| Title of Article |
Relationship of the Temperature-Humidity Index (THI) with Ovarian Responses and Embryo Production in Superovulated Thai-Holstein Crossbreds under Tropical Climate Conditions |
| Date of Acceptance |
5 November 2021 |
| Journal |
| Title of Journal |
Veterinary Sciences |
| Standard |
SCOPUS |
| Institute of Journal |
Molecular Diversity Preservation International (MDPI), Switzerland |
| ISBN/ISSN |
|
| Volume |
8 |
| Issue |
|
| Month |
|
| Year of Publication |
2021 |
| Page |
|
| Abstract |
Heat stress strongly negatively affects reproductive traits in dairy cattle. The purpose of the
present study was to investigate the effect of heat stress in superstimulated Thai-Holstein crossbreds
under tropical climate conditions. Data included 75 records from 12 superovulated Thai-Holstein
crossbreds between 2018 and 2020. Cows were superstimulated with conventional treatment. The
mean temperature-humidity index (THI) was evaluated for three data collection periods: during the
9, 21 and 42-day periods before the insemination day to determine the period in which THI mostly
affected superstimulation responses. The THI levels/thresholds were determined and interpreted
together with the superovulatory response. A significantly negative correlation was obtained for the
THI during the period 9 days before insemination. Negative effects on the number of large follicles
and corpora lutea began at a THI of 72 and were apparently severe after a THI of 77, similar to the
ovulation rate, fertilized ova and transferable embryos (p < 0.05). Meanwhile, more degenerated
embryos were found with THI values (p < 0.05). The superovulatory response in Thai-Holstein
crossbreds under tropical climate conditions is highly affected by heat stress starting at a THI of 72
and becomes more severe at a THI higher than 77. |
| Keyword |
heat stress; superovulation; threshold point |
| Author |
|
| Reviewing Status |
มีผู้ประเมินอิสระ |
| Status |
ตีพิมพ์แล้ว |
| Level of Publication |
นานาชาติ |
| citation |
false |
| Part of thesis |
true |
| Attach file |
|
| Citation |
0
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Publication
Journal Publication
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