Results 261 to 270 of about 86,546 (308)

Genetic and statistical properties of residual feed intake

Journal of Animal Science, 1993
Residual feed intake is defined as the difference between actual feed intake and that predicted on the basis of requirements for production and maintenance of body weight. Formulas were developed to obtain genetic parameters of residual feed intake from knowledge of the genetic and phenotypic parameters of the component traits.
Kennedy, B., Meuwissen, T.H.E., van der Werf, J.H.J.   +2 more
openaire   +3 more sources

Longitudinal analysis of body weight, feed intake and residual feed intake in F2 chickens

Livestock Science, 2016
The aim of this study was to estimate covariance functions, using B-spline random regression models for body weight (BW), feed intake (FI) and residual feed intake (RFI) in F2 chickens. Feed intake and body weight were recorded on each bird every week from 2 to 10 weeks of age.
Ali Akbar Masoudi, Alireza Ehsani, Just Jensen   +2 more
exaly   +3 more sources

Dissection of Koch's residual feed intake: Implications for selection

Poultry Science, 2013
For 50 yr, residual feed intake (RFI) has remained a black box even though many researchers have touted it as a more biological estimate of efficiency of feed utilization than feed conversion ratio (FCR). We successfully dissected the efficiency of feed utilization by decomposing the components of RFI and ascertained the contributions of its components.
Samuel E, Aggrey, Romdhane, Rekaya
exaly   +3 more sources

Variation in residual feed intake depends on feed on offer

Animal Production Science, 2018
Two small pen trials with cattle and sheep both clearly demonstrated that while there is significant variation in residual feed intake when on high energy supply, there is negligible variation when energy supply is limited. A review of literature demonstrated that this is also the case when energy supply is limited by heat or physiological state, such ...
W. S. Pitchford, D. S. Lines, M. J. Wilkes   +2 more
openaire   +1 more source

Performance, feed efficiency, feeding behavior, and cortisol concentration of lambs ranked for Residual Feed Intake and Residual Intake and Gain

Tropical Animal Health and Production
This study aimed to evaluate the performance, feed efficiency, feeding behavior, and cortisol concentrations of lambs ranked into different groups of Residual Feed Intake (RFI) and Residual Intake and Gain (RIG). Forty Santa Inês lambs with a mean initial age of 120 ± 30 days and mean initial (IBW) and final body weight (FBW) of 28.9 ± 3.2 and 43.7 ± 3.
Luiza Vage Coelho Sartori, Danielle Nunes Gurgeira, Charleni Crisóstomo, Claudia Cristina Paro de Paz, Josiel Ferreira, Ricardo Lopes Dias da Costa   +5 more
openaire   +2 more sources

Residual feed intake: a nutritional tool for genetic improvement

Tropical Animal Health and Production, 2013
The goal of this bibliographical study was to provide information about residual feed intake (RFI), a new criterion used in the selection of beef cattle for growth rate, food ingestion, and feed efficiency. RFI is calculated as the difference between real consumption and the quantity of food an animal is expected to eat based on its mean live weight ...
Leilson Rocha, Bezerra, José Lindenberg Rocha, Sarmento, Severino Gonzaga, Neto, Ney Rômulo Oliveira, de Paula, Ronaldo Lopes, Oliveira, Wagner Martins Fontes, do Rêgo   +5 more
openaire   +2 more sources

Molecular basis of residual feed intake in broilers

World's Poultry Science Journal, 2020
Understanding the expression of genes influencing low and high residual feed intake (RFI) is required to elucidate the basic molecular mechanism influencing feed efficiency.
Anand Prakash, Vishesh Kumar Saxena, Gandham Ravi Kumar, Simmi Tomar, Manish Kumar Singh   +4 more
openaire   +1 more source

Compilations and updates on residual feed intake in sheep

Tropical Animal Health and Production
The increasing global demand for food and the strong effect of climate change have forced animal science to advance regarding new methods of selection in search of more efficient animals in production systems. Feed consumption represents more than 70% of the costs of sheep farms, and more efficient animals can increase the farmers' profitability.
Josiel Ferreira, Alfonso Juventino Chay-Canul, Ignácio De Barbieri, Ricardo Lopes Dias da Costa   +3 more
openaire   +2 more sources