Study of the genetic structure of the Holando Uruguayan breed using genetic markers: Intra-racial comparison
A total of 354 blood samples were collected from Holstein Friesian cattle in Uruguay, distributed as follows: 138 cows, 42 bulls and 177 calves. Blood groups were determined by using 39 reagents from 8 systems (A, B, C, F, J, L, S, Z). In order to evaluate the degree of genetics variability in our sample, the average Heterozygosity was calculated. On the other hand, the average Heterozygosity was higher in cows than in calves, that together with a diminished nimber of alleles in B locus for progeny, points out a fall in genetic variability in the next generation. The significance of differences between the obtained and expected values of genotypic frequencies found in the progeny for systems J and Z seem to be caused by a limited number of sires rather than by other factors effecting the changes in gene frequencies. Nei's measures of normalized genetic identity and standard genetic distance between two populations were calculated for populations from Uruguay and USA over 7 loci. Those measures show that HF populations from the USA and Uruguay are the closest ones. Summing up all the results, we conclude that there is a decreaase in the genetic variability of the Uruguayan HF progeny generation and a high similarity between HF populations from the USA and Uruguay.
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Sociedad de Medicina Veterinaria del Uruguay (SMVU)
2002
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rev-smvu-uy-article-4422020-07-27T20:16:44Z Study of the genetic structure of the Holando Uruguayan breed using genetic markers: Intra-racial comparison Estudio de la estructura genética de la raza Holando Uruguayo mediante marcadores genéticos: Comparación intra-racial Kelly, E. L. Mortari, N. Andrés, D. De Postoglioni, A. Grupos sanguíneos Diversidad bovina Holando Uruguayo Blood groups Diversity cattle Holstein-Fresian-Uruguay A total of 354 blood samples were collected from Holstein Friesian cattle in Uruguay, distributed as follows: 138 cows, 42 bulls and 177 calves. Blood groups were determined by using 39 reagents from 8 systems (A, B, C, F, J, L, S, Z). In order to evaluate the degree of genetics variability in our sample, the average Heterozygosity was calculated. On the other hand, the average Heterozygosity was higher in cows than in calves, that together with a diminished nimber of alleles in B locus for progeny, points out a fall in genetic variability in the next generation. The significance of differences between the obtained and expected values of genotypic frequencies found in the progeny for systems J and Z seem to be caused by a limited number of sires rather than by other factors effecting the changes in gene frequencies. Nei's measures of normalized genetic identity and standard genetic distance between two populations were calculated for populations from Uruguay and USA over 7 loci. Those measures show that HF populations from the USA and Uruguay are the closest ones. Summing up all the results, we conclude that there is a decreaase in the genetic variability of the Uruguayan HF progeny generation and a high similarity between HF populations from the USA and Uruguay. El estudio de la estructura genética de la raza Holando Uruguayo (HU) se realiza en una muestra de 357 animales, correspondiendo 138 a madres, 42 padres y sus 177 crías. Se testan 8 sistemas de grupos sanguíneos (A, B, C, F, J, L, S, Z), obteniéndose un menor número de alelos del sistema B en las crías. Para evaluar la variabilidad de nuestra población se calcula el índice de heterocigosidad medio (IH). Se demuestra que esta es mayor en las madres que en las crías. Se comparan las frecuencias genotípicas observadas en la generación filial con las frecuencias esperadas de acuerdo al cruzamiento al azar entre los padres y las madres para los sistemas A, F, J, L y Z. Los sistemas J y Z presentaron un X² significativo, siendo sus posibles causas el efecto producido por el uso de pocos padres con un gran número de crías. Se calcula la distancia genética (DG) e identidad (genética) de Nei entre una muestra de HU y la población de Holstein-Friesian (HF) de USA, por ser su principal ancestro. Esta se estima a partir de la frecuencia genética de los 7 sistemas, siendo la identidad promedio entre HU y HF de USA muy alta (0,9807). En relación a los marcadores analizados, se concluye que existiría una disminución de la variabilidad genética en la siguiente generacion y una gran similitud entre las poblaciones de HF de USA y Uruguay. Sociedad de Medicina Veterinaria del Uruguay (SMVU) 2002-09-01 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed article. Artículo evaluado por pares. Artigo revisado por pares. application/pdf https://www.revistasmvu.com.uy/index.php/smvu/article/view/442 Veterinaria (Montevideo); Vol. 37 No. 147 - 148 (2002): April - September; 7-13 Veterinaria (Montevideo); Vol. 37 Núm. 147 - 148 (2002): Abril - Setiembre; 7-13 Veterinaria (Montevideo); v. 37 n. 147 - 148 (2002): Abril - Setembro; 7-13 1688-4809 0376-4362 spa https://www.revistasmvu.com.uy/index.php/smvu/article/view/442/291 Derechos de autor 2002 Sociedad de Medicina Veterinaria del Uruguay |
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Digital |
| author |
Kelly, E. L. Mortari, N. Andrés, D. De Postoglioni, A. |
| spellingShingle |
Kelly, E. L. Mortari, N. Andrés, D. De Postoglioni, A. Study of the genetic structure of the Holando Uruguayan breed using genetic markers: Intra-racial comparison |
| author_facet |
Kelly, E. L. Mortari, N. Andrés, D. De Postoglioni, A. |
| author_sort |
Kelly, E. L. |
| title |
Study of the genetic structure of the Holando Uruguayan breed using genetic markers: Intra-racial comparison |
| title_short |
Study of the genetic structure of the Holando Uruguayan breed using genetic markers: Intra-racial comparison |
| title_full |
Study of the genetic structure of the Holando Uruguayan breed using genetic markers: Intra-racial comparison |
| title_fullStr |
Study of the genetic structure of the Holando Uruguayan breed using genetic markers: Intra-racial comparison |
| title_full_unstemmed |
Study of the genetic structure of the Holando Uruguayan breed using genetic markers: Intra-racial comparison |
| title_sort |
study of the genetic structure of the holando uruguayan breed using genetic markers: intra-racial comparison |
| description |
A total of 354 blood samples were collected from Holstein Friesian cattle in Uruguay, distributed as follows: 138 cows, 42 bulls and 177 calves. Blood groups were determined by using 39 reagents from 8 systems (A, B, C, F, J, L, S, Z). In order to evaluate the degree of genetics variability in our sample, the average Heterozygosity was calculated. On the other hand, the average Heterozygosity was higher in cows than in calves, that together with a diminished nimber of alleles in B locus for progeny, points out a fall in genetic variability in the next generation. The significance of differences between the obtained and expected values of genotypic frequencies found in the progeny for systems J and Z seem to be caused by a limited number of sires rather than by other factors effecting the changes in gene frequencies. Nei's measures of normalized genetic identity and standard genetic distance between two populations were calculated for populations from Uruguay and USA over 7 loci. Those measures show that HF populations from the USA and Uruguay are the closest ones. Summing up all the results, we conclude that there is a decreaase in the genetic variability of the Uruguayan HF progeny generation and a high similarity between HF populations from the USA and Uruguay. |
| publisher |
Sociedad de Medicina Veterinaria del Uruguay (SMVU) |
| publishDate |
2002 |
| url |
https://www.revistasmvu.com.uy/index.php/smvu/article/view/442 |
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