USE OF MILK
PROGESTERONE ASSAY FOR MONITORING OESTRUS AND EARLY PREGNANCY IN NILI-RAVI
BUFFALOES
H.A. Samad, Nazir
Ahmad, Bengmen, N.U. Rehman and Ijaz Ahmad
Department of
Animal Reproduction, University of Agriculture, Faisalabad, Pakistan
Abstract
In this study, the use of milk
progesterone assay for oestrus detection and early pregnancy diagnosis in Nili-Ravi
buffaloes was investigated. For this purpose, 100 milking buffaloes with
clinically normal reproductive tract were used. Oestrus was detected on the
basis of visual signs and uterine changes observed through rectal palpation.
These buffaloes were then inseminated on day of oestrus. Three milk samples were
taken from each buffalo, one each on day of insemination and then on 10-12 and
21-22 days post insemination. These animals were rectally examined for pregnancy
60 days after insemination. The milk samples were analyzed for progesterone
concentrations through RIA. Out of 100 buffaloes observed to be in
oestrus on the basis of visual signs and
rectal examination, 94% showed the milk progesterone concentrations ranging from
0.01 to 0.90 ng/ml, whereas in only 6%
animals, milk progesterone concentrations ranged from 3.31 to 7.44 ng/ml. Thus, 6% buffaloes seemed to have been
inseminated during luteal phase. On day
21-22, out of 84 buffaloes examined, 50(59.52%) showed the milk progesterone
concentrations >2.0 ng/ml and were assumed
to be pregnant. However, when 41 out of these 50 animals were rectally examined
60 days post insemination, 36(87.81%) were found pregnant. Perhaps there was
early embryonic death in the remaining 5(12.19%) buffaloes. It was concluded
that milk progesterone assay may be used to evaluate the accuracy of clinically
diagnosed oestrus, as well as for early
pregnancy diagnosis in Nili-Ravi
buffaloes.
Key words: Milk progesterone, oestrus, early pregnancy, buffaloes.