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United States Department of Agriculture

Agricultural Research Service

Title: Interrelationships among Day 11 Conceptus Size, Day 11 Uterine Protein Secretion, Day 105 Fetal Erythropoiesis and Day 105 Uterine Capacity

item Vallet, Jeffrey
item Klemcke, Harold - FORMER ARS EMPLOYEE
item Christenson, Ronald

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: March 26, 2001
Publication Date: June 28, 2001
Citation: Vallet, J.L., Klemcke, H.G., Christenson, R.K. 2001. Interrelationships among day 11 conceptus size, day 11 uterine protein secretion, day 105 fetal erythropoiesis and day 105 uterine capacity [abstract]. Proceedings Sixth International Conference on Pig Reproduction, Columbia, Missouri, p. 115. (Abstract No. 65)

Technical Abstract: The interrelationships among d 2 and 3 plasma progesterone, d 11 conceptus size and d 105 placental weight, placental efficiency, fetal erythropoiesis and uterine capacity were examined. In experiment 1, unilaterally hysterectomized-ovariectomized (UHO) gilts were mated and then slaughtered at d 105 of gestation and uterine capacity(UC), CL, placental weights (PW), fetal weights (FW), and fetal hematocrits (FHT), plasma iron (FPI) and folate (FPF) were measured. In experiment 2, UHO gilts were mated plasma progesterone (PP) was measured on d 2 and 3 of pregnancy. On d 11, the remaining uterine horn was flushed to recover conceptuses and uterine proteins. Uterine horn length (UL), CL, number and diameters (CD) of conceptuses, and intrauterine retinol binding protein (RBP), acid phosphatase (AP) and folate binding protein (FBP) were measured. Gilts were remated and then slaughtered at d 105 of pregnancy and the same traits as in experiment 1 were recorded. Day 2 and 3 PP concentrations were correlated with d 11 CD (r=.6; p<.01). RBP, AP and FBP were only correlated with d 3 PP (r=.47, .51, .49, respectively; p<.01). Day 11 CD and UL were not correlated with d 105 UC in the subsequent pregnancy. Day 105 UC was negatively correlated with PW, FW and FHT (r=-.37, -.45, -.35, respectively; p<.01). Placental efficiency (FW/PW) was not correlated with d 105 UC (r=.08). Fetal HT were correlated with FPI and FPF (r=.45, .52; p<.01). These data provide clues to successful strategies that may improve litter size in swine.

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