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Relationships Between Feed Efficiency and Meat Quality in Feedlot-Finished Nelore Cattle and Associations With the Muscle Tissue Proteome

ABSTRACT: Residual feed intake (RFI) as a measure of feed efficiency (FE) is an index that can help producers reduce costs by enabling the selection of more efficient and profitable cattle. However, the meat quality of these animals may be negatively impacted due to the lower subcutaneous fat deposition commonly observed in more efficient (low RFI) cattle. Traits such as tenderness, color, and juiciness may be affected by the reduced fat deposition, influencing consumers' purchasing decisions. Although low RFI cattle exhibit better FE in feedlot systems, few studies have described the molecular mechanisms regulating meat quality traits in these animals. Therefore, the objective of this project is to compare low RFI (efficient) and high RFI (inefficient) cattle finished in feedlots and to evaluate their meat quality in both physicochemical and molecular contexts. Comparing efficient and inefficient feedlot-finished cattle in terms of meat quality traits and identifying associations with the proteome of muscle tissue may contribute to a better understanding of the metabolic pathways that influence economically important characteristics in these animals.

INSTRUMENT(S): Q-Exactive (Thermo Fisher)

ORGANISM(S): Bos Indicus X Bos Taurus (ncbitaxon:30522)

SUBMITTER: Welder Angelo Baldassini Rafaela Cristina Rodrigues Daniela Alvarado Vesga Lucilene Delazari dos Santos

PROVIDER: MSV000097636 | MassIVE | Tue Apr 15 22:00:00 BST 2025

REPOSITORIES: MassIVE

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Project description:Improvement of feed efficiency would increase profitability of the poultry industries by decreasing the amount of feed required for production. Korat (KR) chicken is a new alternative meat-type chicken breed which its meat is recognized for its high protein, low fat and low purine content, whereas its low feed efficiency leads to high cost of production. Deeper understanding on how feed efficiency influences meat quality is poorly elucidated. To fulfill deeper understand molecular key that point the variation in feed efficiency and meat quality, the aim of this study was to investigate molecular pathways and genes involved in feed efficiency and meat quality in thigh of slow-growing KR chicken. A total of 75 males KR chicken were reared in individual cage until 10 weeks of age. Individual feed intake and body weight were collected weekly to calculate Feed Conversion Ratio (FCR) and Residual Feed Intake (RFI). Meat quality parameters were measured in thigh muscles such as ultimate pH (pHu), water-holding capacity (WHC), drip loss (DL), nucleotides content and several biomolecules (amide, …). Base on extreme values of FCR at 10 weeks of ages, 12 birds from the high FCR group (HFCR) and 9 birds from the low FCR group (LFCR) were selected for investigating their transcriptome using an 8×60K Agilent chicken microarray. In addition, a weighted gene coexpression network analysis was performed to detect the relationship between modules of co-expressed genes and feed efficiency, meat quality in thigh muscle. The result in this study indicated that selection on feed efficiency (FCR, RFI) would affect flavor precursor, lipid and protein content in thigh muscle. Based on WGCNA and functional enrichment analysis, results suggested that the key molecular pathways relate to FCR, RFI and meat quality (WHC, DL, IMP, AMP and inosine) in thigh muscle were the pathways of regulation of biological process, biological regulation and regulation of metabolic. Moreover, we revealed four genes there are assembly competence domain (ACD) gene, baculoviral IAP repeat containing 5 (BIRC5) gene, cytochrome c oxidase assembly factor 3 (COA3) gene and myosin light chain 9 (MYL9) gene that might be biomarker gene in feed efficiency and meat quality in thigh muscle. The hypothesis of the current study was alteration feed efficiency in slow-growing chicken will impact meat quality especially in term of texture and flavor.

Dataset Information

Relationships Between Feed Efficiency and Meat Quality in Feedlot-Finished Nelore Cattle and Associations With the Muscle Tissue Proteome

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