Abstract:
:Dairy cattle are susceptible to heat stress-induced reductions in fertility; however, direct effects of hyperthermia on specific reproductive functions are difficult to determine in vivo. The objective of this experiment was to examine the effect of elevated temperature in vitro on follicular steroidogenesis, to gain insight into specific follicular responses associated with heat stress. Dominant follicles were obtained from Holstein heifers on day 6 post-estrus (luteal phase; n = 4) or day 8, 36 h after an injection with 25 mg PGF(2alpha) to induce regression of the corpus luteum (follicular phase; n = 4). Pieces of follicle wall were isolated from dominant follicles and cultured for 96 h with 0, 2 or 100 ng/ml LH or FSH at 37, 39 or 41 degrees C. Concentrations of androstenedione, estradiol and progesterone were determined in culture media collected every 24h. During the last 48 h of culture, basal secretion of androstenedione and estradiol by pieces of follicle wall was lower at 41 degrees C than at 37 or 39 degrees C (P < 0.05). In contrast, cumulative secretion of progesterone by pieces of follicle wall in medium alone was higher at 41 degrees C than at 37 or 39 degrees C (P < 0.05). Pieces of follicle wall responded to treatment with both low (2 ng/ml) and high (100 ng/ml) doses of gonadotropins at all temperatures. However, gonadotropin-induced secretion of androstenedione and estradiol was generally lower, whereas gonadotropin-induced secretion of progesterone was higher at 41 degrees C and sometimes at 39 than at 37 degrees C. The changes in basal steroidogenesis and in responses to gonadotropins suggest that follicular cells begin to luteinize at elevated temperatures in vitro. Premature luteinization of follicular cells in vivo has been associated with reduced fertility in cattle with persistent follicles, suggesting that the premature differentiation of follicular cells observed in the current study may be responsible, in part, for the reduced fertility of dairy cattle under heat-stressed conditions.
journal_name
Domest Anim Endocrinoljournal_title
Domestic animal endocrinologyauthors
Bridges PJ,Brusie MA,Fortune JEdoi
10.1016/j.domaniend.2005.02.017subject
Has Abstractpub_date
2005-10-01 00:00:00pages
508-22issue
3eissn
0739-7240issn
1879-0054pii
S0739-7240(05)00060-3journal_volume
29pub_type
杂志文章abstract::Reduced reproductive performance of lactating cows is strongly associated with environmental and pathogenic stressors. This review summarizes the most recent knowledge on the effects of acute or chronic heat stress (HS) and acute or chronic intramammary infection (IMI) on ovarian function. It also offers various appro...
journal_title:Domestic animal endocrinology
pub_type: 杂志文章,评审
doi:10.1016/j.domaniend.2016.02.013
更新日期:2016-07-01 00:00:00
abstract::Mammary gland growth and morphogenesis are regulated by interactions between hormones as much as by their individual actions. The effect of these interactions on the mammary gland phenotype in species other than rodents is relatively undefined. We investigated the individual and combined effects of estrogen (E), proge...
journal_title:Domestic animal endocrinology
pub_type: 杂志文章
doi:10.1016/j.domaniend.2009.04.002
更新日期:2009-08-01 00:00:00
abstract::The objective of this experiment was to develop a procedure for immunizing ewes against melatonin that would alter the effects of changing photoperiod on seasonal reproduction and prolactin secretion. Ewes were immunized against human serum albumin (HSA) as controls (n = 9) or a melatonin-human serum albumin conjugate...
journal_title:Domestic animal endocrinology
pub_type: 杂志文章
doi:10.1016/s0739-7240(99)00017-x
更新日期:1999-05-01 00:00:00
abstract::In this prospective study 16 cats with diabetes mellitus were examined for concurrent acromegaly by measuring plasma growth hormone (GH) and insulin-like growth factor-I concentrations, and magnetic resonance imaging (MRI) of the pituitary fossa. Additionally, the effects of octreotide administration on the plasma con...
journal_title:Domestic animal endocrinology
pub_type: 杂志文章
doi:10.1016/j.domaniend.2008.07.004
更新日期:2008-11-01 00:00:00
abstract::This is a test-report of ghrelin levels in plasma and proventriculus, the glandular portion of the avian stomach, by using a specific radioimmunoassay for acylated ghrelin, as well as the expression of the ghrelin gene in the proventriculus after a 12-h fasting period followed by a 6-h feeding period with 6-day-old la...
journal_title:Domestic animal endocrinology
pub_type: 杂志文章
doi:10.1016/j.domaniend.2006.03.006
更新日期:2007-05-01 00:00:00
abstract::The ability of gonadotropin-releasing hormone (GnRH) to synchronize ovulation and new follicular wave emergence before a "superovulatory Day 0" protocol was assessed in Santa Inês ewes. For estrus synchronization, a 60-mg medroxyprogesterone acetate sponge was inserted for 6 d. One day before sponge removal, 37.5-μg d...
journal_title:Domestic animal endocrinology
pub_type: 杂志文章
doi:10.1016/j.domaniend.2015.07.002
更新日期:2016-01-01 00:00:00
abstract::A selection project produced control cows from continuous matings with breed average bulls for predicted transmitting ability for milk (PTA-milk) in 1964 and select cows from matings to four of the highest PTA-milk bulls each year since 1964. Blood samples were collected in 1992 when milk yield difference of select an...
journal_title:Domestic animal endocrinology
pub_type: 杂志文章
doi:10.1016/0739-7240(96)00050-1
更新日期:1996-07-01 00:00:00
abstract::The three biologic activities most commonly associated with tumors that produce Humoral Hypercalcemia of Malignancy (HHM) include; 1) adenylate cyclase stimulating activity (PTH-like activity), 2) in vitro bone resorbing activity, and 3) transforming growth factor activity. The canine adenocarcinoma (CAC-8) model of H...
journal_title:Domestic animal endocrinology
pub_type: 杂志文章,评审
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更新日期:1988-01-01 00:00:00
abstract::Four experiments were conducted to evaluate the accuracy and reliability of noninvasive evaluation of cortisol in saliva of dogs. In experiment 1, we measured the cortisol concentration in the filter paper on which 250-μL cortisol solutions had been quantitatively pipetted and in filter papers dipped in cortisol solut...
journal_title:Domestic animal endocrinology
pub_type: 杂志文章
doi:10.1016/j.domaniend.2013.09.008
更新日期:2014-01-01 00:00:00
abstract::Remarkable diversity of size and health of offspring exists after normal pregnancies. When pregnancies are complicated by an extrinsic variable such as inappropriate maternal nutrition, birth weight and health of the neonate are substantially affected. The placenta is the organ through which respiratory gases, nutrien...
journal_title:Domestic animal endocrinology
pub_type: 杂志文章,评审
doi:10.1016/j.domaniend.2004.06.006
更新日期:2004-10-01 00:00:00
abstract::It is well established that GnRH can stimulate the release of LH and FSH in mammals. Two GnRHs have been found in the chicken hypothalamus, cGnRH-I and -II. There is controversy as to whether either peptide can stimulate release of FSH in birds. The present studies compared the ability of cGnRH-I and -II to stimulate ...
journal_title:Domestic animal endocrinology
pub_type: 杂志文章
doi:10.1016/j.domaniend.2005.10.002
更新日期:2006-08-01 00:00:00
abstract::The site within the hypothalamic-pituitary axis at which cortisol acts to inhibit luteinizing hormone (LH) secretion was investigated in female pigs. Six ovariectomized, hypophysial stalk-transected (HST) gilts were given 1 microgram pulses of gonadotropin releasing-hormone (GnRH) iv every 45 min from day 0 to 12. On ...
journal_title:Domestic animal endocrinology
pub_type: 杂志文章
doi:10.1016/0739-7240(91)90008-8
更新日期:1991-07-01 00:00:00
abstract::Experimentally induced fever is accompanied by a variety of hormonal changes, and there is evidence to suggest that some of these responses may be mediated by prostaglandins. However, little is known about the endocrine effects of peripherally administered prostaglandins, especially in domesticated species. In this st...
journal_title:Domestic animal endocrinology
pub_type: 杂志文章
doi:10.1016/0739-7240(94)00021-r
更新日期:1995-04-01 00:00:00
abstract::Water buffaloes are easily adaptable animals, whose raising and economical exploitation have been growing in the last three decades all over the world. Hyperstimulation of ovarian function in this species is a common technique aiming to improve reproductive performance. Superovulatory treatment affects corpus luteum (...
journal_title:Domestic animal endocrinology
pub_type: 杂志文章
doi:10.1016/j.domaniend.2006.07.003
更新日期:2007-11-01 00:00:00
abstract::The influence of phthalate esters di-2-ethylhexyl phthalate (DEHP) and mono-2-ethylhexyl phthalate (MEHP) on uterine prostaglandin (PGF2alpha and PGE2) and ovarian oxytocin secretion was investigated. Endometrial, granulosa, and luteal cells from cows on days 8-12 of the estrous cycle were treated with DEHP or MEHP (0...
journal_title:Domestic animal endocrinology
pub_type: 杂志文章
doi:10.1016/j.domaniend.2010.03.002
更新日期:2010-08-01 00:00:00
abstract::The embryo of the domestic fowl (Gallus domesticus) tenders one distinctive advantage over general mammalian models for investigating the development of the hypothalamo-pituitary-adrenocortical (HPA) axis. This is the relative simplicity with which the embryonic endocrine environment can be influenced without confound...
journal_title:Domestic animal endocrinology
pub_type: 杂志文章,评审
doi:10.1016/j.domaniend.2004.01.001
更新日期:2004-05-01 00:00:00
abstract::Eighteen crossbred boars, three siblings from each of six litters, were distributed randomly among three groups after weaning. The 'Natural long-day' group was housed in a standard room with windows, whereas the 'Artificial long-day' and 'Artificial short-day' groups were housed in light-sealed rooms and under an arti...
journal_title:Domestic animal endocrinology
pub_type: 杂志文章
doi:10.1016/s0739-7240(00)00083-7
更新日期:2000-11-01 00:00:00
abstract::In this study, we estimated insulin sensitivity and determined plasma concentrations of total-, low-molecular-weight (LMW), and high-molecular-weight (HMW) adiponectin and leptin in 72 domestic shorthair, neutered, client-owned cats. Glucose tolerance was assessed with an intravenous glucose tolerance test and body fa...
journal_title:Domestic animal endocrinology
pub_type: 杂志文章
doi:10.1016/j.domaniend.2013.11.006
更新日期:2014-04-01 00:00:00
abstract::Adrenocorticotropic hormone (ACTH) challenges are frequently performed in repetition when evaluating stress or welfare in animals. To our knowledge, the repeatability of ACTH challenges in cattle, although fundamental to further studies of this type, has not yet been the subject of research. Therefore, the objective o...
journal_title:Domestic animal endocrinology
pub_type: 杂志文章
doi:10.1016/j.domaniend.2019.03.001
更新日期:2020-07-01 00:00:00
abstract::The aim of the experiment was to determine the acute and chronic effects of the beta-agonist, cimaterol, on plasma hormone and metabolite concentrations in steers. Twelve Friesian steers (liveweight = 488 +/- 3 kg) were randomly assigned to receive either 0 (control; n = 6) or .09 mg cimaterol/kg body weight/day (trea...
journal_title:Domestic animal endocrinology
pub_type: 杂志文章
doi:10.1016/0739-7240(91)90016-d
更新日期:1991-10-01 00:00:00
abstract::Preliminary data suggest that prohormone convertase 1 (PC1/3) protein expression and proopiomelanocortin (POMC) processing are altered in large corticotroph tumors. The aim of this study was to characterize the levels of ACTH precursors and PC1/3 protein in small and large corticotroph tumors of dogs with Cushing's di...
journal_title:Domestic animal endocrinology
pub_type: 杂志文章
doi:10.1016/j.domaniend.2017.10.001
更新日期:2018-01-01 00:00:00
abstract::Leptin, mainly produced in adipose tissue (AT), is a protein involved in the central and/or peripheral regulation of body homeostasis, energy intake, storage and expenditure, fertility and immune functions. Its role is well documented in rodent and human species, but less in ruminants. This review is focused on some i...
journal_title:Domestic animal endocrinology
pub_type: 杂志文章,评审
doi:10.1016/j.domaniend.2005.02.026
更新日期:2005-07-01 00:00:00
abstract::In this study, immunization against chicken leptin receptor (cLEPR) extracellular domain (ECD) was applied to investigate leptin regulation and LEPR biofunction in growing chicken pullets. A recombinant protein (cLEPR ECD) based on the cLEPR complemenary DNA sequence corresponding to the 582nd to 796th amino acid resi...
journal_title:Domestic animal endocrinology
pub_type: 杂志文章
doi:10.1016/j.domaniend.2014.09.001
更新日期:2015-01-01 00:00:00
abstract::This study examined the role of the adrenergic system in the regulation of growth hormone (GH) secretion in sheep. Intravenous infusion of noradrenaline (0.5 microgram/kg per min for 2 hr) totally suppressed plasma GH concentrations. Concomitant treatment of animals with the beta-adrenergic antagonist propranolol comp...
journal_title:Domestic animal endocrinology
pub_type: 杂志文章
doi:10.1016/0739-7240(94)90026-4
更新日期:1994-04-01 00:00:00
abstract::The peroxisome proliferator-activated receptors (PPARs) are the members of superfamily of nuclear hormone receptors. A great number of studies in rodent and human have shown that PPARs were involved in the lipids metabolism. The goal of the current study was to investigate the expression pattern of PPAR genes in vario...
journal_title:Domestic animal endocrinology
pub_type: 杂志文章
doi:10.1016/j.domaniend.2004.05.003
更新日期:2005-01-01 00:00:00
abstract::An increasing demand for calcium during pregnancy and lactation can result in both clinical and subclinical hypocalcemia during the early lactation period in several mammalian species, in particular the dairy cow. Serotonin (5-HT) was recently identified as a regulator of lactation and bone turnover. The purpose of th...
journal_title:Domestic animal endocrinology
pub_type: 杂志文章
doi:10.1016/j.domaniend.2013.01.005
更新日期:2013-05-01 00:00:00
abstract::The separate and combined effects of Synovex-S (SYN) ear implants and thyroxine (T4)-5'-monodeiodinase inhibition (Trial 1) and T3 injection to create a mild elevation in circulating T3 concentrations (Trial 2) on BW gain and composition of gain were studied. Trial 1 used 24, 285-kg Angus steers in two experimental ph...
journal_title:Domestic animal endocrinology
pub_type: 临床试验,杂志文章
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更新日期:1992-07-01 00:00:00
abstract::A simple extraction and assay technique of estrone sulfate in bovine blood was developed with the object of detecting the peripheral level of estrone sulfate in a normal estrous cycle or in early pregnancy. Estrone sulfate in bovine plasma was extracted with a small reversed phase cartridge. The steroid conjugate reta...
journal_title:Domestic animal endocrinology
pub_type: 杂志文章
doi:10.1016/0739-7240(96)00013-6
更新日期:1996-05-01 00:00:00
abstract::Prolonged hyperinsulinemia is thought to be the cause of equine endocrinopathic laminitis, a common and crippling disease of the foot, for which there are no pharmacologic treatments other than pain relief. It has been suggested that insulin causes its effects on the lamellae by activating IGF-1 receptors (IGF-1R), as...
journal_title:Domestic animal endocrinology
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更新日期:2021-01-01 00:00:00
abstract::The objective of this study was to determine the effects of an immunomodulatory feed ingredient during post-weaning on growth and cortisol concentrations of beef heifers. Commercial Angus heifers (n = 72) from 2 AI sires were blocked (n = 9) by BW and randomly assigned to one of 2 pens per block. Each pen (4 heifers/p...
journal_title:Domestic animal endocrinology
pub_type: 杂志文章
doi:10.1016/j.domaniend.2019.106427
更新日期:2020-07-01 00:00:00