tailieunhanh - Báo cáo khoa học: "Fixed-time artificial insemination in beef cattle"

Tuyển tập các báo cáo nghiên cứu về bệnh học thý y được đăng trên tạp chí Acta Veterinaria Scandinavica cung cấp cho các bạn kiến thức về bệnh thú y đề tài: Fixed-time artificial insemination in beef cattle. | Acta Veterinaria Scandinavica BioMed Central Research Fixed-time artificial insemination in beef cattle Juhani Taponen Open Access Address Department of Clinical Veterinary Sciences Faculty of Veterinary Medicine University of Helsinki Paroninkuja 20 04920 Saarentaus Finland Email Juhani Taponen - Published 30 November 2009 Received 19 August 2009 J J. 1 I mz 1-rri 1 z-r ri Accepted 30 November 2009 Acta Veterinaria Scandinavica 2009 51 48 doi 86 1751-0147-51 -48 This article is available from http content 51 1M8 2009 Taponen licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License http licenses by which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. Abstract__ Background The study was designed to test the effect of fixed-time artificial insemination fixed-AI after the slightly modified Ovsynch protocol on the pregnancy rate in beef cattle in Finnish field conditions. The modification was aimed to optimize the number of offsprings per AI dose. Methods Ninety Charolais cows and heifers were entered into the program an average of times. Thus 164 animal cases were included. Animals were administered 10-12 pg of buserelin. Seven days later animals without a corpus luteum CL were rejected while the remaining 130 cases with a CL were administered prostaglandin F2a followed 48 h later with a second injection of buserelin 8-10 pg . Fixed-AI was performed 16-20 hours after the last injection. Results The pregnancy rate was 67 130 . The pregnancy rate after a short interval 50-70 d from calving to entering the program was significantly higher than that after a long interval 70 d . Conclusion This protocol seems to give acceptable pregnancy results in beef herds and