Pharmacologically-induced luteolysis or treatment with an antiprogestin in early post-implantation pregnancy in dogs results in asynchronous death and resorption of conceptuses, indicating variable rates of response of individual conceptuses towards progesterone deficiency. This variability also seems to occur in bitches showing pregnancy failure in response to spontaneous luteal deficiency. In...

Abstract The study was conducted to identify effects of a decreased interval progesterone on the ovulatory follicle before fixed-timed artificial insemination (FTAI) by altering day gonadotropin-releasing hormone agonist (GnRH;00µg gonadorelin; Cystorelin) administration. Evaluation 7 & Synch and altered estrous synchronization protocols done using estrus expression (EE) FTAI pregnancy rate...

induced abortion may be desired during a normal or abnormal pregnancy. the methods of induced abortion differ between species mainly because of different sources for progesterone production during pregnancy between species and within a species according to different stages of gestation. in cows and buffaloes, pregnancy can be effectively terminated from 5 to 150 days by administration of luteol...

the aim of this study was to evaluate the effect of ecg, pgf2α, and combination of ecg and pgf2α early postpartum on reproductive performance in high producing dairy cows. three hundred sixty eight postpartal holstein dairy cows were divided in 4 groups. cows in groups 1 and 2 received 500 iu ecg on day 8 ± 2 and cows in groups 3 and 4 received saline. cows in groups 1 and 3 received injections...

Background: Recent studies have been conducted with the aim of improving fertility rates in FTAI programs beef females. The observation estrus expression constitutes an important indicator zebu Therefore, this work has as objective to evaluate impact on follicular, luteal and morphofunctional characteristics Nelore females synchronized for FTAI.Materials, Methods & Results: Sixty five lacta...

The corpus luteum (CL) is a transient endocrine organ that secretes progesterone to support pregnancy. The CL is formed from an ovulated follicle in a process that involves extensive angiogenesis and tissue remodeling. If fertilization does not occur or implantation is unsuccessful, the CL will undergo regression, which involves extensive tissue degradation. Extracellular proteases, such as ser...

INTRODUCTION By definition pyometra is a pus-filled uterus. Pyometra is typically a post-oestral syndrome in adult bitches associated with a variety of clinical and pathological manifestations of genital and multisystemic disease. Pyometra is most commonly associated with polydipsia, polyuria, abdominal distension, vomition, poor appetite, weight loss and anaemia. A purulent vaginal discharge m...

Background:Progesterone (P4) is essential for embryonic development and maintenance of pregnancy when deficiency causes early loss. In this study, we investigated the ability hormonal supplementation to improve fertility cows subjected fixed-time artificial insemination (IATF) protocols. Here, evaluated effect long-acting injectable progesterone (iP4) in D4 after IATF on rate loss Nellore (Bos ...

Embryonic mortality after embryo transfer causes substantial economic losses in the cattle industry. This has been related to the inability of the corpus luteum (CL) to secrete enough progesterone (P4) to prepare the endometrium for embryo implantation and maintain pregnancy. Thus, the objective of this experiment was to evaluate the effects of treatments that induce ovulation of a persistent f...