Abstract:
The history, growth and present development of the
Thoroughbred industry of South Africa are described. The reasons for
the establishment of Thoroughbred studs in the Karroo Midlands are
discussed.
A study is made of various psychological, physiological
and ecological factors in relation to breeding results. The data on
oestrus, ovulation, pregnancy and related phenomena were obtained at
the Askania Nova Stud, Middelburg, Cape, between 9th September, 1952
and 7th March, 1953, and are the results of observations combined with
consistent rectal and vaginal examinations carried out on 27 Thoroughbred
mares.
Management of the stud is described and data are presented
recording observations on the oestrous cycle and its hormonal control,
with details on the application of various endocrine substance, treatments
and surgical interventions in the correction of irregularities
of the cycle, The hormonal control of the oestrous cycle is reveiwed
and another theory proposed.
Information is also presented on some aspects of pregnancy,
including the occurrence of foetal migration and foetal death. These
findings are discussed.
