Timed embryo transfer programs for management of donor and recipient cattle

Baruselli, Pietro Sampaio; Ferreira, Roberta Machado; Sales, J. N. S.; Gimenes, Lindsay Unno; Filho, Manoel Francisco de Sá; Martins, C. M.; Rodrigues, Carlos Alberto; Bó, G. A.

doi:10.1016/j.theriogenology.2011.06.006

Cited by 95 publications

(88 citation statements)

References 36 publications

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“…However, embryos at 3 days and older are thought to be more resistant to heat stress than oocytes and early stage embryos. Several studies observed that ET can be applied to dairy herds to improve fertility compared with AI, particularly during the hot season of the year (Ambrose et al, 1999;Baruselli et al, 2011;Chebel et al, 2008). Therefore, ET is a strategy that bypasses the negative effects of heat stress during the periods of follicular development and early embryonic development.…”

Section: Discussionmentioning

confidence: 99%

Effects of parity and season on pregnancy rates after the transfer of embryos to repeat-breeder Japanese Black beef cattle

Ono

Isobe²,

Morita

et al. 2016

Arch. Anim. Breed.

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Abstract. Repeat-breeder (RB) cows are a major source of economic waste due to their decreased fertility. Embryo transfer (ET) is an alternative tool to improve the fertility of RB cows. The aims of the present study were to evaluate the effects of recipient parity and the season on pregnancy rates following ET in RB Japanese Black beef cattle. Embryos were transferred nonsurgically to recipients, consisting of 155 heifers (< 2 years old) and 172 cows (< 8 years old), which were defined as RB cattle. Of the recipients that were presented for ET, 57 recipients received a fresh embryo and 270 recipients received a frozen embryo. There were no differences in the pregnancy rates between cattle that received fresh embryos or frozen embryos. The rates of recipients with pregnancy, abortion, stillbirth, and normal calving were similar between heifers and cows. In cows, the pregnancy rates were lower (P <0.05) in summer (June to August) than in spring (March to May) and winter (December to February). In heifers, however, there were no differences in the pregnancy rates among the seasons. Our findings indicate that in RB Japanese Black beef cattle, the parity of the recipients does not have an effect on the pregnancy rates following the transfer of fresh and frozen embryos. However, heat stress may affect reproductive performance in RB Japanese Black cows.

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Section: Discussionmentioning

confidence: 99%

Effects of parity and season on pregnancy rates after the transfer of embryos to repeat-breeder Japanese Black beef cattle

Ono

Isobe²,

Morita

et al. 2016

Arch. Anim. Breed.

View full text Add to dashboard Cite

show abstract

“…For example, Baruselli et al 2011, utilizing data from a large commercial herd in Brazil, showed that conception results can be increased in about ~8% (cooler months) to 20% (warmer months) percentage points with the use of ET when compared to AI (Fig. 4).…”

Section: Use Of Moet and Ivp In Dairy Herdsmentioning

confidence: 99%

“…Assuming no change in estrus detection rates at 60%, that represents at least some 7% increase in pregnancy rate results, or according to the Wisconsin model from the ReproMoney program, an extra $US140 dollars per cow per year, and yet not accounting for offspring with better genetics. The scenario for repeat-breeder cows in a comparison between AI and ET is even more dramatic, where conception results found by Baruselli et al 2011 increased in about 15 to 20% points, or using the same rationale, an extra 11% points in pregnancy results or $US220 dollars per cow per year.…”

Section: Use Of Moet and Ivp In Dairy Herdsmentioning

confidence: 99%

Genetic market in cattle (Bull, AI, FTAI, MOET and IVP): financial payback based on reproductive efficiency in beef and dairy herds in Brazil

Baruselli¹,

A²,

M³

et al. 2018

Anim Reprod

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A number of reproductive biotechnologies are currently available to multiply offspring from high genetic merit animals to enhance reproductive efficiency and profitability both in dairy and beef herds. Some of these technologies such as fixed time artificial insemination (FTAI), when correctly implemented, generally allow greater reproductive performance than natural breeding. Besides the use of frozen-thawed semen during artificial insemination, cattle recipients can also be synchronized to receive embryos (produced in vivo or in vitro) at set dates with fertility results that usually outperforms natural breeding as well as artificial insemination (AI), particularly during warm seasons and in repeat breeders cows. Altogether, the use of hormonal programs to synchronize ovulation time simplify field routine, can easily fix physiological limitations related to postpartum anestrus (beef cows), poor estrus detection efficiency due to less evident estrus signs (dairy cows), making AI and ET viable to commercial herds both in terms of results and economical returns.

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“…Thus, distinct hormonal treatments protocols are required for artificial insemination and superovulation (Baruselli et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Breed composition does not influence the performance of Holstein-Gyr crossbred as oocyte donors for OPU/IVP

et al. 2017

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Holstein-Gyr crossbred cattle are strategic for dairy systems in tropical countries, since they combine milk yield genetics with adaptability to tropical climate. However, Holstein (Bos taurus) and Gyr (Bos indicus) breeds present remarkable differences regarding reproductive physiology. Brazil stands out as the world's largest user of embryo in vitro production (IVP) in bovine, and the use of this technique is increasing in dairy systems. As Holstein-Gyr crossbreds are important oocyte donors for IVP, the present work aimed at investigating whether increased Gyr or Holstein breed composition influences donor's performance. Sixteen Holstein-Gyr crossbred females presenting increased (HG, 71.4 to 87.5% Holstein; n = 9) or decreased (GH, 40.2 to 46.6% Holstein; n = 7) Holstein composition were submitted to three ovum pick up (OPU) sessions. We observed similar (P = 0.2946) antral follicle count between HG and GH donors (24.8 ± 3.2 vs 29.4 ± 2.8 respectively; mean ± SEM). Groups also display similar morphological oocyte grading (Grade I: 0.1 ± 0.1 vs 0.1 ± 0.1 -P = 0.9680; Grade II: 0.9 ± 0.5 vs 1.9 ± 0.5 -P = 0.1942; Grade III, 4.0 ± 1.2 vs 7.2 ± 1.4 -P = 0.1047, HG vs GH respectively; mean ± SEM). Additionally, the proportion of viable oocyte was similar between HG and GH groups (27.8% vs 31.9%, respectively, P = 0.3500) and oocyte lipid area fraction (6.8% vs 9.5%, respectively; P = 0.1539). Our results indicate that the individual variation has more influence than breed composition of crossbred oocyte donors.

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Timed embryo transfer programs for management of donor and recipient cattle

Cited by 95 publications

References 36 publications

Effects of parity and season on pregnancy rates after the transfer of embryos to repeat-breeder Japanese Black beef cattle

Effects of parity and season on pregnancy rates after the transfer of embryos to repeat-breeder Japanese Black beef cattle

Genetic market in cattle (Bull, AI, FTAI, MOET and IVP): financial payback based on reproductive efficiency in beef and dairy herds in Brazil

Breed composition does not influence the performance of Holstein-Gyr crossbred as oocyte donors for OPU/IVP

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