0.857
IF5
0.900
IF
Q3
JCR
0.92
CiteScore
0.405
SJR
Q2
SJR
20
MNiSW
165.24
ICV
SHORT COMMUNICATION
 
CC-BY 4.0
 
 

Effects of maize and lucerne particle size on ruminal passage rate, chewing activity of cows in midlactation

Z. J. Cao 1,  
M. Ma 1,  
L. L. Wang 1,  
P. Chen 1,  
S. L. Li 1  
 
1
State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, 100094 Beijing, P.R. China
J. Anim. Feed Sci. 2007;16(Suppl. 2):424–429
Publish date: 2007-09-17
KEYWORDS
ABSTRACT
This study evaluated the effects of maize and lucerne particle size on ruminal passage rate and chewing activity in midlactation cows. Four multiparous Holstein cows with ruminal cannulas were assigned randomly to a 4 × 4 Latin square design. Treatments were arranged in a 2 × 2 factorial design; two lucerne particle sizes: 2.54 mm (short) and 6.22 mm (long) were combined with concentrates based on either ground maize (711 µm) or cracked maize (1755 µm). Diets were fed as a total mixed ration with a ratio of concentrate to forage of 39:61. No significant difference in dry matter intake, ruminal passage rate and chewing activity between ground maize and cracked maize were observed. Ruminal liquid passage rate increased from 11.3 to 12.1%/h (P=0.02) and ruminal solids passage rate tended to decrease from 6.4 and 6.0%/h when short lucerne was fed to cows. Cows fed long lucerne hay spent more time ruminating compared to cows fed short lucerne hay (P<0.001). Total time spent on chewing by cows increased from 505 to 574 min/d (P=0.002) for short lucerne and long lucerne, respectively
CORRESPONDING AUTHOR
S. L. Li   
State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, 100094 Beijing, P.R. China
ISSN:1230-1388