The effect of residual feed intake classification on forage intake by grazing beef cows

Journal of Animal Science
A M MeyerR L Kallenbach

Abstract

Although feed intake and efficiency differences in growing cattle of low and high residual feed intake (RFI) classification have been established, little is known about the difference in grazed forage intake between beef cows of known RFI classification. Two experiments were conducted using Hereford cows for which RFI had been determined as heifers using the GrowSafe 4000E feed intake system, after which heifers had been divided into thirds as low RFI, mid RFI, and high RFI. During Exp. 1, 2 replicates of low and high RFI cows (n = 7/replicate) in mid- to late-gestation were blocked to 1 of 4 non-endophyte-infected tall fescue paddocks (1.8 to 2.4 ha), which they grazed continuously for 84 d during summer. Using grazing exclosures, weekly rising plate meter readings, and forage harvests every 21 d, average forage DMI was calculated. Low and high RFI groups did not differ (P > 0.05) in BW change or BCS change over the trial (19.5 vs. 22.1 kg of BW gain and 0.11 vs. 0.10 BCS gain), but low RFI cows had a 21% numerically lower DMI than high RFI cows (12.4 vs. 15.6 kg/d; P = 0.23). The average area needed per paddock over the trial was similar for low and high RFI cows (1.71 vs. 1.82 ha; P = 0.35), and the average DM on offer over ...Continue Reading

Citations

Oct 4, 2012·Animal : an International Journal of Animal Bioscience·P LawrenceM McGee
Mar 1, 2012·Journal of Dairy Science·G C WaghornR J Spelman
Feb 27, 2015·Tropical Animal Health and Production·Luiz Fernando Costa e SilvaMário Fonseca Paulino
May 22, 2018·Animal : an International Journal of Animal Bioscience·D A KennyM McGee
Jan 25, 2013·Journal of Animal Science·D P Berry, J J Crowley
Jul 14, 2010·Journal of Animal Science·J D WulfhorstR A Hill
Jul 3, 2021·Animals : an Open Access Journal From MDPI·Cory T ParsonsDarrin L Boss
Aug 5, 2021·Translational Animal Science·Phillip A LancasterLarry V Cundiff

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