Evaluation of models for estimation of genetic parameters for post-weaning body measurements and their association with yearling weight in Nellore sheep
Objective The objective of this study was to obtain (co) variance components and genetic parameter estimates for post-weaning body measurements such as body length (BL), height at withers (HW), and chest girth (HG) recorded at six (SBL, SHW, and SHG), nine (NBL, NHW, and NHG) and twelve (YBL, YHW, a...
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| Format: | Article |
| Language: | English |
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Asian-Australasian Association of Animal Production Societies
2024-03-01
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| Series: | Animal Bioscience |
| Subjects: | |
| Online Access: | http://www.animbiosci.org/upload/pdf/ab-20-0426.pdf |
| _version_ | 1797272543555485696 |
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| author | Satish Kumar Illa Gangaraju Gollamoori Sapna Nath |
| author_facet | Satish Kumar Illa Gangaraju Gollamoori Sapna Nath |
| author_sort | Satish Kumar Illa |
| collection | DOAJ |
| description | Objective The objective of this study was to obtain (co) variance components and genetic parameter estimates for post-weaning body measurements such as body length (BL), height at withers (HW), and chest girth (HG) recorded at six (SBL, SHW, and SHG), nine (NBL, NHW, and NHG) and twelve (YBL, YHW, and YHG) months of age along with yearling weight (YW) in Nellore sheep maintained at livestock research station, Palamaner, Andhra Pradesh, India and also the association among body measurements with YW was studied. Methods Data on 2,076 Nellore sheep (descended from 75 sires and 522 dams) recorded between 2007 and 2016 (10 years) were utilized in the study. Lambing year, sex of lamb, season of lambing and parity of dam were included in the model as fixed effects and ewe weight was kept as a covariate. Analyses were conducted with six animal models with different combinations of direct and maternal genetic effects using restricted maximum likelihood procedure. Best model for each trait was determined based on Akaike’s information criterion. Results Moderate estimates of direct heritability were obtained for the studied traits viz., BL (0.02 to 0.24), HW (0.31 to 0.49), and CG (0.08 to 0.35) and their corresponding maternal heritability estimates were in the range of 0.00 to 0.07 (BL), 0.13 to 0.17 (HW), and 0.07 to 0.13 (CG), respectively. Positive direct genetic and phenotypic correlations among the traits and they ranged from 0.07 (YBL-YW) to 0.99 (SBL-SHG, SHG-YW, and NBL-YBL) and 0.01 (SBL-YBL) to 0.99 (NBL-NHG), respectively. Further, the genetic correlations among all the body measurements and YW were positive and ranged from 0.07 (YW and YBL) to 0.99 (YW and SHG). Conclusion There was a strong association of chest girth at six months with YW. Further, it is indicated that moderate improvement of post-weaning body measurements in Nellore sheep would be possible through selection. |
| first_indexed | 2024-03-07T14:30:53Z |
| format | Article |
| id | doaj.art-4262e5ef3fe24382ad838d2d18a6f811 |
| institution | Directory Open Access Journal |
| issn | 2765-0189 2765-0235 |
| language | English |
| last_indexed | 2024-03-07T14:30:53Z |
| publishDate | 2024-03-01 |
| publisher | Asian-Australasian Association of Animal Production Societies |
| record_format | Article |
| series | Animal Bioscience |
| spelling | doaj.art-4262e5ef3fe24382ad838d2d18a6f8112024-03-06T05:12:44ZengAsian-Australasian Association of Animal Production SocietiesAnimal Bioscience2765-01892765-02352024-03-0137341942710.5713/ab.20.042625194Evaluation of models for estimation of genetic parameters for post-weaning body measurements and their association with yearling weight in Nellore sheepSatish Kumar Illa0Gangaraju Gollamoori1Sapna Nath2 Livestock Research Station, Sri Venkateswara Veterinary University, Garividi, Andhra Pradesh State 535101, India College of Veterinary Science, Sri Venkateswara Veterinary University, Tirupati, Andhra Pradesh State 517502, India Sri Venkateswara Veterinary University, Livestock Research Station, Garividi, Andhra Pradesh State 535101, IndiaObjective The objective of this study was to obtain (co) variance components and genetic parameter estimates for post-weaning body measurements such as body length (BL), height at withers (HW), and chest girth (HG) recorded at six (SBL, SHW, and SHG), nine (NBL, NHW, and NHG) and twelve (YBL, YHW, and YHG) months of age along with yearling weight (YW) in Nellore sheep maintained at livestock research station, Palamaner, Andhra Pradesh, India and also the association among body measurements with YW was studied. Methods Data on 2,076 Nellore sheep (descended from 75 sires and 522 dams) recorded between 2007 and 2016 (10 years) were utilized in the study. Lambing year, sex of lamb, season of lambing and parity of dam were included in the model as fixed effects and ewe weight was kept as a covariate. Analyses were conducted with six animal models with different combinations of direct and maternal genetic effects using restricted maximum likelihood procedure. Best model for each trait was determined based on Akaike’s information criterion. Results Moderate estimates of direct heritability were obtained for the studied traits viz., BL (0.02 to 0.24), HW (0.31 to 0.49), and CG (0.08 to 0.35) and their corresponding maternal heritability estimates were in the range of 0.00 to 0.07 (BL), 0.13 to 0.17 (HW), and 0.07 to 0.13 (CG), respectively. Positive direct genetic and phenotypic correlations among the traits and they ranged from 0.07 (YBL-YW) to 0.99 (SBL-SHG, SHG-YW, and NBL-YBL) and 0.01 (SBL-YBL) to 0.99 (NBL-NHG), respectively. Further, the genetic correlations among all the body measurements and YW were positive and ranged from 0.07 (YW and YBL) to 0.99 (YW and SHG). Conclusion There was a strong association of chest girth at six months with YW. Further, it is indicated that moderate improvement of post-weaning body measurements in Nellore sheep would be possible through selection.http://www.animbiosci.org/upload/pdf/ab-20-0426.pdfbody measurementsheritabilitynellore sheeprestricted maximum likelihood (reml) |
| spellingShingle | Satish Kumar Illa Gangaraju Gollamoori Sapna Nath Evaluation of models for estimation of genetic parameters for post-weaning body measurements and their association with yearling weight in Nellore sheep Animal Bioscience body measurements heritability nellore sheep restricted maximum likelihood (reml) |
| title | Evaluation of models for estimation of genetic parameters for post-weaning body measurements and their association with yearling weight in Nellore sheep |
| title_full | Evaluation of models for estimation of genetic parameters for post-weaning body measurements and their association with yearling weight in Nellore sheep |
| title_fullStr | Evaluation of models for estimation of genetic parameters for post-weaning body measurements and their association with yearling weight in Nellore sheep |
| title_full_unstemmed | Evaluation of models for estimation of genetic parameters for post-weaning body measurements and their association with yearling weight in Nellore sheep |
| title_short | Evaluation of models for estimation of genetic parameters for post-weaning body measurements and their association with yearling weight in Nellore sheep |
| title_sort | evaluation of models for estimation of genetic parameters for post weaning body measurements and their association with yearling weight in nellore sheep |
| topic | body measurements heritability nellore sheep restricted maximum likelihood (reml) |
| url | http://www.animbiosci.org/upload/pdf/ab-20-0426.pdf |
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