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Paper Information

Journal:   IRANIAN JOURNAL OF AGRICULTURAL SCIENCES (JOURNAL OF AGRICULTURE)   2006 , Volume 37 , Number 5; Page(s) 831 To 838.
 
Paper: 

STUDY OF SOME EFFECTIVE FACTORS ON REPRODUCTIVE PERFORMANCE OF HOLSTEIN DAIRY COWS, TEHRAN PROVINCE

 
 
Author(s):  HEMATI M., ZARE SHAHNEH A.R., VAEZ TORSHIZI R.
 
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Abstract: 

This study was carried out to determine the reproductive performance of Tehran Province Holstein dairy cows and some factors affectingit, while using 30678recordsfrom6913cows. At estimation of means and standard deviation of calving interval, days open, calving to first service interval, and first service to conception interval were 397.50±60.50, 122.10±62.45, 93.20±41.00 and 24.60±12.00 days, respectively. Effects of herd, calving season, lactation number and milk yield on reproductive performance were significant (P<0.001). Effect of sex of calf on calving to first service interval was significant (P<0.01).The results suggest that, the most and the least days open pertained to spring and autumn calving respectively. Days open increased from the fifth lactation number. The reproductive performance decreased with increasing milk yield.

 
Keyword(s): HOLSTEIN COW, REPRODUCTIVE PERFORMANCE
 
References: 
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