Progestagens and Equine Chorionic Gonadotropin Therapy for Synchronization of Ovarian and Estrous Activity in Goats Primed with Prostaglandins, During the Breeding Season

2021 ◽  
Vol 71 (1) ◽  
pp. 118
Author(s):  
Nelly nez ◽  
Froyl Magana ◽  
Jose Armijo ◽  
Javier ndez ◽  
Arnoldo Reyna
Keyword(s):  
Breeding Season ◽  
Chorionic Gonadotropin ◽  
Equine Chorionic Gonadotropin ◽  
Gonadotropin Therapy

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 (eCG) enhances reproductive responses in CIDR-EB treated lactating anovular Nili-Ravi buffalo during the breeding season

2018 ◽  
Vol 196 ◽  
pp. 28-34 ◽  
Author(s):  
Abdul Saboor Khan ◽  
Muhammad Shafiq Haider ◽  
Mubbashar Hassan ◽  
Ali Husnain ◽  
Muhammad Rizwan Yousuf ◽  
...  
Keyword(s):  
Breeding Season ◽  
Chorionic Gonadotropin ◽  
Equine Chorionic Gonadotropin

scholarly journals Effect of barium selenate injections on fertility of Pirlak ewes subjected to estrus synchronization during non-breeding season

2017 ◽  
Vol 73 (8) ◽  
pp. 479-482 ◽  
Author(s):  
Mushap Kuru ◽  
Osman Sogukpinar ◽  
Mustafa Makav ◽  
Nebi Cetin
Keyword(s):  
Pregnancy Rate ◽  
Breeding Season ◽  
Litter Size ◽  
Chorionic Gonadotropin ◽  
Conception Rate ◽  
Transrectal Ultrasonography ◽  
Estrus Synchronization ◽  
Equine Chorionic Gonadotropin ◽  
Synchronization Protocol ◽  
Lambing Rate

This study was aimed at determining the effect of barium selenate injections on the fertility of Pirlak ewes which had been subjected to progesterone-assisted estrus synchronization during the non-breeding season. A total of 150 Pirlak ewes between the ages of 2 and 5 years were used in the study. Sponges containing progesterone were inserted into the vaginas of the ewes for 11 (groups I and III) or 14 days (groups II and IV) for the purpose of estrus synchronization, and 500 IU equine chorionic gonadotropin (eCG) was administered on the day of sponge removal. In addition, barium selenate was injected s.c. immediately before estrus synchronization protocol in groups I and III. After the sponges had been removed, estrus was observed for four days. The ewes were mated with fertile rams. The pregnancy was determined by transrectal ultrasonography 30 days after mating. It was observed that the estrus rate, pregnancy rate, conception rate, lambing rate, twinning rate, and litter size were not statistically different (P > 0.05) between the groups, but estrus onset was different (P < 0.001). In conclusion, barium selenate injections did not affect the fertility parameters before progesterone-assisted synchronization was applied to the Pirlak ewes during the non-breeding season

scholarly journals Oestrus synchronisation with progesterone-containing sponge and equine chorionic gonadotropin in Pirlak ewes during the non-breeding season: can Toryum improve fertility parameters?

2020 ◽  
Vol 64 (4) ◽  
pp. 573-579
Author(s):  
Mushap Kuru ◽  
Buket Boga Kuru ◽  
Osman Sogukpinar ◽  
Cigdem Cebi Sen ◽  
Hasan Oral ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Pregnancy Rate ◽  
Breeding Season ◽  
Chorionic Gonadotropin ◽  
Survival Rates ◽  
Multiple Birth ◽  
Omega 3 ◽  
Experimental Animals ◽  
Equine Chorionic Gonadotropin ◽  
The Relationship

AbstractIntroductionThe aim of the study was to determine the effect of the vitamins, omega-3 polyunsaturated fatty acid and minerals in the supplement Toryum administered before and during oestrus synchronisation on some fertility parameters of ewes during the non-breeding season.Material and MethodsThe experimental animals were clinically healthy Pirlak ewes, 55–75 days postpartum, aged 2–4 years and weighing 40–50 kg. A sponge was inserted into the vagina for 10 d (G1, n = 30; G2, n = 30) or 14 d (G3, n = 30; G4, n = 30) for oestrus synchronisation, and on the day of removal, 400 IU equine chorionic gonadotropin was injected. Toryum soft capsules were administered individually (1 capsule/ewe p.o.) to G1 and G3 ewes seven days before the sponge was inserted and on the day it was removed. Oestrus detection was started 12 h after sponge removal. Pregnancy was diagnosed by transrectal ultrasonography on the 30th day after mating.ResultsThe pregnancy rate was statistically different between G1 and G4 (P < 0.05). The onset of oestrus was statistically different (P < 0.001) between the 10-d groups (G1 and G2) and the 14-d groups (G3 and G4). The litter size and oestrus, conception, lambing, multiple birth, and survival rates were not significantly different between the groups (P > 0.05).ConclusionToryum administered to Pirlak ewes during progesterone-based oestrus synchronisation protocols during the non-breeding season may increase pregnancy rates. The relationship between Toryum and fertility parameters in ewes would be better understood by comprehensive studies.

279 ReBreed21, a Rapid Reinsemination Program: Fertility in Bos Indicus Cattle of Different Parities

2021 ◽  
Vol 99 (Supplement_3) ◽  
pp. 145-146
Author(s):  
João Paulo N Andrade ◽  
Pedro L Monteiro ◽  
Alexandre B Prata ◽  
Adelino Robl ◽  
José Leite ◽  
...  
Keyword(s):  
Blood Flow ◽  
Breeding Season ◽  
Doppler Ultrasound ◽  
Chorionic Gonadotropin ◽  
False Positive ◽  
Bos Indicus ◽  
Reproductive Efficiency ◽  
High Fertility ◽  
Pregnancy Diagnosis ◽  
Equine Chorionic Gonadotropin

Abstract This study evaluated efficiency of a reinsemination program allowing timed AI (TAI) every 21 days (ReBreed21; RB21) vs. a traditional Resynch program in Nellore females (n = 2,085) of different parities. First TAI followed estradiol (E2)/progesterone (P4)-based synchronization, and was considered d0. For RB21 (n= 1,357), cows received P4 insert on D12. On D19, P4 was removed, followed by treatment with equine chorionic gonadotropin (eCG) and 0.6 mg E2 Cypionate (RB21+EC, n = 60) or nothing (RB21, n=687). On D21, Doppler ultrasound was used to determine CL blood flow [&lt; 25%=nonpregnant (NP)] and NP cows received TAI immediately together with 25µg licerelin acetate (GnRH). A second RB21 program using the same groups was done in cows that received TAI on D21 to allow a third potential TAI on D42. Pregnancy diagnosis was performed on D33 after each TAI. Cows designated pregnant on D21 but NP on D33, were termed False-Positive (FP). On D33, all control (n = 728) designated NP and FP cows were resynchronized with P4+E2 protocol for the second TAI at D42. Data were analyzed with SAS and shown in Table 1. For all cows, there were no differences in the three groups (Control, RB21, RB21+EC) for pregnancy/AI (P/AI). In nulliparous heifers, cumulative pregnancies were greater for both RB21 groups compared to Controls at D21 or D42 of the breeding season. Primiparous cows had greater cumulative pregnancies at D21 but not D42. Primiparous cows at second TAI had lower P/AI in RB21 (34.2%) vs. Control (51.7%); however, RB21-EC (55.8%) was similar to Control. No other parities had differences between RB21 and RB21+EC. Multiparous cows had high fertility at first TAI [69.3% (418/603)] and no differences between groups in cumulative pregnancies (P = 0.23). Thus, ReBreed21 program increases the reproductive efficiency in Nulliparous and Primiparous but not Multiparous Bos Indicus cattle. Adding EC to RB21 program only improves P/AI in Primiparous cows.

scholarly journals Synchronization Protocols in Spanish Merino Sheep: Reduction in Time to Estrus by the Addition of eCG to a Progesterone-Based Estrus Synchronization Protocol

2015 ◽  
Vol 15 (2) ◽  
pp. 409-418 ◽  
Author(s):  
Juan Carlos Gardón ◽  
Begoña Escribano ◽  
Susana Astiz ◽  
Salvador Ruiz
Keyword(s):  
Breeding Season ◽  
Chorionic Gonadotropin ◽  
Economic Efficiency ◽  
Medroxyprogesterone Acetate ◽  
Pregnancy Rates ◽  
Estrus Synchronization ◽  
Merino Sheep ◽  
Ewe Lambs ◽  
Equine Chorionic Gonadotropin ◽  
Synchronization Protocol

Abstract An appropriate management of reproduction allows ewes to breed at a more intensive rhythm, more compatible with economic efficiency of farms. Hence, the objectives of the present work were to evaluate a traditional estrus synchronization protocol (based on medroxyprogesterone acetate-impregnated intravaginal sponges combined or not with equine chorionic gonadotropin) on a Merino sheep herd during the breeding season, in order to determine the best working protocol for this breed. A total of 277 sheep, blocked by age (200 ewes and 77 ewe lambs) were randomly allocated to four groups, two of ewes (E and Ee) and two of ewe lambs (L and Le). All females received 60 mg MAP (medroxyprogesterone acetate) sponges on the first day. At the day of removal the animals of groups Ee and Le received 450 IU of eCG (equine chorionic gonadotropin). Mean estrus synchronization rate was 92.06% and similar among groups. Time to estrus was shorter for Ee (46.93±12.44 h) and Le (44.34±10.76 h), when compared to treatments without eCG (60.60±20.46 h and 58.68±17.72 h for E and L, respectively; P<0.05 for both). Pregnancy rates were 71.35 and 72.86% for ewes and ewe lambs, respectively, and similar among groups. Lambing rates were lower in ewes (1.36) than in ewe lambs (1.85) with no significant effect of eCG. The study demonstrates the efficacy of the synchronization method with MAP and the reduction in the time to estrus induced by eCG in Spanish Merino ewes and ewe lambs during the breeding season.

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