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The effect of lactation number, stage, length, and milking frequency on milk yield in Korean Holstein dairy cows using automatic milking system

  • Vijayakumar, Mayakrishnan (Dairy Science Division, National Institute of Animal Science, Rural Development Administration) ;
  • Park, Ji Hoo (Dairy Science Division, National Institute of Animal Science, Rural Development Administration) ;
  • Ki, Kwang Seok (Dairy Science Division, National Institute of Animal Science, Rural Development Administration) ;
  • Lim, Dong Hyun (Dairy Science Division, National Institute of Animal Science, Rural Development Administration) ;
  • Kim, Sang Bum (Dairy Science Division, National Institute of Animal Science, Rural Development Administration) ;
  • Park, Seong Min (Dairy Science Division, National Institute of Animal Science, Rural Development Administration) ;
  • Jeong, Ha Yeon (Dairy Science Division, National Institute of Animal Science, Rural Development Administration) ;
  • Park, Beom Young (Dairy Science Division, National Institute of Animal Science, Rural Development Administration) ;
  • Kim, Tae Il (Dairy Science Division, National Institute of Animal Science, Rural Development Administration)
  • Received : 2016.11.18
  • Accepted : 2017.03.19
  • Published : 2017.08.01

Abstract

Objective: The aim of the current study was to describe the relationship between milk yield and lactation number, stage, length and milking frequency in Korean Holstein dairy cows using an automatic milking system (AMS). Methods: The original data set consisted of observations from April to October 2016 of 780 Holstein cows, with a total of 10,751 milkings. Each time a cow was milked by an AMS during the 24 h, the AMS management system recorded identification numbers of the AMS unit, the cow being milking, date and time of the milking, and milk yield (kg) as measured by the milk meters installed on each AMS unit, date and time of the lactation, lactation stage, milking frequency (NoM). Lactation stage is defined as the number of days milking per cows per lactation. Milk yield was calculated per udder quarter in the AMS and was added to 1 record per cow and trait for each milking. Milking frequency was measured the number of milkings per cow per 24 hour. Results: From the study results, a significant relationship was found between the milk yield and lactation number (p<0.001), with the maximum milk yield occurring in the third lactation cows. We recorded the highest milk yield, in a greater lactation length period of early stage (55 to 90 days) at a $4{\times}$ milking frequency/d, and the lowest milk yield was observed in the later stage (>201 days) of cows. Also, milking frequency had a significant influence on milk yield (p<0.001) in Korean Holstein cows using AMS. Conclusion: Detailed knowledge of these factors such as lactation number, stage, length, and milking frequency associated with increasing milk yield using AMS will help guide future recommendations to producers for maximizing milk yield in Korean Dairy industries.

Keywords

Milk Yield;Lactation Number;Lactation Length;Milking Frequency;Automatic Milking System (AMS);Korean Holstein Dairy Cows

Acknowledgement

Grant : Studies on the growth curve of dairy cows during lactation

Supported by : Rural Development Administration

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