Effect of variable interservice interval on conception in crossbred cows
Reducing number of services per conception holds the key for profitable dairying. The widely considered estrous cycle length of 21 d has been refuted, a change that can seriously implicate fertility. The present investigation evaluated association amongst interservice interval (ISI, the period inte...
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| Format: | Article |
| Language: | English |
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Indian Council of Agricultural Research
2021-01-01
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| Series: | Indian Journal of Animal Sciences |
| Subjects: | |
| Online Access: | https://epubs.icar.org.in/index.php/IJAnS/article/view/109449 |
| _version_ | 1828005953438482432 |
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| author | PANKAJ SOOD H D SARMA P K DOGRA VARUN SANKYAN |
| author_facet | PANKAJ SOOD H D SARMA P K DOGRA VARUN SANKYAN |
| author_sort | PANKAJ SOOD |
| collection | DOAJ |
| description |
Reducing number of services per conception holds the key for profitable dairying. The widely considered estrous cycle length of 21 d has been refuted, a change that can seriously implicate fertility. The present investigation evaluated association amongst interservice interval (ISI, the period intervening two successive inseminations) and services per conception alongwith certain cow related variables (age, lactation number, days in milk to AI, days in milk at conception, age at conception and 305 d lactation yield). Data on 768 ISIs (range: 17 to 24 d) from 1,479 AIs (600 in normal; 879 in repeat breeders) in 193 lactating Jersey crossbred cows conceiving to different number of inseminations, was utilized. The ISI data in form of average, immediately prior to conception and pattern (regular – if ISI between AIs was of same duration; irregular – if ISI between AIs was of different durations) was considered for analysis. Nearly 84% of ISI ranged from 19 to 22 d, merely 22.6% being of 21 d (overall average of 20.3±0.44 d). Correlation matrix revealed a solitary, significant and negative relation of ISI, both average and prior to conception, with services per conception. The ISI of ≥21 d culminated consistently into more number of pregnant cows as well as lesser services per conception. The forward selection regression model predicted reduction in ISI by 0.17 d with each additional insemination. Irregular pattern of ISI was also unfavourable for conception. The probable mechanisms for variable ISI in light of conception have been exhaustively elaborated, which could pave potential future studies aiming reduced reproductive wastage.
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| first_indexed | 2024-04-10T07:49:51Z |
| format | Article |
| id | doaj.art-63ec11e0e1e9436087a2a07a0bee49dc |
| institution | Directory Open Access Journal |
| issn | 0367-8318 2394-3327 |
| language | English |
| last_indexed | 2024-04-10T07:49:51Z |
| publishDate | 2021-01-01 |
| publisher | Indian Council of Agricultural Research |
| record_format | Article |
| series | Indian Journal of Animal Sciences |
| spelling | doaj.art-63ec11e0e1e9436087a2a07a0bee49dc2023-02-23T10:20:59ZengIndian Council of Agricultural ResearchIndian Journal of Animal Sciences0367-83182394-33272021-01-0190910.56093/ijans.v90i9.109449Effect of variable interservice interval on conception in crossbred cowsPANKAJ SOOD0H D SARMA1P K DOGRA2VARUN SANKYAN3DGCN College of Veterinary and Animal Sciences, Palampur, Himachal Pradesh 176 062Animal Facility and Radioisotope Laboratory Radiation Biology and Health Sciences Division, Bhabha Atomic Research Centre, Mumbai 400 085College of Veterinary and Animal Sciences, CSK HPKV, Palampur, Himachal Pradesh 176 062 IndiaCollege of Veterinary and Animal Sciences, CSK HPKV, Palampur, Himachal Pradesh 176 062 India Reducing number of services per conception holds the key for profitable dairying. The widely considered estrous cycle length of 21 d has been refuted, a change that can seriously implicate fertility. The present investigation evaluated association amongst interservice interval (ISI, the period intervening two successive inseminations) and services per conception alongwith certain cow related variables (age, lactation number, days in milk to AI, days in milk at conception, age at conception and 305 d lactation yield). Data on 768 ISIs (range: 17 to 24 d) from 1,479 AIs (600 in normal; 879 in repeat breeders) in 193 lactating Jersey crossbred cows conceiving to different number of inseminations, was utilized. The ISI data in form of average, immediately prior to conception and pattern (regular – if ISI between AIs was of same duration; irregular – if ISI between AIs was of different durations) was considered for analysis. Nearly 84% of ISI ranged from 19 to 22 d, merely 22.6% being of 21 d (overall average of 20.3±0.44 d). Correlation matrix revealed a solitary, significant and negative relation of ISI, both average and prior to conception, with services per conception. The ISI of ≥21 d culminated consistently into more number of pregnant cows as well as lesser services per conception. The forward selection regression model predicted reduction in ISI by 0.17 d with each additional insemination. Irregular pattern of ISI was also unfavourable for conception. The probable mechanisms for variable ISI in light of conception have been exhaustively elaborated, which could pave potential future studies aiming reduced reproductive wastage. https://epubs.icar.org.in/index.php/IJAnS/article/view/109449ConceptionCrossbred cowsInterservice interval |
| spellingShingle | PANKAJ SOOD H D SARMA P K DOGRA VARUN SANKYAN Effect of variable interservice interval on conception in crossbred cows Indian Journal of Animal Sciences Conception Crossbred cows Interservice interval |
| title | Effect of variable interservice interval on conception in crossbred cows |
| title_full | Effect of variable interservice interval on conception in crossbred cows |
| title_fullStr | Effect of variable interservice interval on conception in crossbred cows |
| title_full_unstemmed | Effect of variable interservice interval on conception in crossbred cows |
| title_short | Effect of variable interservice interval on conception in crossbred cows |
| title_sort | effect of variable interservice interval on conception in crossbred cows |
| topic | Conception Crossbred cows Interservice interval |
| url | https://epubs.icar.org.in/index.php/IJAnS/article/view/109449 |
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