects
Abstract:
... In Experiment I, during the non-breeding season, after intravaginal devices containing progesterone (P₄) were withdrawn (n = 28), estrous rates were greater with treatment with 400 IU eCG (P < 0.05) than with FSH (10 and 15 mg) and no treatment. During the breeding season (n = 147), estrous and pregnancy rates after fixed-time artificial inseminations (FTAI) were similar among groups: 300 IU eCG; ...
DOI:
10.1016/j.anireprosci.2021.106734

10. Vaginal cytology and cervical mucus as tools to predict ovulation time in small ruminants

Author:
Souza-Fabjan, Joanna Maria Gonçalves; Brair, Viviane Lopes; dos Santos Silva, Dafne; Schmidt, Ana Paula Pereira; Figueira, Lucas Machado; Rangel, Paulo Sérgio Cerqueira; Vergani, Gabriel Brun; de Oliveira Machado, Vitória; Oliveira, Maria Emilia Franco; da Fonseca, Jeferson Ferreira
Source:
Tropical animal health and production 2021 v.53 no.2 pp. 223
ISSN:
0049-4747
Subject:
ovulation,   etc   ; animal health; cell biology; cervical mucus; estrus; progesterone; ultrasonics;     Show all 7 Subjects
Abstract:
... The possibility of using cervical mucus and vaginal cytology as tools to predict ovulation time was assessed in 11 ewes and 11 does raised under tropical conditions. Every 12 h from progesterone removal to ovulation, estrus behavior, cervical mucus, vaginal cytology, and ovarian ultrasound exams were performed. In goats, vaginal cytology had 88% of accuracy on detecting the ovulation time. However ...
DOI:
10.1007/s11250-021-02667-6

11. The Use of hCG for Inducing Ovulation in Sheep Estrus Synchronization Impairs Ovulatory Follicle Growth and Fertility

Author:
Bruno-Galarraga, Macarena; Cano-Moreno, Virginia; Lago-Cruz, Beatriz; Encinas, Teresa; Gonzalez-Bulnes, Antonio; Martinez-Ros, Paula
Source:
Animals 2021 v.11 no.4
ISSN:
2076-2615
Subject:
ovulation,   etc   ; estrus; estrus synchronization; ovarian follicles; pregnancy rate; sheep;     Show all 6 Subjects
Abstract:
... Currently, there is an intense effort to find an alternative hormone to eCG to induce ovulation after estrus synchronization treatments in sheep. One of the proposed alternatives is based on the use of hCG, but the results are controversial since fertility rates are commonly affected. The present study aims to evaluate, therefore, the adequacy of hCG in protocols for the synchronization of estrus ...
DOI:
10.3390/ani11040984

12. Effect of estradiol preceding and progesterone subsequent to ovulation on proportion of postpartum beef cows pregnant

Author:
Ciernia, L.A.; Perry, G.A.; Smith, M.F.; Rich, J.J.; Northrop, E.J.; Perkins, S.D.; Green, J.A.; Zezeski, A.L.; Geary, T.W.
Source:
Animal reproduction science 2021 v.227 pp. 106723
ISSN:
0378-4320
Subject:
ovulation,   etc   ; beef; embryo transfer; estradiol; estrus; pregnancy rate; progesterone;     Show all 7 Subjects
Abstract:
... Two experiments were conducted to examine the effect of plasma concentrations of 17β-estradiol (E₂) preceding and progesterone (P₄) subsequent to ovulation on proportions of beef cows pregnant following embryo transfer. Timing of ovulation (d 0) among postpartum cows was synchronized and cows that expressed estrus were removed from each study. In Experiment 1, plasma E₂ concentration on d 0 was us ...
DOI:
10.1016/j.anireprosci.2021.106723

13. Roles of melatonin in the teleost ovary: A review of the current status

Author:
Takahashi, Takayuki; Ogiwara, Katsueki
Source:
Comparative biochemistry and physiology 2021 v.254 pp. 110907
ISSN:
1095-6433
Subject:
ovulation,   etc   ; antioxidant activity; circadian rhythm; melatonin; oocytes; pineal body; steroidogenesis;     Show all 7 Subjects
Abstract:
... Melatonin, the neurohormone mainly synthesized in and secreted from the pineal gland of vertebrates following a circadian rhythm, is an important factor regulating various physiological processes, including reproduction. Recent data indicate that melatonin is also synthesized in the ovary and that it acts directly at the level of the ovary to modulate ovarian physiology. In some teleosts, melatoni ...
DOI:
10.1016/j.cbpa.2021.110907

14. Changes Associated with the Peri-Ovulatory Period, Age and Pregnancy in ACTH, Cortisol, Glucose and Insulin Concentrations in Mares

Author:
Hicks, Gemma R.; Fraser, Natalie S.; Bertin, François-René
Source:
Animals 2021 v.11 no.3
ISSN:
2076-2615
Subject:
ovulation,   etc   ; corticotropin; cortisol; glucose; insulin; mares; pregnancy; progesterone;     Show all 8 Subjects
Abstract:
... Although there are many hormonal changes associated with reproduction, the effects of ovulation and early pregnancy on adrenocorticotropic hormone (ACTH) and insulin concentrations are poorly described. We hypothesise that both ovulation and early pregnancy will alter ACTH and insulin concentrations in healthy mares. Eighteen mares showing no clinical signs suggestive of, or laboratory findings co ...
DOI:
10.3390/ani11030891

15. Pre-synchronization of ovulation timing and delayed fixed-time artificial insemination increases pregnancy rates when sex-sorted semen is used for insemination of heifers

Author:
Oosthuizen, N.; Fontes, P.L.P.; Oliveira Filho, R.V.; Dahlen, C.R.; Grieger, D.M.; Hall, J.B.; Lake, S.L.; Looney, C.R.; Mercadante, V.R.G.; Neville, B.W.; Perry, G.A.; Powell, J.G.; Prezotto, L.D.; Seidel, G.E.; Walker, R.S.; Cardoso, R.C.; Pohler, K.G.; Lamb, G.C.
Source:
Animal reproduction science 2021 v.226 pp. 106699
ISSN:
0378-4320
Subject:
ovulation,   etc   ; artificial insemination; gonadotropin-releasing hormone; insemination; prostaglandins; semen;     Show all 6 Subjects
Abstract:
... This study was conducted to determine effects of pre-synchronization of ovulation timing among heifers and delayed fixed-time artificial insemination (TAI) with sex-sorted semen on proportion of heifers pregnant after TAI (PR/AI). Heifers were assigned to one of eight treatments: 1 and 2), 7-d CO-Synch + CIDR treatment regimen with administration of gonadotropin-releasing hormone and a CIDR insert ...
DOI:
10.1016/j.anireprosci.2021.106699

16. Resumption and progression of meiosis and circulating levels of steroids and prostaglandin F2α of Piaractus mesopotamicus induced by hypophysation with prostaglandin F2α

Author:
Sato, Rafael Tomoda; Kuradomi, Rafael Yutaka; Calil, Marina Cabral; de Jesus Silva, Laiza Maria; de Abreu, Mariana Roza; Figueiredo‐Ariki, Daniel Guimarães; de Freitas, Guilherme Antônio; Batlouni, Sergio Ricardo
Source:
Aquaculture research 2021 v.52 no.3 pp. 1026-1037
ISSN:
1355-557X
Subject:
ovulation,   etc   ; Piaractus mesopotamicus; aquaculture; fish; meiosis; prostaglandins; research; sodium chloride;     Show all 8 Subjects
Abstract:
... We have previously shown an increase on the ovulation rate of pacu, Piaractus mesopotamicus, using hypophysation with prostaglandin F₂α (PGF₂α) (HPG protocol) rather than hypophysation (H); only, however, a persistent lack of ovulation in some females could not be further explained by PGF₂α and steroid plasma levels at time of ovulation. Considering this, here we compared the meiotic process and s ...
DOI:
10.1111/are.14957

17. A phylogenetic approach to understand the evolution of reproduction in coleoid cephalopods

Author:
Ibáñez, Christian M.; Díaz-Santana-Iturrios, Mariana; López-Córdova, David A.; Carrasco, Sergio A.; Pardo-Gandarillas, M. Cecilia; Rocha, Francisco; Vidal, Erica A.G.
Source:
Molecular phylogenetics and evolution 2021 v.155 pp. 106972
ISSN:
1055-7903
Subject:
ovulation,   etc   ; Cephalopoda; Markov chain; habitats; life history; phylogeny; spawning;     Show all 7 Subjects
Abstract:
... A central question in the evolution of life-histories is whether organisms reproduce once or repeatedly. For cephalopods, the main differences between semelparous and iteroparous are based on ovulation pattern and spawning type. The different reproductive strategies in coleoid cephalopods could be related to the habitat in which the species dwell (coastal vs. oceanic) and/or to environmental force ...
DOI:
10.1016/j.ympev.2020.106972

18. 86 Ultrasonographic evaluation of preovulatory follicle and endometrial echo texture for ovulation prediction in Marwari mares

Author:
Yadav, D.; Jhamb, D.; Nirwan, S. S.; Gaur, M.
Source:
Reproduction, fertility, and development 2021 v.33 no.2 pp. 151
ISSN:
1031-3613
Subject:
ovulation,   etc   ; computer software; endometrium; estrus; prediction; texture; ultrasonics; ultrasonography;     Show all 8 Subjects
Abstract:
... The objective of the present study was to evaluate the application of ultrasonographic changes in the preovulatory follicle and uterus for ovulation prediction in Marwari mares. Mares (n=20) were teased daily by a teaser pony and, from the day of first detected oestrus, the ovaries and uterus were examined by transrectal ultrasonography using Exago ECM ultrasound equipped with linear rectal probe ...
DOI:
10.1071/RDv33n2Ab86

19. Effect of PGF2α treatments during early corpus luteum development on circulating progesterone concentrations and ovulation in breeding-age Holstein heifers

Author:
Martins, João Paulo N.; Acevedo, Melisa J.T.; Piterini, Christian G.; Cunha, Thiago O.; Pursley, J. Richard
Source:
Theriogenology 2021 v.173 pp. 12-18
ISSN:
0093-691X
Subject:
ovulation,   etc   ; Holstein; blood serum; cloprostenol; corpus luteum; dairy cattle; estrous cycle; lactation; progesterone;     Show all 9 Subjects
Abstract:
... The objective of this study was to test the effect of low circulating concentrations of progesterone (P4) on pre-ovulatory follicle development in heifers as part of an overarching objective to develop a model to understand this phenomenon in dairy cattle without the confounding factors of lactation. Holstein heifers between 12 and 13 mo of age were pre-synchronized to ensure all heifers were on d ...
DOI:
10.1016/j.theriogenology.2021.06.002

20. Development of a suitable manufacturing process for production of a bioactive recombinant equine chorionic gonadotropin (reCG) in CHO-K1 cells

Author:
Villarraza, Carlos Javier; Antuña, Sebastián; Tardivo, María Belén; Rodríguez, María Celeste; Mussio, Pablo; Cattaneo, Luciano; Fontana, Diego; Díaz, Pablo U.; Ortega, Hugo H.; Tríbulo, Andres; Macagno, Alejandro; Bó, Gabriel A.; Ceaglio, Natalia; Prieto, Claudio
Source:
Theriogenology 2021 v.172 pp. 8-19
ISSN:
0093-691X
Subject:
ovulation,   etc   ; bioactive properties; blood serum; cattle; equine chorionic gonadotropin; glycoproteins; markets; reproductive performance;     Show all 8 Subjects
Abstract:
... Equine chorionic gonadotropin (eCG) is a heterodimeric glycoprotein hormone produced by pregnant mares that has been used to improve reproductive performance in different domestic species. Several strategies to produce the hormone in a recombinant way have been reported; nevertheless, no approach has been able to produce a recombinant eCG (reCG) with significant in vivo bioactivity or in sufficien ...
DOI:
10.1016/j.theriogenology.2021.05.013