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Kontaktaufnahme zwischen Trophoblast und Uterusepithel wa̋hrend der frűhen Implantation beim
THERIOGENOLOGY
ABSTRACTS
BOVINE Leiser, R.: Rontaktaufnahme zwischen Trophoblast und Uterusepithel wzhrend der f&hen Implantation beim Rind. Zbl. Vet. Med., Reihe C, 4:63-86. Institut f& Tieranatomie der &Tversi&t Bern, P.O. 2735, CH-3001, Bern, Switzerland. This paper reports about macroscopic, microscopic and electron-microscopic studies of the processes surrounding implantation (nidation) in the bovine, from dav 21 to 38 of-gestation. Three phases of implantation can be- recognized, the precontact, the apposition and the adhesion phase; all three of them are easily distinguished macroscopically as early as on days 18 or 19 post insemination, and are microscopically best seen on day 22, when they exist simultaneously: in the middle segment of the pregnant uterine horn, in the central embryonic region, adhesion is taking place; apposition is the status in the uterine fundus and throughout most of both horns, with the exception of their tips where the precontact phase can be observed. The precontact stadium is defined by the end of the trophoblast's elongation, but no contact with the endometrium is yet established; in the apposition phase, contact is made as to prevent further trophoblast movements. The surfaces of the opposing trophoblastic and endometrial cells enlarge and unite by interdigitation of their microvilli. In the adhesion phase, this process in concluded and implantation achieved. These procedures are initiated in the intracaruncular spaces: only from day 30 on, after placentomas are formed, implantation spreads to and includes cotelydones. In the paper, aspects of the functional relationships between uterus, blastocyst and embryo during the various phases are discussed. W. Jochle Enriquez-Yap, E. L.: The placentome of the Philippine carabao (Rubalus-bubalis) in mid-pregnancy: a study to establish the basis of clinico-pathological analysis on the possible causes of early reproductive failures. Philipp. J. Med. Vet., 13:1-25, 1974. Department of Veterinary Anatomy, Zllege of Veterinary Medicine, University of the Philippines, Diliman, Quezon City, Philippines. A prerequisite for the understanding of infertility due to embryonic losses during or after implantation is knowledge and information on the physiological and morphological conditions accompanying these processes in sound animals. In the water buffalo, these information are lack-
AUGUST-SEPTEMBER
1975
VOL. 4 NO. 2-3
89
ABSTRACTS
BOVINE Leiser, R.: Rontaktaufnahme zwischen Trophoblast und Uterusepithel wzhrend der f&hen Implantation beim Rind. Zbl. Vet. Med., Reihe C, 4:63-86. Institut f& Tieranatomie der &Tversi&t Bern, P.O. 2735, CH-3001, Bern, Switzerland. This paper reports about macroscopic, microscopic and electron-microscopic studies of the processes surrounding implantation (nidation) in the bovine, from dav 21 to 38 of-gestation. Three phases of implantation can be- recognized, the precontact, the apposition and the adhesion phase; all three of them are easily distinguished macroscopically as early as on days 18 or 19 post insemination, and are microscopically best seen on day 22, when they exist simultaneously: in the middle segment of the pregnant uterine horn, in the central embryonic region, adhesion is taking place; apposition is the status in the uterine fundus and throughout most of both horns, with the exception of their tips where the precontact phase can be observed. The precontact stadium is defined by the end of the trophoblast's elongation, but no contact with the endometrium is yet established; in the apposition phase, contact is made as to prevent further trophoblast movements. The surfaces of the opposing trophoblastic and endometrial cells enlarge and unite by interdigitation of their microvilli. In the adhesion phase, this process in concluded and implantation achieved. These procedures are initiated in the intracaruncular spaces: only from day 30 on, after placentomas are formed, implantation spreads to and includes cotelydones. In the paper, aspects of the functional relationships between uterus, blastocyst and embryo during the various phases are discussed. W. Jochle Enriquez-Yap, E. L.: The placentome of the Philippine carabao (Rubalus-bubalis) in mid-pregnancy: a study to establish the basis of clinico-pathological analysis on the possible causes of early reproductive failures. Philipp. J. Med. Vet., 13:1-25, 1974. Department of Veterinary Anatomy, Zllege of Veterinary Medicine, University of the Philippines, Diliman, Quezon City, Philippines. A prerequisite for the understanding of infertility due to embryonic losses during or after implantation is knowledge and information on the physiological and morphological conditions accompanying these processes in sound animals. In the water buffalo, these information are lack-
AUGUST-SEPTEMBER
1975
VOL. 4 NO. 2-3
89