Effect of increasing energy levels of diet and heat synchronization on steroid hormones and reproductive indices in Holstein heifers
The aim of the present study was to determine the effects of increasing energy levels of diet and heat synchronization on steroid hormones and fertility in Holstein heifers. Eighty heifers with average bodyweight of 330±20 kg were randomly allocated in equal numbers into four groups including contro...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | fas |
| Published: |
Islamic Azad University, Tabriz Branch
2013-08-01
|
| Series: | Āsīb/shināsī-i Darmāngāhī-i Dāmpizishkī |
| Subjects: | |
| Online Access: | http://jvcp.iaut.ac.ir/article_517266_dae85790edec9959e423e675a1534fd1.pdf |
| _version_ | 1818365055508414464 |
|---|---|
| author | akbar pirestani amirabbas emamimeybodi gholamreza ghalamkari shahin eghbalsaeediaboueshaghi |
| author_facet | akbar pirestani amirabbas emamimeybodi gholamreza ghalamkari shahin eghbalsaeediaboueshaghi |
| author_sort | akbar pirestani |
| collection | DOAJ |
| description | The aim of the present study was to determine the effects of increasing energy levels of diet and heat synchronization on steroid hormones and fertility in Holstein heifers. Eighty heifers with average bodyweight of 330±20 kg were randomly allocated in equal numbers into four groups including control (A), high energy diet (B) (10% higher than NRC recommendation), heat synchronization (C) (CIDR-Ovsynch) and high energy diet + heat synchronization (D). Heifers in groups B and D were fed initially one year and 30-day pre-synchronization periods, and they were inseminated after observation of heat. Blood samples were collected after first heat signs (groups A & B) and at the beginning of synchronization in each phase of estrus cycle for the determination of plasma progesterone, estrogen and BHBA concentrations. Also, reproduction indices such as service per conception rate and intervals between first heat and AI leading to pregnancy were evaluated. The results showed that estrogen level was significantly increased (p |
| first_indexed | 2024-12-13T22:14:11Z |
| format | Article |
| id | doaj.art-270fd2c6cf944850a25aa1960e35d9a2 |
| institution | Directory Open Access Journal |
| issn | 2322-4746 2476-6984 |
| language | fas |
| last_indexed | 2024-12-13T22:14:11Z |
| publishDate | 2013-08-01 |
| publisher | Islamic Azad University, Tabriz Branch |
| record_format | Article |
| series | Āsīb/shināsī-i Darmāngāhī-i Dāmpizishkī |
| spelling | doaj.art-270fd2c6cf944850a25aa1960e35d9a22022-12-21T23:29:38ZfasIslamic Azad University, Tabriz BranchĀsīb/shināsī-i Darmāngāhī-i Dāmpizishkī2322-47462476-69842013-08-0172 (26) تابستان18561872517266Effect of increasing energy levels of diet and heat synchronization on steroid hormones and reproductive indices in Holstein heifersakbar pirestani0amirabbas emamimeybodi1gholamreza ghalamkari2shahin eghbalsaeediaboueshaghi3دانشگاه آزاد اسلامی، واحد خوراسگان (اصفهان)، استادیار گروه علوم دامی، دانشکده کشاورزی، اصفهان، ایران.دانشگاه آزاد اسلامی، واحد خوراسگان (اصفهان)، دانش‌آموخته گروه علوم دامی، دانشکده کشاورزی، اصفهان، ایران.دانشگاه آزاد اسلامی، واحد خوراسگان (اصفهان)، استادیار گروه علوم دامی، دانشکده کشاورزی، اصفهان، ایران.دانشگاه آزاد اسلامی، واحد خوراسگان (اصفهان)، استادیار گروه علوم دامی، دانشکده کشاورزی، اصفهان، ایران.The aim of the present study was to determine the effects of increasing energy levels of diet and heat synchronization on steroid hormones and fertility in Holstein heifers. Eighty heifers with average bodyweight of 330±20 kg were randomly allocated in equal numbers into four groups including control (A), high energy diet (B) (10% higher than NRC recommendation), heat synchronization (C) (CIDR-Ovsynch) and high energy diet + heat synchronization (D). Heifers in groups B and D were fed initially one year and 30-day pre-synchronization periods, and they were inseminated after observation of heat. Blood samples were collected after first heat signs (groups A & B) and at the beginning of synchronization in each phase of estrus cycle for the determination of plasma progesterone, estrogen and BHBA concentrations. Also, reproduction indices such as service per conception rate and intervals between first heat and AI leading to pregnancy were evaluated. The results showed that estrogen level was significantly increased (phttp://jvcp.iaut.ac.ir/article_517266_dae85790edec9959e423e675a1534fd1.pdfdietEnergyReproduction indicesSteroid Hormoneheifers |
| spellingShingle | akbar pirestani amirabbas emamimeybodi gholamreza ghalamkari shahin eghbalsaeediaboueshaghi Effect of increasing energy levels of diet and heat synchronization on steroid hormones and reproductive indices in Holstein heifers Āsīb/shināsī-i Darmāngāhī-i Dāmpizishkī diet Energy Reproduction indices Steroid Hormone heifers |
| title | Effect of increasing energy levels of diet and heat synchronization on steroid hormones and reproductive indices in Holstein heifers |
| title_full | Effect of increasing energy levels of diet and heat synchronization on steroid hormones and reproductive indices in Holstein heifers |
| title_fullStr | Effect of increasing energy levels of diet and heat synchronization on steroid hormones and reproductive indices in Holstein heifers |
| title_full_unstemmed | Effect of increasing energy levels of diet and heat synchronization on steroid hormones and reproductive indices in Holstein heifers |
| title_short | Effect of increasing energy levels of diet and heat synchronization on steroid hormones and reproductive indices in Holstein heifers |
| title_sort | effect of increasing energy levels of diet and heat synchronization on steroid hormones and reproductive indices in holstein heifers |
| topic | diet Energy Reproduction indices Steroid Hormone heifers |
| url | http://jvcp.iaut.ac.ir/article_517266_dae85790edec9959e423e675a1534fd1.pdf |
| work_keys_str_mv | AT akbarpirestani effectofincreasingenergylevelsofdietandheatsynchronizationonsteroidhormonesandreproductiveindicesinholsteinheifers AT amirabbasemamimeybodi effectofincreasingenergylevelsofdietandheatsynchronizationonsteroidhormonesandreproductiveindicesinholsteinheifers AT gholamrezaghalamkari effectofincreasingenergylevelsofdietandheatsynchronizationonsteroidhormonesandreproductiveindicesinholsteinheifers AT shahineghbalsaeediaboueshaghi effectofincreasingenergylevelsofdietandheatsynchronizationonsteroidhormonesandreproductiveindicesinholsteinheifers |