Morbidity-mortality and performance evaluation of Brahman calves from in vitro embryo production

Pimenta-Oliveira, Andreza; Filho, José Paes de Oliveira; Dias, Adriano; Gonçalves, Roberto Calderón

doi:10.1186/1746-6148-7-79

Cited by 9 publications

(7 citation statements)

References 34 publications

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“…Parturitions in IVP-derived pregnancies are known to have a tendency to be more difficult than AI pregnancies [29,51,52,56]. In our study, three IVP pregnancies were considered difficult while all AI calving were evaluated as easy, not being statistically relevant.…”

Section: Discussionmentioning

confidence: 89%

“…Gestation lengths are reported to be longer for IVP pregnancies in some studies [15,[47][48][49][50][51][52], but similar to AI in others [5,53]. It should be noted that the percentage of induced parturitions was higher in IVP (regardless of the RF or BSA supplementation) pregnancies than AI pregnancies (with a tendency to be significantly different), and those pregnancies lengths (n = 7) were not accounted for mean gestation length, which if it did, would probably contribute to an increase in the mean gestation length.…”

Section: Discussionmentioning

confidence: 98%

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Reproductive Outcomes and Endocrine Profile in Artificially Inseminated versus Embryo Transferred Cows

Lopes

Alcázar-Triviño²,

Soriano‐Úbeda

et al. 2020

Animals

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The increasing use of in vitro embryo production (IVP) followed by embryo transfer (ET), alongside with cryopreservation of embryos, has risen concerns regarding the possible altered pregnancy rates, calving or even neonatal mortality. One of the hypotheses for these alterations is the current culture conditions of the IVP. In an attempt to better mimic the physiological milieu, embryos were produced with female reproductive fluids (RF) as supplements to culture medium, and another group of embryos were supplemented with bovine serum albumin (BSA) as in vitro control. Embryos were cryopreserved and transferred while, in parallel, an in vivo control (artificial insemination, AI) with the same bull used for IVP was included. An overview on pregnancy rates, recipients’ hormonal levels, parturition, and resulting calves were recorded. Results show much similarity between groups in terms of pregnancy rates, gestation length and calves’ weight. Nonetheless, several differences on hormonal levels were noted between recipients carrying AI embryos especially when compared to BSA. Some calving issues and neonatal mortality were observed in both IVP groups. In conclusion, most of the parameters studied were similar between both types of IVP derived embryos and the in vivo-derived embryos, suggesting that the IVP technology used was efficient enough for the safe production of calves.

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Section: Discussionmentioning

confidence: 89%

Section: Discussionmentioning

confidence: 98%

Reproductive Outcomes and Endocrine Profile in Artificially Inseminated versus Embryo Transferred Cows

Lopes

Alcázar-Triviño²,

Soriano‐Úbeda

et al. 2020

Animals

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“…Calves born by NM showed lower BBW than those born by ET. Likewise, Pimenta-Oliveira et al [ 29 ], found differences in birth weight of the offspring between the IVP embryos and AI. Nonetheless, Lopes et al [ 30 ], compared the growth of calves born by ET with those from AI, and their results showed much similarity between groups in terms of pregnancy rates, gestation length and calves’ birth weight.…”

Section: Discussionmentioning

confidence: 96%

“…As with BBW and WBW, the average daily weight gain (ADG: NM 0.72; ET 0.92) was statistically associated with all the study variables. Effectively, Pimenta-Oliveira et al [ 29 ] found no differences in ADG between ET and AI. This effect could be due to a similar selection process for dams and bulls in both reproductive techniques, thus not affecting the weight of the offspring until weaning.…”

Section: Discussionmentioning

confidence: 99%

Effects of Season on Donor and Recipient Cows and Calf Performance from Birth to Weaning in Embryo Transfer Programs in the Tropics

Martínez

Galina

Ortiz

et al. 2021

Animals

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The aim of this study was to assess the seasonal effect of an embryo transfer program in the tropics on the donor response, recipient reproductive performance and calf growth from birth to weaning. This study included five-year records from 145 donors, 1149 embryo transfers (ET) and 609 in calves. The effect of the season (dry or wet) was evaluated at the time of embryo flushing, embryo transfer and birth of the calves. There was a seasonal effect on the yield and quality of the embryos. The number of nonfertilized and transferable good quality embryos increased in the wet season. For the recipients, the probability of pregnancy after an ET decreased by 6% for each year of the dam’s age. However, no seasonal effect was found when comparing ET calves with their control group (natural mating—NM), nevertheless, weaning weight was associated with birth body weight, treatment, sex of the calf, season at birth, year of treatment, and dam’s age. Calves born by NM had lower average daily gain (ADG), and male calves registered higher gains than females. Likewise, calves born during the rainy season had lower ADG compared with calves born during the dry season. In conclusion, this study shows that seasonal effect is more apparent in donor and calf performance than in the recipients.

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“…Brazil is an important country for cattle breeding for milk and meat, having one of the largest herds in the world. Brazilian livestock production is characterised by large-scale extensive operations under grazing conditions using mainly natural mating or artificial insemination (AI) as reproductive strategies, although the use of in vitro embryo production (IVP) has increased each year for animals of high genetic value (Pimenta-Oliveira et al 2011). In contrast, there have only been a few studies of genetic diseases in the Brazilian cattle herd.…”

Section: Introductionmentioning

confidence: 99%

Prevalence of mutations responsible for glycogen storage disease type-II and congenital myasthenic syndrome in Brazilian Brahman cattle

et al. 2018

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Glycogen storage disease type II (GSD-II) and congenital myasthenic syndrome (CMS) are important autosomal recessive disorders in Brahman cattle. The objective of this study was to investigate the presence of mutations responsible for GSD II (E7, c.1057_1058delTA; and E13, c.1783C>T) and CMS (c.470del20) in purebred Brazilian Brahman cattle and in purebred Brahman bulls that were routinely used in breeding programs in Brazil. A total of 276 purebred Brahman cattle (167 females and 109 males, with ages ranging from 12-24 months) and 35 frozen semen samples taken from purebred Brahman bulls (22 bulls from the USA, 11 Brazilian bulls, one Argentine bull and one Australian bull) were used in this study. Genomic DNA was purified from hair root samples and from semen samples. Purified DNA was used in PCR genotyping to mutations c.1057_1058delTA (E7) and c.1783C>T (E13) in the GAA gene and c.470del20 in the CHRNE gene. The PCR products were purified and sequenced. The genotypic frequencies per polymorphism were estimated separately. Of the 276 Brahman cattle tested, 7.3% were identified as heterozygous for E7. All Brahman cattle studied were homozygous for the wild-type E13 allele. The E7 mutations was identified as heterozygous in 8.6% (3/35) of the commercial semen samples, whereas the E13 mutations was not identified. The c.470del20 mutation was identified as heterozygous in 0.73% of the hair root samples, but this mutation was not present in any semen sample assessed. No study had previously evaluated the prevalence of mutations responsible for GSD II or CMS in Brazilian Brahman cattle. In summary, the E7 and c.470del20 mutations are present in the Brazilian Brahman herd, and control measures should be adopted to prevent an increase in the incidence of GSD-II and CMS in Brahman cattle in Brazil.

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Morbidity-mortality and performance evaluation of Brahman calves from in vitro embryo production

Cited by 9 publications

References 34 publications

Reproductive Outcomes and Endocrine Profile in Artificially Inseminated versus Embryo Transferred Cows

Reproductive Outcomes and Endocrine Profile in Artificially Inseminated versus Embryo Transferred Cows

Effects of Season on Donor and Recipient Cows and Calf Performance from Birth to Weaning in Embryo Transfer Programs in the Tropics

Prevalence of mutations responsible for glycogen storage disease type-II and congenital myasthenic syndrome in Brazilian Brahman cattle

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