Paper Information

Journal:   JOURNAL OF ANIMAL SCIENCE   WINTER 2010 , Volume 2 , Number 2; Page(s) 79 To 84.
 
Paper: 

THE EFFECT OF CALVING TIME (MONTH & SEASON) ON AVERAGE OF FIRST ESTRUS, FIRST SERVICE AFTER PARTURATION AND AVERAGE OF DAYS OPEN IN HOLSTEIN COWS

 
 
Author(s):  DIANAT V., BEHESHTI R.
 
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Abstract: 

In this research, after numerous visits from dairy cattle farms in east and west Azarbayjan and Ardebil provinces (which had optimal nutritional and hygienic status), data were collected from 6396 cow. Animals were divided into 12 groups (based on month of birth) and 4 groups (based on season of birth). According to collected data about the average of first estrus and of insemination after parturation and average of days open in each group, effect of month and season of birth were studied. Results showed that there is no significant statistical differences in average of first estrus and first insemination between groups (P>0.05), but we found a significant difference between groups concerning the days open according to month (p<0.05) and season of birth (P<0.01).
Our data from Holstein cow were showed that month and season of birth had no effect on average of first estrus and insemination, but it effects on average of days open.

 
Keyword(s): CALVING SEASON, DAYS OPEN, FIRST ESTRUS, HOLSTEIN, FIRST INSEMINATION, COW
 
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