Culling
Mostrando 1-12 de 62 artigos, teses e dissertações.
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1. Identification of Sindhi cows that are susceptible or resistant to Haematobia irritans
Resumo Para identificar vacas susceptíveis e resistentes à Haematobia irritans, moscas-dos-chifres foram contadas quinzenalmente durante três anos em 25 vacas de um rebanho Sindhi. Modelos lineares de medidas repetidas foram criados, analisando os resultados de duas formas: 1) pela contagem das moscas, considerando susceptíveis as vacas nas quais a infes
Rev. Bras. Parasitol. Vet.. Publicado em: 29/08/2019
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2. Phenotypic relationships between type traits and productive life using a piecewise Weibull proportional hazard model
ABSTRACT: Longevity is an important trait due to its relationship with profitability. Type traits have been used as indirect predictors for productive life. The objective of this study was to evaluate the relationship of 20 type traits on length of productive life in Brazilian Holsteins, using a piecewise Weibull proportional hazard model. Three analyses wer
Sci. agric. (Piracicaba, Braz.). Publicado em: 2018-12
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3. A simulation model to evaluate the economic consequences of insemination programs in dairy herds: timed artificial insemination and sex-sorted semen
ABSTRACT The objective of this study was to develop a simulation model to analyse the technical, economic, and financial performance of using different reproductive strategies in dairy herds. Strategies simulated were: artificial insemination (AI) using conventional semen after oestrus detection (AIC), AI using sex-sorted semen after oestrus detection (AIS),
R. Bras. Zootec.. Publicado em: 29/11/2018
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4. Accuracy and simultaneous selection gains for N-stress tolerance and N-use efficiency in maize tropical lines
ABSTRACT Maize plants can be N-use efficient or N-stress tolerant. The first have high yields in favorable environments but is drastically affected under stress conditions; whereas the second show satisfactory yields in stressful environments but only moderate ones under optimal conditions. In this context, our aim was to assess the possibility of selecting
Sci. agric. (Piracicaba, Braz.). Publicado em: 2017-12
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5. BREED AND CARCASS CHARACTERISTICS ON LOSSES BY BRUISES AND MEAT PH IN BEEF OF STEERS AND CULLING COWS
Resumo Objetivou-se avaliar os efeitos de grupo genético, maturidade e escore de gordura de acabamento de bovinos sobre perdas por contusões e valor do pH final da carcaça de bovinos machos e fêmeas. O número de contusões e o valor final do pH das carcaças foram avaliados como variável resposta em função do grupo genético, da maturidade fisiológi
Ciênc. anim. bras.. Publicado em: 24/07/2017
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6. Diagnosis of mycobacteria in bovine milk: an overview
ABSTRACT Tuberculosis remains as the world’s biggest threat. In 2014, human tuberculosis ranked as a major infectious disease by the first time, overcoming HIV death rates. Bovine tuberculosis is a chronic disease of global distribution that affects animals and can be transmitted to humans by the consumption of raw milk, representing a serious public healt
Rev. Inst. Med. trop. S. Paulo. Publicado em: 05/06/2017
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7. Recent updates and perspectives on approaches for the development of vaccines against visceral leishmaniasis
Abstract: Visceral leishmaniasis (VL) is one of the most important tropical diseases worldwide. Although chemotherapy has been widely used to treat this disease, problems related to the development of parasite resistance and side effects associated with the compounds used have been noted. Hence, alternative approaches for VL control are desirable. Some metho
Rev. Soc. Bras. Med. Trop.. Publicado em: 2016-08
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8. Acidentes de trabalho relacionados ao abate de bovinos em Mato Grosso, Brasil
Abstract Introduction Cattle rising in the southern Amazon have grown rapidly, being Mato Grosso one of the top states in meat production. This growth led to the hiring of more workers to the chilling activity, increasing the number of workplace accidents in this sector. Objective To analyze the influence of slaughter cattle on occupational accidents and t
Cad. saúde colet.. Publicado em: 26/02/2016
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9. Predictive factors for Leishmania infantum infection in dogs examined at a veterinary teaching hospital in Teresina, State of Piauí, Brazil
Abstract: INTRODUCTION: In Brazil, culling of seropositive dogs is one of the recommended strategies to control visceral leishmaniasis. Since infectiousness is correlated with clinical signs, control measures targeting symptomatic dogs could be more effective. METHODS: A cross-sectional study was carried out among 1,410 dogs, predictive models were develop
Rev. Soc. Bras. Med. Trop.. Publicado em: 2016-02
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10. Evaluation of Free-Range broilers using the welfare quality® protocol
Scientific information on the welfare of broilers reared in alternative systems is scarce. The objective of this study was to assess the welfare of free-range broilers using the Welfare Quality® protocol. Free-range broilers reared in ten farms were observed, and measures were made in broilers of five of these farms. The collected data were transformed into
Rev. Bras. Cienc. Avic.. Publicado em: 2014-09
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11. Evaluation of parasitological examination, kDNA polymerase chain reaction and rK39-based immunochromatography for the diagnosis of visceral leishmaniasis in seropositive dogs from the screening-culling program in Brazil
Introduction Dogs play a primary role in the zoonotic cycle of visceral leishmaniasis (VL). Therefore, the accurate diagnosis of infected dogs, primarily asymptomatic dogs, is crucial to the efficiency of VL control programs. Methods We investigated the agreement of four diagnostic tests for canine visceral leishmaniasis (CVL): parasite detection, either
Rev. Soc. Bras. Med. Trop.. Publicado em: 2014-08
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12. Breeding objectives and economic values for traits of low input family-based beef cattle production system in the State of Rio Grande do Sul
The objectives of this study were to define breeding objectives and derive economic weights for production traits in family-based beef cattle systems, assess the sensitivity of these weights to changes in market and husbandry indicators and estimate the expected genetic changes in the selection criteria proposed. Based on data from the production systems, fa
Revista Brasileira de Zootecnia. Publicado em: 2012-02