Description

• Title:
  THE SCALE AND REASONS FOR RESIGNATION FROM EMBRYO COLLECTION IN DONOR HEIFERS AND CULLED COWS
• Creator:
  Grzeczka, Arkadiusz;
  Tul, Oleksandra
• Description:
  In the practice of embryo transfer in cows, it happens that in a certain percentage of donors,for various reasons, the embryo collection procedure is abandoned. Commercial ET teamsrarely report the scale and reasons for this. This phenomenon is not better known in culledcows, which are quite often used as exercise material for students to learn the flushingtechnique of donor cows. The aim of the study was to present the scale and reasons forresignation from embryo collection in commercially used donor heifers and cows, includingcows culled from reproductive reasons. The study summarizes the data collected over thelast four years in 205 donor cows subjected to the standard superovulation (SOV) procedure.Of the commercialy females subjected to superovulation – 167 were 14-16 month-old heifers,the remaining 38 were cows, including 11 culled females. All animals had not been previouslyassessed for suitability for ET. The FSH preparation Pluset (Carlier) was used to inducesuperovulation. Some donors received progesterone support (PRID-Delta (CEVA AnimalHealth) during FSH administration. To heat induction 500 μg cloprostenol was used. Femaleswere flushed on day 7 after estrus. Rüsch catheter (Neustadt Aisch model) was used forembryo collection. One day before embryo collection 114 donor cows received i.m. injectionof 500 μm cloprostenol (Estrumate). Of the heifers, 24 females (14.4%) were not flushed. Themain reasons for resignation from embryo collection were: insufficient reaction to FSH – 13(7.8%), difficulties in introducing the catheter into the uterus – 9 females (5.4%), insufficientsynchronization of the estrus cycle (prolonged estrus, numerous follicles present on the ovary– one heifer [(0.5%]) and edema of the rectal mucosa (effect of long-term manipulation) –one heifer (0.5%). Out of 38 cows, 10 females (26.3 %%) were not flushed. Of the 27commercially flushed cows, 5 had an insufficient response to hormones (18.5%), and one(3.7%) had inappropriate estrus timing. The situation among fattening cows was moredramatic. In this group, 4 cows (36.3%) were not flushed. Two (18.2%) did not react to FSH.Of the donors who received cloprostenol prior to embryo collection, 6 (4.2%) females haddifficulties with cervical penetration. In summary; about 1/6 of heifers and 1/4 of cows did notwash the embryos for various reasons. For similar reasons, 1/3 of the cull cows were notrinsed. In the case of this group of donors, prior selection is necessary.
• Object availability:
  free access
• Rights: https://creativecommons.org/licenses/by-nd/4.0 ;
  Prawa autorskie (c) 2023 Grzeczka A, Tul O
• Date:
  2023.07.09
• Type:
  info:eu-repo/semantics/article;
  info:eu-repo/semantics/publishedVersion
• Language:
  English
• Source:
  Translational Research in Veterinary Science; Vol. 6 No. 1 (2023); 12;
  Translational Research In Veterinary Science; Tom 6 Nr 1 (2023); 12;
  2657-4489
• Format:
  application/pdf
• Publisher:
  Nicolaus Copernicus University in Toruń
• Relation: https://apcz.umk.pl/TRVS/article/view/63541/43187
• Subject:
  embryo transfer;
  lack of success;
  donors
• Identifier: https://apcz.umk.pl/TRVS/article/view/63541
• Data provider:
  Akademicka Platforma Czasopism
• Can I use it?:
  seek permission
• Type:
  text