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Hernandez A.,Institute Ciencia Animal | Ponce de Leon R.,Institute Ciencia Animal | Garcia S.M.,Empresa Pecuaria Genetica de Matanzas
Archivos de Zootecnia | Year: 2011

The records of 25 036 lactations of milk yield up to 305 days (13 495 in first lactation (L1), 6067 in the second (L2), 3445 in the third (L3) and 2029 in the fourth (L4), respectively) from 13 495 Cuban Mambí (3/4 Holstein 1/4 Cebú) cows were used. The cows calved between 1981 and 2006 in 173 herds of four genetic farms. The goal of this study was to estimate the heritability and genetic correlations the first four lactations (L1-L4) and determine if the first lactation could be considered as selection criteria for cows and sires of the breed. The REMLF90 program was used for estimating the (co) variance components and the genetic parameters by means of a multivariate animal model that included the contemporary group (herd-yearcalving season) as fixed effect, calving age as linear and quadratic covariable, and the animal and the error as random effects. The means for L1 up to L4 were of 1957 kg, 2086 kg, 2099 kg and 2106 kg, and the heritability values were of 0.22 ± 0.03, 0.17 ± 0.04, 0.22 ± 0.05 and 0.26 ± 0.06, respectively. The genetic correlations between the first four lactations were high, with values between 0.76 and 0.95. It was concluded that it is possible to obtain genetic gain through milk yield selection, that a common group of genes are affecting the different lactations, and that milk yield in the first lactation is a good indicator for productive performance of Cuban Mambí cows, that can be used as selection criteria.


Hernandez A.,Institute Ciencia Animal | De Leon R.P.,Institute Ciencia Animal | Garcia S.M.,Empresa Pecuaria Genetica de Matanzas | Guzman G.,Institute Ciencia Animal | Mora M.,Institute Ciencia Animal
Cuban Journal of Agricultural Science | Year: 2012

A total of 40 042 records of milk production accumulated up to 305 d (L305), of 15 260 Mambi de Cuba cows (3/4 Holstein ± Zebu), from four genetic enterprises and 177 herds were used. The study purpose was assessing the existence or not of interaction genotypeenvironment (IGE) for dairy production in two production levels: normal (P1, of the calving years 1981- 1990) and low (P2, of the calving years 1991-2006). A univaried animal model was applied for estimating the genetic parameters and values (GV) in both production levels and years (P3, of the calving years from 1981 to 2006). The combination herd-year-four-month period of calving, age at calving as linear and square co-variable, the animal random effects, the effect of the permanent environment and the residues were included as fixed effects. The Pearson's correlations between the GV of the 39 sires represented in both production levels were estimated. The heritability and repeatability were: 0.227 ± 0.029 and 0.473 ± 0.008, 0.059 ± 0.015 and 0.266 ± 0.014, 0.170 ± 0.020 and 0.418 ± 0.006, for the levels P1, P2 and P3, respectively. The correlation between the GV of the sires in P1 and P2 was of 0.66, so the effect of the interaction genotype-environment was proved. It is concluded that the environmental conditions should be considered for using the Mambi de Cuba sires.


Hernandez A.,Institute Ciencia Animal | Ponce de Leon R.,Institute Ciencia Animal | Garcia S.M.,Empresa Pecuaria Genetica de Matanzas | Garcia R.,Empresa Pecuaria Genetica de Matanzas | And 3 more authors.
Archivos de Zootecnia | Year: 2011

Data from 6335 cows of the Mambí de Cuba (3/4 Holstein 1/4 Zebu) breed from four genetic enterprises, with calving in the years from 1980 to 2005 were used to estimate the heritabilities and the genetic and phenotypic correlations of milk production in the first lactation (LPL), the total milk production accumulated for life (LTV), productive life (VP) and stayability for 36 month of productive life (HP36). The MTDFREML program was used to estimate the variance component using uni or bivariate animal model that included the fixed effect of herd-years-season of first calving, the age to first calving as lineal and quadratic covariable, and as random effect the animal and the residual. The means for LPL, LTV, VP and P36 were of 1990.9 kg, 9749.5 kg, 69.7 month, 0.77% and the heritabilities were of 0.15±0.03, 0.10±0.03, 0.05±0.02, 0.008±0.013. The genetic correlations of milk production acumulated for life with the longevity traits were high (0.59 and 0.80) and those between milk production in the first lactation and the longevity traits were low and antagonic (-0.13 and -0.16). In the genetic improvement of breed for selecting the future sire, besides milk production, traits that guarantee the stayability of the animals in the herd should be included.


Hernandez A.,Institute Ciencia Animal | De Leon R.P.,Institute Ciencia Animal | Garcia S.M.,Empresa Pecuaria Genetica de Matanzas | Guzman G.,Institute Ciencia Animal | Mora M.,Institute Ciencia Animal
Cuban Journal of Agricultural Science | Year: 2011

Records, between 1980 and 2006, of dairy females of the Mambi de Cuba breed (3/4 Holstein 1/4 Zebu), from four cattle rearing units were used to estimate the parameters and genetic tendencies of the growth traits up to reproduction (17 434 heifers), milk yield (50 420 lactations of 20 687 cows), reproduction (16 526 reproductive events of 5 881 cows), longevity (11 338 cows), survival and permanence (12 865 cows). A univariate animal model was used for estimating heritability, repeatability and breeding values, including the year-four month period-herd combination and the calving year as linear and quadratic co-variable as fixed effects, and the permanent environment and error as random effects. The heritabilities had values from moderate to low, with higher estimates for the weight per incorporation age (WIA) (0.20), calving interval (CI) (0.06), milk yield up to 244 d (M244) and 305 d (M305) (0.15), fat percentage (FP) (0.19), calving number (CN) (0.06) and 18 months of productive life (S18) (0.05). The highest repeatability estimate was for M244 y M305, with 0.42. The genetic tendencies for WIA, CI, M305, productive life (PL) and P36 were of 0.02 ± 0.01 g/d/year, -1.53 ± 0.16 d/year, -2.52 ± 1.10 kg/year, 0.05 ± 0.03 months/year and 0.0004 ± 0.0002 months/year, respectively. It was concluded that there was no change in the population means because the genetic tendencies had low values (between 0.001 and 0.31 % of the mean), due to the instability of the progeny tests and to the little female selection.


Hernandez A.,Institute Ciencia Animal | De Leon R.P.,Institute Ciencia Animal | Garcia S.M.,Empresa Pecuaria Genetica de Matanzas | Guzman G.,Institute Ciencia Animal | Mora M.,Institute Ciencia Animal
Cuban Journal of Agricultural Science | Year: 2011

In order to estimate the genetic parameters and the phenotypic and genetic trends of the CI and its relationship with the MY305, 16 526 records of the calving interval (CI) and the milk yield accumulated up to 305 d (MY305) of 5 881 Mambí de Cuba cows (3/4Holstein 1/4 Zebu), were used. The records were from four cattle units and 171 herds. The records corresponded to the period of 1981- 2006. An univariate animal model was used, including as fixed effects the combination herd-year-calving period of four months; calving age, as linear and quadratic covariable, and as random effects the animal, the permanent environment and the residuals, to estimate the heritability and the repeatability of the CI. A bivariate animal model was applied to estimate the genetic and environmental correlation between the CI and the MY305. The estimates of heritability and repeatability for the CI were of 0.06 ± 0.01 and 0.20 ± 0.01, respectively. The phenotypic trend for the CI was of 3.13 ± 1.12 days.year-1 and the genetic trend of -1.53 ± 0.16 days.year-1. The genetic and environmental correlations between the CI and the MY305 were of 0.72 ± 0.06 and 0.01 ± 0.01, respectively. It was concluded that the increase in the phenotypic trend for the CI in the Mambi de Cuba cattle was explained by environmental causes and not by the deterioration in the genetic merit. The correlation between the CI and the MY305 was opposite, thus, the increment in the capacity of milk yield of the cows will reduce the reproductive efficiency of the herd.

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