0.906
IF5
0.875
IF
Q3
JCR
1.0
CiteScore
0.374
SJR
Q2
SJR
20
MNiSW
165.24
ICV
ORIGINAL PAPER
 
CC-BY 4.0
 
 

Performance, carcass quality and blood metabolites of Holstein bulls on feedlot feeding of different proportions of barley grain to maize grain

F. Fatehi 1,  
M. Dehghan-banadaky 1  ,  
K. Reza-yazdi 1,  
 
1
University of Tehran, Department of Animal Science, Campus of Agriculture and Natural Resources, PC 31587-77871 Karaj, Iran
2
Department of Animal and Food Sciences Texas Tech University Lubbock 79409-2141, Texas, USA
J. Anim. Feed Sci. 2013;22(1):35–43
Publication date: 2013-03-22
KEYWORDS
ABSTRACT
This experiment was conducted to study the effects of five different ratios of barley grain to maize grain: 1) 100:00, 2) 75:25, 3) 50:50, 4) 25:75, and 5) 00:100 on feedlot performance, carcass quality, ruminal and blood parameters of twenty-five Holstein bulls. Quadratic effects were detected for carcass efficiency and were greatest for diets with barley grain-to-maize grain ratios of 75:25 and 50:50 compared with other diets. Also, back-fat thickness, abdominal fat, and meat ether extract increased as the proportion of maize increased in the diets (P < 0.05). When the proportion of maize in diets increased, the amount of undigested grain in feces increased linearly (P < 0.05). At 3 and 6 h after feeding, as the proportion of barley increased in the diets, ruminal pH decreased quadratically. We conclude that feeding bulls diets based on 50:50 and 75:25 barley-to-maize grain ratios resulted in higher carcass efficiency and optimal ruminal parameters.
CORRESPONDING AUTHOR
M. Dehghan-banadaky   
University of Tehran, Department of Animal Science, Campus of Agriculture and Natural Resources, PC 31587-77871 Karaj, Iran
 
CITATIONS (1):
1. Influence of barley grain particle size and treatment with citric acid on digestibility, ruminal fermentation and microbial protein synthesis in Holstein calves
M. Kazemi-Bonchenari, A. Z. M. Salem, S. López
animal
ISSN:1230-1388