Vle CONG. INTERN. REPROD. ANIM. INSEM. ARTIF., PARIS, 1968, VOL. I

SUMMARY. In preliminary studies using a technique
previously described for the display of chromo-
somes from blastocysts of the pig, chromosomes
were examined from 12 blastocysts obtained from 11
heifers between 12 and 16 days of gestation. The
presence of tetraploid cells in one of the blasto-
cysts suggests that chromosome abnormalities may
contribute to early embryonic death in the bovine.

(1) D. H. CARR, 1965. Obstet. and Gynecol. 26:
308-326.

(2) ReK: MEFEEEY . 1967 ). Rapyrod: - Farts 13;
579-581.

(3) E: L. SHAVER and. D.- H<:CARR, 1967.:J. Reprod.
Fert., 14: 415-420.

(4) R.-A. McFEELY, 3966: J. Reprod. Fert., 1l:
161-163.

(5) 0.BOMSEL-HELMREICH, 1961. Proc. IV Int Cong.
Anim. ‘Reprod., SI1I: 578=581

 

 

TABLE
Days Modal Sex
Heifer Post Chromo- Chromo- Remarks
No. Breeding some No. somes
1 15 60 XX
2 i 60 XX
3 13 60 XY
4 14 60 XX
5 16 A 60 A XX Twins
B 60 B XY
6 14 60 XX
7 16 60/120 XX/XXXX Diploid/ = 1]/
Tetraploid 7
8 14 60 XY
9 13 60 XX
10 14 60 XY
11 12 60 XX

This project was sponsored with funds received
from the Pennsylvania Fair Fund administered by the
Pennsylvania Department of Agriculture and by USPHS
Grant FR0O0120.

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