Caracterização fenotípica e genética da produção de leite e do intervalo entre partos em bubalinos da raça Murrah

Ramos, Alcides de Amorim; Malhado, Carlos Henrıque Mendes; Carneiro, Paulo Luız Souza; Gonçalves, Heraldo César; Azevêdo, Danielle Maria Machado Ribeiro

doi:10.1590/s0100-204x2006000800008

Cited by 37 publications

(28 citation statements)

References 9 publications

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“…This agrees with estimates reported in Brazil and Egypt (0.00 to 0.07) (AZIZ et al, 2001;CASSIANO et al, 2004;RAMOS et al, 2006;MALHADO et al, 2009). The heritability for AFC (Table 3) indicates that this trait may respond reasonably well to selective breeding because it is a reproductive trait.…”

Section: Resultssupporting

confidence: 92%

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Genetic Parameter Estimates for Production and Reproduction Traits in Dairy Buffaloes

et al. 2016

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-The objective of this study was to determine the genetic variation in milk production, milk components, and reproductive traits in dairy buffaloes. A total of 9,318 lactation records from 3,061 cows were used to estimate the heritability of milk yield (MY), fat percentage (%F), protein percentage (%P), lactation length (LL), calving interval (CI), and age at first calving (AFC), as well as genetic and phenotypic correlations between these traits. Covariance components were estimated by Bayesian inference in a multitrait animal model using the GIBBS2F90 program. Contemporary groups and number of milkings (1 or 2) were included as fixed effects, age of dam at calving (linear and quadratic effects) as a covariate, and additive genetic, permanent environmental, and residual effects as random effects. The heritability estimates (± standard deviation) were 0.24 ± 0.02, 0.34 ± 0.05, 0.40 ± 0.05, 0.09 ± 0.01, 0.05 ± 0.01, and 0.16 ± 0.04 for MY, %F, %P, LL, CI, and AFC, respectively. The genetic correlations between MY and %F, %P, LL, CI, and AFC were -0.29, -0.18, 0.66, 0.08, and 0.24, respectively. Milk production and milk components showed sufficient genetic variation to obtain genetic gains through selection. The genetic correlations between MY and milk components were negative, and thus, undesirable because efforts to increase MY may decrease milk quality. Reproductive traits had little genetic influence, indicating that improvement of management would be sufficient to obtain better performance.Keywords: Buffalo. Genetic correlation. Heritability. Milk yield. ESTIMATIVAS DE PARÂMETROS GENÉTICOS PARA CARACTERÍSTICAS DE PRODUÇÃO E REPRODUÇÃO EM BÚFALOS LEITEIROSRESUMO -Objetivou-se determinar a variação genética na produção de leite, seus constituintes e características reprodutivas. Foram utilizadas 9.318 lactações de 3.061 búfalas para estimar as herdabilidades das características produção de leite (PL), porcentagem de gordura (%G), porcentagem de proteína (%P), duração da lactação (DL), intervalo entre partos (IEP) e idade ao primeiro parto (IPP), além das correlações genéticas e fenotípicas entre as mesmas. Os componentes de covariância foram estimados por inferência Bayesiana em análises multicaracterísticas utilizando um modelo animal e o programa computacional GIBBS2F90. Foram incluídos os grupos de contemporâneos e o número de ordenhas (1 ou 2) como efeitos fixos, a idade da búfala ao parto (efeitos linear e quadrático) como covariáveis e os efeitos genético aditivo, ambiental e residual como efeitos aleatórios. As estimativas da herdabilidade e seus desvios-padrão para PL, % G, %P, DL, IEP e IPP foram 0,24±0,02; 0,34±0,05; 0,40±0,05; 0,09±0,01; 0,05±0,01 e 0,16±0,04, respectivamente. As correlações genéticas entre a PL e %G, %P, DL, IEP e IPP foram -0,29; -0,18; 0,66; 0,08 e 0,24, respectivamente. A produção de leite e seus constituintes apresentaram variação genética suficiente para obtenção de ganhos genéticos pela seleção. As correlações genéticas entre produção de leite e seus constituintes for...

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Section: Resultssupporting

confidence: 92%

“…It is therefore possible to select for an increase in MY without interfering with the CI of the herd. Ramos et al (2006) and Malhado et al (2009) reported genetic correlations of -0.22 and -0.25, respectively, between these traits. These estimates suggest that selection for MY will result in genetic gains in CI.…”

Section: Resultsmentioning

confidence: 95%

Genetic Parameter Estimates for Production and Reproduction Traits in Dairy Buffaloes

et al. 2016

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“…The P305 mean observed in this study (1,813.5 ± 697.40 kg) was higher than that obtained by Tonhati et al (2000a, b) and Ramos et al (2006) of 1,259.47 kg, 1,496.00 kg and 1,650 ± 687 kg, respectively. However, ours is similar to those reported by Malhado et al (2007), 1,863.5 ± 677 kg, for this breed in Brazil and Shabade et al (1993) for Murrah buffaloes in India (1,892.21 kg).…”

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confidence: 74%

Genetic parameters for milk, fat and protein yields in Murrah buffaloes (Bubalus bubalis Artiodactyla, Bovidae)

et al. 2010

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The objective of the present study was to estimate genetic parameters for test-day milk, fat and protein yields and 305-day-yields in Murrah buffaloes. 4,757 complete lactations of Murrah buffaloes were analyzed. Co-variance components were estimated by the restricted maximum likelihood method. The models included additive direct genetic and permanent environmental effects as random effects, and the fixed effects of contemporary group, milking number and age of the cow at calving as linear and quadratic covariables. Contemporary groups were defined by herd-year-month of test for test-day yields and by herd-year-season of calving for 305-day yields. The heritability estimates obtained by two-trait analysis ranged from 0.15 to 0.24 for milk, 0.16 to 0.23 for protein and 0.13 to 0.22 for fat, yields. Genetic and phenotypic correlations were all positive. The observed population additive genetic variation indicated that selection might be an effective tool in changing population means in milk, fat and protein yields.

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“…(2000 a,b), which were 1,259.47 kg e 1,496.00 kg, respectively. However, the MY305 means were similar to the ones obtained by Ramos et al (2006) and Malhado et al (2007), being 1,650.00 kg and 1,863.50 kg, respectively. All of these studies were carried out in Brazil with Murrah buffaloes and indicated an increase in milk yield during lactation, due to management improvement and to a selection for the milk yield trait.…”

Section: Resultssupporting

confidence: 72%

Genetic parameters for milk yield analyzed by test-day models in Murrah buffaloes in Brazil

Aspilcueta-Borquis¹,

Bignardi²,

Seno³

et al. 2010

Ital J Animal Sci

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New statistical models for genetic parameters estimation based on longitudinal data have being proposed. In this study, information of 47,614 test day milk yield data from 1.578 buffaloes, with 4.757 complete lactation, which calves from 1985 to 2006, were considered. Single-, two- and multiple trait analyses were used and variance components were estimated by Restricted Maximum Likelihood. The model used to evaluate the milk yield at 305 days (MY305) trait included herd-year-calving season (contemporary group) and milking number as fixed effects, buffalo age at calving was considered as covariate (linear and quadratic effect) and additive genetic, permanent environmental, residual and the animal were considered random effects. The same effects were included in the test day milk yield model except the contemporary group defined as herd-year-test day month control. The heritability estimations for TDMY vary from 0.13 to 0.23 for single-trait analyses, from 0.13 to 0.24 for two-trait analyses and from 0.15 at 0.24 for the multiple-trait analyses. According to the three models analyzed, the higher heritability estimations were obtained in the third test month for all of them. The genetic correlations between the TDMY and MY305 were high and positive. In conclusion, the selection for TDMY trait will promote genetic changes to the same direction for MY305

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Caracterização fenotípica e genética da produção de leite e do intervalo entre partos em bubalinos da raça Murrah

Cited by 37 publications

References 9 publications

Genetic Parameter Estimates for Production and Reproduction Traits in Dairy Buffaloes

Genetic Parameter Estimates for Production and Reproduction Traits in Dairy Buffaloes

Genetic parameters for milk, fat and protein yields in Murrah buffaloes (Bubalus bubalis Artiodactyla, Bovidae)

Genetic parameters for milk yield analyzed by test-day models in Murrah buffaloes in Brazil

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