scholarly journals Comparison of Two Types of CIDR-based Timed Artificial Insemination Protocols for Repeat Breeder Dairy Cows

2007 ◽  
Vol 53 (3) ◽  
pp. 639-645 ◽  
Author(s):  
Ui-Hyung KIM ◽  
Guk-Hyun SUH ◽  
Tai-Young HUR ◽  
Seog-Jin KANG ◽  
Hyun-Gu KANG ◽  
...  
Keyword(s):  
Dairy Cows ◽  
Artificial Insemination ◽  
Timed Artificial Insemination ◽  
Repeat Breeder

scholarly journals The ovulatory response to human chorionic gonadotropin administration on day 4 post timed artificial insemination improved fertility in repeat breeder cows

2021 ◽  
Vol 90 (1) ◽  
pp. 15-20
Author(s):  
Gulnaz Yilmazbas-Mecitoglu ◽  
Ahmet Gumen ◽  
Ebru Karakaya-Bilen ◽  
Abdulkadir Keskin ◽  
Baris Guner ◽  
...  
Keyword(s):  
Beneficial Effect ◽  
Dairy Cows ◽  
Corpus Luteum ◽  
Chorionic Gonadotropin ◽  
Human Chorionic Gonadotropin ◽  
Artificial Insemination ◽  
Pregnancy Rates ◽  
Control Group ◽  
Timed Artificial Insemination ◽  
Repeat Breeder

This study focused on determining the success of inducing endogenous progesterone source (by formation of accessory corpus luteum) by human chorionic gonadotropin (hCG) administration on day 4 post timed artificial insemination (TAI) and on evaluating the effect of the day of hCG administration (day 4 or 5 post TAI) on pregnancy rates in repeat breeder cows according to their responses to hCG administrations. Non-pregnant cyclic lactating Holstein dairy cows with more than three services despite no clinical reproductive abnormalities were enrolled in the study. All cows (n = 192) received the Ovsynch protocol (GnRH-7d-PGF2α-56h-GnRH-16/18h-TAI) and hCG administration (1500 IU, i.m.) was performed in group hCG4 (n = 64) on day 4 and in group hCG5 (n = 68) on day 5 post TAI. The control group (CON, n = 60) did not receive any hCG treatment. The responses (ovulation rate) to hCG (~64%) were similar on days 4 and 5 post TAI. Pregnancy per AI (P/AI) at 31 days was similar among the groups (48.3% in CON, 48.4% in hCG4, and 42.6% in hCG5). Regardless of the day of the treatment (hCG4 + hCG5), the cows had an ovulatory response to hCG (54.1%), and a greater P/AI (P = 0.007) at 31 days than those without a response (29.8%). The administration of hCG on either day 4 or 5 post TAI did not increase overall pregnancy rates, however, the ovulatory response to the post TAI hCG administration on day 4 improved fertility in repeat breeder cows. Further studies are needed with a larger number of animals to reveal this potentiallly beneficial effect.

LRH‐A3 and HCG increase pregnancy rate during timed artificial insemination in dairy cows

2021 ◽  
Vol 92 (1) ◽  
Author(s):  
Peng Zheng ◽  
He Huang ◽  
Xiaoyu Li ◽  
Fushuo Huang ◽  
Samson Olugbenga Adeniran ◽  
...  
Keyword(s):  
Dairy Cows ◽  
Pregnancy Rate ◽  
Artificial Insemination ◽  
Timed Artificial Insemination

scholarly journals Endometrial Inflammation at the Time of Insemination and Its Effect on Subsequent Fertility of Dairy Cows

Animals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1858
Author(s):  
Karen Wagener ◽  
Marc Drillich ◽  
Christine Aurich ◽  
Christoph Gabler
Keyword(s):  
Immune Response ◽  
Dairy Cows ◽  
Mrna Expression ◽  
Reverse Transcription ◽  
Artificial Insemination ◽  
Cox Regression ◽  
Related Factor ◽  
Subsequent Fertility ◽  
Cxcl8 Mrna ◽  
Repeat Breeder

Our objective was to investigate the level of endometrial immune response at artificial insemination (AI) and to relate it to subsequent fertility. From 71 healthy cows, endometrial cytobrush samples were taken at the first AI for cytological and mRNA analyses. Total RNA isolated from the cytobrushes was used for reverse transcription qPCR for selected transcripts. Animals were grouped into pregnant (PREG; n = 32) and non-pregnant (non-PREG; n = 39) cows following their first AI. The mRNA abundance of the neutrophil-related factor CEACAM1 and the chemokine CXCL5 was 1.2- (p = 0.03) and 2.0-fold (p = 0.04) greater in PREG than in non-PREG cows, respectively. Animals were further subdivided according to the number of inseminations until pregnancy (PREG1, n = 32; PREG2-3, n = 19) and in repeat breeder cows (RBC, n = 13). CEACAM1 and CXCL8 mRNA expression was 1.7- (p = 0.01) and 2.3-fold (p = 0.03) greater in PREG1 than in RBC, respectively. Cox regression showed that cows with PMN ≥ 1% had a 1.8-fold increased chance of pregnancy within 150 days postpartum compared with cows with fewer PMNs. We conclude that a certain level of inflammation before the stimulus of AI might be beneficial for subsequent fertility.

scholarly journals Use of on-farm milk progesterone information to predict fertility outcomes in dairy cows subjected to timed artificial insemination

2020 ◽  
Vol 103 (7) ◽  
pp. 6600-6611
Author(s):  
B.O. Omontese ◽  
G.C. Gomes ◽  
A.R. Santos ◽  
L.G. Silva ◽  
V.R. Merenda ◽  
...  
Keyword(s):  
Dairy Cows ◽  
Artificial Insemination ◽  
Timed Artificial Insemination ◽  
On Farm

Use of sex-sorted sperm in lactating dairy cows upon estrus detection or following timed artificial insemination

2013 ◽  
Vol 143 (1-4) ◽  
pp. 19-23 ◽  
Author(s):  
M.F. Sá Filho ◽  
M.F. Mendanha ◽  
R.V. Sala ◽  
F.J. Carvalho ◽  
L.H.C. Guimarães ◽  
...  
Keyword(s):  
Dairy Cows ◽  
Artificial Insemination ◽  
Lactating Dairy Cows ◽  
Estrus Detection ◽  
Timed Artificial Insemination

scholarly journals Timed artificial insemination programs during the summer in lactating dairy cows: Comparison of the 5-d Cosynch protocol with an estrogen/progesterone-based protocol

2013 ◽  
Vol 96 (11) ◽  
pp. 6904-6914 ◽  
Author(s):  
M.H.C. Pereira ◽  
A.D.P. Rodrigues ◽  
T. Martins ◽  
W.V.C. Oliveira ◽  
P.S.A. Silveira ◽  
...  
Keyword(s):  
Dairy Cows ◽  
Artificial Insemination ◽  
Lactating Dairy Cows ◽  
Timed Artificial Insemination
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