and dexamethasone) or 24 h later. Eleven and six first-calving heifers and sixteen and nine second- .... in connective tissue and crypts of the epithelium of the placentomes. (Arthur,. 1979;. Grunert, ...... WJ, Bryant-Greenwood. GD,. Greenwood.
BIOLOGY
OF
REPRODUCTION
37, 797-803
(1987)
Induction of Parturition, in Beef Heifers Given A. I. MUSAH,
Progesterone Relax in with
C. SCHWABE,
Secretion, and Delivery of Placenta Cloprostenol or Dexamethasone’
R. L. WILLHAM,
Department Iowa
and
L. L. ANDERSON2
of Animal Science State University
Ames,
Iowa 50011 and Department of Biochemistry Medical University of South Carolina Charleston,
South
Carolina
29425
ABSTRACT
parturition
Sixty
primiparous beef heifers from a crossbreeding with relaxin (3000 U/mg) combined with
mg,
n=30)
i.m.,
at
Day
273,
10
± 1 days
before
study cloprostenol
expected
were
used to examine (500 jig, i.m., n=30)
parturition
(Day
283).
Heifers
within cloprostenol and dexamethasone groups to receive relaxin (1 mg, n=5/treatment), os (OS), at 0 h (the same time as cloprostenol and dexamethasone) or 24 h later. heifers and sixteen and nine second-calving cows also received cloprostenol + relaxin phate-buffered
