نتایج جستجو برای: estrous

تعداد نتایج: 3701  

2005
J. C. Dalton S. Nadir M. Noftsinger J. Bame R. G. Saacke

Estrous synchronization programs provide an organized and efficient approach to administering artificial insemination (AI) and the improvement of reproductive performance. Synchronization programs facilitate AI by altering the length of the estrous cycle and (or) through manipulation of follicular growth, thereby making the occurrence of estrus more predictable or allowing for appointment breed...

Journal: :Genetics and molecular research : GMR 2015
J R Li T Shen

We investigated the expression characteristics of matrix metalloproteinases (MMP)-2 and MMP-9 in the ovaries of normal adult guinea pigs during the estrous cycle. The estrous cycle was classified according to the appearance of the vaginal orifice and by vaginal exfoliated cell smears. Guinea pigs that had experienced at least two normal estrous cycles were selected. Ovaries were collected from ...

Journal: :Ethnicity & disease 2008
Tipyamol Niyomchai Karen Weirstall Shirzad Jenab Vanya Quiñones-Jenab

Fluctuations in ovarian hormones throughout the estrous cycle may underlie sex differences in behavior. In this study, estrogen plus progesterone were coadministered at different ratios to determine whether the interaction of those hormones during the estrous cycle contributes to cocaine-induced alterations in behavior. Before cocaine (15 mg/kg) or saline administration, ovariectomized female r...

Journal: :Journal of Applied Veterinary Sciences (Print) 2023

The aim of the present work was to investigate deleterious effects first dose medroxyprogesterone acetate (MPA) on female genital system cats. study conducted 315 cats different breeds who received their (75 mg) MPA as a contraceptive. Complete animal identification and stage estrus were documented at admission. Physical, radiographic ultrasonographic examinations done that expressed manifestat...

2017
S. K. Johnson J. R. Jaeger

Response to most estrous synchronization programs is improved in cycling females, compared to pre-pubertal heifers or anestrus cows. Cycling status is often monitored for research purposes by measuring progesterone concentrations in serum. Producers may want to use information on cyclicity status when determining which estrous synchronization program to use or as a component of their heifer sel...

Journal: :Psychoneuroendocrinology 1981
M Steiner R J Katz G Baldrighi B J Carroll

(1) The estrous cycle in the rat may be used to study recurrent changes in motor behaviors and motivation which are strongly related to cyclic hormonal and CNS changes. (2) The peak in motivated behaviors occurs during a sharply defined period on the night between proestrus and estrus and is evident in facilitated wheel-running, lordosis, and intracranial self-stimulation. (3) Behaviors without...

Journal: :iranian journal of applied animal science 2013
m.z. lattoo s. prasad h.p. gupta a. hussain

the present study was designed to investigate the impact of exogenous administration of gnrh (receptal vet®, intervet pharmaceuticals ltd., india) on serum progesterone profile and conception rates during mid luteal phase of estrous cycle in buffaloes. estrus was induced using cyclix 2 ml. i/m. (intervet india pvt. ltd., india) and animals were bred naturally during observed estrus. the buffalo...

Journal: :Experimental animals 2005
Hiroe Kon Atsushi Tohei Ryoji Hokao Motoo Shinoda

The estrous cycle influence on the number of ovulated eggs after injection of pregnant mare serum gonadotropin (PMSG) and human chorionic gonadotropin (hCG) was investigated in 12, 18, and 24 weeks old adult female Wistar-Imamichi (WI) rats. PMSG (150 IU/kg) was injected at metestrus, diestrus, proestrus, or estrus, followed by hCG (75 IU/kg) 55 h later. Ovulation was induced at all ages and st...

Journal: :American journal of physiology. Regulatory, integrative and comparative physiology 2002
O L Johnson K J Berkley

Recent evidence suggests that lower urinary tract functions may be influenced by reproductive status, particularly under pathophysiological conditions. This study used repeated cystometrograms via a transurethral catheter to investigate the influence of estrous stage on micturition thresholds before and after turpentine-induced bladder inflammation in urethane-anesthetized female rats. Whereas ...

Journal: :Reproductive biology 2012
Muhammad Modu Bukar Rosnina Yusoff Omar Mohammed Ariff Abd Wahid Haron Gurmeet Kaur Dhaliwal Soh Win Naing Mohammed Azam Khan

The effects of estrus synchronization with prostaglandin F(2α) (PGF(2α)) and Controlled Internal Drug Release Device (CIDR) on ensuing antral follicular development were documented and compared to natural estrous cycles of non-seasonal tropical goats. Two to six follicular waves were observed, with the three-follicular wave pattern being most frequently observed (58%), followed by four follicul...

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