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J. A. MARUNIAK, CLAUDE DESJARDINS and F. H. BRONSON

Summary.

Urine marking was examined in house mice, deermice, gerbils and hamsters. The frequency of urine deposition varied with the species, and a correlation is suggested between the propensity of males to mark in this fashion and prepuce length and morphology. We postulate an adaptational advantage for a long penis sheath and for a particular configuration of the prepuce; i.e. to act as a wick for the deposition of urinary pheromones.

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V. M. CHAPMAN, CLAUDE DESJARDINS and W. K. WHITTEN

Summary.

A significant decrease in pituitary lh accompanied by an increase in blood plasma progestins was observed in pregnant females 24 hr after exposure to alien males (Day 2 post-mating). Conversely, no change in pituitary lth was detectable until 48 hr after females were caged with alien males. These data suggest the lh release may play an important rôle in pregnancy block.

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CLAUDE DESJARDINS, K. T. KIRTON and H. D. HAFS

Summary.

Bovine follicular fluid was compared with blood serum or blood plasma with respect to the concentration of protein and free amino nitrogen, the number of antigens and the number and mobilities of electrophoretic components. The protein concentration of follicular fluid (7·08 g/100 ml) was less than that of blood serum (9·10 g/100 ml), but no significant difference existed between the values of free amino nitrogen in the two fluids (4·31 and 3·97 mg/100 ml, respectively).

Rabbit antisera to follicular fluid, blood serum or blood plasma gave several precipitin lines (at least 7, 7 and 8 respectively) when reacted with their homologous antigens in agar–gel-diffusion studies. After absorption with blood serum, there was one antigen (presumably fibrinogen) in blood plasma and follicular fluid that was not found in blood serum. These results were substantiated by immuno-electrophoresis.

Moving boundary electrophoresis in five different buffers revealed at least eight components in follicular fluid and blood serum and at least nine in blood plasma. Minor differences were observed in the electrophoretic mobilities of some components found in both follicular fluid and blood serum.

The results showed that the major macromolecular components of follicular fluid and of blood were similar, but that some minor macromolecular ones may differ.