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ATASHI, H., ZAMIRI, M. J., SAYYADNEJAD, M. B.. (1391). Non-Genetic Factors Affecting Stillbirth and its Effects on Longevity, Production, and Reproductive Performance in Holstein Cows of Iran. , 30(1.2), 73-82. doi: 10.22099/iar.2012.503
H. ATASHI; M. J. ZAMIRI; M. B. SAYYADNEJAD. "Non-Genetic Factors Affecting Stillbirth and its Effects on Longevity, Production, and Reproductive Performance in Holstein Cows of Iran". , 30, 1.2, 1391, 73-82. doi: 10.22099/iar.2012.503
ATASHI, H., ZAMIRI, M. J., SAYYADNEJAD, M. B.. (1391). 'Non-Genetic Factors Affecting Stillbirth and its Effects on Longevity, Production, and Reproductive Performance in Holstein Cows of Iran', , 30(1.2), pp. 73-82. doi: 10.22099/iar.2012.503
ATASHI, H., ZAMIRI, M. J., SAYYADNEJAD, M. B.. Non-Genetic Factors Affecting Stillbirth and its Effects on Longevity, Production, and Reproductive Performance in Holstein Cows of Iran. , 1391; 30(1.2): 73-82. doi: 10.22099/iar.2012.503

Non-Genetic Factors Affecting Stillbirth and its Effects on Longevity, Production, and Reproductive Performance in Holstein Cows of Iran

Iran Agricultural Research
مقاله 7، دوره 30، شماره 1.2، خرداد 2011، صفحه 73-82    اصل مقاله (267.46 K)
نوع مقاله: Full Article
شناسه دیجیتال (DOI): 10.22099/iar.2012.503
نویسندگان
H. ATASHI* 1؛ M. J. ZAMIRI1؛ M. B. SAYYADNEJAD2
1Department of Animal Science, College of Agriculture, Shiraz University, Shiraz, I. R. Iran
2Animal Breeding Center, Karaj, I. R. Iran
چکیده
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 2000 to April 2009 comprising of 220,043 calvings on 102,199 cows in 33 herds were used. The results showed that 4.06% of the newborn calves died within 48 h of birth. The stillbirth rate was significantly higher for first parity cows (Pvs. 405.5 (±1.05) d (P<0.01), respectively]. The overall mean longevity was affected by stillbirth while the shortest lifetime was observed for cows with stillbirth at their first parity (P<0.01). 
کلیدواژه‌ها
Calving Interval؛ Holstein cows؛ Lactation Performance؛ Stillbirth
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