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http://dx.doi.org/10.5333/KGFS.2013.33.4.304

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

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)
Publication Information
Journal of The Korean Society of Grassland and Forage Science / v.33, no.4, 2013 , pp. 304-312 More about this Journal
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.
Keywords
Forage-NDF; Milk yield; Dairy cow;
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