The objective was to determine the extent to which feeding low-energy, high-fiber (LEHF) and high-energy, low-fiber (HELF) diets impacts meat quality and carcass composition of pigs divergently selected for residual feed intake (RFI). Two experiments were conducted in the divergently selected Iowa State University RFI lines: Exp. 1 evaluated carcasses of generation (G) 8 pigs fed on commercial ...

The evaluation of sheep feed intake (FI) in efficiency tests is expensive. Decreasing the test period could be a resource-saving tool by reducing cost evaluating each animal and allowing to greater number animals per year. For this reason, objective research was explore residual (RFI) models decreasing duration. Data collected from 286 Australian Merino three performed trials, consisted 56 days...

Context It has been indicated that there might be an antagonism between selection for gastrointestinal nematode resistance and high productivity feed conversion efficiency in ruminants. Aims This study aimed to determine whether genetic nematodes would alter the intake of sheep with or without infection Haemonchus contortus. Methods Sixty-seven Corriedale lambs (357 ± 14 days old) derived from ...

Predicting dry matter intake (DMI) and feed efficiency by leveraging the use of data streams available on farm could aid efforts to improve dairy cattle. Residual (RFI) is difference between predicted observed after accounting for body size, weight change, milk production, making it a valuable metric research. Our objective was develop evaluate DMI RFI prediction models using multiple linear re...

Fractionation of N isotopes occurs in many metabolic reactions which causes tissue proteins to become enriched in ¹⁵N while urea (urine) is depleted in ¹⁵N relative to the diet. We investigated ¹⁵N enrichment of whole plasma and its relationship with feed conversion efficiency (FCE) in growing beef heifers (n 84) offered 2 kg/d of concentrates with grass silage ad libitum. Heifers were on avera...

Empty body and carcass chemical compositions, expressed as content of water, ether extract, protein, minerals, and energy, were evaluated in Nellore bulls with different residual feed intakes (RFI). Forty-nine not castrated males, with 343 kg of average initial BW and 398 kg of average slaughter BW, were studied. Animals were divided in two subgroups: reference group (RG) and ad libitum feeding...

We estimated the genetic parameters related to feed intake (FI), feed efficiency traits (including feed conversion ratio (FCR) and residual feed intake (RFI) of digestible crude protein (DCP) and total digestible nutrients (TDN)), beef marbling score (BMS), melting point of fat (MP) and fatty acid composition. Fat and meat (Musculus trapezius) samples were taken from the carcasses of 863 Japane...

The objective of this study was to identify genomic regions and metabolic pathways associated with dry matter intake, average daily gain, feed efficiency and residual feed intake in an experimental Nellore cattle population. The high-density SNP chip (Illumina High-Density Bovine BeadChip, 777k) was used to genotype the animals. The SNP markers effects and their variances were estimated using t...