scholarly journals Phenotypic and genetic relationships among feeding behavior traits, feed intake, and residual feed intake in steers fed grower and finisher diets1

2011 ◽  
Vol 89 (11) ◽  
pp. 3401-3409 ◽  
Author(s):  
O. N. Durunna ◽  
Z. Wang ◽  
J. A. Basarab ◽  
E. K. Okine ◽  
S. S. Moore
Keyword(s):  
Feeding Behavior ◽  
Feed Intake ◽  
Genetic Relationships ◽  
Residual Feed Intake

scholarly journals Association between residual feed intake and enteric methane emissions in Hereford steers

2018 ◽  
Vol 3 (1) ◽  
pp. 239-246 ◽  
Author(s):  
Yoana Dini ◽  
Cecilia Cajarville ◽  
José I Gere ◽  
Sofía Fernandez ◽  
Martín Fraga ◽  
...  
Keyword(s):  
Feeding Behavior ◽  
Methane Emission ◽  
Feed Intake ◽  
Sulfur Hexafluoride ◽  
Quantitative Polymerase Chain Reaction ◽  
Daily Intake ◽  
Residual Feed Intake ◽  
Live Weight ◽  
Repeated Measurements ◽  
Ch4 Production

Abstract The objective of this study was to quantify the emissions of enteric CH4 from growing Hereford steers raised under feedlot conditions based on contrasting levels of residual feed intake (RFI). A repeated measurements experiment was conducted over 20 d to determine CH4 production from two groups of nine Hereford steers, with contrasting RFI values (mean ± SD): low RFI (LRFI group; −0.78 ± 0.22 kg DMI/d) vs. high RFI (HRFI group; 0.83 ± 0.34 kg DMI/d). Steers were selected from a larger contemporary population in which the RFI was evaluated. Steers were maintained under confined conditions with ad libitum access to water and feed, comprising a total mixed ration of 55% sorghum silage, 21% barley silage, 21% corn grain, and 3% protein–mineral–vitamin–premix, provided twice a day. Before the beginning of CH4 measurements, the live weight of both groups of animals was determined, which on average (±SEM) was 357.0 ± 5.11 and 334.0 ± 10.17 kg in the LRFI and HRFI groups, respectively. Methane emission (g/d) was measured on each animal with the sulfur hexafluoride (SF6) tracer technique, during two consecutive periods of 5 d. Individual daily intake and feeding behavior characteristics were measured using a GrowSafe automated feeding system (Model 6000, GrowSafe Systems Ltd, Airdrie, Alberta, Canada). Methanogens in the ruminal content were quantified using quantitative polymerase chain reaction with primers targeting the mcrA gene. Methane emission was near 27% lower in animals with LRFI when expressed in absolute terms (g/d; 26.8%; P = 0.009), by unit of dry matter intake (g CH4/kg; 27.9%, P = 0.021), or as % of gross energy intake (26.7%; P = 0.027). These differences could not be explained by differences in amount of total of methanogens (average = 9.82 log10 units; P = 0.857). However, there were some differences in animal feeding behavior that could explain these differences (e.g., LRFI animals tended to spend less time in feeders). Our results suggest that, in Hereford steers, the selection by RFI values is a promising mitigation strategy for the reduction of the emission of enteric CH4.

Feeding Behavior of Yorkshire Pigs Selected for Residual Feed Intake

2009 ◽  
Author(s):  
Jennifer Young ◽  
Weiguo Cai ◽  
Daniel S. Nettleton ◽  
Jack C.M. Dekkers
Keyword(s):  
Feeding Behavior ◽  
Feed Intake ◽  
Residual Feed Intake ◽  
Yorkshire Pigs

Relationship between feeding behavior and residual feed intake in growing Brangus heifers

2009 ◽  
Vol 87 (8) ◽  
pp. 2685-2689 ◽  
Author(s):  
G. M. Bingham ◽  
T. H. Friend ◽  
P. A. Lancaster ◽  
G. E. Carstens
Keyword(s):  
Feeding Behavior ◽  
Feed Intake ◽  
Residual Feed Intake
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