Synchronization treatments previous to natural breeding anticipate and improve the pregnancy rate of postpartum primiparous beef cows

Ferreira, Roberta Machado; Conti, T. L.; Gonçalves, Reuel Luiz; Souto, Lucas; Sales, J. N. S.; Filho, M. F. Sá; Elliff, Flávia Morag; Baruselli, Pietro Sampaio

doi:10.1016/j.theriogenology.2017.11.022

Cited by 12 publications

(8 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The results of reproductive efficiency in this study corroborate the results obtained by Sá Filho et al (2015), who evaluated the effect of TAI reproductive efficiency of lactating Nellore cows and concluded that the use of this biotechnology significantly increased the proportion of pregnant cows at the start of the breeding season when compared with animals that were only with the bull. Our results are also in accordance with the results presented by Ferreira et al (2018), who also showed that TAI improved reproductive performance of primiparous and acyclic Nellore cows compared with the use of only NS.…”

Section: Discussionsupporting

confidence: 93%

Weaning weight and optimization of reproductive efficiency in Nellore females subjected to timed artificial insemination

Ferreira¹,

Mello²,

Silva³

et al. 2020

Revista Brasileira De Zootecnia

View full text Add to dashboard Cite

The objective of this study was to evaluate the effect of timed artificial insemination (TAI) on pregnancy rates, reproductive efficiency, and mean weaning weight of calves at the end of breeding season in Nellore females. In this work, 744 Nellore females were divided into two groups: in group I (n = 396), the females were subjected to natural service during the breeding season, which lasts for 180 days. In group II (n = 348), a hormonal protocol was performed for synchronization of ovulation, and the females were subjected to TAI. Afterwards, these latter females were then serviced by a cleanup bull until the end of the breeding season. The group II obtained a higher pregnancy rate as well as higher reproductive efficiency compared with group I. The weaning weight of group II calves was greater than that of group I. The use of TAI combined with cleanup bulls enables higher pregnancy rates and a better reproductive efficiency in relation to the use of only natural service. In addition, weaning calves born from TAI are heavier than calves born from natural service.

show abstract

Section: Discussionsupporting

confidence: 93%

Weaning weight and optimization of reproductive efficiency in Nellore females subjected to timed artificial insemination

Ferreira¹,

Mello²,

Silva³

et al. 2020

Revista Brasileira De Zootecnia

View full text Add to dashboard Cite

show abstract

“…These results are probably due to the progesterone effect as a cyclicity inducer and the administration of eCG in the removal of progesterone devices, which contribute to the dominant follicle growth and enables a better ovulation rate induced by estradiol esters . The eCG may be considered a fundamental substance in FTAI programs for postpartum beef cows, promoting an increase in the pregnancy rate in postpartum females (Ferreira et al, 2018;Pessoa et al, 2016).…”

Section: Discussionmentioning

confidence: 99%

Effect of the Postpartum Days on the Pregnancy Rate of Cows Submitted to Fixed-Time Embryo Transfer

Maistro

Gaitkoski²,

Hidalgo

et al. 2020

BJD

View full text Add to dashboard Cite

The present study aimed to analyze the influence of the postpartum period on the pregnancy rate of cows submitted to fixed-time embryo transfer (FTET). It was used one hundred thirty-one crossbreed embryo recipient cows, on the 79.35 th ± 28.0 days postpartum and BCS between 2.75 to 3.0. The cows received a hormonal protocol initiated on a random day of estrus cycle (D0), beginning with an intravaginal device containing 1.9 g of progesterone and intramuscular administration (IM) of 2 mg of estradiol benzoate. In D8, the intravaginal device was removed, and it was administered a 0.15 mg D-cloprostenol, 0.5 mg estradiol cypionate and 300 IU eCG IM. TheFTET of Senepol IVP embryos was performed on D17, without previous estrus observation. The recipient cows were divided into two experimental groups: until the seventh day postpartum (N = 70) and after the seventh day postpartum (N = 61). The pregnancy diagnosis was performed by transrectal ultrasonography (Mindray DP2200, 7.5 Mhz) on the 23 th day after ET. The pregnancy rate of the recipient's cows was 52% (68/131) and there was no difference (p>0.05) on the pregnancy rate of the recipient's cows regarding the embryo development stage, neither the postpartum period. In conclusion, the use of calving cows as embryos recipients may be a viable alternative, resulted in adequate pregnancy rates, optimizing the use of this animal category in embryo transfer programs.

show abstract

“…Estrus synchronization has the purpose of programming the estrous cycles of a group of females so that most of them will come in heat and ovulate within a short time frame. Estrus synchronization is mostly used in association with AI, but it can also be used in programs of timed-bull breeding, in which synchronized females are exposed to bulls for natural mating only (Ferreira et al 2018). Synchronization is achieved through the strategic use of hormones that are administered in compliance with synchronization protocols (Lamb and Mercadante 2016).…”

Section: Estrus Synchronizationmentioning

confidence: 99%

Analysis of the USDA’s 2017 Cow-Calf Management Practices Results: Part 2—Breeding Practices/Reproductive Technologies

Binelli

Bittar

Gonella-Diaza

2021

EDIS

View full text Add to dashboard Cite

show abstract

Synchronization treatments previous to natural breeding anticipate and improve the pregnancy rate of postpartum primiparous beef cows

Cited by 12 publications

References 32 publications

Weaning weight and optimization of reproductive efficiency in Nellore females subjected to timed artificial insemination

Weaning weight and optimization of reproductive efficiency in Nellore females subjected to timed artificial insemination

Effect of the Postpartum Days on the Pregnancy Rate of Cows Submitted to Fixed-Time Embryo Transfer

Analysis of the USDA’s 2017 Cow-Calf Management Practices Results: Part 2—Breeding Practices/Reproductive Technologies

Contact Info

Product

Resources

About