Yazar "Wehrend, A." seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • Küçük Resim Yok
    Öğe
    Follow-up Ultrasonographic Examinations in Pregnant Bitches - Evaluation of Frequency and Significance of Embryo Resorption
    (Schattauer Gmbh-Verlag Medizin Naturwissenschaften, 2010) Şendağ, S.; Dinç, D. A.; Çelik, H. A.; Aydın, I.; Wehrend, A.
    Objective: Follow-up ultrasonographic examinations in pregnant bitches to evaluate frequency and significance of embryo resorption. Material and methods: In 39 Kangal bitches the number of gestational sacs was measured and vitality of embryos/fetuses was evaluated by real time ultrasonography daily from the 15th till the last day of gestation. Results: Five bitches (12.8%) showed embryonic resorption and one of these bitches exhibited a complete resorption. Fetal death could be observed in four females and was related to a total loss of the litter. After the first evidence of embryonic death gestational sacs remained detectable for 8.6+/-0.5 days. The number of embryos of bitches with (10.8+/-1.8) or without embryo resorption (8.2+/-2.1) was statistically significantly different (p<0.05). On the other hand there was no statistically significant difference within the number of embryos of bitches suffering fetal death and bitches without embryo resorption (8.2+/-2.1) (p>0.05).A relationship between litter size and gestational length could not be verified (r = 0.15; p>0.05). Conclusion and clinical relevance: Due to these results the hypothesis is postulated that embryonic resorption is a kind of protective mechanism of the maternal organism against too large litter sizes.
  • Küçük Resim Yok
    Öğe
    Ultrasonic determination of fetal sex in ewes under field conditions by a single investigation
    (SCHATTAUER GMBH-VERLAG MEDIZIN NATURWISSENSCHAFTEN, 2007) Sendag, S.; Celik, H. A.; Aydin, I.; Dinc, D. A.; Wehrend, A.; Guerkan, M.
    Objective: Ultrasonic determination of fetal sex in ewes under field conditions by a single examination. Material and methods: Accuracy of transrectal and transabdominal ultrasonographic determination of fetal sex was examined in 210 ewes with singletons or twins between the 40th to 90th day post mating. Examinations were conducted under field conditions by ultrasonography with a linear-array 5 MHz transducer. Day 1 was the first day after mating. Single transrectal and transabdominal ultrasound examinations were performed in standing position of the sheep. Fetal sex determination was performed on days 40 to 49 (group I), days 50 to 59 (group II), days 60 to 69 (group III), days 70 to 79 (group IV) and days 80 to 90 (group V). Definite diagnoses were made after lambing. Results: The accuracy was 0% in group I (0/42), 40.0% in group II (13/42),33.3% in group III (14/42),64.2% in group IV (27/42) and 47.6% in group V(20/42). The differences between groups IV and V to groups I to III were significant(p < 0.05). The accuracy of fetal sex diagnosis was also influenced by singletons or twins (p < 0.05). Conclusion and clinical relevance:The results show that a single ultrasonographic examination is nota proper method for determination of fetal sex in sheep underfield conditions.