scholarly journals Relationship of glucocorticoids and hematological measures with feed intake, growth, and efficiency of finishing beef cattle1

2016 ◽  
Vol 94 (1) ◽  
pp. 275-283 ◽  
Author(s):  
A. P. Foote ◽  
K. E. Hales ◽  
R. G. Tait ◽  
E. D. Berry ◽  
C. A. Lents ◽  
...  
Keyword(s):  
Feed Intake ◽  
Relationship Of ◽  
Hematological Measures

Mass to height relationships in annual pastures and prediction of sheep growth rates

2014 ◽  
Vol 54 (9) ◽  
pp. 1305
Author(s):  
S. M. Robertson
Keyword(s):  
Feed Intake ◽  
Dry Matter ◽  
Dry Matter Accumulation ◽  
Sheep Grazing ◽  
Software Model ◽  
Low Mass ◽  
Grazing Systems ◽  
Sheep Production ◽  
Relationship Of ◽  
The Relationship

The relationship between pasture height and mass influences the availability of pasture for grazing, and is important for predicting intake of pasture and liveweight change by sheep. The relationship between pasture mass and structure and sheep production is poorly defined for low-mass, clumpy pastures in low-rainfall regions. Between 2001 and 2004, 480 quadrats of pastures were measured in 23 paddocks throughout the Victorian Mallee. Pasture height was related to live mass for medic (linear; r2 = 0.70; P < 0.001) and grassy medic (asymptotic; r2 = 0.64; P < 0.001) pastures, and prediction of grassy medic pasture height was improved by inclusion of proportion live groundcover. During 2004, pasture dry matter accumulation and liveweight changes in sheep grazing annual pastures were measured and compared with predicted outputs from GrazFeed, a software model used to estimate feed intake and liveweight change in sheep. Improved predictions of liveweight gain in grazing sheep were obtained using measured height rather than the GrazFeed default height. The results show that the height to mass relationship of annual pastures in the Victorian Mallee differs between pasture types, between years, and may differ from other published relationships. This study provides information that may assist in the development of models of grazing systems.

Relationship of Various Blood Metabolites to Voluntary Feed Intake in Lactating Ewes

1970 ◽  
Vol 100 (5) ◽  
pp. 565-572 ◽  
Author(s):  
F. W. Thye ◽  
R. G. Warner ◽  
P. D. Miller
Keyword(s):  
Feed Intake ◽  
Blood Metabolites ◽  
Voluntary Feed Intake ◽  
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

scholarly journals Relationship of methionine plus cystine with lysine in diets for laying Japanese quails

2011 ◽  
Vol 40 (5) ◽  
pp. 1031-1037 ◽  
Author(s):  
Renata de Souza Reis ◽  
Sergio Luiz de Toledo Barreto ◽  
Paulo Cezar Gomes ◽  
Heder José D'Avila Lima ◽  
Paola Monteiro Medina ◽  
...  
Keyword(s):  
Feed Intake ◽  
Egg Production ◽  
Block Design ◽  
Experimental Unit ◽  
Egg Mass ◽  
Feed Conversion ◽  
Linear Effect ◽  
Japanese Quails ◽  
Relationship Of ◽  
Mass Feed

The objective of this work was to evaluate the relationships of methionine plus cystine with lysine for Japanese quails in the laying phase. Thus, it was used 480 birds at initial age of 65 days, distributed in randomized block design with 6 treatments, 10 replicates and 8 birds per experimental unit. The treatments consisted of basal diet deficient in methionine plus cystine (0.65%), with 19.6% of crude protein and 2800 kcal of metabolizable energy/kg of ration, supplemented with six levels of DL-methionine 98% (0.116; 0.167; 0.218; 0.269; 0.320 and 0.371%), corresponding to methionine plus cystine with lysine ratio of 0.65, 0.70, 0.75, 0.80, 0.85 and 0.90, and the digestible lysine set at a suboptimal level of 1.00. The parameters studied were: feed intake, egg production per hen day, egg production per housed hen, commercial egg production, egg weight, egg mass, feed conversion per egg mass, feed conversion per dozen eggs, viability of birds, weight of the egg components (yolk, albumen and shell), percentage of components of eggs, diameter and height of the eggs and specific gravity. It was observed an increasing linear effect for feed intake, egg diameter, shell weight and percentage of yolk. For eggshell percentage, it was observed a decreasing linear effect. For the weight of the eggs, the best adjustment was obtained by using the Linear Response Plateau model. A quadratic effect was observed for egg mass, feed conversion per egg mass, egg production per hen day, egg production per housed hen, yolk weight, albumen weight and height of the eggs. The relationship of methionine plus cystine with lysine of 0.84 which corresponds to the consumption of 221.0 mg/bird/day of methionine + cystine provides better performance and satisfactory quality of Japanese quail eggs.

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