Effects of selection for ultrasound intramuscular fat percentage in Angus bulls on carcass traits of progeny

2002 ◽  
Vol 80 (8) ◽  
pp. 2017 ◽  
Author(s):  
R. L. Sapp ◽  
J. K. Bertrand ◽  
T. D. Pringle ◽  
D. E. Wilson
Keyword(s):  
Carcass Traits ◽  
Intramuscular Fat ◽  
Fat Percentage ◽  
Selection For

Effects of selection for ultrasound intramuscular fat percentage in Angus bulls on carcass traits of progeny1,2

2002 ◽  
Vol 80 (8) ◽  
pp. 2017-2022
Author(s):  
R. L. Sapp ◽  
J. K. Bertrand ◽  
T. D. Pringle ◽  
D. E. Wilson
Keyword(s):  
Carcass Traits ◽  
Intramuscular Fat ◽  
Fat Percentage ◽  
Selection For

Phenotypic and genetic associations between feeding behavior and carcass merit in crossbred growing cattle

2021 ◽  
Vol 99 (12) ◽  
Author(s):  
David N Kelly ◽  
Roy D Sleator ◽  
Craig P Murphy ◽  
Stephen B Conroy ◽  
Donagh P Berry
Keyword(s):  
Feeding Behavior ◽  
Energy Intake ◽  
Carcass Traits ◽  
Genetic Correlations ◽  
Intramuscular Fat ◽  
Carcass Weight ◽  
Genetic Associations ◽  
Fat Percentage ◽  
Growing Cattle ◽  
Carcass Merit

Abstract In growing cattle, the phenotypic and genetic relationships between feeding behavior and both live animal ultrasound measures and subsequent carcass merit are generally poorly characterized. The objective of the current study was to quantify the phenotypic and genetic associations between a plethora of feeding behavior traits with both pre-slaughter ultrasound traits and post-slaughter carcass credentials in crossbred Bos taurus cattle. Carcass data were available on 3,146 young bulls, steers, and heifers, of which 2,795 and 2,445 also had records for pre-slaughter ultrasound muscle depth and intramuscular fat percentage, respectively; a total of 1,548 steers and heifers had information on all of the feeding behavior, ultrasound, and carcass traits. Young bulls were fed concentrates, while steers and heifers were fed a total mixed ration. Feeding behavior traits were defined based on individual feed events or meal events (i.e., individual feed events grouped into meals). Animal linear mixed models were used to estimate (co)variance components. Phenotypic correlations between feeding behavior and both ultrasound and carcass traits were generally weak and not different from zero, although there were phenotypic correlations of 0.40, 0.26, and 0.37 between carcass weight and feeding rate, energy intake per feed event, and energy intake per meal, respectively. Genetically, cattle that had heavier carcass weights, better carcass conformation, or a higher dressing percentage fed for a shorter time per day (genetic correlations [±SE] of −0.46 ± 0.12, −0.39 ± 0.11, and −0.50 ± 0.10, respectively). Genetic correlations of 0.43 ± 0.12 and 0.68 ± 0.13 were estimated between dressing difference (i.e., differential between live weight pre-slaughter and carcass weight) and energy intake per feed event and energy intake per meal, respectively. Neither intramuscular fat percentage measured on live animals nor carcass fat score (i.e., a measure of subcutaneous fat cover of the carcass) was genetically associated with any of the feeding behavior traits. The genetic associations between some feeding behavior traits and both ultrasound and carcass traits herein suggested that indirect responses in the feeding behavior of growing cattle from selection for improved carcass merit would be expected. Such changes in feeding behavior patterns in cattle may be reduced by measuring and including feeding behavior in a multiple-trait selection index alongside carcass traits.

scholarly journals Effects of balanced selection for intramuscular fat and abdominal fat percentage and estimates of genetic parameters

2017 ◽  
Vol 96 (2) ◽  
pp. 282-287 ◽  
Author(s):  
M. Jiang ◽  
W.L. Fan ◽  
S.Y. Xing ◽  
J. Wang ◽  
P. Li ◽  
...  
Keyword(s):  
Genetic Parameters ◽  
Intramuscular Fat ◽  
Abdominal Fat ◽  
Fat Percentage ◽  
Selection For

Effects of Divergent Selection for Growth on Carcass Traits in Japanese Quails

2014 ◽  
Vol 42 (2) ◽  
pp. 51-56
Author(s):  
Khairy M. El–Bayomi ◽  
Mahmoud S. El-Tarabany ◽  
Mohammed A.F. Nasr ◽  
El-Shimaa M. Roushdy
Keyword(s):  
Carcass Traits ◽  
Divergent Selection ◽  
Japanese Quails ◽  
Selection For

Selection against abdominal fat percentage may increase intramuscular fat content in broilers

2016 ◽  
Vol 133 (5) ◽  
pp. 422-428 ◽  
Author(s):  
L. Leng ◽  
H. Zhang ◽  
J.Q. Dong ◽  
Z.P. Wang ◽  
X.Y. Zhang ◽  
...  
Keyword(s):  
Intramuscular Fat ◽  
Abdominal Fat ◽  
Fat Content ◽  
Fat Percentage ◽  
Intramuscular Fat Content

Impact of dietary supplementation with a synbiotic, organic acids or their combination on growth performance, carcass traits, economic efficiency, jejunum histomorphometry and some blood indices of broiler chickens

2019 ◽  
Vol 59 (7) ◽  
pp. 1318 ◽  
Author(s):  
Ayman S. Salah ◽  
Mahmoud S. El-Tarabany ◽  
Mohamed A. Ali
Keyword(s):  
Organic Acids ◽  
Growth Performance ◽  
Carcass Traits ◽  
Dietary Supplementation ◽  
Control Group ◽  
Cost Ratio ◽  
Feed Conversion ◽  
Fat Percentage ◽  
Blood Indices ◽  
Blood Constituents

The objective was to explore the possible impacts of dietary supplementation with a synbiotic, organic acids or their combination on the growing efficiency, carcass traits and some blood constituents in broilers. In total, 160 1-day-old male broilers (Ross 308) were randomly assigned into four equal groups (40 birds with 8 replicates). The control group received the basal diet with no supplements, while diets of the treated groups were supplemented with organic acids (OA; 1 g/kg), a synbiotic (S; 1 g/kg) and an equal mix of OA and the synbiotic (OS; 2 g/kg). The dietary supplementation with OA decreased the feed intake (P = 0.011) and bodyweight gain (P = 0.011) when compared with other experimental groups. However, the dietary supplementation with the synbiotic plus OA resulted in a considerable improvement in the overall feed conversion rate when compared with the control and OA-supplemented groups (P = 0.001). Groups fed the diets supplemented with the synbiotic or the synbiotic plus OA showed significantly higher net profits and the profit to cost ratio than did the CON and OA-supplemented groups (P = 0.010 and 0.005 respectively). Birds in the S and OS groups had a significantly higher jejunum villus height (P = 0.001), and carcass (P = 0.012) and breast meat (P = 0.001) yields than did those in the control and OA groups. However, the synbiotic-supplemented group produced significantly lower abdominal fat percentage (P = 0.021). The dietary supplementation with the synbiotic or the synbiotic plus OA decreased the lymphocyte counts (P = 0.003) and the serum reduced glutathione concentration (P = 0.001), but significantly decreased the heterophil to lymphocyte ratio (P = 0.001), and the serum cholesterol (P = 0.014) and oxidised glutathione (P = 0.002) concentrations compared with the control and OA-supplemented groups. The present findings showed that dietary supplementation with a synbiotic or a synbiotic plus OA can improve the growth performance, carcass traits, serum antioxidant activity and blood-related indices in broilers.

scholarly journals The relationship between the rumen microbiome and carcass merit in Angus steers

2020 ◽  
Vol 98 (9) ◽  
Author(s):  
Taylor R Krause ◽  
Jeferson M Lourenco ◽  
Christina B Welch ◽  
Michael J Rothrock ◽  
Todd R Callaway ◽  
...  
Keyword(s):  
Lipid Content ◽  
Metabolic Pathways ◽  
Carcass Traits ◽  
Subcutaneous Fat ◽  
Intramuscular Fat ◽  
Rrna Gene ◽  
Marbling Score ◽  
Microbial Composition ◽  
Fat Depots ◽  
Rumen Microbiome

Abstract The objective of this study was to explore the relationships between ruminal microbial populations from Angus steers that were divergent in carcass traits related to adipose accumulation. Twenty-four feedlot-finished Angus steers (age: 538 ± 21 d; body weight following lairage: 593.9 ± 43.7 kg) were slaughtered, and ruminal contents and carcass data were collected. Ruminal microbial deoxyribonucleic acid (DNA) extraction and 16S ribosomal ribonucleic acid (rRNA) gene sequencing were performed to determine microbial relative abundances, to estimate microbial diversity, and to predict microbial metabolic pathways. A variety of correlation analyses and one-way ANOVA were performed to investigate the relationships between the rumen microbiome and carcass traits. Marbling score (P = 0.001) and longissimus lipid content (P = 0.009) were positively correlated to Chao1 Richness Index, suggesting that increased intramuscular fat was associated with increased numbers of ruminal microbial species. The phyla Tenericutes and TM7 were negatively correlated (P ≤ 0.05) to marbling score and longissimus lipid content, indicating that lower abundances of these phyla may be associated with improvements in intramuscular fat content. Greater abundance of the bacterial family S24-7 was positively correlated (P = 0.002) to marbling score. Analysis by marbling classification revealed further linkages to microbial richness (P ≤ 0.063), diversity (P = 0.044), and S24-7 (P < 0.001) populations. Computational prediction of the microbial metabolic pathways revealed no differences (P ≥ 0.05) in metabolic pathway expression in rumen microbes between steers in the high- and low-marbling classes. Several phyla, families, and genera were positively correlated (P ≤ 0.05) to both rib fat thickness and yield grade. Collectively, our results suggest that microbial composition is associated to differing performance in carcass adipose traits. Overall, most of the bacterial taxa correlated to the intramuscular and subcutaneous fat depots did not overlap, suggesting the microbial population end products likely impacted adipose accumulation largely via separate adipogenic pathways of the host animal.

scholarly journals Correlated Responses to Selection for Increased Intramuscular Fat in a Chinese Quality Chicken Line

2007 ◽  
Vol 86 (11) ◽  
pp. 2309-2314 ◽  
Author(s):  
G.P. Zhao ◽  
J.L. Chen ◽  
M.Q. Zheng ◽  
J. Wen ◽  
Y. Zhang
Keyword(s):  
Intramuscular Fat ◽  
Correlated Responses ◽  
Chicken Line ◽  
Selection For
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