Secretion of PGF2alpha and oxytocin during hyperthermia in cyclic and pregnant heifers.

Secretion of PGF2alpha and oxytocin during hyperthermia in cyclic and pregnant heifers. Research Abstract Details 

Research Abstract Table of Contents

Jump to the:

Secretion of PGF2alpha and oxytocin during hyperthermia in cyclic and pregnant heifers. Abstract Text:

D Wolfenson,F F Bartol,L Badinga,C M Barros,D N Marple,K Cummins,D Wolfe,M C Lucy,T E Spencer,W W Thatcher,

The effects of acute heat stress (HS) and oxytocin (OT) injection on plasma concentrations of PGF2alpha and OT were examined in cyclic (C; n = 15) and pregnant (P; n = 11) dairy heifers. On Day 17 of synchronized estrous cycles, animals were randomly assigned to either thermoneutral (TN; 20 degrees C, 20% RH) or HS (42 degrees C, 60% RH) chambers. The jugular vein of each heifer was cannulated and blood samples collected hourly for 4 h, then every 15 min for an additional 3 h. Oxytocin (100 IU) was injected (IV) 5 h after the start of blood collection. Plasma samples were assayed subsequently for concentrations of 13,14-dihydro-15-keto PGF2alpha (PGFM) and OT. During the 7-h experiment, body temperature of HS heifers reached 41.2 degrees C as compared to 38.5 degrees C in control heifers. Plasma concentrations of PGFM increased (P<0.05) and peaked 30 min after OT injection in C (890 pg/ml) and P (540 pg/ml) heifers. In C heifers, heat stress failed to alter PGFM concentrations either before or after OT injection. In the P group, PGFM concentrations following OT injection tended to be higher in HS heifers were further TN heifers (peak values of 690 vs. 410 pg/ml). Pregnant TN and HS heifers were further classified as responders or non-responders to OT challenge according to a cutoff value for PGFM of 193 pg/ml (overall mean of C heifers minus 1 SD). Five of six HS and one of five TN pregnant heifers were classified as responders (P<0.06). Oxytocin concentrations in plasma prior to injection of exogenous OT were not affected by HS or pregnancy status. It is concluded that in C heifers, acute HS in vivo does not cause any further rise in PGF2alpha secretion. However, in P heifers, HS appears to antagonize suppressive effects of the embryo on uterine secretion of PGF2alpha, as indicated by the larger proportion of P heifers responding to OT challenge.

Secretion of PGF2alpha and oxytocin during hyperthermia in cyclic and pregnant heifers. Publishing Authors By Initials

D Wolfenson,FF Bartol,L Badinga,CM Barros,DN Marple,K Cummins,D Wolfe,MC Lucy,TE Spencer,WW Thatcher,

For similar abstracts research abstracts see: abstracts research

PUBMED ID PMID:

MEDLINE DATE:

Secretion of PGF2alpha and oxytocin during hyperthermia in cyclic and pregnant heifers. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Theriogenology

VOLUME: 39

Page Numbers: 1129-41

Journal Abbreviation: Theriogenology

ISSN: 0093-691X

DAY: 26

MONTH: May

YEAR: 1993

Secretion of PGF2alpha and oxytocin during hyperthermia in cyclic and pregnant heifers. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 421510

Secretion of PGF2alpha and oxytocin during hyperthermia in cyclic and pregnant heifers. Keywords Mesh Terms:

KEYWORDS:

MESH TERMS:

Chemical & Substance for Abstract: Secretion of PGF2alpha and oxytocin during hyperthermia in cyclic and pregnant heifers. Information

Substance Name:

Registry Number:

Grant and Affiliation Information for Secretion of PGF2alpha and oxytocin during hyperthermia in cyclic and pregnant heifers.

AFFILIATION: Department of Animal Science, Faculty of Agriculture Hebrew University, Rehovot 76100, Israel.

Country: United States

AGENCY:

GRANT:

ACRONYM:

MEDLINETA: Theriogenology

REFSOURCE:

DATABASENAME:

ACCESSION NUMBER:

Number Hits: 0

Secretion of PGF2alpha and oxytocin during hyperthermia in cyclic and pregnant heifers Related Publications

• Activation of estrogen receptor-mediated gene transcription by the equine estrogen metabolite, 4-methoxyequilenin, in human breast cancer cells.
• Antibiotics in foods: a review of some public health aspects.
• Benzothiophene selective estrogen receptor modulators with modulated oxidative activity and receptor affinity.
• Cloned ovarian cells from sheep: Cholesterol dependency in progesterone synthesis.
• Colon cancer chemoprevention by a novel NO chimera that shows anti-inflammatory and antiproliferative activity in vitro and in vivo.
• Concentration of phenylbutazone (PBZ) and 13, 14-dihydro-15 keto PGF(2alpha) (PGFM) in blood and seminal plasma of stallions treated with PBZ.
• Cortical reorganization in deaf children.
• Effects of calving-related disorders on prostaglandin, calcium, ovarian activity and uterine involution in postrartum dairy cows.
• Effects of dietary unsaturated fatty acids on oocyte quality and follicular development in lactating dairy cows in summer.
• Effects of postinsemination progesterone supplementation on fertility and subsequent estrous responses of dairy heifers.
• Embryonic development in superovulated dairy cattle exposed to elevated ambient temperatures between Days 1 to 7 post insemination.
• Fetal survival in the cow after pregnancy diagnosis by palpation per rectum.
• Follicular dynamics and superovulatory response in Holstein cows treated with FSH-P in different endocrine states.
• HEALTH PROBLEMS IN THE FOOD INDUSTRY.
• Influence of summer heat stress on pregnancy rates of lactating dairy cattle following embryo transfer or artificial insemination.
• Influences of in vitro oocyte aging on microfertilization in the mouse with reference to zona hardening.
• Potential mechanisms of estrogen quinone carcinogenesis.
• Pregnancy, bovine somatotropin, and dietary n-3 Fatty acids in lactating dairy cows: III. Fatty acid distribution.
• Pregnancy, bovine somatotropin, and dietary n-3 fatty acids in lactating dairy cows: I. Ovarian, conceptus, and growth hormone-insulin-like growth factor system responses.
• Pregnancy, bovine somatotropin, and dietary n-3 fatty acids in lactating dairy cows: II. Endometrial gene expression related to maintenance of pregnancy.
• Quinone formation as a chemoprevention strategy for hybrid drugs: balancing cytotoxicity and cytoprotection.
• Regulation of heat shock-induced alterations in the release of prostaglandins by the uterine endometrium of cows.
• Secretion of PGF2alpha and oxytocin during hyperthermia in cyclic and pregnant heifers.
• Structural modulation of reactivity/activity in design of improved benzothiophene selective estrogen receptor modulators: induction of chemopreventive mechanisms.
• Structure-activity relationships for a family of benzothiophene selective estrogen receptor modulators including raloxifene and arzoxifene.
• Survival improvement in thoracic cancer: progress from the last decade and beyond.
• The effects of ACTH on the renin-aldosterone system in normotensive man.
• The long-term pattern of adult mortality and the highest attained age.
• The place of targeted therapy in the patient management of non-small cell lung cancer.
• The role of potassium as cause of death in experimental trypanosomiasis.