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By Wolfgang Jöchle, Donald Ross Lamond (auth.)

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Andersen: Theriogenology, 7, 113, 1977. Legend: 01 = diestrus; PRO = proestrus; ESTR. = estrus; MET = metestrus; AN = anestrus. E = estrogens; P = progesterone; C. I. = corpora lutea. ovulation and the sequels of it (see below). At -his point desensitization of the hypothalamicIpituitary system and its adjustment at mature evels is achieved. g. sheep, goat, horse, cat, and camels. g. g. ) A few species show heat only once annually, and are called monestrous accordingly (fox; mink). The dog, commonly called monestrous, actually has a cycle length of 7 (5 to 10) months and defies therefore a precise definition.

In the bovine) are recorded. These follicles become atretic, since lack of final stimulation results in losses of receptors tor FSH, LH and E,. If a conception was missed or a conceptus lost early, the endometrium, under the influence of such follicular activity and the resulting E, levels, and without being inhibited by a growing trophoblast, forms either arachidonic acid (AA) or PGF,,,. 1. regression. Luteal degeneration is accompanied by a steep decline in P levels. This process of luteolysis eliminates the barriers for the resumption of the subsequent follicu/ar phase.

Reprod. , Suppl. 23, 419-424, 1975 (PMSG, progesterone). Allen, W. : J. Reprod. Fert. Suppl. 23, 405-413, 1975 (PMSG in normal and mule bearing mares). 46 C N 5 Nervous influences on the hypothalamus physical psychic rnetabolism environ - factors - and other ment bysenso- -mental endogenous rical transmis - status factors r sion l (1) '04 ... --- VL N (2) Hypothalamus , 7 ~ (1) Prod uction and release of " @(2)@(2)@ FSH 11 ~- J Follicular (1)nooo growth (2) starts ----- tonicLH ovulatory LH J Morphological + - ------ response , (1) • Hormoral (2) • , 1) response - (2) (1) (1) EpitheL Separation ------ - ---Tu bes- ---- --Muscles Placenta Estrogens: ...

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