Feed efficiency and meat quality of crossbred beef heifers classified according to residual feed intake

This study aimed to evaluate feed efficiency and meat quality of 31 three-crossbred beef heifers during 84 days in a feedlot system. A 60:40 concentrate and sorghum silage ration on DM basis (ME = 2.73Mcal/kg of DM, CP = 11.90% DM) was fed ad libitum. Based on residual feed intake (RFI) calculations, the heifers were ranked in three groups of feed efficiency: High RFI (average mean = 0.776; n = 9), medium RFI (average mean = -0.010; n = 11), and low RFI (average mean = - 0.624; n = 11). High RFI heifers consumed 4.56% more DM per day than low RFI heifers (P 0.05) among RFI groups (1.40kg/day). No differences (P>0.05) were detected for digestibility of the nutrients: DM (64.00%), CP (60.01%), crude fat (72.90%), NDF (54.80%) and non-fibrous carbohydrate (NFC) (78.91%). There were no differences between low and high RFI groups for slaughter weight (475.00 vs. 479.55kg), hot carcass weight (259.09 vs. 261.44kg), Longissimus dorsi (LD) area (69.02 vs. 68.11 cm2), back-fat thickness (5.74 vs. 6.26 cm), shear force (5.45 vs. 5.19kg), sensorial traits of LD muscle, LD color (intensities L=40.47 a*=24.74 and b*=16.13) or commercial cuts yield. Low RFI heifers presented similar meat quality and carcass traits as high RFI heifers, however low RFI heifers consumed less DM (kg/d).

[1]  Bob Swick.  Recent Advances in Animal Nutrition in Australia, 2015 , 2016 .

[2]  M. Mercadante,et al.  Selection for feed efficiency traits and correlated genetic responses in feed intake and weight gain of Nellore cattle. , 2014, Journal of animal science.

[3]  G. Murdoch,et al.  Relationships among performance, residual feed intake, and product quality of progeny from Red Angus sires divergent for maintenance energy EPD. , 2012, Journal of animal science.

[4]  Y. Billon,et al.  Muscle characteristics and meat quality traits are affected by divergent selection on residual feed intake in pigs. , 2011, Journal of animal science.

[5]  J. Dekkers,et al.  Effects of selection for decreased residual feed intake on composition and quality of fresh pork. , 2011, Journal of animal science.

[6]  D. Riley,et al.  Effect of breed composition on phenotypic residual feed intake and growth in Angus, Brahman, and Angus x Brahman crossbred cattle. , 2009, Journal of animal science.

[7]  E. Detmann,et al.  Influência do tempo de incubação e do tamanho de partículas sobre os teores de compostos indigestíveis em alimentos e fezes bovinas obtidos por procedimentos in situ , 2008 .

[8]  A. Silveira,et al.  Efeito do grupo genético sobre as características de carcaça e maciez da carne fresca e maturada de bovinos superprecoces , 2007 .

[9]  R. Sainz,et al.  Growth, carcass quality, and protein and energy metabolism in beef cattle with different growth potentials and residual feed intakes. , 2007, Journal of animal science.

[10]  A. Silveira,et al.  Effect of genetic group on carcass traits and fresh and aged beef tenderness from young cattle , 2007 .

[11]  P. Kuber,et al.  Residual feed intake of purebred Angus steers: effects on meat quality and palatability. , 2006, Journal of animal science.

[12]  D. Keisler,et al.  The relationship between mitochondrial function and residual feed intake in Angus steers. , 2006, Journal of animal science.

[13]  S. Moore,et al.  Different measures of energetic efficiency and their phenotypic relationships with growth, feed intake, and ultrasound and carcass merit in hybrid cattle. , 2004, Journal of animal science.

[14]  J. Archer,et al.  Metabolic differences in Angus steers divergently selected for residual feed intake , 2004 .

[15]  E. Richardson,et al.  Biological basis for variation in residual feed intake in beef cattle. 2. Synthesis of results following divergent selection , 2004 .

[16]  R. Herd,et al.  Genetic variation in starch digestion in feedlot cattle and its association with residual feed intake , 2004 .

[17]  John A. Basarab,et al.  Residual feed intake and body composition in young growing cattle , 2003 .

[18]  V. Oddy,et al.  Meat quality and the calpain system of feedlot steers following a single generation of divergent selection for residual feed intake , 2001 .

[19]  S. Shackelford,et al.  Tenderness classification of beef: III. Effect of the interaction between end point temperature and tenderness on Warner-Bratzler shear force of beef longissimus. , 1999, Journal of animal science.

[20]  V. Oddy,et al.  Body composition explains only part of the intake difference between high and low efficiency Angus steers. , 1999 .

[21]  L. P. Johnson,et al.  A comparison of Warner-Bratzler shear force assessment within and among institutions. , 1997, Journal of animal science.

[22]  D. E. Goll,et al.  Is Z-disk degradation responsible for postmortem tenderization? , 1995, Journal of animal science.

[23]  M. Koohmaraie,et al.  Muscle proteinases and meat aging. , 1994, Meat science.

[24]  A. J. Regazzi.  Teste para verificar a identidade de modelos de regressão , 1993 .

[25]  P. V. Soest,et al.  A net carbohydrate and protein system for evaluating cattle diets: II. Carbohydrate and protein availability. , 1992, Journal of animal science.

[26]  J. B. Robertson,et al.  Systems of analysis for evaluating fibrous feeds , 1979 .

[27]  Robert M. Koch,et al.  Efficiency of Feed Use in Beef Cattle , 1963 .

[28]  O. G. Hankins,et al.  Estimation of the Composition of Beef Carcasses and Cuts , 1946 .