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Vlcek Z.: LatePuerperium and the New Reproductive Cycle in Cows with Regard to Restoration of their Ovarial Activity, Estrus and the First Postpartal Ovulation. Acta vet. Brno, 51, 1982: 75-80. The time sequence of uterine involution, regression of the corpus luteum gravidi­ tatis, restoration of the ovarial activity and symptoms of estrus and the first postpartal ovulation were followed in 282 Bohemian Pied cows. The involution of the reproductive organs inspected by external, vaginal and rectal examination followed the usual pattern. More pregnancies were placed in the right uterine horn. A pea-sized regressive corpus luteum graviditatis was found in a portion of examined cows on days 12-14 post partum, later no more corpora lutea were exactly identifiable. In several cows as soon as on days 15 -17 post partum, in majority of animals on days 18-20, growth of follicles was observed. The majority of cows showed signs of the jollicular phase of the reproductive cycle in the fourth week after parturition and some animals were in metestrus or die­ strus. Morphological changes in the first cycle were more frequently observed on the left ovary and on the side of the previously non-pregnant uterine horn. Involution, uterus, ovary, vaginal mucosa, secretions. Great attention has been paid to physiology of puerperium in cows as well as to etiology, diag­ nosis and prevention of pathological conditions complicating the course of puerperium and im­ pairing future fertility. The present study reports on results of a complex examination of puerpe­ ral cows obtained under large-scale farm conditions. The aim of the research project is to suc­ cessfully monitor the reproductive process in cattle. New data have been added to the knowledge of the course of puerperium in cows, including information about mechanisms of puerperal involution of reproductive organs, regression of the corpus luteum graviditatis, restoration of the reproductive cycle after parturition (Wagner et a!. 1969; Wagner and Hansel 1969; Kudl:ic and Vlcek 1975; Kudl:ic 1975; LaktU; 1979). The course of involutional process was studied in detail by Gier and Marion (1968), factors affect­ ing the regression of c. luteum by Marion et a1. (1968), the bacterial content of the uterus by Lloyd et a1. (1968). Regression of corpus luteum graviditatis was investigated also by Wohanka (1961) and others. Uterine involution and follicular activity of the ovaries in puerperium with re­ gard to fertility disorders was studied by Bostedt et a1. (1976), Arbeiter (1976), Buchholz and Busch (1977), Rtisse (1968). Relationships between the course of puerperium and readiness for a new conception was followed by Bach (1974). The relationship between the course of puer­ perium, milk yield, lactation curve and conception rate was investigated by Buchholz and J e­ richow (1977). The aim of these and many other papers was to optimalize and shorten the course of puerperium and to ensure a high conception rate in cows through an active control of puerperium and, if necessary, by means of therapy.

Late Puerperium and the New Reproductive Cycle in Cows with Regard to Restoration of their Ovarial Activity, Estrus and the First Postpartal Ovulation