Estimativas de parâmetros genéticos e fenotípicos de características do pelame e de desempenho reprodutivo de vacas holandesas em clima tropical

Bertipaglia, Elaine Cristina Abaker; Silva, Alexandre Rodrigues; Cardoso, Victor José Mendes; Maia, Alex Sandro Campos

doi:10.1590/s1516-35982007000200011

Cited by 14 publications

(11 citation statements)

References 23 publications

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“…The heritability estimates for FCI (0.13 to 0.14) were not affected by the inclusion of short lactations; however, it showed slight superiority when model b was used. The values obtained in the present study were superior to those obtained by Val et al (2004), which were 0.10 for the Holstein breed; and Facó et al (2008), which were 0.05 for the Girolando breed, but inferior to the value obtained by Bertipaglia et al (2007) with Holstein cows (0.19).…”

Section: Discussioncontrasting

confidence: 83%

Effect of inclusion or non-inclusion of short lactations and cow and/or dam genetic group on genetic evaluation of Girolando dairy cattle

Canaza-Cayo¹,

Silva²,

Cobuci³

et al. 2016

Genet. Mol. Res.

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ABSTRACT. The objective of this study was to evaluate the effects of inclusion or non-inclusion of short lactations and cow (CGG) and/or dam (DGG) genetic group on the genetic evaluation of 305-day milk yield (MY305), age at first calving (AFC), and first calving interval (FCI) of Girolando cows. Covariance components were estimated by the restricted maximum likelihood method in an animal model of single trait analyses. The heritability estimates for MY305, AFC, and FCI ranged from 0.23 to 0.29, 0.40 to 0.44, and 0.13 to 0.14, respectively, when short lactations were not included, and from 0.23 to 0.28, 0.39 to 0.43, and 0.13 to 0.14, respectively, when short lactations were included. The inclusion of short lactations caused little variation in the variance components and heritability estimates of traits, but their non-inclusion resulted in the re-ranking of animals. Models with CGG or DGG fixed effects had higher heritability estimates for all traits compared with models that consider these two effects simultaneously. We recommend using the model with fixed effects of CGG and inclusion of short lactations for the genetic evaluation of Girolando cattle.

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Section: Discussioncontrasting

confidence: 83%

Effect of inclusion or non-inclusion of short lactations and cow and/or dam genetic group on genetic evaluation of Girolando dairy cattle

Canaza-Cayo¹,

Silva²,

Cobuci³

et al. 2016

Genet. Mol. Res.

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“…This protection differs according to many factors such as coat thickness (CT) and hair characteristics (Silva 2008;Maia et al 2009). Substantial research has been conducted to analyse the relationship between coat characteristics and livestock productivity and other traits that are not directly related to thermoregulation (Bertipaglia et al 2007(Bertipaglia et al , 2008. McManus et al (2009), analysing five sheep groups, found that animals that showed lower respiratory rate (RR), rectal temperature (RT) and heart rate are characterized by better coat traits to heat adaptation.…”

Section: Introductionmentioning

confidence: 99%

Thermoregulatory responses related to coat traits of Brazilian native ewes: an adaptive approach

Leite

Façanha

Costa

et al. 2017

Journal of Applied Animal Research

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Semi-arid conditions can adversely affect livestock productivity and change certain physiological parameters. The relationship between hair coat and thyroxine levels in Morada Nova ewes was evaluated through environmental factors, such as air temperature, relative air humidity, radiant and Black Globe Humidity Index to gain a better understanding of thermoregulation mechanisms in these animals. Measurements were taken from July to January in 383 Morada Nova ewes. The variables studied included rectal temperature (RT), respiratory rate (RR), coat thickness (CT), hair length (HL), hair diameter (HD), hair density (D) and thyroid hormones. The data underwent multivariate statistical analyses and a significant inverse relationship was found between coat traits and Thyroxine (T 4 ). The animals that exhibited greater HL, coat density and CT showed lower T 4 concentrations. Coat traits showed a strong interaction with physiological mechanisms and can be considered relevant in maintaining homeostasis. Hair traits play an important role in this process, since T 4 reduction was stronger in animals that showed difficulties in eliminating heat, which were the ones that had greater HL, hair density and HD. By contrast, animals with a hair coat more favourable to heat losses had higher levels of thyroid hormones. ARTICLE HISTORY

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“…The animals, in general, are adaptable, able to maintain the life and performance in a wide range of physical, chemical, biological and social environments (BERTIPAGLIA et al, 2007). However, the understanding of the relationship between the animal and the complex environmental interactions is not yet fully defined .…”

Section: Introductionmentioning

confidence: 99%

Prediction of free-stall occupancy rate in dairycattle barns through fuzzy sets

Campos¹,

Castro²,

Schiassi

et al. 2013

Eng. Agríc.

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ABSTRACT:The goal of this study was to develop a fuzzy model to predict the occupancy rate of free-stalls facilities of dairy cattle, aiding to optimize the design of projects. The following input variables were defined for the development of the fuzzy system: dry bulb temperature (T db , °C), wet bulb temperature (T wb , °C) and black globe temperature (T bg , °C). Based on the input variables, the fuzzy system predicts the occupancy rate (OR, %) of dairy cattle in free-stall barns. For the model validation, data collecting were conducted on the facilities of the Intensive System of Milk Production (SIPL), in the Dairy Cattle National Research Center (CNPGL) of Embrapa. The OR values, estimated by the fuzzy system, presented values of average standard deviation of 3.93%, indicating low rate of errors in the simulation. Simulated and measured results were statistically equal (P>0.05, t Test). After validating the proposed model, the average percentage of correct answers for the simulated data was 89.7%. Therefore, the fuzzy system developed for the occupancy rate prediction of free-stalls facilities for dairy cattle allowed a realistic prediction of stalls occupancy rate, allowing the planning and design of free-stall barns. KEYWORDS:Confinement systems, bovine facilities, design, stalls, dairy cattle. PREDIÇÃO DA TAXA DE OCUPAÇÃO DE BAIAS EM INSTALAÇÕES TIPO FREE-STALL PARA BOVINOS DE LEITE POR MEIO DOS CONJUNTOS FUZZY RESUMO:Objetivou-se com o presente trabalho desenvolver um modelo fuzzy para predizer a taxa de ocupação de baias em instalações para gado de leite do tipo free-stall, auxiliando na otimização do dimensionamento de projetos. Para o desenvolvimento do sistema fuzzy, foram definidas como variáveis de entrada: a temperatura de bulbo seco (T bs , °C); temperatura de bulbo úmido (T bu , °C), e temperatura de globo negro (T gn ,ºC). Com base nas variáveis de entrada, o sistema fuzzy prediz a taxa de ocupação (TO,%) de vacas leiteiras em instalações do tipo free-stall. Para a validação do modelo, coletas de dados foram realizadas nas instalações do Sistema Intensivo de Produção de Leite (SIPL), do Centro Nacional de Pesquisa de Gado de Leite (CNPGL) da Embrapa. Os valores de TO estimados pelo sistema fuzzy apresentaram valores de desvio-padrão médio de 3,93%, indicando baixo índice de erros na simulação. Os resultados simulados foram, estatisticamente, iguais aos medidos (P>0,05, Teste t). Após a validação do modelo proposto, a porcentagem de acerto médio para os dados simulados foi de 89,7%. Portanto, o sistema fuzzy, desenvolvido para a predição da taxa de ocupação de baias em instalação free-stall para bovinos leiteiros, possibilitou a predição realística da taxa de ocupação de baias, propiciando o planejamento e o projeto de instalações free-stall. PALAVRAS-CHAVE:Sistema de confinamento, instalações para bovinos, projeto, baias, vacas leiteiras.

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Estimativas de parâmetros genéticos e fenotípicos de características do pelame e de desempenho reprodutivo de vacas holandesas em clima tropical

Cited by 14 publications

References 23 publications

Effect of inclusion or non-inclusion of short lactations and cow and/or dam genetic group on genetic evaluation of Girolando dairy cattle

Effect of inclusion or non-inclusion of short lactations and cow and/or dam genetic group on genetic evaluation of Girolando dairy cattle

Thermoregulatory responses related to coat traits of Brazilian native ewes: an adaptive approach

Prediction of free-stall occupancy rate in dairycattle barns through fuzzy sets

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