scholarly journals Relationship of Residual Feed Intake on Specific Hematological and Biochemical Parameters in Rambouillet Sheep

2011 ◽  
Vol 6 (3) ◽  
pp. 87-91 ◽  
Author(s):  
R.M. Rincon- Delgado ◽  
H. Gutierrez- ◽  
E.D. Perez-Vszq ◽  
A. Muro-Reyes ◽  
L.H. Diaz-Garci ◽  
...  
Keyword(s):  
Feed Intake ◽  
Biochemical Parameters ◽  
Residual Feed Intake ◽  
Hematological And Biochemical Parameters ◽  
Relationship Of

scholarly journals Relationship of Residual Feed Intake on Specific Hematological and Biochemical Parameters in Rambouillet Sheep

2011 ◽  
Vol 10 (9) ◽  
pp. 1112-1116 ◽  
Author(s):  
R.M. Rincon-Del ◽  
H. Gutierrez- ◽  
E.D. Perez-Vazq ◽  
A. Muro-Reyes ◽  
L.H. Diaz-Garci ◽  
...  
Keyword(s):  
Feed Intake ◽  
Biochemical Parameters ◽  
Residual Feed Intake ◽  
Hematological And Biochemical Parameters ◽  
Relationship Of

34 Relationship of Blood-Borne Markers of Subclinical Infection and Residual Feed Intake Status in Brangus Heifers.

2018 ◽  
Vol 96 (suppl_1) ◽  
pp. 18-18
Author(s):  
K N Nielsen ◽  
C P Tadych ◽  
M A Edmondson ◽  
L A Kriese-Anderson ◽  
T D Brandebourg
Keyword(s):  
Feed Intake ◽  
Residual Feed Intake ◽  
Subclinical Infection ◽  
Relationship Of

Residual feed intake adjusted for backfat thickness and feeding frequency is independent of fertility in beef heifers

2011 ◽  
Vol 91 (4) ◽  
pp. 573-584 ◽  
Author(s):  
J. A. Basarab ◽  
M. G. Colazo ◽  
D. J. Ambrose ◽  
S. Novak ◽  
D. McCartney ◽  
...  
Keyword(s):  
Feed Intake ◽  
Feeding Activity ◽  
Residual Feed Intake ◽  
Backfat Thickness ◽  
Feed Conversion ◽  
Beef Heifers ◽  
Feeding Frequency ◽  
Calving Rate ◽  
Age At Puberty ◽  
Relationship Of

Basarab, J. A., Colazo, M. G., Ambrose, D. J., Novak, S., McCartney, D. and Baron, V. S. 2011. Residual feed intake adjusted for backfat thickness and feeding frequency is independent of fertility in beef heifers. Can. J. Anim. Sci. 91: 573–584. This study examined the effects of residual feed intake (RFI), RFI adjusted for off-test backfat thickness (RFIfat) and RFI adjusted for off-test backfat thickness and feeding event frequency (RFIfat & activity) on heifer fertility and productivity. Beef heifers (n=190) were monitored for individual daily feed intake and feeding event activity over 108–112 d using the GrowSafe System® and assessed for age at puberty based on plasma progesterone concentration. Individual animal daily feed intake, feeding event activity and off-test backfat thickness were then used to calculate RFI, RFIfat and RFIfat & activity and group heifers as either negative ([−], RFI<0.0) or positive ([+], RFI≥0.0) for RFI. Heifers averaged 298 kg (SD=34) in body weight, were 276 days of age (SD=19) at the start of test, grew at 0.90 kg d−1 (SD=0.21), consumed 7.62 kg DM head−1 d−1 (SD=0.84) and had a feed conversion ratio of 8.93 (SD=2.43). Age (351 d, SD=43) and weight (367.3 kg, SD=45.0) at puberty were similar between [−] and [+] RFI heifers, but age at puberty was delayed in [−] RFIfat (P=0.04) and RFIfat & activity (P=0.08) heifers compared with [+] RFIfat and RFIfat & activity heifers. Efficient or [−] RFI heifer exhibited a lower pregnancy (76.84 vs. 86.32%, P=0.09) and calving rate (72.63 vs. 84.21%, P=0.05) compared with [+] RFI heifers. These differences were partially removed in [−] RFIfat and completely removed in [−] RFIfat & activity compared with their [+] RFI counterparts (pregnancy rate, 80.85 vs. 82.29%, P=0.80; calving rate, 75.53 vs. 81.25%, P=0.34). No differences were observed between efficient and inefficient heifers in calving difficulty, average calving date, age at first calving, calf birth weight, calf pre-weaning ADG, calf weaning weight and heifer productivity. However, [+] RFI heifers exhibited a 1.9-fold higher calf death loss compared with [−] RFI heifers (11.11% vs. 5.71%, P=0.24). This difference was more pronounced in [+] RFIfat and [+] RFIfat & activity heifers, which exhibited 2.2-fold (11.84% vs. 5.33%, P=0.15) and 3.0-fold (12.66% vs. 4.17%, P=0.06) higher calf death loss compared with [−] RFI heifers. There was no relationship of RFI adjusted for backfat thickness and feeding activity on fertility traits indicating that backfat thickness and feeding activity may be associated with feed intake and should be considered when selecting heifers for improved feed efficiency.

scholarly journals Relationship of gene markers to residual feed intake, ADG, and marbling of 4 years of MSU Steer-A-Year steers1

2020 ◽  
Vol 4 (Supplement_1) ◽  
pp. S160-S164
Author(s):  
Makae F Nack ◽  
Hannah M DelCurto Wyffels ◽  
Samuel A Wyffels ◽  
Timothy DelCurto
Keyword(s):  
Feed Intake ◽  
Residual Feed Intake ◽  
Gene Markers ◽  
Relationship Of
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