Timed Artificial Insemination by Combining Estrous Behavior Observation With Deslorelin Treatment in Jennies

2020 ◽  
Vol 95 ◽  
pp. 103279
Author(s):  
Qing Liu ◽  
Daiyong Cui ◽  
Guanglei Cong ◽  
Jinliang Ma ◽  
Jie Yu ◽  
...  
Keyword(s):  
Artificial Insemination ◽  
Behavior Observation ◽  
Timed Artificial Insemination ◽  
Estrous Behavior

scholarly journals Artificial insemination system without estrous observation in suckled beef cows

2008 ◽  
Vol 39 (2) ◽  
pp. 496-501 ◽  
Author(s):  
Luiz Felipe Kruel Borges ◽  
Rogério Ferreira ◽  
Lucas Carvalho Siqueira ◽  
Rodrigo Camponogara Bohrer ◽  
Jacson William Borstmann ◽  
...  
Keyword(s):  
Artificial Insemination ◽  
Transrectal Ultrasound ◽  
Beef Cows ◽  
Estradiol Benzoate ◽  
Pregnancy Rates ◽  
Timed Artificial Insemination ◽  
Average Size ◽  
Vaginal Device ◽  
Estrous Behavior ◽  
Follicular Dynamics

The aim was to develop a timed artificial insemination (TAI) system in suckled beef cows. Cows (n=227), 60-80 days postpartum, received estradiol benzoate (5mg) and a vaginal device containing 250µg of medroxyprogesterone acetate (MPA; day 0). On day six, cloprostenol (125µg) and eCG (400IU) were administrated and calves were weaned for 88h. The devices were removed on day seven (BioRep group) or on day eight (TAI group). All cows of TAI group and cows of BioRep group that did not exhibit standing estrus received GnRH (100µg) on day 9. In experiment I, the follicular growth was monitored daily by transrectal ultrasound exams, from day 6 to day 9. The average size of the dominant follicle on day nine was 11.1±0.99mm (BioRep, n=7) and 11.5±0.65mm (TAI, n=7) and all animals ovulated. In experiment II, the BioRep group cows (n=106) were observed for estrous behavior after withdrawal of the device, twice a day for 48h, and inseminated 12h after detection. In the TAI group (n=107), the devices were withdrawn on day eight and after 24h these cows and those from the BioRep group, which were not stand in estrus, received 100µg of GnRH and TAI 16h later. The pregnancy rates were 57.6% (BioRep) and 52.3% (TAI). In conclusion, an increase on MPA exposure time did not affect the follicular dynamics and pregnancy rates and allow TAI without estrous observation. Furthermore, the treatment for eight days provides an efficient TAI system in suckled beef cows.

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 Hormonal manipulations in the 5-day timed artificial insemination protocol to optimize estrous cycle synchrony and fertility in dairy heifers

2013 ◽  
Vol 96 (11) ◽  
pp. 7054-7065 ◽  
Author(s):  
F.S. Lima ◽  
E.S. Ribeiro ◽  
R.S. Bisinotto ◽  
L.F. Greco ◽  
N. Martinez ◽  
...  
Keyword(s):  
Estrous Cycle ◽  
Artificial Insemination ◽  
Dairy Heifers ◽  
Timed Artificial Insemination

Alternatives to improve a prostaglandin-based protocol for timed artificial insemination in sheep

2011 ◽  
Vol 76 (8) ◽  
pp. 1501-1507 ◽  
Author(s):  
J. Olivera-Muzante ◽  
J. Gil ◽  
S. Fierro ◽  
A. Menchaca ◽  
E. Rubianes
Keyword(s):  
Artificial Insemination ◽  
Timed Artificial Insemination

Efficiency of mating, artificial insemination or resynchronisation at different times after first timed artificial insemination in postpartum Nellore cows to produce crossbred calves

2019 ◽  
Vol 59 (2) ◽  
pp. 225 ◽  
Author(s):  
Walvonvitis Baes Rodrigues ◽  
Jean do Prado Jara ◽  
Juliana Correa Borges ◽  
Luiz Orcirio Fialho de Oliveira ◽  
Urbano Pinto Gomes de Abreu ◽  
...  
Keyword(s):  
Pregnancy Rate ◽  
Breeding Season ◽  
Chorionic Gonadotropin ◽  
Artificial Insemination ◽  
Fixed Time ◽  
Beef Cows ◽  
Device Removal ◽  
Oestradiol Benzoate ◽  
Timed Artificial Insemination ◽  
Equine Chorionic Gonadotropin

The objective of this trial was to evaluate different post-timed artificial insemination (TAI) reproductive managements in postpartum beef cows to produce crossbred calves from artificial insemination (AI). Nellore cows (n = 607), with 45 days postpartum, were inseminated at a fixed time, using a protocol that included an intravaginal progesterone-releasing device along with oestradiol benzoate, prostaglandin, equine chorionic gonadotropin, and oestradiol cypionate, followed TAI 48 h post-device removal. Four post-TAI treatments were evaluated: in CONTROL (T1, n = 161), cows were exposed to Nellore clean-up bulls until the end of the breeding season (75 days). In OBSERVATION (T2, n = 132), heat detection was performed for 15–25 days post-TAI, followed by AI. In RESYNC22 (T3, n = 157) and RESYNC30 (T4, n = 157), resynchronisation started after 22 or 30 days, following second TAI at Day 32 or 40 days after first TAI. In T2, T3 and T4, after the second AI, cows were exposed to Nellore clean-up bulls until the end of the breeding season (75 days). The pregnancy rate (PR) for the first TAI did not differ (54.6%, 53.0%, 59.2%, and 51.6% for CONTROL, OBSERVATION, RESYNC 22, and RESYNC 30, respectively; P = 0.66), and no difference was observed for the second TAI (RESYNC 22 = 45.31% and RESYNC30 = 46.05%; P = 0.137), in the PR at the end of the breeding season (86.33%, 86.36%, 78.98%, and 81.52%, P = 0.43), or embryonic losses (4.54%, 2.85%, 6.45% and 7.40%, respectively; P = 0.61), but the percentage of crossbred pregnancy was higher in groups with resynchronisation (RESYNC22 and RESYNC30) than CONTROL and OBSERVATION (98.38%, 90.62%, 63.30%, 78.95%, P < 0.001). In conclusion, resynchronisation programs of 22 or 30 days are more efficient to produce AI products, and the final pregnancy rate is similar among the treatments, differing only in the amount of calves produced by AI.

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