Estimation and use of repeatability and heritability coefficients of productivity traits in breeding dairy cattle

Zavertyaev, B. P.; Прожерин, В П

doi:10.3103/s1068367408020134

Cited by 2 publications

(2 citation statements)

References 3 publications

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“…During the formation of monozygotic twins, one zygote is divided into two or more embryos (polyembryony process) [5][6][7]. If cattle are characterized by a low frequency of twinning -on average 0.025, then the probability of identical twins does not exceed 0.01% [4,[8][9][10][11][12]. According to various data, the proportion of monozygotic twins among same-sex couples reaches 5% and 10% of all twins.…”

Section: Introductionmentioning

confidence: 99%

“…The experiment led to a 75% pregnancy rate, Similar studies on the separation of preimplantation embryos were conducted by scientists of the former USSR. Thus, in the All-Union Research Institute of Animal Husbandry (Dubrovitsy, Moscow region), the engraftability of demiembrions without a pellucid zone, depending on the stage of development and the separation of embryos, ranged from 21.7 to 66.7% [9,10], in the Lithuanian Veterinary Academy from 44.4 to 66.6% [6].In Ukraine, in farm conditions, pregnancy was obtained from transplanting 48 demiembryons in 22 recipients (45.8%) [5].…”

Section: Introductionmentioning

confidence: 99%

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Microsurgical dissection methods for embryonic cloning of monozygotic twins

Babenkov,

Chimidova,

Ubushieva

et al. 2024

BIO Web Conf.

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To date, biotechnological methods for producing double grains play an important role in increasing the production of milk and meat. At the same time, monozygotic twins are of particular interest for assessing the heritability of quantitative traits, breeding value when studying the influence of the maternal effect on offspring and creating reserve genes with known properties. However, in cattle, the frequency of birth of twins is only 0.025%, and the appearance of identical twins is only 0.01%. The reasons for the separation of embryos in the process of ontogenesis are unknown, but their production became possible with the development of genetic engineering methods, which include embryonic cloning by microsurgery of early embryos (dissection). The results of research in this area are mostly not applied, which is due to the high cost of micromanipulation equipment and the complexity of the procedure due to the large number of micro-tools. Today, the development of simplified methods of microsurgical manipulations on embryos remains an urgent task. In this regard, the aim of the research was to study the possibility of simplifying the existing technology of microsurgical dissection of preimplantation embryos by developing appropriate tools. In connection with this goal, the tasks of developing a device for simplifying the dissection procedure and determining its effectiveness in comparison with the use of a micromanipulator with one tool were determined. The development of the device and its practical application were carried out in 2021-2023 at the Regional Research and Production Center for the Reproduction of Farm Animals of the Kalmyk State University named after B.B. Gorodovikov. The conducted studies showed the following results: the efficiency of using a micromanipulator with one microscalpel was 86.1%: as a result of dissection of 61 embryos, 105 full-fledged demiembryons out of 122 possible ones were obtained. The efficiency of the developed device was 10.2% higher – after separation, 27 embryos received 52 compacted demiembryons out of 54 possible (96.3%).

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microsurgical dissection methods for embryonic cloning of monozygotic twins

Babenkov,

Chimidova,

Ubushieva

et al. 2024

BIO Web Conf.

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Estimación de parámetros genéticos para la producción de leche en lactancias de vacas Mambí de Cuba

Hernández¹,

León²,

Guerra

et al. 2011

Arch. zootec.

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PALABRAS CLAVE ADICIONALESVacuno autóctono. ADDITIONAL KEYWORDSLocal cattle. RESUMENSe utilizaron 25 036 registros de producción de leche acumulada hasta 305 días (13 495 de primera lactancia (L1), 6067 de la segunda (L2), 3445 de la tercera (L3) y 2029 de la cuarta (L4), respectivamente) pertenecientes a 13 495 vacas Mambí de Cuba (¾ Holstein ¼ Cebú) que parieron entre los años 1981-2006, distribuidas en 173 rebaños de 4 empresas ganaderas. El objetivo de este estudio fue estimar las heredabilidades y correlaciones genéticas entre las cuatro primeras lactancias (L1-L4) y determinar si la primera lactancia podría ser considerada como criterio de selección de vacas y sementales de esta raza. Para estimar los componentes de (co) varianza y parámetros genéticos se utilizó el programa REMLF90 empleando un modelo animal multivariado que incluyó como efecto fijo el grupo de contemporáneos (rebaño-año-cuatrimestre de parto), la edad al parto como covariable lineal y cuadrática, y como efectos aleatorios el animal y el error. Los promedios para L1 hasta L4 fueron de: 1957 kg, 2086 kg, 2099 kg y 2106 kg, y los valores de heredabilidad fueron 0,22 ± 0,03; 0,17 ± 0,04; 0,22 ± 0,05 y 0,26 ± 0,06, respectivamente. Las correlaciones genéticas entre las cuatro primeras lactancias fueron altas con valores entre 0,76 y 0,95. Se concluye que es posible obtener ganancias genéticas mediante selección por producción de leche; que hubo un alto porcentaje de genes en común que influyeron en las diferentes lactancias, y que la producción lechera en la primera lactancia es un buen indicador del comportamiento productivo de las vacas Mambí de Cuba, que puede ser utilizada como criterio de selección. SUMMARYThe 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 (¾ Holstein ¼ 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,

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Estimation and use of repeatability and heritability coefficients of productivity traits in breeding dairy cattle

Cited by 2 publications

References 3 publications

Microsurgical dissection methods for embryonic cloning of monozygotic twins

Microsurgical dissection methods for embryonic cloning of monozygotic twins

Estimación de parámetros genéticos para la producción de leche en lactancias de vacas Mambí de Cuba

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