Conceptus development, uterine response, blood gases and endocrine function of gilts exposed to increased ambient temperature during early pregnancy.

Conceptus development, uterine response, blood gases and endocrine function of gilts exposed to increased ambient temperature during early pregnancy. Research Abstract Details 

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Conceptus development, uterine response, blood gases and endocrine function of gilts exposed to increased ambient temperature during early pregnancy. Abstract Text:

R P Wettemann,F W Bazer,W W Thatcher,D Caton,R M Roberts,

Fifteen crossbred gilts were used to determine the influence of heat stress during Days 8 to 16 after onset of estrus on the development of conceptuses and uterine and endocrine functions. Ten gilts were bred 12 and 24 h after the onset of estrus (Day 0), and five gilts were nonbred controls. On Day 5, catheters were inserted into the uterine-ovarian vein (UV), saphenous artery (SA) and saphenous vein (SV) of each gilt. An electromagnetic blood flow transducer was implanted around the main uterine artery. Pregnant (n=5) and nonbred (n=5) control gilts were exposed to 21 +/- 1 degrees C, and pregnant heat-stressed gilts (n=5) were exposed to 37 +/- 1 degrees C for 12 h and 32 +/- 1 degrees C for 12 h daily during Days 8 through 16 after estrus. Treatment did not influence the partial pressure of oxygen (PO(2)) and of carbon dioxide (PCO(2)) in the UV, SA and SV blood. Uterine blood flow was not altered by heat stress. On Day 16, total wet weight of conceptuses was reduced in the gilts that were heat-stressed compared with conceptuses from control gilts. Incorporation of (3)H-leucine into macromolecules in vitro by conceptuses from the heat-stressed gilts was reduced compared with control gilts. Concentrations of 15-keto-13, 14-dihydro prostaglandin F(2alpha) (PGFM) in peripheral blood were greater than 1 ng/ml between Days 13 to 16 after estrus in 20% of the pregnant control gilts, 60% of the heat-stressed pregnant gilts, and 100% of the nonbred gilts. Concentrations of estradiol in the SA were affected by treatment. These results indicate that heat stress of gilts between Days 8 to 16 after estrus reduced the amount of conceptus tissue and altered concentrations of estradiol in the peripheral circulation, but uterine blood flow and PO(2) and PCO(2) in blood were not affected.

Conceptus development, uterine response, blood gases and endocrine function of gilts exposed to increased ambient temperature during early pregnancy. Publishing Authors By Initials

RP Wettemann,FW Bazer,WW Thatcher,D Caton,RM Roberts,

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Conceptus development, uterine response, blood gases and endocrine function of gilts exposed to increased ambient temperature during early pregnancy. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Theriogenology

VOLUME: 30

Page Numbers: 57-74

Journal Abbreviation: Theriogenology

ISSN: 0093-691X

DAY: 26

MONTH: Jul

YEAR: 1988

Conceptus development, uterine response, blood gases and endocrine function of gilts exposed to increased ambient temperature during early pregnancy. Information

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LANGUAGE: eng

NlmUniqueID: 421510

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Grant and Affiliation Information for Conceptus development, uterine response, blood gases and endocrine function of gilts exposed to increased ambient temperature during early pregnancy.

AFFILIATION: Animal Science Department, Oklahoma Agricultural Experiment Station, Stillwater, OK 74078 USA.

Country: United States

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MEDLINETA: Theriogenology

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