Resynchronization improves reproductive efficiency of suckled Bos taurus beef cows subjected to spring-summer or autumn-winter breeding season in South Brazil

Pessoa, G. A.; Martini, A. P.; Filho, M. F. Sá; Rubin, M. I. B.

doi:10.1016/j.theriogenology.2018.08.021

Cited by 13 publications

(11 citation statements)

References 17 publications

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“…The present study showed that scenarios that used TAI protocols produced more and heavier calves when compared to the ONM scenario. This result is in accordance with several in vivo experiments that show that TAI increases the productivity of the herd Pessoa et al, 2018). This fact is mainly mediated by three factors: 1) TAI allows to use semen from better bulls.…”

Section: Effect Of the Scenario On Productive Parameterssupporting

confidence: 91%

“…This scenario resulted in 61% of PR, a result that may seem low; however, similar results have been presented in other in vivo studies. For example, Pessoa et al (2018) found 45.1% of PR in suckled cows and Ferreira et al 2018 The present simulation model proves the importance of using clean-up bulls after the TAI protocols. In the scenarios that included three TAI + NM when compared to those that only used three TAI, the number of weaned calves, weaning weights, total PRs, calving counters at sale, and the age of the cows at culling were greater.…”

Section: Effect Of the Scenario On Productive Parameterssupporting

confidence: 59%

“…For this reason, the use of programs involving TAI, which helps to restore postpartum cyclicity, allows greater service rates and, consequently, a better reproductive performance. Also, in the present simulation, the use of one TAI or two and three TAI increased the average total PR to 78.78, 83.47, and 86.82%, respectively Pessoa et al (2018). reported PR values of 71.0% for one TAI and 83.7 and 81.5% for two TAI with 40 and 32 days between AIs, respectively.…”

supporting

confidence: 52%

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>b<An agent-based simulation model to evaluate the technical, economic and financial performance of reproductive technologies in beef cattle>/b<

Ojeda-Rojas¹

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Section: Effect Of the Scenario On Productive Parameterssupporting

confidence: 91%

Section: Effect Of the Scenario On Productive Parameterssupporting

confidence: 59%

supporting

confidence: 52%

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>b<An agent-based simulation model to evaluate the technical, economic and financial performance of reproductive technologies in beef cattle>/b<

Ojeda-Rojas¹

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“…Although the ideal time for beef cattle breeding season in beef cattle happens when there is a more significant pasture offer (Pessoa et al, 2018), this generally corresponds to periods of higher temperatures and humidity. The increase of external temperature can to induce the increasing the body temperature, that in turn affect oocyte quality and follicle size (Castaño et al, 2014;Clements et al, 2017) as well to increase the pregnancy losses (Schüller et al, 2014;Schüller et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Body Temperature and Reproductive Performance of Beef Heifers Supplemented With Rumen-Protected Methionine

Dominguez

Lopes

Machado

et al. 2020

JAS

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This study aimed to assess the reproductive performance and body temperature of beef heifers supplemented with rumen-protected methionine (RPM) in an extensive grazing system and mated during the summer. One hundred 5/8 Angus 3/8 Brahman heifers were homogeneously divided into the control group (n=48, CG) supplemented with mineral salt ad libitum and methionine group (n=52, MG) who received the same supplementation plus 4 g of methionine per 100 g of mineral salt. The groups were fixed-time artificial inseminated (FTAI) 45 days after starting the supplementation. On day 0 of the FTAI protocol, ten animals per group received data-logger thermometers attached in progesterone implants recording the body temperature of the animals every 30 minutes. Pregnancy diagnosis was performed on days 30 and 60 after the artificial insemination to determine the rates of conception, pregnancy, and pregnancy loss. At the beginning of the supplementation, both groups had similar weights (MG was 304.6 kg and CG 304.4 kg), while on days 0 and 30 about the FTAI protocol, the MG was higher weight (365.9 vs. 346.7 and 384.8 vs. 371.5 Kg). During the FTAI protocol, the MG had lower body temperatures (38.77 vs. 38.99 °C) and a tendency to have larger dominant follicles than the CG (11.76 mm x 10.8 mm). Although it did not impact reproductive performance, the observed higher weight, dominant follicle sizes, and lower body temperatures during FTAI protocols show the potential benefits of methionine supplementation in beef heifers mated during the summer.

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“…Cows that become pregnant earlier in the breeding season will calf earlier in the next calving season, and, consequently, will have additional time to recover before the next breeding season. Reproductive management using exclusively FTAI have been developed using resynchronization programs (Colazo et al, 2007;Pessoa et al, 2018). Recent studies have shown that is possible to obtain better results than natural breeding and estrus detection-based AI (Bo & Baruselli, 2014;Campos et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Strategic feeding supplementation: An alternative for sustainability of beef production in native pastures

Siqueira

Oliveira²,

Araldi³

et al. 2019

Int J Innov Educ Res

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The present study aimed to evaluate the effects of a strategic feeding supplementation protocol on reproductive and economic results of exclusively fixed timed artificial inseminated (FTAI) beef cows from a southern Brazilian herd. The experiment was carried out over 2 consecutive breeding seasons (2016 and 2017, from October to January). Two-hundred, 3 and 4 years old, non-suckled, Angus cows (n=100/year), were divided into two homogeneous groups (by weight and body condition score) 25 days before the first FTAI of the breeding season (First FTAI=Day 0). As a representation of traditional management of herds grazing on natural pastures from Rio Grande do Sul Province, Brazil, cows from control group (CG; n=100; 50 cows in each year) received basic mineral supplementation (without protein an energy) ad libitum during the entire experimental period. As an alternative feeding protocol, supplemented group (SG; n=100; 50 in each year) received a mineral supplementation enriched with protein (23%), energy (44% NDT) and sodium monensin (0.25%) ad libitum from days: –25 to 80 of breeding season. Cows were maintained in 2 separated paddocks of native pasture with similar forage composition and availability. All cows were submitted to a progesterone/estradiol-based estrus synchronization protocol on day -10, and cows not pregnant at diagnosis were resynchronized on days 28 and 76 using the same hormonal treatment. There was no year effect (P>0.1) on weight gain and reproductive results, data from both breeding seasons were polled together for further analyzes. Cows from SG presented higher average daily weight gain and gained more weight than cows from CG (p<0.001). Conception rate was higher for SG than CG at the first FTAI cycle (p<0.05). No differences between groups were detected on final pregnancy rates (CG=80% and SG=88%; p>0.1). Cows from SG became pregnant earlier (p<0.01) during the breeding seasons. Also, the feeding supplementation provided an opportunity to increase gross margin. In conclusion, strategic feeding supplementation of beef cows grazing in natural pasture and submitted exclusively to fixed timed artificial insemination increases cows’ weight gain, anticipates pregnancies during the breeding season and can increase profit margin when compared to traditional management adopted in southern Brazil.

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Resynchronization improves reproductive efficiency of suckled Bos taurus beef cows subjected to spring-summer or autumn-winter breeding season in South Brazil

Cited by 13 publications

References 17 publications

>b<An agent-based simulation model to evaluate the technical, economic and financial performance of reproductive technologies in beef cattle>/b<

>b<An agent-based simulation model to evaluate the technical, economic and financial performance of reproductive technologies in beef cattle>/b<

Body Temperature and Reproductive Performance of Beef Heifers Supplemented With Rumen-Protected Methionine

Strategic feeding supplementation: An alternative for sustainability of beef production in native pastures

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