Influence of progesterone concentrations on secretory functions of trophoblast and pituitary during the first trimester of pregnancy in dairy cattle

Ayad, Abdelhanine; Sousa, Noelita Melo de; Sulon, Joseph; Hornick, Jean-Luc; Watts, J. E.; López‐Gatius, F.; Iguer-Ouada, Mokrane; Beckers, Jean‐François

doi:10.1016/j.theriogenology.2007.03.010

Cited by 46 publications

(29 citation statements)

References 54 publications

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“…In prior work, prolactin secretions in HF cows were related to other endocrine factors such as photoperiod, Neospora seropositivity, or lactation number [7,9,12]. In this study, pure-breed RG pregnancies showed the highest prolactin concentrations.…”

Section: Discussionsupporting

confidence: 48%

“…Prolactin concentrations were determined in plasma using a double antibody radioimmunoassay procedure [7] with some modifications. Bovine prolactin (NIH-B5 bPRL, National Institutes of Health, Bethesda, MD) was used as standard (0.8-200 ng/mL) and tracer.…”

Section: Endocrine Determinationsmentioning

confidence: 99%

“…As an antigenically foreign body, complex immunomodulation and endocrine interactions are required to induce maternal immunologic tolerance of the fetus [4][5][6]. In cows, as in other mammals, maternalfetal communication at the placental barrier orchestrates interactions between pregnancy immune-modulator hormones, such as prolactin, pregnancy associated glycoprotein (PAG)-1 and -2, and progesterone (P4) [7][8][9][10], and the maternal immune system detectable in peripheral circulation [11]. However, any chronic disease such as Neospora caninum infection can disrupt the normal maternal immune-endocrine pattern [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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Effects of crossbreeding on endocrine patterns determined in pregnant beef/dairy cows naturally infected with Neospora caninum

et al. 2015

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Section: Discussionsupporting

confidence: 48%

Section: Endocrine Determinationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of crossbreeding on endocrine patterns determined in pregnant beef/dairy cows naturally infected with Neospora caninum

et al. 2015

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“…According to Ayad et al (2007), higher concentrations of P 4 could promote a more suitable uterine environment for embryo development, resulting in a larger conceptus and greater production of trophoblastic proteins such as INF-τ and glycoproteins associated with conception, which unlike INF-τ, reach the maternal blood circulation and are used to diagnose pregnancy.…”

Section: Resultsmentioning

confidence: 99%

Administration of GnRH on the day of fixed-time artificial insemination (FTAI) and melengestrol acetate (MGA) administration after ftai in non-suckling nelore cattle

Silva¹,

Leão²,

Rodrigues³

et al. 2015

Sem. Ci. Agr.

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The present study evaluated the effect of administering buserelin acetate (GnRH) at the time of fixedtime artificial insemination (FTAI), along with the effect of oral administration of melengestrol acetate (MGA) after FTAI on conception rates in non-suckling Nelore cattle. In Experiment I, the effect of GnRH application at the time of FTAI was evaluated, as was administration of MGA from the 13 th through the 18 th day following FTAI (D24 to D29 after the initiation of the FTAI protocol). Experiment I was performed in 215 non-suckling cattle of the Nelore breed, divided into four experimental groups: Control group: 56 cows subjected to FTAI without GnRH injection; GnRH group: 51 cows subjected to GnRH at the time of FTAI; MGA Group: 57 cows subjected to FTAI without the application of GnRH with mineral supplementation and the addition of 2.28 g of MGA ® Premix per cow per day from D24 to D29 after the initiation of the FTAI protocol; MGA and GnRH group: 51 cows subjected to GnRH injection at the time of FTAI, with mineral supplementation and the addition of 2.28 g of MGA ® Premix per cow per day from D24 to D29 after the initiation of the FTAI protocol. In Experiment II, the effect of providing MGA five to ten days after FTAI was evaluated in 196 non-suckling pluriparous Nelore cows, divided into two groups: Control group: 104 cows subjected to FTAI, not supplemented with MGA; treated group: 92 cows supplemented with the addition of 2.28 g of MGA ® Premix per cow per day from D15 to D20 after the initiation of the FTAI protocol. Diagnosis of gestation was carried out 45 days after FTAI. Both experiments were conducted using a completely randomised design and analysed via the SAS MIXED procedure. In Experiment I, the control group displayed a lower conception rate (32.1%) compared with the groups administered GnRH, MGA, and both MGA and GnRH, which were respectively provided with MGA after FTAI (45.6%), GnRH at the time of FTAI (50.9%), and the combination of the two treatments (50.9%) (P<0.05). In Experiment II, the control group displayed a higher conception rate (40.38%) compared with the group receiving MGA post-FTAI (18.48%) (P<0.05). It was concluded that the injection of buserelin acetate (GnRH) at the time of FTAI and the oral administration of MGA ® Premix from the 13 th to the 18 th day after FTAI increased the conception rates in non-suckling Nelore cattle. However, when MGA ® Premix was administered orally from the fifth to tenth day post-FTAI, conception rates in non-suckling Nelore cattle were reduced.

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“…Progesterone (P4) is unequivocally required for supporting gestation [54], pregnancy maintenance has been positively correlated to plasma concentrations of P4 on Week 5 of gestation [55], and P4 concentrations influence secretory functions of trophoblasts and pituitary during the first trimester of gestation [56]. However, one of the consequences of high milk production is an increased metabolic rate linked to a greater dry matter intake.…”

Section: Prevention Of Pregnancy Losses By Pharmacological Treatmentmentioning

confidence: 99%

Recent Possibilities for the Diagnosis and Pharmacological Control of Pregnancy Loss in Dairy Cow

Szenci¹

2015

JLS

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Abstract:One of the most recent techniques for the diagnosis of EP (early pregnancy) in cattle on the farm is B-mode ultrasonography. Under field conditions, acceptable results may be achieved with ultrasonography from days 25 to 30 post-AI. The reliability of the test greatly depends on the frequency of the transducer used, the skill of the examiner, the criterion used for a positive PD (pregnancy diagnosis) and the position of the uterus in the pelvic inlet. Pregnancy protein assays (PAG, PSPB) may provide an alternative method to ultrasonography for determining EP or LEM/EFM (late embryonic/early foetal mortality) in the cow. Although early pregnancy factor is the earliest specific indicator for fertilization, its detection is entirely dependend on the use of the RIT (rosette inhibition test), therefore its use in the field needs further inventions. Preventive pharmaceutical treatments with hCG (human chorionic gonadotropin), GnRH (gonadotropin realising hormone), PRID (progesterone-releasing intravaginal device) or CIDR (controlled internal drug release) inserts at different time periods at or post-AI may have some benefit in decreasing PL (pregnancy loss), however further examinations are warranted to determine how and when these treatments may influence PL in the field.

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Influence of progesterone concentrations on secretory functions of trophoblast and pituitary during the first trimester of pregnancy in dairy cattle

Cited by 46 publications

References 54 publications

Effects of crossbreeding on endocrine patterns determined in pregnant beef/dairy cows naturally infected with Neospora caninum

Effects of crossbreeding on endocrine patterns determined in pregnant beef/dairy cows naturally infected with Neospora caninum

Administration of GnRH on the day of fixed-time artificial insemination (FTAI) and melengestrol acetate (MGA) administration after ftai in non-suckling nelore cattle

Recent Possibilities for the Diagnosis and Pharmacological Control of Pregnancy Loss in Dairy Cow

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