Evaluation of the Milk Productivity and Nutrient Balance of Forage Sources for Organic Dairy Farms in Korea
2016
Na, Y.J., Konkuk University, Seoul, Republic of Korea | Shin, K.M., Konkuk University, Seoul, Republic of Korea | Rim, J.S., Konkuk University, Seoul, Republic of Korea | Bang, J.W., Seoul Women's University, Seoul, Republic of Korea | Lee, S.R., Konkuk University, Seoul, Republic of Korea
This study was conducted to evaluate the milk productivity and nutrient balance in organic dairy farms located at Gochang-gun of Korea with different feed sources. The total number of organic dairy farms was 12 in 2012, 13 in 2013, and 14 in 2014. The numbers of farms and dairy herds were increased each year. The average milk yields in 2012, 2013, and 2014 were 25.5, 24.6, and 24.4 kg/d, respectively. The average milk fat contents in 2012, 2013, and 2014 were 3.5%, 3.6%, and 3.7%, respectively. The average milk protein contents in 2012, 2013, and 2014 were 3.3%, 3.4%, and 3.4% in 2012, 2013, and 2014, respectively. Although the average milk yield of organic dairy farms was 9 kg/cows/d less than the average milk yield of other dairy farms in Korea, milk fat and protein contents of organic dairy farms were higher than those of other dairy farms. Alfalfa hay, oat hay, corn silage, rye grass silage, Sudan grass silage, rice straw, and barley silage were commonly used as forage sources in organic dairy farms. The average silage intake (15.6 kg/cow/d) of organic dairy farms in 2013 was higher (P less than 0.05), while the average hay intake (5.1 kg/cow/d) in 2014 was higher (P less than 0.05) than that of other feed intake. Net energy for lactation (NEL) and metabolizable protein (MP) were calculated in accordance with NRC (2001). Net energy for lactation intake was higher (P less than 0.05) while MP intake was lower (P less than 0.05) than NRC recommendation values in 2013 and 2014. These results indicate that domestic organic dairy farms should use feed considering energy and protein balance recommended by NRC.
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