scholarly journals Genetics of residual feed intake in growing pigs: Relationships with production traits, and nitrogen and phosphorus excretion traits1

2013 ◽  
Vol 91 (6) ◽  
pp. 2542-2554 ◽  
Author(s):  
R. Saintilan ◽  
I. Mérour ◽  
L. Brossard ◽  
T. Tribout ◽  
J. Y. Dourmad ◽  
...  
Keyword(s):  
Feed Intake ◽  
Residual Feed Intake ◽  
Growing Pigs ◽  
Production Traits ◽  
Nitrogen And Phosphorus ◽  
Phosphorus Excretion

scholarly journals 146 Survey of residual feed intake in Katahdin and Texel lambs in a feedlot environment

2020 ◽  
Vol 98 (Supplement_2) ◽  
pp. 75-76
Author(s):  
Camren l Maierle ◽  
Andrew R Weaver ◽  
Eugene Felton ◽  
Scott P Greiner ◽  
Scott A Bowdridge
Keyword(s):  
Feed Intake ◽  
Feed Efficiency ◽  
Large Scale ◽  
Residual Feed Intake ◽  
Production Traits ◽  
Meaningful Improvement ◽  
Average Intake ◽  
Test Population ◽  
Feeding Trials ◽  
Genetic Evaluations

Abstract Residual feed intake (RFI) is quickly becoming the preferred measurement of efficiency in many species due to its inherent independence of most other important production traits. Making meaningful improvement in feed efficiency of sheep will require a consistent methodology to accurately identify efficient individuals. Due to difficulty in measuring this trait efforts must be made to incorporate efficiency data in large-scale genetic evaluations. The aim of this study was to evaluate lambs in a feedlot with large-scale genetic evaluations for feed efficiency calculated by residual feed intake (RFI) utilizing a Growsafe™ system. RFI was calculated by subtracting expected intake from actual intake. Expected intake was determined by regressing metabolic body size of mid-test weight. Regression determined ADG on actual intake for individuals in the population. Texel (n = 58) and Katahdin (n = 118) lambs were placed in a feedlot and fed in separate feeding trials, a complete pellet ad libitum as the sole source of nutrition. In this environment Texel and Katahdin lambs had expected ADG values (0.27 kg/day, 0.32 kg/day respectively) and actual intake data (2154.17 g/day, 1909.33 g/day respectively. After a period of adaptation, Texel average intake was determined over a period of 27 consecutive days and used to calculate individual RFI within the test population. Observable ranges of RFI (-0.62 – +0.62) were seen in the Texel lambs. At the start of the Katahdin trial lambs were separated by sex and FEC treatment. After a period of adaptation, Katahdin average intake was determined over a period of 42 consecutive days and used to calculate individual RFI within the test population. Observable ranges of RFI (-0.53 – +0.50) were seen in the Katahdin lambs as well. In both feeding trials RFI appeared to be normally distributed. Use of this technology may be useful in identifying superior individuals for feed efficiency.

scholarly journals Impact of selection for residual feed intake on production traits and behavior of mule ducks

2016 ◽  
Vol 95 (9) ◽  
pp. 1999-2010 ◽  
Author(s):  
L. Drouilhet ◽  
R. Monteville ◽  
C. Molette ◽  
M. Lague ◽  
A. Cornuez ◽  
...  
Keyword(s):  
Feed Intake ◽  
Residual Feed Intake ◽  
Production Traits ◽  
Selection For ◽  
And Behavior

Effect of micronization of peas and enzyme supplementation on nutrient excretion and manure volume in growing pigs

2003 ◽  
Vol 83 (4) ◽  
pp. 749-754 ◽  
Author(s):  
Z. Zhang ◽  
C. M. Nyachoti ◽  
S. Arntfield ◽  
W. Guenter ◽  
S. Cenkowski
Keyword(s):  
Urine Volume ◽  
Dietary Treatment ◽  
Growing Pigs ◽  
Nitrogen Excretion ◽  
Pig Manure ◽  
Feed Conversion ◽  
Nitrogen And Phosphorus ◽  
Nutrient Excretion ◽  
Phosphorus Excretion ◽  
Enzyme Supplementation

The effect of micronization of peas and enzyme supplementation on performance, nitrogen and phosphorus excretion as well as manure output was investigated in a study with 12 Cotswold gilts (26.9 ± 3.6 kg initial body weight). Three diets based on barley-raw peas (control), barley-micronized peas, or barley-micronized peas plus a multi-enzyme blend were used. The study was conducted in two blocks and within a block; each diet was randomly assigned to four pigs to give a total of eight observations per diet. Pigs fed micronized peas and micronized peas plus enzyme diets had higher (P < 0.05) feed conversion than the control. Compared with the control, micronization of peas reduced (P < 0.05) wet and dry fecal output by 33 and 25%, respectively. Urine volume was not influenced (P > 0.05) by dietary treatment. Total fecal phosphorus excretion was lower (P < 0.001) in gilts fed the micronized peas or micronized peas plus enzyme diets compared with the control. Micronization of peas reduced (P < 0.05) total nitrogen excretion in pig manure by 21.5% (17.39 vs. 13.65 g d-1). In conclusion, formulating pig grower diets with micronized peas improves nitrogen and phosphorus utilization and reduces total manure volume. Key words: Pigs, nitrogen, phosphorus, manure volume, micronized peas

479 Determining Effects of Residual Feed Intake on Economically Important Production Traits in Crossbreed Beef Cattle.

2018 ◽  
Vol 96 (suppl_2) ◽  
pp. 256-257
Author(s):  
S A Hershorin ◽  
R Manjarin ◽  
A M Emond ◽  
S Id-Lahoucine ◽  
P Fonseca ◽  
...  
Keyword(s):  
Beef Cattle ◽  
Feed Intake ◽  
Residual Feed Intake ◽  
Production Traits

scholarly journals Relationship between Residual Feed Intake and Production Traits in a Population of F2 Ducks

2019 ◽  
Vol 56 (1) ◽  
pp. 27-31
Author(s):  
Yun-sheng Zhang ◽  
Ya-xi Xu ◽  
Wen-lei Fan ◽  
Zheng-kui Zhou ◽  
Zhi-ying Zhang ◽  
...  
Keyword(s):  
Feed Intake ◽  
Residual Feed Intake ◽  
Production Traits

scholarly journals New residual feed intake criterion for longitudinal data

2021 ◽  
Vol 53 (1) ◽  
Author(s):  
Ingrid David ◽  
Van-Hung Huynh Tran ◽  
Hélène Gilbert
Keyword(s):  
Regression Model ◽  
Feed Intake ◽  
Genetic Correlations ◽  
Residual Feed Intake ◽  
Repeated Measurements ◽  
Regression Coefficients ◽  
Production Traits ◽  
Breeding Values ◽  
Time Points ◽  
Heritability Estimates

Abstract Background Residual feed intake (RFI) is one measure of feed efficiency, which is usually obtained by multiple regression of feed intake (FI) on measures of production, body weight gain and tissue composition. If phenotypic regression is used, the resulting RFI is generally not genetically independent of production traits, whereas if RFI is computed using genetic regression coefficients, RFI and production traits are independent at the genetic level. The corresponding regression coefficients can be easily derived from the result of a multiple trait model that includes FI and production traits. However, this approach is difficult to apply in the case of multiple repeated measurements of FI and production traits. To overcome this difficulty, we used a structured antedependence approach to account for the longitudinality of the data with a phenotypic regression model or with different genetic and environmental regression coefficients [multi- structured antedependence model (SAD) regression model]. Results After demonstrating the properties of RFI obtained by the multi-SAD regression model, we applied the two models to FI and production traits that were recorded for 2435 French Large White pigs over a 10-week period. Heritability estimates were moderate with both models. With the multi-SAD regression model, heritability estimates were quite stable over time, ranging from 0.14 ± 0.04 to 0.16 ± 0.05, while heritability estimates showed a U-shaped profile with the phenotypic regression model (ranging from 0.19 ± 0.06 to 0.28 ± 0.06). Estimates of genetic correlations between RFI at different time points followed the same pattern for the two models but higher estimates were obtained with the phenotypic regression model. Estimates of breeding values that can be used for selection were obtained by eigen-decomposition of the genetic covariance matrix. Correlations between these estimated breeding values obtained with the two models ranged from 0.66 to 0.83. Conclusions The multi-SAD model is preferred for the genetic analysis of longitudinal RFI because, compared to the phenotypic regression model, it provides RFI that are genetically independent of production traits at all time points. Furthermore, it can be applied even when production records are missing at certain time points.

scholarly journals Genetic parameters and halothane genotype effect for residual feed intake in Piétrain growing pigs

2011 ◽  
Vol 142 (1-3) ◽  
pp. 203-209 ◽  
Author(s):  
R. Saintilan ◽  
I. Mérour ◽  
S. Schwob ◽  
P. Sellier ◽  
J. Bidanel ◽  
...  
Keyword(s):  
Feed Intake ◽  
Genetic Parameters ◽  
Residual Feed Intake ◽  
Growing Pigs ◽  
Genotype Effect
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