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The objective of this study was to examine conceptus development on Day 13 in ewes with estrous cycles of different durations. Ewes (n = 80) were screened according to the length of their estrous cycles. Subsequently, ewes that had either SHORT or LONG cycles were utilized (15.9 +/- 0.1 or 18.6 +/- 0.4 days; mean +/- SEM, p less than 0.01; 10 ewes per group). Jugular blood samples were collected twice daily from Days 0-6 after mating and then once a day until slaughter on Day 13. Concentrations of progesterone in plasma and amounts of ovine trophoblast protein-1 (oTP-1), protein, and prostaglandins (PG) E2 and F2 alpha (PGF2 alpha) in uterine flushings were determined. Concentrations of progesterone were greater (Day by treatment interaction, p less than 0.01) on Days 2-4 for ewes in the SHORT group. On Day 5 and thereafter, progesterone concentrations were not different between groups. More (p less than 0.05) oTP-1 and protein (8.1 +/- 1.3 micrograms and 1.8 +/- 0.3 micrograms versus 2.4 +/- 1.3 micrograms and 0.8 +/- 0.3 mg) were recovered from uterine flushings from ewes in the SHORT versus LONG groups, respectively. The ratio of PGE2:PGF2 alpha was higher (p less than 0.06) in flushings from ewes in the SHORT versus LONG group (1.4 +/- 0.2 versus 0.9 +/- 0.2, respectively). Conceptuses were classified by stage of morphological development. Conceptus development was accelerated (p less than 0.01) in ewes of the SHORT group, as shown by filamentous conceptuses recovered from 78% versus 0% of SHORT versus LONG ewes, respectively.(ABSTRACT TRUNCATED AT 250 WORDS)
K P Nephew, and
K E McClure, and
T L Ott, and
D H Dubois, and
F W Bazer, and
W F Pope
January 1989,
Reproduction, nutrition, development,
K P Nephew, and
K E McClure, and
T L Ott, and
D H Dubois, and
F W Bazer, and
W F Pope
March 2002,
Reproductive biology,
K P Nephew, and
K E McClure, and
T L Ott, and
D H Dubois, and
F W Bazer, and
W F Pope
August 1997,
Animal reproduction science,
K P Nephew, and
K E McClure, and
T L Ott, and
D H Dubois, and
F W Bazer, and
W F Pope
November 1993,
Biology of reproduction,
K P Nephew, and
K E McClure, and
T L Ott, and
D H Dubois, and
F W Bazer, and
W F Pope
March 2000,
Theriogenology,
K P Nephew, and
K E McClure, and
T L Ott, and
D H Dubois, and
F W Bazer, and
W F Pope
February 1995,
Theriogenology,
K P Nephew, and
K E McClure, and
T L Ott, and
D H Dubois, and
F W Bazer, and
W F Pope
July 2000,
Small ruminant research : the journal of the International Goat Association,
K P Nephew, and
K E McClure, and
T L Ott, and
D H Dubois, and
F W Bazer, and
W F Pope
July 2004,
Theriogenology,
K P Nephew, and
K E McClure, and
T L Ott, and
D H Dubois, and
F W Bazer, and
W F Pope
June 2002,
Journal of dental research,
K P Nephew, and
K E McClure, and
T L Ott, and
D H Dubois, and
F W Bazer, and
W F Pope
October 1968,
Journal of comparative and physiological psychology,
