Genetic influences on clinical mastitis and its relationship with milk yield, season and stage of lactation

Bunch, Kathryn; Heneghan, D.J.S.; Hibbitt, K. G.; Rowlands, G.J.

doi:10.1016/0301-6226(84)90011-3

Cited by 36 publications

(9 citation statements)

References 8 publications

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“…These values are similar to results obtained by Bunch et al (1984) and Coffey (1985) for cows. The correlations between morphological traits of udders and teats and the SCC of milk from Polish Lowland and Merino ewes are given in Tables 2 and 3. Among the udder traits of Lowland ewes, only its depth, longitudinal circumference and distance between teats showed a significant positive correlation with the mean (for the whole period of lactation) LSCC value.…”

Section: Resultssupporting

confidence: 91%

“…The health of the mammary gland affects its productivity. Negative genetic and phenotypic correlations (within the limits of -0.2 to -0.4) have been found very frequently between the somatic cell count in milk and the milk yield of cows (Hibbitt, 1983;Bunch et al, 1984;Batra, 1986). Studies carried out on sheep (Mackie and Rodgers, 1986;Fthenakis and Jones, 1987) have proven that deterioration of udder health has a negative effect on milk yield and, in effect, on lamb rearing results.…”

Section: Introductionmentioning

confidence: 99%

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Morphological characteristics of udders as selection criteria for improvement of mammary gland health and productivity of sheep. 2. The relationship between udder morphology and the health and productivity of ewes

Charon¹

1993

J. Anim. Feed Sci.

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The health of the mammary gland and productivity of three breeds of sheep, Polish Merino, Polish Lowland and Polish Highland, were studied in relation to udder morphology. The contamination of milk by pathological strains of bacteria (Staphylococci and Streptococci) was found in 15-20% of ewes. The ewes with over-or undersized (> x ± SD, < x + SD) udders developed mastitis more frequently than did those with udder sizes within the limits of x ± SD. Significant correlations were found between the morphological traits of udders and milk yield of the Polish Highland ewes and the rearing results of Merino and Polish Lowland lambs.

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Section: Resultssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Morphological characteristics of udders as selection criteria for improvement of mammary gland health and productivity of sheep. 2. The relationship between udder morphology and the health and productivity of ewes

Charon¹

1993

J. Anim. Feed Sci.

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“…These results may reflect a relationship between CM incidence and the magnitude of the recursive effect to MY. Incidence of CM decreases as lactation progresses [1,3], and so did the recursive effect from CM to the following test-day MY, possibly because of reduced variation. Both the recursive linear model and the recursive Gaussian-threshold model showed negative effects from (liability to) CM to MY, and these effects decreased from lactation period 1 to later periods.…”

Section: Estimation Of Recursive Effects Using Gaussian-thresholdmentioning

confidence: 99%

Exploration of lagged relationships between mastitis and milk yield in dairy cows using a Bayesian structural equation Gaussian-threshold model

Heringstad

Gianola

2008

Genet. Sel. Evol.

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-A Gaussian-threshold model is described under the general framework of structural equation models for inferring simultaneous and recursive relationships between binary and Gaussian characters, and estimating genetic parameters. Relationships between clinical mastitis (CM) and test-day milk yield (MY) in first-lactation Norwegian Red cows were examined using a recursive Gaussian-threshold model. For comparison, the data were also analyzed using a standard Gaussian-threshold, a multivariate linear model, and a recursive multivariate linear model. The first 180 days of lactation were arbitrarily divided into three periods of equal length, in order to investigate how these relationships evolve in the course of lactation. The recursive model showed negative within-period effects from (liability to) CM to test-day MY in all three lactation periods, and positive between-period effects from test-day MY to (liability to) CM in the following period. Estimates of recursive effects and of genetic parameters were time-dependent. The results suggested unfavorable effects of production on liability to mastitis, and dynamic relationships between mastitis and test-day MY in the course of lactation. Fitting recursive effects had little influence on the estimation of genetic parameters. However, some differences were found in the estimates of heritability, genetic, and residual correlations, using different types of models (Gaussian-threshold vs. multivariate linear).Bayesian inference / mastitis / milk yield / structural equation model / threshold model

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“…1 Calavas et al (1996) estudando a recorrência de mastite clínica em vacas, entre lactações, observaram uma maior tendência de ocorrência desse fenômeno entre o primeiro e o quinto dia pós-parto, mas os autores não se preocuparam em estudar a possível relação entre doenças digitais e da glândula mamária. A possibilidade de recorrência da mastite clínica foi também apontada por Cobo-Abreu et al (1979), Bunch et al (1984) e Dohoo & Martin (1984). Syvajarvi et al (1986) relacionaram a recorrência de mastite a um componente genético que, segundo Nickerson (1985) o processo poderia ser explicado pela dificuldade de mobilização da imunidade local nos primeiros estágios da lactação.…”

Section: Resul Resul Resul Resul Results T T T Tados E Discus Ados E Dunclassified

Enfermidades digitais em vacas de aptidão leiteira: associação com mastite clínica, metrites e aspectos epidemiológicos

et al. 2004

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RESUMO RESUMO RESUMO RESUMO RESUMO.-Utilizaram-se nesse estudo 5300 vacas de aptidão leiteira, provenientes de 80 propriedades rurais, que adotavam manejo intensivo ou semi-extensivo, com o objetivo de averiguar a existência de possível associação entre enfermidades digitais, mastite clínica e/ou metrite e identificar possíveis fatores de risco das enfermidades digitais. Em 325 (6,13%) vacas foram diagnosticados apenas enfermidades digitais, em 35 (0,66%) enfermidades digitais e mastite clínica, em 52 (0,98%) enfermidades digitais e metrite, em 28 (0,53%) enfermidades digitais, mastite clínica e metrite, em 128 (2,42%) apenas metrite, em 165 (3,11%) somente mastite clínica, e em 89 (1,68%) vacas metrite e mastite clínica. As mudanças bruscas na alimentação, o excesso de sujidades nas instalações, os pisos irregulares e abrasivos, a não utilização ou uso incorreto de pedilúvio, a falta de casqueamento preventivo, a ausência de quarentena, e a aquisição de animais sem a preocupação com o aspecto sanitário foram considerados os fatores de risco de maior ocorrência. Foi constatada diferença significativa entre a ocorrência de enfermidades digitais, mastite clínica e metrite, além de associação fraca entre tais enfermidades, concluindo-se que não houve relação expressiva entre enfermidades podais, mastite clínica e metrite em vacas lactantes.Enfermidades digitais em vacas de aptidão leiteira: Enfermidades digitais em vacas de aptidão leiteira: Enfermidades digitais em vacas de aptidão leiteira: Enfermidades digitais em vacas de aptidão leiteira: Enfermidades digitais em vacas de aptidão leiteira: associação com mastite clínica, metrites e aspectos associação com mastite clínica, metrites e aspectos associação com mastite clínica, metrites e aspectos associação com mastite clínica, metrites e aspectos associação com mastite clínica, metrites e aspectos epidemiológicos epidemiológicos epidemiológicos epidemiológicos epidemiológicos 1 With the objective to investigate a possible association between foot diseases, clinical mastitis and/or metritis and predisposing factors for foot diseases, 5300 dairy cows from 80 intensive and semi-intensive farms were used. In 325 (6.13%) cows only foot disease was diagnosed, in 35 (0.66%) foot disease and clinical mastitis, in 52 (0.98%) foot disease and metritis, in 28 (0.53%) foot disease, clinical mastitis and metritis, in 128 (2.42%) only metritis, in 165 (3.11%) only clinical mastitis, and in 89 (1.68%) cows metritis and clinical mastitis. Rapid changes in the diet, high exposure time of hoof horn to slurry and wet conditions, concrete floors, use of footbaths, low frequency of claw trimming, irregular quarantine, and no attention to health aspects during acquisition of the animals were considered as major risk factors for the occurrence of those diseases. The McNemar test for dependent samples showed significant statistical differences between the occurrence of foot disease, clinical mastitis and metritis, in spite of the poor association between those diseases. It was concluded...

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Genetic influences on clinical mastitis and its relationship with milk yield, season and stage of lactation

Cited by 36 publications

References 8 publications

Morphological characteristics of udders as selection criteria for improvement of mammary gland health and productivity of sheep. 2. The relationship between udder morphology and the health and productivity of ewes

Morphological characteristics of udders as selection criteria for improvement of mammary gland health and productivity of sheep. 2. The relationship between udder morphology and the health and productivity of ewes

Exploration of lagged relationships between mastitis and milk yield in dairy cows using a Bayesian structural equation Gaussian-threshold model

Enfermidades digitais em vacas de aptidão leiteira: associação com mastite clínica, metrites e aspectos epidemiológicos

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