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Paper Information

Journal:   AGRICULTURAL SCIENCES AND TECHNOLOGY   2006 , Volume 20 , Number 7; Page(s) 105 To 114.
 
Paper: 

GENETIC EVALUATION OF MILK YIELD, FERTILITY AND HERD LIFE ON HOLSTEIN CATTLE OF IRAN

 
 
Author(s):  FALLAHKHEIR A.R., ESCANDARINASAB M.P., SHADPARVARL A.A.
 
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Abstract: 
Effect of 305 days milk yield corrected for 3.5 fat percentage on fertility traits including age at first calving, interval among first and second, second and third, average of first to third lactation, average of total calving intervals and days from calving to first insemination and herd life as economic traits by the target of breeding and estimation of the best level of performance, 55596 records of Holstein cattle of Iran at first lactations have presented. In this research after evaluation of herd life predicted equation as the independent variable and modeling of continuous variable with all of its significant effects (P<0.01), all of the possible probabilities for simulating rank of records of milk yield, age at first calving and first lactation days open and predicted herd life were ordered. Increasing in milk yield at first lactation significant (P<0.01) caused to increase the cattle herd life. First and second calving interval had negative and significant phenotype correlations with the milk yield and herd life. but this correlation was positive for next parities. It seems that milk yield between 9377 to 9705.5 kg, age at first calving between 740 to 796 days and first lactation days open between 126 to 142 days are disirable to prepare for cattle herd life between 1981 to 2073 days.
 
Keyword(s): MILK YIELD, FERTILITY, CALVING INTERVAL, HERD LIFE, HOLSTEIN CATTLE
 
References: 
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