Relationship between residual feed intake and end product palatability in longissimus steaks from steers sired by Angus bulls divergent for intramuscular fat expected progeny difference

Ahola, J. K.; Skow, T. A.; Hunt, C. W.; Hill, Rodney A.

doi:10.15232/s1080-7446(15)30456-3

Cited by 23 publications

(20 citation statements)

References 12 publications

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“…In the current study there were no differences between LRFI and HRFI steers in yield grade, ribeye area, subcutaneous adipose tissue mass as measured by backfat or intramuscular fat deposition as measured by marbling score. These results are consistent with several studies that did not find a significant correlation between RFI and these traits (Carstens et al, 2002;Schenkel et al, 2004;Baker et al, 2006;Nkrumah et al, 2007;Ahola et. al., 2011).…”

Section: Discussionsupporting

confidence: 93%

“…While measures of tenderness or palatability were not recorded in the current study, the few studies that have addressed these parameters indicated that RFI has little impact on Warner-Bratzler Shear Force and sensory panel outcomes consistent with the lack of evidence for an association between RFI and meat quality that was observed in the current study (McDonagh et. al., 2001;Ahola et al, 2011).…”

Section: Discussionmentioning

confidence: 99%

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Residual feed intake studies in Angus-sired cattle reveal a potential role for hypothalamic gene expression in regulating feed efficiency1,2

Perkins

Key

Garrett

et al. 2014

Journal of Animal Science

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Mechanisms underlying variation in residual feed intake (RFI), a heritable feed efficiency measure, are poorly understood while the relationship between RFI and meat quality is uncertain. To address these issues, 2 divergent cohorts consisting of High (HRFI) and Low (LRFI) RFI individuals were created by assessing RFI in 48 Angus-sired steers during a 70 d feeding trial to identify steers with divergent RFI. The association of RFI with indices of meat quality and expression of genes within hypothalamic and adipose tissue was then determined in LRFI and HRFI steers. While on test, feed intake was recorded daily with BW and hip heights recorded at 14 d intervals. Ultrasound measurements of rib eye area (REA) and backfat (BF) were recorded initially and before harvest. Carcass and growth data were analyzed using a mixed model with RFI level (LRFI, HRFI) as the independent variable. The least-square means (lsmeans) for RFI were -1.25 and 1.51 for the LRFI and HRFI cohorts (P < .0001). Dry matter intake was higher for the HRFI individuals versus the LRFI steers (P < .0001) while on test BW gain was not different between the 2 groups (P < 0.73). There were no differences detected in marbling score (P < 0.93), BF (P < 0.61), REA (P < 0.15), yield grade (P < 0.85) or objective Hunter color measures between LRFI and HRFI steers indicating that there was no relationship between RFI and meat quality. Neuropeptide-Y (NPY), relaxin-3 (RLN3), melanocortin 4 receptor (MC4R), and GnRH mRNA expression was 64%, 59%, 58%, 86% lower (P < 0.05), respectively, while gonadotropin inhibiting hormone (GnIH) and pro-opiomelanocortin (POMC) mRNA expression was 198% and 350% higher (P < 0.01) in the arcuate nucleus of LRFI steers. Expression of agouti-related protein (AGRP), relaxin/insulin-like family peptide receptor 1 (RXFP1), and melanocortin 3 receptor mRNA was similar between LRFI and HRFI animals. Pituitary expression of FSHβ (P < 0.03) and LHβ (P < 0.01) was correlated to hypothalamic GnRH levels suggesting that changes in gene expression within the arcuate nucleus had functional consequences. Leptin mRNA expression was 245% higher in the adipose tissue of LRFI steers consistent with lower levels of NPY and higher expression of POMC in their hypothalami. These data support the hypothesis that differences in hypothalamic neuropeptide gene expression underlie variation in feed efficiency in steers while the gonadotropin axis may also influence feed efficiency.

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Section: Discussionsupporting

confidence: 93%

Section: Discussionmentioning

confidence: 99%

Residual feed intake studies in Angus-sired cattle reveal a potential role for hypothalamic gene expression in regulating feed efficiency1,2

Perkins

Key

Garrett

et al. 2014

Journal of Animal Science

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“…The mean RFI of the most efficient and the least efficient group of animals was -1.10kg DM day -1 and +0.97kg DM day -1 , respectively, making a total difference of 2.07kg DM day -1 between the groups. This difference was larger than that found by Ahola et al (2011) in their evaluation of Angus steers, in which RFI values between efficiency groups ranged from -0.69 to +0.62kg DM day -1 , a difference of 1.31kg DM day -1 . The difference was also larger than the values found by Gomes et al (2012) in their comparison of groups of high-and low-efficiency Nellore steers, in which values ranged from -0.97 to +0.81kg DM day -1 , a variation of 1.78kg DM day -1 .…”

Section: Resultscontrasting

confidence: 62%

“…Santana et al (2012) also found no significant differences in these indices, and noted the absence of any phenotypic correlation between this efficiency measure and such performance indices, as also observed by Basarab et al (2003) and Ahola et al (2011), indicating these variables are independent of each other. The results obtained corroborate the statements of Koch et al (1963), Arthur et al (2001) and Basarab et al (2003) that RFI is phenotypically independent of the traits of live weight and weight gain, and selects for lowintake animals.…”

Section: Resultsmentioning

confidence: 89%

Relationships between residual feed intake and feedlot performance, profitability, and carcass traits in Brahman cattle

Favero

Mizubuti

Gomes

et al. 2018

Arq. Bras. Med. Vet. Zootec.

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The present study aimed to evaluate the feedlot performance, profitability and carcass traits of Brahman bulls classified according to the residual feed intake (RFI). Twenty-four bulls (19-month old, 370±34kg live weight) were housed in individual pens for 54 days and had the daily feed intake (observed dry matter intake, DMI obs ; DMI % live weight, LW) and average daily gain (ADG) measured. Ultrasound carcass evaluations were performed at the initial and final weighings, when measurements were taken of Longissimus dorsi area, ratio, Longissimus and Biceps femoris fat thickness. The animals were ranked and divided into high (>+0.5 standard deviation; SD), medium (between ±0.5 SD from the mean), and low (<-0.5 SD) RFI groups. Low-RFI animals had lower DMI obs (P<0.10) and DMI % LW (P<0.05). No significant differences in initial and final weight or ADG were noticed (P>0.05). Low-RFI animals showed lower weight gain cost and higher daily profit (P<0.05). Carcass traits were similar between groups, regardless of evaluation date (P>0.05). Selection for RFI lead to animals with lower feed intake without affecting weight gain or carcass traits, thereby providing increased profitability for beef cattle farming.Keywords: Bos indicus, feed conversion ratio, musculature, phenotype RESUMO Objetivou-se avaliar o desempenho, o lucro e as características de carcaça de tourinhos Brahman classificados de acordo com o consumo alimentar residual (CAR). Vinte e quatro tourinhos (19 meses de idade e 370±34kg de peso vivo) foram alojados em baias individuais por 54 dias para avaliação do consumo de alimentos (CMS obs ; CMS % peso vivo, PV) e ganho de peso diário (GMD). Avaliações de carcaça por ultrassonografia foram realizadas nas pesagens inicial e final, com mensurações da área do

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“…A more diverse microbiota was previously correlated with feed inefficiency, resulting in significantly more complex metabolites produced by various functional pathways [43,44]. Previous studies also suggested an association between the marbling score and an inefficient microbiome [45][46][47]. However, other studies observed no differences in marbling scores across different feed efficiency groups of beef cattle [48,49].…”

Section: Discussionmentioning

confidence: 99%

Association between Rumen Microbiota and Marbling Score in Korean Native Beef Cattle

Kim

Park

Jeong

et al. 2020

Animals

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This study demonstrated the potential effects of the rumen microbiota on the deposition of intramuscular fat, known as marbling. Previous studies on fatty acid metabolism in beef cattle have mostly focused on biohydrogenating rumen bacteria, whereas those on the overall rumen microbiota—to understand their roles in marbling—have not been systematically performed. The rumen microbiota of 14 Korean beef cattle (Hanwoo), which showed similar carcass characteristics and blood metabolites but different marbling scores, were analyzed by 16S rRNA gene sequencing. The rumen samples were grouped into two extreme marbling score groups of host animals as follows: LMS, marbling score≤ 4 or HMS, marbling score ≥7. Species richness tended to be higher in the HMS group, whereas the overall microbiota differed between LMS and HMS groups. RFP12, Verrucomicrobia, Oscillospira, Porphyromonadaceae, and Paludibacter were differentially abundant in the HMS group, whereas Olsenella was abundant in the LMS group. Some marbling-associated bacterial taxa also contributed to the enrichment of two lipid metabolic pathways including “alpha-linolenic acid metabolism” and “fatty acid biosynthesis” in the HMS microbiome. Taxonomic drivers of fatty acid biosynthesis, particularly in the rumen microbiome of high-marbled meat, could thus be further studied to increase the intramuscular fat content.

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Relationship between residual feed intake and end product palatability in longissimus steaks from steers sired by Angus bulls divergent for intramuscular fat expected progeny difference

Cited by 23 publications

References 12 publications

Residual feed intake studies in Angus-sired cattle reveal a potential role for hypothalamic gene expression in regulating feed efficiency1,2

Residual feed intake studies in Angus-sired cattle reveal a potential role for hypothalamic gene expression in regulating feed efficiency1,2

Relationships between residual feed intake and feedlot performance, profitability, and carcass traits in Brahman cattle

Association between Rumen Microbiota and Marbling Score in Korean Native Beef Cattle

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