Impact of maternal heat stress at insemination on the subsequent reproductive performance of Holstein, Brown Swiss, and their crosses

Theriogenology
Mahmoud S El-Tarabany, Akram A El-Tarabany

Abstract

Heat stress in hot environments is one of the major factors that can negatively affect milk production, reproduction, and the health of dairy cows. The aim of this study was to evaluate the impact of maternal heat stress at insemination on the subsequent reproductive performance of the pure Holstein (HO), Brown Swiss (BS), and their F1 crossbred (BF) cows, under subtropical Egyptian conditions. The influence of temperature-humidity index (THI) on the pregnancy rate, fetal loss rate, calving traits, and reproductive indices were investigated. Fetal loss rate of pure HO was significantly increased from 17.1% at low THI to 24.9% at greater THI (odds ratio = 2.09; P = 0.032). Furthermore, abortion and stillbirth rates of pure HO were significantly increased from 3.6% and 3.8%, respectively, at low THI to 7.2% and 5.9%, respectively, at greater THI (odds ratio = 2.17 and 2.58; P = 0.037 and 0.031, respectively). In contrast, BS and BF cows can tolerate the heat stress, as there were no differences in the fetal loss, abortion, and calving difficulty rates at the different levels of THI. Pure HO cows had a significant longer calving interval and days open at high THI (449 and 173 days, respectively), compared with low THI (421 and 146...Continue Reading

References

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Apr 17, 2010·Reproduction : the Official Journal of the Society for the Study of Fertility·M GendelmanZ Roth
Nov 29, 2011·Journal of Dairy Science·S TaoG E Dahl

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Citations

Aug 25, 2015·Animal Reproduction Science·Mahmoud S El-Tarabany, Akram A El-Tarabany
Oct 23, 2016·Theriogenology·Mahmoud S El-TarabanyElshimaa M Roushdy
Nov 24, 2019·Tropical Animal Health and Production·A L L CordeiroF C Landim-Alvarenga

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