Precocidade sexual, eficiência reprodutiva e desempenho produtivo de matrizes jovens Nelore e cruzadas

Reggiori, M. R.; Júnior, R.A.A. Torres; Menezes, G.R.O.; Battistelli, J. V. F.; Silva, L. O. C; Alencar, M. M. de; Oliveira, Janine; Faria, F. J. C.

doi:10.1590/1678-4162-8933

Cited by 12 publications

(6 citation statements)

References 8 publications

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“…Although the larger number of discarded heifers generated a good capital inflow in these simulated scenarios, this was not enough to improve economic viability when compared to the simulated scenarios with Nellore x Angus crossbreeding. These results support two arguments: i) Precocity is one of the desired characteristics for increasing economic efficiency in calf rearing systems (Formigoni et al, 2005;Reggiori et al, 2016); ii) Adequate nutrition in the growing season is essential to advance puberty, this effect being more noticeable in Angus females or their crossbreeds (Gasser et al, 2006;Moriel et al, 2014;Cardoso et al, 2014;Ferraz et al, 2018).…”

Section: Journal Of Agricultural Studiessupporting

confidence: 67%

The Economy of Puberty and Early Pregnancy Diagnosis in Nellore and Nellore X Angus Females

Diaz-Rodriguez¹,

Ojeda-Rojas²,

Pugliesi³

et al. 2020

JAS

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Cash flows were developed to verify, over a 15-year period, the effect of anticipating puberty (using feedlot and nutritional supplementation) and pregnancy diagnosis (using conventional transrectal ultrasound or color Doppler) on the net present value (NPV) of farms dedicated to producing Nellore (Bos taurus indicus) or Nellore x Angus (Bos taurus taurus) crossbred calves. In addition, in order to determine the effect of input prices on the viability of the enterprise, an economic analysis was carried out with the historical prices paid and received by Brazilian farmers over a 10-year period. Multiple regression was the statistical technique used to construct models that adequately described the relationships between the various independent variables (genetic group, nutritional strategy, pregnancy diagnosis technique, and relative market prices) and the dependent variable, which was represented by the NPV economic indicator. The fact that Nellore x Angus females reached puberty earlier than Nellore females favored the number of weaned calves and therefore, the NPV of the enterprise. Conducting pregnancy diagnosis earlier increased the project’s NPV by R$ 2.7 million (≈ US$ 0.77 million). Although feedlot and supplementation represent 65% of production costs, obtaining reasonable growth rates by providing animals with proper feeding improved the NPV significantly. Finally, after analyzing the effect of historical prices of the main inputs in the system, we concluded that the cost of inputs affects the performance of the enterprise the most.

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Section: Journal Of Agricultural Studiessupporting

confidence: 67%

The Economy of Puberty and Early Pregnancy Diagnosis in Nellore and Nellore X Angus Females

Diaz-Rodriguez¹,

Ojeda-Rojas²,

Pugliesi³

et al. 2020

JAS

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“…Tradicionalmente a idade média ao primeiro serviço das novilhas do rebanho de corte brasileiro ocorre aos três anos (36 meses) (GOTTSCHALL et al, 2007). Resultados semelhantes foram observados por Reggiori et al (2016), relatou a idade ao primeiro parto de fêmeas da raça nelore aos 38 meses. O intervalo entre os partos foram semelhantes nos dois períodos (Tabela 1), porém observa-se um ligeiro aumento dos dias não produtivos das fêmeas no intervalo do segundo ao terceiro parto, provavelmente em função das falhas de detecção do cio e na inseminação.…”

Section: Resultados E Discussõesunclassified

Eficiência Reprodutiva De Novilhas Nelore Ao Longo De Três Estações De Monta Consecutivas: Índices Reprodutivos E Ecônomicos

Morais¹,

Aguiar²,

Faria³

et al. 2018

Ciência, Tecnologia E Desenvolvimento Rural: Compartilhando Conhecimentos Inovadores E Experiências

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“…F1 heifers gained more weight than Nelore in both seasons, which was expected due to the heterosis effect and the higher growth capacity of Angus breed (Fialho et al, 2015;Reggiori et al, 2016). Therefore, the crossbred animals can increase the productive of the beef system, which highlight the importance of knowing more about the heat tolerance and parasite resistance/tolerance of this genetic resource.…”

Section: Discussionmentioning

confidence: 96%

Relationship of weight gain with infrared temperatures in Nelore and F1 (Nelore × Angus) heifers reared in two forage production systems1

Paim

Goulart

Silva

et al. 2018

Journal of Animal Science

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Intensive production systems require high-yield genetics as obtained in Bos taurus x Bos indicus crossbreeding. Generally, high-producing taurine cattle are more susceptible to parasites and heat stress. This study evaluated animal performance, heat-stress measurement (infrared temperatures) and internal parasite infection with daily weight gain in heifers from two genetic groups (Nelore and F1 - Nelore x Angus) reared in two forage production systems (with or without crop-livestock system) during one year. The main objectives were determine the relationship between infrared measures and animal performance and whether it differ between genetic groups and environments. Thirty-six heifers were randomly assigned to two forage production systems, one considered as high-input system with crop-livestock system and other exclusive livestock system considered as low-input. At each 28 days, infrared temperatures (IR), weight and internal parasite infection (fecal egg count) were measured. The temperatures of the eye, snout, forehead, dewlap, body, ground and squeeze chute were determined. F1 heifers had higher weight gain than Nelore (P<0.05) and both did not differ in internal parasite infection (P>0.05). F1 heifers had higher IR than Nelore (P<0.05). The main body points that differentiate between genetic groups were dewlap, forehead and eye. Higher dewlap IR temperature (DW) was associated with higher average daily gain (ADG) during dry season (independently of genetic groups) (ADG = -0.755 + 0.032*DW; R2=0.44). Otherwise, the IR temperatures had a negative relationship with ADG during rainy season and low forehead IR temperature was related to higher average daily gain (ADG = 1.81 - 0.033*forehead; R2=0.12 for F1 animals and ADG = 1.46 - 0.025*forehead; R2=0.07 for Nelore). The infrared temperatures were more related to animal performance during the dry season, which had high temperature and low humidity. The infrared temperatures were able to identify the animal response to the environment challenge. Animals with higher temperatures (dewlap and forehead) had higher daily gain during the dry season.

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Precocidade sexual, eficiência reprodutiva e desempenho produtivo de matrizes jovens Nelore e cruzadas

Cited by 12 publications

References 8 publications

The Economy of Puberty and Early Pregnancy Diagnosis in Nellore and Nellore X Angus Females

The Economy of Puberty and Early Pregnancy Diagnosis in Nellore and Nellore X Angus Females

Eficiência Reprodutiva De Novilhas Nelore Ao Longo De Três Estações De Monta Consecutivas: Índices Reprodutivos E Ecônomicos

Relationship of weight gain with infrared temperatures in Nelore and F1 (Nelore × Angus) heifers reared in two forage production systems1

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