אסיף מאגר המחקר החקלאי

Androstenedione, dehydroepiandrosterone and testosterone in ovarian vein plasma and androstenedione in peripheral arterial plasma during the bovine oestrous cycle

Year:

1982

Source of publication :

Authors :

Volume :

66

Co-Authors:

Wise, T.H., Dep. Anim. Sci., Univ. Florida, Gainesville, FL 32611, United States
Caton, D., Dep. Anim. Sci., Univ. Florida, Gainesville, FL 32611, United States
Thatcher, W.W., Dep. Anim. Sci., Univ. Florida, Gainesville, FL 32611, United States
Lehrer, A.R.
Fields, M.J.

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Abstract:

Catheters were placed in the carotid artery via a facial artery (n = 12) and in the ovarian (n = 12), and, in conjunction, electromagnetic flow meters were placed around the ovarian artery (n = 6) in cyclic beef cows. Androstenedione was quantitatively the highest and dehydroepiandrosterone the lowest of the ovarian androgens measured. Ovarian androgens were correlated with each other (P<0.01) but not with ovarian blood flow or day of the cycle. There was a trend for spikes of androgens release (ovarian vein concentration x ovarian blood flow) from the ovary to be greatest during the period of decreasing progesterone and CL regression. However, only with testosterone were spikes of release different (Days -13 to -9 < Days -8 to -4; P < 0.05; Day 0 = oestrus). The dynamic changes in ovarian androgens noted in this study were compatible with the concept of continuous follicular development and atresia throughout the oestrous cycle.

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