scholarly journals Impact of Equine Chorionic Gonadotropin Associated with Temporary Weaning, Estradiol Benzoate, or Estradiol Cypionate on Timed Artificial Insemination in Primiparous Bos Indicus Cows

2016 ◽  
Vol 59 (0) ◽  
Author(s):  
Andre Luis Bastos Souza ◽  
◽  
Marcio Saporski Segui ◽  
Luiz Ernandes Kozicki ◽  
Romildo Romulado Weiss ◽  
...  
Keyword(s):  
Chorionic Gonadotropin ◽  
Artificial Insemination ◽  
Bos Indicus ◽  
Estradiol Benzoate ◽  
Timed Artificial Insemination ◽  
Equine Chorionic Gonadotropin

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.

Equine chorionic gonadotropin improves the efficacy of a progestin-based fixed-time artificial insemination protocol in Nelore (Bos indicus) heifers

2010 ◽  
Vol 118 (2-4) ◽  
pp. 182-187 ◽  
Author(s):  
M.F. Sá Filho ◽  
J.R.S. Torres-Júnior ◽  
L. Penteado ◽  
L.U. Gimenes ◽  
R.M. Ferreira ◽  
...  
Keyword(s):  
Chorionic Gonadotropin ◽  
Artificial Insemination ◽  
Bos Indicus ◽  
Fixed Time ◽  
Equine Chorionic Gonadotropin

scholarly journals Application of low dose of equine chorionic gonadotropin at acupoint Hou Hai for fixed-time artificial insemination in beef cows

2019 ◽  
Vol 40 (6) ◽  
pp. 2625
Author(s):  
Monna Lopes de Araújo ◽  
Claudinéia Silva Mendes ◽  
Carmo Emanuel Almeida Biscarde ◽  
Fernando Henrique Almeida Biscarde ◽  
Laiara Fernandes Rocha ◽  
...  
Keyword(s):  
Normal Distribution ◽  
Chorionic Gonadotropin ◽  
Artificial Insemination ◽  
Low Dose ◽  
Cost Effective ◽  
Fixed Time ◽  
Beef Cows ◽  
Estradiol Benzoate ◽  
Significant Difference ◽  
Equine Chorionic Gonadotropin

This study evaluated the efficiency application of low dose of equine chorionic gonadotropin (eCG) using Hou Hai acupoint for fixed-term artificial insemination (FTAI) in beef cows. Seventy cows received intravaginal devices with progesterone, and 3 mg of estradiol benzoate on day zero (D0) of FTAI. On D9, the devices were removed, and 150 ?g of prostaglandin F2? was applied; the animals were then randomly distributed to three treatment groups: T1 (n = 23), 300 IU of eCG intramuscularly (IM); T2 (n = 23), 90 IU of eCG at acupoint Hou Hai; and T3 (n = 25), 90 IU of eCG at false acupoint IM. On D10, the animals received 1 mg of gonadotropin-releasing hormone IM, and FTAI was performed, 52 h after the devices were removed. The quantitative variables with normal distribution were assessed using analysis of variance at 5% probability. For variables that did not show normal distribution, Kruskal-Wallis test at 5% probability was used. No significant difference was noted among the groups (P > 0.05) for the interval between device withdrawal at ovulation (58.2 ± 12.2 h), diameter of the largest follicle on D9 (9.9 ± 2.2 mm), diameters of the ovulatory follicle (12.2 ± 3.0 mm) and the second largest follicle (6.7 ± 2.1 mm), follicular growth rate (0.8 ± 0.3 mm/d), ovulation rate (82%), corpus luteum size (2.32 ± 0.35 cm2), and pregnancy rate (58.67%). The protocol cost per animal was US$ 10.67 (T1) and US$ 8.50 (T2 and T3). The use of 90 IU of eCG applied at Hou Hai acupoint or at false acupoint caused satisfactory synchronization of estrus in beef cows. In addition, this procedure was cost-effective.

scholarly journals Effect of follicular growth promoters on timed artificial insemination in dairy cows.

2020 ◽  
Vol 26 (1) ◽  
pp. e1966
Author(s):  
Ítalo Câmara-de-Almeida ◽  
Fabrício Albani-Oliveira ◽  
Ana P Madureira ◽  
Graziela Barioni ◽  
Ciro A Alves-Torres
Keyword(s):  
Pregnancy Rate ◽  
Body Condition ◽  
Artificial Insemination ◽  
Body Condition Score ◽  
Estradiol Benzoate ◽  
Control Treatment ◽  
Growth Promoters ◽  
Timed Artificial Insemination ◽  
Equine Chorionic Gonadotropin ◽  
And Control

Objective. To evaluate the efficiency of equine chorionic gonadotropin (eCG) and follicle stimulating hormone (FSH) on the pregnancy rate of crossbred cows from different body condition score (BCS) in the postpartum period in timed artificial insemination (TAI). Material and methods. The cows were subjected to the same hormone protocol: Day zero (D0), progesterone-release intravaginal device (PRID) and 2 mg estradiol benzoate (EB); D8, withdrawal of PRID, application 0.150 mg of prostaglandin. On D8, the animals were distributed into three treatments: 1 – (TeCG; n = 98) injection of 300 IU eCG; 2 – (TFSH; n = 84) injection of 20 mg of FSH and; 3 – (Control; n = 115) without further treatment. On D9, all animals received 1 mg of EB; D10, TAI of all the cows. After 30 days from TAI, ultrasound diagnosis of pregnancy was performed. Results. Pregnancy rate did not differ among eCG (52.04%), FSH (40.47%), and Control (40.00%) treated cows (p>0.05). In cows with low body condition, the pregnancy rate was higher (p<0.05) for cows treated with eCG (41.46%) when compared to FSH (18.18%) and Control (17.07%) cows. The postpartum interval among treatments was similar (p>0.05) (35–65 or 66–95days). Conclusions. The use of eCG or FSH did not result in an increase in the pregnancy rate when compared to the control treatment; however, eCG improved the pregnancy rate of cows with low body condition scores.

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