Covariance Among Lactation Number, Growth Performance, Calving Interval, and Milk Yield in Holstein Dairy Cows in Korea
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A diverse of recommendation has been made for the structure and management of dairy cows,despite demanding research, the relationship between lactation number and various factors is yetto be established. The present study was aimed to investigate the covariance among lactationnumber, growth performance, calving interval, and milk production was considered to increase anefficiency of selection schemes and to manage more efficiently Holstein dairy cows that havebeen raised on small-scale family farms in Republic of Korea. For that purpose, the data wereobserved from 850 Holstein dairy cows, which a total of 3929 milking, since April 2016 -January 2017. We measured the body weight, height, age, calving interval, and milk productionof the each dairy cow. Also, information about the date of lactation, calving interval, and milkproduction was recorded using an automatic milking system(AMS) with identification numbers. Milk production was calculated per udder quarter in the AMS. Our study results showed theincreased average body weight(p>0.05) in 1, 2, 3, and 4th lactating dairy cows and afterwards,we noticed the tendency on the average body weight(p<0.05) per lactation progressed. There wasno significant difference noticed on height measurement of dairy cows. From the processing dataof 850 Holstein dairy cows, the lactation number 1 and 7 had a greater calving interval withsignificantly lowered milk production, and the lactation number 2, 3, 4, 5, and 6 hadsignificantly lowered the calving interval(p<0.05) with a greater milk production. From our studyresults, we evidenced that there is a significant relationship between the lactation number, growthperformance, calving interval, and milk yield, and the maximum production of milk occurring inthe 3rd and 4th lactation dairy cows. The achieved results from this study can be used by thesmall-scale farmers to encourage the structure and management of growth performance, calvinginterval, and milk yield in Holstein dairy cows in Korea.
Abstract
A diverse of recommendation has been made for the structure and management of dairy cows,despite demanding research, the relationship between lactation number and various factors is yetto be established. The present study was aimed to investigate the covariance among lactationnumber, growth performance, calving interval, and milk production was considered to increase anefficiency of selection schemes and to manage more efficiently Holstein dairy cows that havebeen raised on small-scale family farms in Republic of Korea. For that purpose, the data wereobserved from 850 Holstein dairy cows, which a total of 3929 milking, since April 2016 -January 2017. We measured the body weight, height, age, calving interval, and milk productionof the each dairy cow. Also, information about the date of lactation, calving interval, and milkproduction was recorded using an automatic milking system(AMS) with identification numbers. Milk production was calculated per udder quarter in the AMS. Our study results showed theincreased average body weight(p>0.05) in 1, 2, 3, and 4th lactating dairy cows and afterwards,we noticed the tendency on the average body weight(p<0.05) per lactation progressed. There wasno significant difference noticed on height measurement of dairy cows. From the processing dataof 850 Holstein dairy cows, the lactation number 1 and 7 had a greater calving interval withsignificantly lowered milk production, and the lactation number 2, 3, 4, 5, and 6 hadsignificantly lowered the calving interval(p<0.05) with a greater milk production. From our studyresults, we evidenced that there is a significant relationship between the lactation number, growthperformance, calving interval, and milk yield, and the maximum production of milk occurring inthe 3rd and 4th lactation dairy cows. The achieved results from this study can be used by thesmall-scale farmers to encourage the structure and management of growth performance, calvinginterval, and milk yield in Holstein dairy cows in Korea.
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