Control of Reproductive Functions in Domestic Animals by Wolfgang Jöchle, Donald Ross Lamond (auth.)

By Wolfgang Jöchle, Donald Ross Lamond (auth.)

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By Wolfgang Jöchle, Donald Ross Lamond (auth.)

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5. 31 Table 5. , 01 PRO ESTR. 2 01 PRO ESTR. 3 01 PRO ESTR. 4 AN PRO ESTR. MET -<- 01 5 AN PRO ESTR. to (1) and (2): Presently most widely of rising P levels. to (3): In this terminology, metestrus 10 (4): Terminology proposed forthe 10 (5): Terminology proposed for the C. I. formation Full c. I. P levels are functions: rising P peak levels 01 MET --E----------- -(------------- -+-~-- C. I. - PRO -+ PRO ~ PRO 01 +---- AN >- AN --+ PRO PRO used terminologies for large animals (and the cat). Metestrus is characterized here by the phase is identified as the period dominated by P (its rise, peak levels and decline).

In the equine, P levels reflect the peculiar mechanisms involved in the first two trimesters of gestation for P production. Waves of follicles are formed under the continuing 10-day-rhythm of FSH discharge. l. Between day 160 and 200 of gestation, all corpora lutea regress (fig. 22). P production is maintained at comparatively high levels for the duration of the PMSG surge. PMSG reaches peak levels around days 90 to 120, but disappears soon thereafter. Interestingly, in mares carrying mules, PMSG is produced in considerably smaller amounts and with a differing FSH: LH ratio, but without adverse effects on gestation (see fig.

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). Table 8 (A). Reproductive Data for Domestic Animals: Working averages (or ranges) are given, breeds and individuals may show Male CaUle Seef Age at puberty (months) 12-18 Usual age at first service (months) 18-24 Cohabitation: Male reactian time Approximate duration of intromissions 20 sec.

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