Modelo bioeconômico para cálculo de custos e receitas em sistemas de produção de gado de corte visando à obtenção de valores econômicos de características produtivas e reprodutivas

Júnior, João Jorge; Cardoso, Victor José Mendes; Albuquerque, Lúcia Galvão de

doi:10.1590/s1516-35982006000700040

Cited by 19 publications

(8 citation statements)

References 8 publications

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“…Results that were found herein indicating positive emphasis for PR in the breeding objective are supported by the findings of Jorge Junior et al (). Improvement in PR results in increased number of animals that are born and, consequently, in increased off‐take that is available to generate income.…”

Section: Discussionsupporting

confidence: 89%

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Breeding objectives of Brangus cattle in Brazil

Simões

Leal

Minho

et al. 2019

J Animal Breeding Genetics

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Our goal was to define a breeding objective for Brangus beef cattle in Brazil. Bioeconomic models were produced and used to estimate economic values (EVs). The scenarios simulated were typical full‐cycle beef production systems that are used in tropical and subtropical regions. The breeding objective contained pregnancy rate (PR), warm carcass weight (WCW), mature cow weight (MCW), number of nematode eggs per gram of faeces (EPG) and tick count (TICK). Two models were used in series to estimate the EV. A deterministic model was used to simulate effects of PR, WCW and MCW on profitability with a constant parasite load. Subsequently, stochastic models were used to estimate economic values for TICK and EPG as consequences of their environmental effects on weight gains, mortality and health costs. The EV of PR, WCW, MCW, EPG and TICK, was US$1.59, US$2.11, −US$0.24, −US$5.35 and −US$20.88, respectively. Results indicate positive emphasis should be placed on PR (12.49%) and WCW (65.07%) with negative emphasis on MCW (13.92%), EPG (2.77%) and TICK (5.75%). In comparison with the indexes usually used, these results suggest a reformulation in the selection indexes of the beef production system in tropical and subtropical regions in order to obtain greater profitability.

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Section: Discussionsupporting

confidence: 89%

“…Similar estimates of profitability from the presented scenarios have been reported for Nelore breed (Jorge Junior, Cardoso, & Alburquerque, ). In all of the studied scenarios, supporting the cow herd was the greatest single cost, mainly due to the cost of feedstuffs.…”

Section: Discussionsupporting

confidence: 85%

Breeding objectives of Brangus cattle in Brazil

Simões

Leal

Minho

et al. 2019

J Animal Breeding Genetics

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“…In Brazil, the use of bioeconomic modelling remains limited, primarily because many farmers do not perform the orderly control of zootechnical herd information, nor of expenses and revenues in their production systems. However, several studies have demonstrated the potential use of these models in multiple trait selection, allowing to define and organize all information of the production system and to support the selection (Bittencourt, Lôbo, & Bezerra, 2006;Campos et al, 2014;Costa, Teixeira, Yokoo, & Cardoso, 2017;Jorge, Cardoso, & De Albuquerque, 2006;Laske et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Economic values and selection index in different Angus‐Nellore cross‐bred production systems

Fernandes

Savegnago

Faro

et al. 2018

J Animal Breeding Genetics

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Bioeconomic models were developed to calculate economic values (EV) for economically important traits in beef cattle, to evaluate the impact of these traits on production profitability, to assess possible market changes with a payment system and to develop economic selection indexes for Angus cattle for two production systems. Two beef cattle production systems were simulated as follows: a cow-calf cycle (CC) and a complete cycle (CoC). Following selection, positive changes in the EV were observed. In the CC, each 1.0% increment in weaning weight (WW), weaning rate (WR) and pregnancy rate (PR) resulted in increases in US$ 1.30, US$ 3.68 and US$ 3.55 per cow/year in profit, respectively. In the CoC, EV of US$ 1.01, US$ 1.79, US$ 1.19, US$ 1.34, US$ 6.84 and US$ 7.86 per cow/year were obtained for WW, year weight, yearling weight, final weight, WR and PR, respectively. The payment system for carcass quality showed that the scenario considering that 100% of the animals displayed uniform carcasses exhibited the highest EV and was considered optimal. Considering the sensitivity analysis, the price paid per animal was the factor that most affected the EV in both systems. The selection indexes obtained may be used in similar production systems, and the use of EV and selection indexes are important tools for any production system with positive change in profit after selection.

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“…Although reproductive traits are the main determinants of the biological and economic efficiency of beef cattle production systems, they are rarely included in selection indices of zebu breeds due to their low heritabilities and the difficulty involved in measuring them (Bittencourt et al, 2002;Formigoni et al, 2005;Jorge Junior et al, 2006. In the 1990's, some traits related to reproductive efficiency and sexual precocity were incorporated into genetic evaluation programs of beef cattle in Brazil (Alencar, 2002).…”

Section: Introductionmentioning

confidence: 99%

Genetic correlations between visual slaughter conformation scores and growth and reproductive traits in Canchim cattle

et al. 2016

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ABSTRACT. We obtained heritability and (co)variance component estimates for slaughter conformation scores at 420 days of age (SCS 420 ), age at calving (first, AFC; second, ASC), calving occurrence until 38 months of age (CP 38 ), weight at 420 days of age (W 420 ), and scrotal circumference at 420 days (SC 420 ) in Canchim (5/8 Charolais + 3/8 Zebu) cattle. A total of 23,168 records of Canchim animals, including 12,493 females and 10,675 males, were analyzed. SCS 420 indicated carcass structure, muscle development, and subcutaneous fat deposition. The slaughter conformation score of each animal was relative to the whole contemporary group; 1 corresponded to the lowest expression of the trait and 6 to the highest. Heritabilities, and genetic and residual correlation estimates between SCS 420 and reproductive and weight traits, were estimated by multitrait analyses using an animal model with Bayesian inference, employing a linear model for AFC, ASC, SC420, and W420 and a threshold model for CP38 and SCS420. Heritability estimates for SCS 420 , AFC, ASC, CP 38 , W 420 , and SC 420 were 0.11, 0.15, 0.15, 0.15, 0.30, and 0.30, respectively. Genetic correlation estimates between SCS 420 and the other traits were 0.08 (AFC), 0.58 (ASC), 0.08 (CP 38 ), 0.43 (W 420 ), and 0.17 (SC 420 ). Visual slaughter conformation scores respond to individual selection and can be used as selection criteria in Canchim cattle. Selection to improve sexual precocity would not be effective in improving carcass conformation and composition, and selection for animals with high breeding values for yearling weight may improve slaughter conformation at the yearling stage.

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Modelo bioeconômico para cálculo de custos e receitas em sistemas de produção de gado de corte visando à obtenção de valores econômicos de características produtivas e reprodutivas

Cited by 19 publications

References 8 publications

Breeding objectives of Brangus cattle in Brazil

Breeding objectives of Brangus cattle in Brazil

Economic values and selection index in different Angus‐Nellore cross‐bred production systems

Genetic correlations between visual slaughter conformation scores and growth and reproductive traits in Canchim cattle

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