Mês de parição, condição corporal e resposta ao protocolo de inseminação artificial em tempo fixo em vacas de corte primíparas

Meneghetti, M.; Vasconcelos, José Luiz Moraes

doi:10.1590/s0102-09352008000400002

Cited by 27 publications

(18 citation statements)

References 19 publications

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“…Thereafter, cows were categorized into 1 of 7 groups based on BCS at calving and BCS change from calving to pregnancy diagnosis: high-maintaining (HM), highlosing (HL), moderate-gaining (MG), moderatemaintaining (MM), moderate-losing (ML), lowgaining (LG) and low-maintaining (LM). Low BCS at calving and postpartum BCS loss negatively impacted percentage of pregnant females to TAI, with primiparous cows being the most sensitive to the effects of low BCS during the postpartum period (Tables 1, 2 Meneghetti and Vasconcelos (2008) evaluated the association between BCS change during the pre and postpartum periods in beef heifers (Nelore and crossbred Nelore/Angus) bred to AI and calving from September to December in Brazil. The BCS were evaluated monthly during pre and post-partum periods (June to February).…”

Section: Body Condition Score (Bcs)mentioning

confidence: 99%

“…Therefore, heifers will calve closer to the start of their subsequent breeding season and experience improved reproductive performance compared with heifers calving at earlier months. According to Meneghetti and Vasconcelos (2008), primiparous cows inseminated with a few days postpartum have greater BCS at TAI and more likely to become pregnant to TAI compared with primiparous cows with longer postpartum interval and smaller BCS at TAI.…”

Section: Condição Corporalmentioning

confidence: 99%

See 1 more Smart Citation

Reproductive programs for beef cattle: incorporating management and reproductive techniques for better fertility

Vasconcelos¹,

Carvalho²,

Peres³

et al. 2017

Anim Reprod

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This review summarizes strategies to increase overall pregnancy rates to TAI protocols, and potential areas for improvement in reproductive management of Nelore cows. Low BCS at calving and postpartum BCS loss negatively impacted percentage of pregnant females to TAI, with primiparous cows being the most sensitive to the effects of low BCS during the postpartum period. The current reproductive management recommended for replacement heifers (with TAI on day 0) consist of intravaginal progesterone device insertion from day -35 to -23, 0.6 mg i.m. injection of estradiol cypionate on day -23, insertion of another intravaginal progesterone device and 2.0 mg i.m. injection of estradiol benzoate on day -11, 12.5 mg i.m. injection of dinoprost tromethamine on day -4, intravaginal progesterone device removal and 0.6 mg i.m. injection of estradiol cypionate on day -2, and TAI on day 0. Supplementing corn for 41 days after the first TAI of the breeding season increased pregnancy to a second AI in primiparous cows, increased final proportion of pregnancy in primiparous cows, but decreased the final proportion of pregnancy in mature cows. In turn, supplementing melengestrol acetate or Ca salts of PUFA during the expected time of luteolysis was beneficial to pregnancy rates. Vaccinating cows against BoHV-1, BVDV, and Leptospira spp., particularly when both doses were administered before TAI, improved cow reproductive performance. Cow temperament has direct implications not only on reproductive efficiency of B. indicus females, but also on overall production efficiency in cow-calf system based on B. indicus cattle. Lastly, concentration of pregnancy-associated glycoproteins was driven by the ability of pregnancy maintenance and by sire used at TAI, whereas exploring this relationship might be interesting to improve sire fertility regarding late embryonic loss in Nelore females.

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Section: Body Condition Score (Bcs)mentioning

confidence: 99%

Section: Condição Corporalmentioning

confidence: 99%

Reproductive programs for beef cattle: incorporating management and reproductive techniques for better fertility

Vasconcelos¹,

Carvalho²,

Peres³

et al. 2017

Anim Reprod

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“…A inseminação artificial (IA) é uma das mais difundidas biotecnologias utilizadas como instrumento eficaz e econômico na reprodução de bovinos (NEVES et al, 2010). No entanto, seu uso vem se restringindo em função dos desafios operacionais, em particular quanto ao longo período de observação das matrizes e falhas no registro de estro clínico.…”

Section: Introductionunclassified

Uso do acetato de melengestrol após protocolos de inseminação artificial em tempo fixo em vacas Nelore multíparas

Silva¹,

Freiria

Angreves-Silva

et al. 2014

Rev. bras. saúde prod. anim.

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Objetivou-se avaliar a influência do fornecimento de 2,28g de MGA® Premix entre o 13º e 17º dia após a inseminação artificial em tempo fixo (IATF), na taxa de gestação de vacas da raça Nelore, pluríparas. Foram usadas 154 vacas, divididas em dois lotes ao acaso, o tratamento 1, n=55 e o tratamento 2, n=99. O tratamento 1 recebeu suplemento mineral e o tratamento 2o mesmo suplemento adicionado de 2,28g de MGA® Premix/animal/dia. Foi usada a estatística descritiva por tabela frequência, no programa SAS, pela interação do fornecimento de MGA® Premix com a taxa de gestação. A porcentagem de gestação foi superior para as vacas suplementadas com MGA® Premix e avaliados aos 43 dias após a inseminação. O uso de MGA® após IATF aumenta a sobrevivência embrionária e a taxa de prenhez.

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“…From the eighth to the ninth month of pregnancy, there is a 55% increase in energy requirement for pregnancy and, from the first to the third month postpartum, the energy required for lactation increases by 40%. If this increased demand for nutrients is not met with the available forage, it will result in negative energy balance, directly affecting reproduction (Meneghetti & Vasconcelos, 2008).…”

Section: Resultsmentioning

confidence: 99%

Reproductive efficiency of Nellore cows nursing Nellore or crossbred Simmental × Nellore calves

et al. 2013

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-The objective of this study was to analyze the influence of genetic group (GG) of the calf during gestation, mobilization of body reserves and period of postpartum anestrus in Nellore cows. Thirty-seven primiparous and multiparous cows were used: 24 gave birth to Nellore (NEL), and 13 gave birth to ½ Simmental × ½ Nellore (SIM) calves. According to the date of calving, cows were divided into three blocks, with intervals of 20 days between blocks. The body condition (BC) of the cows was estimated subjectively on a scale from 0 to 5 points, with intermediate grading of 0.5 points. We measured the thickness of subcutaneous fat (SF) between the 12th and 13th ribs and rump by ultrasound. Blood samples from each cow were collected weekly from the third week after birth until weaning, to analyze the level of progesterone; in the samples collected until 16 weeks postpartum, we analyzed the concentration of nonesterified fatty acids (NEFA). The gestation period of mothers of NEL calves was eight days longer, on average. The variables relating to the mobilization of body reserves (NEFA, BC and SF) were not influenced by calf GG, with the only significant effects being the number of days postpartum, with a peak in the concentration of NEFA between the sixth and eighth weeks and linear decrease in BC and NF. Mothers of NEL calves remained in anestrus for 4.6 weeks longer than the mothers of crossbred calves.

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Mês de parição, condição corporal e resposta ao protocolo de inseminação artificial em tempo fixo em vacas de corte primíparas

Cited by 27 publications

References 19 publications

Reproductive programs for beef cattle: incorporating management and reproductive techniques for better fertility

Reproductive programs for beef cattle: incorporating management and reproductive techniques for better fertility

Uso do acetato de melengestrol após protocolos de inseminação artificial em tempo fixo em vacas Nelore multíparas

Reproductive efficiency of Nellore cows nursing Nellore or crossbred Simmental × Nellore calves

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