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Effect of Levels of Total Neutral Detergent Fiber and Forage-derived Neutral Detergent Fiber on Feed Intake and Milk production in Holstein Dairy Cows

홀스타인 착유우에서 중성세제불용섬유소의 수준과 조사료유래 중성세제불용섬유소의 수준이 사료섭취량 및 유생산성에 미치는 영향

  • Lee, Do Hyung (Department of Animal Science, Chonbuk National University) ;
  • Kwon, Chan Ho (Department of Horse, Companion and Wild Animal Science, Kyungpook National University) ;
  • Kim, Eun Joong (Department of Animal Science, Kyungpook National University) ;
  • Kim, Hyun-Jin (Research Institute for Agriculture and Life Sciences, Seoul National University) ;
  • Kim, Gyeom-Heon (Department of Animal Science and Technology, Konkuk University) ;
  • Kim, Soo-Ki (Department of Animal Science and Technology, Konkuk University)
  • 이도형 (전북대학교 동물자원학과) ;
  • 권찬호 (경북대학교 말특수동물학과) ;
  • 김은중 (경북대학교 축산학과) ;
  • 김현진 (서울대학교 농업생명과학연구원) ;
  • 김겸헌 (건국대학교 동물자원과학과) ;
  • 김수기 (건국대학교 동물자원과학과)
  • Received : 2013.12.07
  • Accepted : 2013.12.23
  • Published : 2013.12.31

Abstract

This study was conducted to investigate the effect of total neutral detergent fiber (NDF) and forage-derived NDF (fNDF) on nutrient intake and milk production in Holstein dairy cows. Thirty-six Holstein dairy cows at weeks 4 to 20 of lactation were included in this study. The cows were arranged in a randomized complete block design and assigned to one of six diets: 1) 38% NDF with 18% fNDF (HN-HF); 2) 38% NDF with 15% fNDF (HN-MF); 3) 38% with 12% fNDF (HN-LF); 4) 34% NDF with 18% fNDF (LN-HF); 5) 34% NDF with 15% fNDF (LN-MF); and 6) 34% with 12% fNDF (LN-LF). The cows were fed a total mixed ration twice daily (07:00 and 18:00 h) and given ad libitum access to feed and water throughout the experiment. Data on the intake of nutrients (DM, NEl, CP, NDF, fNDF, NFC), milk yield, composition, fat-corrected milk (FCM), fat and protein corrected milk (FPCM), and energy corrected milk (ECM) were analyzed. Lower dietary concentrations of total NDF or fNDF resulted in an increase in DM, NEl, and NFC intake (p<0.01), milk yield (p<0.05) and a lower milk fat concentration (p<0.01). The LN treatment showed no significant differences in milk fat concentration compared to the HN however, further reduction in fNDF decreased milk fat content (p<0.01). The lowest level of milk fat was observed in the LN-LF diet group. Changes in the dietary concentrations of NDF or fNDF did not affect the concentrations of milk protein or SNF (solid not fat), although the yield of milk protein and SNF increased with higher milk yield (p<0.01). The level of fNDF influenced the level of FCM (p=0.07), as well as FPCM and ECM yield (p<0.05). A highly positive correlation between fNDF intake and milk fat concentration was observed in animals with low NDF compared to those offered high NDF. A strong correlation was also observed between milk yield and low NDF intake compared to high NDF intake.

Acknowledgement

Supported by : 농림수산식품기술기획평가원(IPET)

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