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By Wolfgang Jöchle, Donald Ross Lamond (auth.)

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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. The estrous cycle is the sequence of estrous periods with regular intervals. A single cycle is composed of phases or stages, the nomenclature of which is shown in table 5.

Boar: a highly viscous sialoprotein, which causes gelantinization of the ejaculate. bult: secretion serves as urethral cleaner. : Fortpflanzung bei männlichen und weiblichen Haustieren, in: Handbuch der Tierernährung. Band 2, Leistung und Ernährung. W. Lenkeit, and K. Breirem, edit. p. 55-102. P. Parey, Berlin-Hamburg 1972. 25. Framework and background of mammalian sexual behaviour. , Handbook of Experimental PharmacoloQY, Val. XXII: Die Gestagene, Part 2, Chapter XIS, p. 680, Springer, Berlin 1969).

Klug and H. : TheriogenolOQY, 6, 403 412,197li. : J. Reprod. , 2, 182, 1962. Haines, E. , A. C. Warnick and H. D. Wallace: J. Anim. , 17,879,1958. : J. Agric. Sei. (Cambridge), 11,337,1921. Hasnain, H. : Proe. V. Int. Congr. An"". Reprod. & Artif. , Trento, Vol. 11. 342 -346,1964. eal"ly embryonic development seem to play an important role. By this mechanism, individuals with defective chromosomes are eliminated at an 2arly phase. Again in all species, subclinical uterine infecdons, nutritional deficiencies or unfavorable environmental conditions, especially high temperatures combined with high humidity, are known to drastically increase embryonic loss rates.

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