Non-Genetic Factors Affecting Stillbirth and its Effects on Longevity, Production, and Reproductive Performance in Holstein Cows of Iran
Publish place: Iran Agricultural Research، Vol: 30، Issue: 1
Publish Year: 1390
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_IAR-30-1_007
تاریخ نمایه سازی: 19 مهر 1402
Abstract:
The aim of this study was to determine the factors affecting stillbirth and the consequences of stillbirth on longevity, production, and reproductive performance in Holstein cows of Iran. Calving records from March ۲۰۰۰ to April ۲۰۰۹ comprising of ۲۲۰,۰۴۳ calvings on ۱۰۲,۱۹۹ cows in ۳۳ herds were used. The results showed that ۴.۰۶% of the newborn calves died within ۴۸ h of birth. The stillbirth rate was significantly higher for first parity cows (Pvs. ۴۰۵.۵ (±۱.۰۵) d (P<۰.۰۱), respectively]. The overall mean longevity was affected by stillbirth while the shortest lifetime was observed for cows with stillbirth at their first parity (P<۰.۰۱).
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Authors
H. ATASHI
Department of Animal Science, College of Agriculture, Shiraz University, Shiraz, I. R. Iran
M. J. ZAMIRI
Department of Animal Science, College of Agriculture, Shiraz University, Shiraz, I. R. Iran
M. B. SAYYADNEJAD
Animal Breeding Center, Karaj, I. R. Iran