Evaluation of reproductive traits of Chokla sheep under semi-arid conditions of Rajasthan
The study analysed the records of 1,172 ewes maintained at ICAR–Central Sheep and Wool Research Institute at Avikanagar and Bikaner, Rajasthan over a period of 22 years (1994-2016). Eight reproductive traits were assessed, namely age at first service (AFS; 572.39±6.59 days), age at first successf...
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| Format: | Article |
| Language: | English |
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Indian Council of Agricultural Research
2019-09-01
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| Series: | Indian Journal of Animal Sciences |
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| Online Access: | https://epubs.icar.org.in/index.php/IJAnS/article/view/93787 |
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| author | ARNAV MEHROTRA URMILA PANNU ASHISH CHOPRA H K NARULA A K PATEL |
| author_facet | ARNAV MEHROTRA URMILA PANNU ASHISH CHOPRA H K NARULA A K PATEL |
| author_sort | ARNAV MEHROTRA |
| collection | DOAJ |
| description | The study analysed the records of 1,172 ewes maintained at ICAR–Central Sheep and Wool Research Institute at Avikanagar and Bikaner, Rajasthan over a period of 22 years (1994-2016). Eight reproductive traits were assessed, namely age at first service (AFS; 572.39±6.59 days), age at first successful service (ASS; 635.71±9.36 days), age at first lambing (AFL; 773±8.77 days), weight at first service (WFS; 25.16±0.11 kg), weight at first successful service (WSS; 25.85±0.16 kg), weight at lambing (WL; 28.61±0.21 kg), lambing interval (LI;371±6.87days) and service period (SP; 228.31±6.62 days). The effects of period of birth of ewe, ewe’s birth weight and sire were significant for all the traits except LI and SP with an improvement of 17.47% –37.6% observed over the period of study. Season of birth of ewe had significant effect on AFL. AFS, ASS and AFL were significantly influenced by their respective covariates (WFS, WSS and WL). The statistically significant improvement over the periods suggest that through suitable selective breeding policy and good managemental measures, the reproductive performance of the flock can be enhanced. The optimization of ewe weights could reduce the age of sexual maturity and the ewe’s weight at birth may serve as an indicator for future performance in this regard. Selection of superior sires may improve the genetic potential of the flock with respect to the reproductive traits. |
| first_indexed | 2024-04-10T07:46:48Z |
| format | Article |
| id | doaj.art-90a0e6318aee4e1d947ac669d6e7817e |
| institution | Directory Open Access Journal |
| issn | 0367-8318 2394-3327 |
| language | English |
| last_indexed | 2024-04-10T07:46:48Z |
| publishDate | 2019-09-01 |
| publisher | Indian Council of Agricultural Research |
| record_format | Article |
| series | Indian Journal of Animal Sciences |
| spelling | doaj.art-90a0e6318aee4e1d947ac669d6e7817e2023-02-23T10:31:36ZengIndian Council of Agricultural ResearchIndian Journal of Animal Sciences0367-83182394-33272019-09-0189910.56093/ijans.v89i9.93787Evaluation of reproductive traits of Chokla sheep under semi-arid conditions of RajasthanARNAV MEHROTRA0URMILA PANNU1ASHISH CHOPRA2H K NARULA3A K PATEL4PhD Scholar, Division of Animal Genetics and Breeding, ICAR-Indian Veterinary Research Institute, Izatnagar, Uttar PradeshProfessor, ICAR-Indian Veterinary Research Institute, Izatnagar, Uttar PradeshSenior Scientist, ICAR-Indian Veterinary Research Institute, Izatnagar, Uttar PradeshPrincipal Scientist, ICAR-Indian Veterinary Research Institute, Izatnagar, Uttar PradeshPrincipal Scientist, ICAR–Central Arid Zone Research Institute, Jodhpur, Rajasthan.The study analysed the records of 1,172 ewes maintained at ICAR–Central Sheep and Wool Research Institute at Avikanagar and Bikaner, Rajasthan over a period of 22 years (1994-2016). Eight reproductive traits were assessed, namely age at first service (AFS; 572.39±6.59 days), age at first successful service (ASS; 635.71±9.36 days), age at first lambing (AFL; 773±8.77 days), weight at first service (WFS; 25.16±0.11 kg), weight at first successful service (WSS; 25.85±0.16 kg), weight at lambing (WL; 28.61±0.21 kg), lambing interval (LI;371±6.87days) and service period (SP; 228.31±6.62 days). The effects of period of birth of ewe, ewe’s birth weight and sire were significant for all the traits except LI and SP with an improvement of 17.47% –37.6% observed over the period of study. Season of birth of ewe had significant effect on AFL. AFS, ASS and AFL were significantly influenced by their respective covariates (WFS, WSS and WL). The statistically significant improvement over the periods suggest that through suitable selective breeding policy and good managemental measures, the reproductive performance of the flock can be enhanced. The optimization of ewe weights could reduce the age of sexual maturity and the ewe’s weight at birth may serve as an indicator for future performance in this regard. Selection of superior sires may improve the genetic potential of the flock with respect to the reproductive traits.https://epubs.icar.org.in/index.php/IJAnS/article/view/93787Age at first lambingAridChokla sheepRajasthanReproduction |
| spellingShingle | ARNAV MEHROTRA URMILA PANNU ASHISH CHOPRA H K NARULA A K PATEL Evaluation of reproductive traits of Chokla sheep under semi-arid conditions of Rajasthan Indian Journal of Animal Sciences Age at first lambing Arid Chokla sheep Rajasthan Reproduction |
| title | Evaluation of reproductive traits of Chokla sheep under semi-arid conditions of Rajasthan |
| title_full | Evaluation of reproductive traits of Chokla sheep under semi-arid conditions of Rajasthan |
| title_fullStr | Evaluation of reproductive traits of Chokla sheep under semi-arid conditions of Rajasthan |
| title_full_unstemmed | Evaluation of reproductive traits of Chokla sheep under semi-arid conditions of Rajasthan |
| title_short | Evaluation of reproductive traits of Chokla sheep under semi-arid conditions of Rajasthan |
| title_sort | evaluation of reproductive traits of chokla sheep under semi arid conditions of rajasthan |
| topic | Age at first lambing Arid Chokla sheep Rajasthan Reproduction |
| url | https://epubs.icar.org.in/index.php/IJAnS/article/view/93787 |
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