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Effects of ovulation status and stage of oestrous cycle on plasma progesterone concentrations in cattle with or without a history of twin calvings

Published online by Cambridge University Press:  02 September 2010

C. A. Morris ,
A. M. Day  and
A. J. Peterson
C. A. Morris
Affiliation:
Ministry of Agriculture and Fisheries, Ruakura Agricultural Research Centre, Private Bag, Hamilton, New Zealand
A. M. Day
Affiliation:
Ministry of Agriculture and Fisheries, Ruakura Agricultural Research Centre, Private Bag, Hamilton, New Zealand
A. J. Peterson
Affiliation:
Ministry of Agriculture and Fisheries, Ruakura Agricultural Research Centre, Private Bag, Hamilton, New Zealand
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Abstract

Plasma progesterone concentrations were measured over two collection periods from two groups of mature non-pregnant cows involved in a twin-breeding experiment. One group (T) consisted of cows obtained from private herds after having produced at least two sets of twins each; the other was a control group of similar ages and breeds. Yearling heifers from the same breeding experiment were also included. The mean progesterone concentration from cows in the T group was proportionally 0·83 of the value in control cows and the cow group effects were consistent in direction for samples obtained after single or double ovulations. Results were also consistent in early oestrous cycle (days 3 to 7, oestrus = day 0), mid cycle (days 8 to 13) but not late cycle (days 14 to 18). Concentrations were significantly higher in yearling heifers than in control cows. There was a trend for higher progesterone concentrations after double than after single ovulations assessed by rectal palpation, but differences were not significant.

Type
Papers
Information
Animal Production , Volume 45 , Issue 2 , October 1987 , pp. 205 - 209
Copyright
Copyright © British Society of Animal Science 1987

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References

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