Genomic selection in Gir cattle using female reference population
When a sizeable reference population of proven bulls is not available for implementing Genomic selection for a particular trait, and when a recording of certain traits on large scale is difficult, the use of a female reference population is recommended. Gir, one of the important milk purpose cattle...
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| Format: | Article |
| Language: | English |
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Indian Council of Agricultural Research
2021-07-01
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| Series: | Indian Journal of Animal Sciences |
| Subjects: | |
| Online Access: | https://epubs.icar.org.in/index.php/IJAnS/article/view/113193 |
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| author | NILESH NAYEE SWAPNIL GAJJAR A SUDHAKAR SUJIT SAHA KAMLESH TRIVEDI PRAVIN VATALIYA |
| author_facet | NILESH NAYEE SWAPNIL GAJJAR A SUDHAKAR SUJIT SAHA KAMLESH TRIVEDI PRAVIN VATALIYA |
| author_sort | NILESH NAYEE |
| collection | DOAJ |
| description |
When a sizeable reference population of proven bulls is not available for implementing Genomic selection for a particular trait, and when a recording of certain traits on large scale is difficult, the use of a female reference population is recommended. Gir, one of the important milk purpose cattle breeds of India falls under this category. There is no large scale Progeny Testing (PT) programme in Gir, so proven bulls based on daughter performance in large numbers are not available. Considering the constraints, a genomic BLUP (GBLUP) model was implemented based on recorded cow reference population in Gir breed. Cows (3491) and 23 bulls were genotyped using INDUSCHIP for this purpose. Due to non-availability of pedigreed data, conventional breeding values (BV) of bulls and their reliabilities were not known. For comparison, assumed theoretical reliability of BV of a bull selected based on its dam's yield was compared with reliability obtained for genomic breeding value (GBV) using a GBLUP model. The reliability estimates for GBVs were 4 times higher than that for BVs. The predictive ability of the model was demonstrated by measuring the correlation between corrected phenotypes and GBVs for animals whose records were masked in a five-fold cross-validation study. The correlation was around 0.45 showing reasonable predictability of the GBLUP model. The GBVs were not biased. The regression coefficient between the corrected phenotype and GBV was 1.045. The present study demonstrates that it is feasible to implement genomic selection in Gir cattle in Indian conditions using a female reference population. It is expected that the bulls can be selected with around 4 fold more accuracy than the current method of selecting based on their dams' yield accelerating expected genetic growth in Gir cattle.
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| first_indexed | 2024-04-10T07:50:38Z |
| format | Article |
| id | doaj.art-22296e401b404f60877ca58317ccd20a |
| institution | Directory Open Access Journal |
| issn | 0367-8318 2394-3327 |
| language | English |
| last_indexed | 2024-04-10T07:50:38Z |
| publishDate | 2021-07-01 |
| publisher | Indian Council of Agricultural Research |
| record_format | Article |
| series | Indian Journal of Animal Sciences |
| spelling | doaj.art-22296e401b404f60877ca58317ccd20a2023-02-23T10:16:35ZengIndian Council of Agricultural ResearchIndian Journal of Animal Sciences0367-83182394-33272021-07-01901210.56093/ijans.v90i12.113193Genomic selection in Gir cattle using female reference populationNILESH NAYEE0SWAPNIL GAJJAR1A SUDHAKAR2SUJIT SAHA3KAMLESH TRIVEDI4PRAVIN VATALIYA5National Dairy Development Board, Anand, Gujarat 388 001 IndiaKamdhenu University, Gandhinagar, Gujarat, IndiaNational Dairy Development Board, Anand, Gujarat 388 001 IndiaNational Dairy Development Board, Anand, Gujarat 388 001 IndiaNational Dairy Development Board, Anand, Gujarat 388 001 IndiaNational Dairy Development Board, Anand, Gujarat 388 001 India When a sizeable reference population of proven bulls is not available for implementing Genomic selection for a particular trait, and when a recording of certain traits on large scale is difficult, the use of a female reference population is recommended. Gir, one of the important milk purpose cattle breeds of India falls under this category. There is no large scale Progeny Testing (PT) programme in Gir, so proven bulls based on daughter performance in large numbers are not available. Considering the constraints, a genomic BLUP (GBLUP) model was implemented based on recorded cow reference population in Gir breed. Cows (3491) and 23 bulls were genotyped using INDUSCHIP for this purpose. Due to non-availability of pedigreed data, conventional breeding values (BV) of bulls and their reliabilities were not known. For comparison, assumed theoretical reliability of BV of a bull selected based on its dam's yield was compared with reliability obtained for genomic breeding value (GBV) using a GBLUP model. The reliability estimates for GBVs were 4 times higher than that for BVs. The predictive ability of the model was demonstrated by measuring the correlation between corrected phenotypes and GBVs for animals whose records were masked in a five-fold cross-validation study. The correlation was around 0.45 showing reasonable predictability of the GBLUP model. The GBVs were not biased. The regression coefficient between the corrected phenotype and GBV was 1.045. The present study demonstrates that it is feasible to implement genomic selection in Gir cattle in Indian conditions using a female reference population. It is expected that the bulls can be selected with around 4 fold more accuracy than the current method of selecting based on their dams' yield accelerating expected genetic growth in Gir cattle. https://epubs.icar.org.in/index.php/IJAnS/article/view/113193Female reference populationGenomic selectionGir |
| spellingShingle | NILESH NAYEE SWAPNIL GAJJAR A SUDHAKAR SUJIT SAHA KAMLESH TRIVEDI PRAVIN VATALIYA Genomic selection in Gir cattle using female reference population Indian Journal of Animal Sciences Female reference population Genomic selection Gir |
| title | Genomic selection in Gir cattle using female reference population |
| title_full | Genomic selection in Gir cattle using female reference population |
| title_fullStr | Genomic selection in Gir cattle using female reference population |
| title_full_unstemmed | Genomic selection in Gir cattle using female reference population |
| title_short | Genomic selection in Gir cattle using female reference population |
| title_sort | genomic selection in gir cattle using female reference population |
| topic | Female reference population Genomic selection Gir |
| url | https://epubs.icar.org.in/index.php/IJAnS/article/view/113193 |
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