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Lisuzzo A, Mazzotta E, Cappelli G, Martucciello A, Monteiro BM, Sales JNS, Di Vuolo G, De Donato I, Schiavo L, De Carlo E, Rossi P, Contiero B, Fiore E, Vecchio D. Biochemical profile differences during the transition period based on different levels of non-esterified fatty acids at 7 weeks before parturition in Mediterranean Italian dairy buffaloes ( Bubalus bubalis). Front Vet Sci 2024; 11:1404041. [PMID: 39015111 PMCID: PMC11250106 DOI: 10.3389/fvets.2024.1404041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2024] [Accepted: 05/31/2024] [Indexed: 07/18/2024] Open
Abstract
Metabolic adaptations to negative energy balance, as well as lipomobilization, influence inflammatory responses, immune function, and oxidative stress in animals. This study aimed to evaluate the biochemical profile of Mediterranean buffaloes with different levels of lipomobilization from the prepartum to the postpartum period. A total of 76 Mediterranean buffaloes were enrolled, and a weekly blood sample was taken from 7 weeks before to 6 weeks after calving. The concentration of non-esterified fatty acids (NEFAs) was determined in serum and was used to categorize buffaloes into three lipomobilization groups 7 weeks before calving: mild (NEFA-I; NEFA ≤ 0.29 mEq/L; n = 18), medium (NEFA-II; 0.29 < NEFA < 0.57 mEq/L; n = 20), and severe (NEFA-III; NEFA ≥ 0.57 mEq/L; n = 38). Two-way repeated measures ANOVA was used to assess changes within and between the groups and over time. Significant differences were found in the concentration levels of NEFA, β-hydroxybutyrate, glucose, cholesterol, protein profile, oxygen radicals, antioxidants, lysozyme, complement, and minerals. These results suggest that both medium and severe lipomobilization groups are associated with metabolic alterations. In conclusion, buffaloes with higher NEFA levels (>0.29 mEq/L; NEFA-II and NEFA-III) at 7 weeks before calving should be monitored more closely to reduce the risk of metabolic diseases. Furthermore, the medium (NEFA-II) and severe (NEFA-III) lipomobilization groups could be associated with differences in the animals' ability to manage their metabolic status. Specifically, the severe mobilization group was most associated with a greater energy deficit during both the prepartum and postpartum periods without oxidative stress. On the contrary, the medium mobilization group was associated with a less severe energy deficit but was also associated with an inflammatory status and oxidative stress during the prepartum period. These distinctions highlight the need for tailored management strategies to address varying levels of metabolic stress in dairy buffaloes.
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Affiliation(s)
- Anastasia Lisuzzo
- Department of Animal Medicine, Production, and Health, University of Padova, Legnaro, PD, Italy
| | - Elisa Mazzotta
- Department of Animal Medicine, Production, and Health, University of Padova, Legnaro, PD, Italy
- Istituto Zooprofilattico Sperimentale delle Venezie, Legnaro, PD, Italy
| | - Giovanna Cappelli
- Istituto Zooprofilattico Sperimentale del Mezzogiorno, National Reference Center on Water Buffalo Farming and Productions Hygiene and Technologies (CReNBuf), Portici, Italy
| | - Alessandra Martucciello
- Istituto Zooprofilattico Sperimentale del Mezzogiorno, National Reference Center on Water Buffalo Farming and Productions Hygiene and Technologies (CReNBuf), Portici, Italy
| | - Bruno Moura Monteiro
- Institute of Animal Health and Production (ISPA), Federal Rural University of the Amazon (UFRA), Belém, PD, Brazil
| | | | - Gabriele Di Vuolo
- Istituto Zooprofilattico Sperimentale del Mezzogiorno, National Reference Center on Water Buffalo Farming and Productions Hygiene and Technologies (CReNBuf), Portici, Italy
| | - Immacolata De Donato
- Istituto Zooprofilattico Sperimentale del Mezzogiorno, National Reference Center on Water Buffalo Farming and Productions Hygiene and Technologies (CReNBuf), Portici, Italy
| | - Lorena Schiavo
- Istituto Zooprofilattico Sperimentale del Mezzogiorno, National Reference Center on Water Buffalo Farming and Productions Hygiene and Technologies (CReNBuf), Portici, Italy
| | - Esterina De Carlo
- Istituto Zooprofilattico Sperimentale del Mezzogiorno, National Reference Center on Water Buffalo Farming and Productions Hygiene and Technologies (CReNBuf), Portici, Italy
| | - Pasquale Rossi
- Sud Rienergy Agricultural Society S.r.l., Corigliano Calabro, Italy
| | - Barbara Contiero
- Department of Animal Medicine, Production, and Health, University of Padova, Legnaro, PD, Italy
| | - Enrico Fiore
- Department of Animal Medicine, Production, and Health, University of Padova, Legnaro, PD, Italy
| | - Domenico Vecchio
- Istituto Zooprofilattico Sperimentale del Mezzogiorno, National Reference Center on Water Buffalo Farming and Productions Hygiene and Technologies (CReNBuf), Portici, Italy
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Missio D, Leivas FG, Cibin F, Emanuelli T, Somacal S, Buss V, Gasperin B, Oliveira DED, Gonçalves PBD, Ferreira R. Vitamin E reduces the reactive oxygen species production in dominant follicle during the negative energy balance in cattle. Reprod Domest Anim 2023; 58:1662-1671. [PMID: 37743826 DOI: 10.1111/rda.14481] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2023] [Revised: 09/07/2023] [Accepted: 09/14/2023] [Indexed: 09/26/2023]
Abstract
In the postpartum period, there is an increase in non-esterified fatty acids (NEFA) in both serum and follicular fluid (FF) of cattle. The increase in fatty acid concentration results in increased production of reactive oxygen species (ROS) that can compromise bovine fertility. The objectives of this study were to characterize the lipid profile found in the FF of cows experiencing induced negative energy balance (NEB) and to evaluate the effect of α-tocopherol in the prevention of oxidative stress in the serum and FF of cows. Twenty-nine beef cows were divided into groups: (1) control; (2) Fasting for 24 days; and (3) Fasting + VitE. Between D0 and D4 blood samples were taken to assess concentrations of NEFA, ROS production, total antioxidant capacity (FRAP), lipid peroxidation, and α-tocopherol (vitamin E). On D4, follicular aspiration was performed for analysis of FF from the dominant follicle. Our results demonstrate that fasting was effective in causing increased fat mobilization in animals. The increase in serum concentration of C18:1c9 was reflected in the FF of fasting cows. Serum α-tocopherol concentration was higher in the control and Fasting + VitE groups compared to the Fasting group. In FF, there was an increase of α-tocopherol in the Fasting + VitE group in comparison to Fasting cows. There was an increase in ROS production in the serum of fasting cows. ROS production in FF was higher in the Fasting compared to the Fasting + VitE group. Vitamin E has beneficial effects in reducing ROS production in the dominant follicle of cows in NEB.
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Affiliation(s)
- Daniele Missio
- Laboratory of Biotechnology of Reproduction, Federal University of Santa Maria, Santa Maria, Brazil
| | - Fabio Gallas Leivas
- Laboratory of Biotechnology of Reproduction, BIOTECH, Federal University of Pampa, Uruguaiana, Brazil
| | - Francielli Cibin
- Laboratory of Biotechnology of Reproduction, BIOTECH, Federal University of Pampa, Uruguaiana, Brazil
| | - Tatiana Emanuelli
- Department of Alimentary Technology and Science, Federal University of Santa Maria, Santa Maria, Brazil
| | - Sabrina Somacal
- Department of Alimentary Technology and Science, Federal University of Santa Maria, Santa Maria, Brazil
| | - Vanessa Buss
- Laboratory of Biotechnology of Reproduction, BIOTECH, Federal University of Pampa, Uruguaiana, Brazil
| | - Bernardo Gasperin
- Department of Animal Pathology, Federal University of Pelotas, Capão do Leão, Brazil
| | | | | | - Rogério Ferreira
- Department of Animal Science, Santa Catarina State University, Chapecó, Brazil
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Meng S, Zhang Y, Lv S, Zhang Z, Liu X, Jiang L. Comparison of muscle metabolomics between two Chinese horse breeds. Front Vet Sci 2023; 10:1162953. [PMID: 37215482 PMCID: PMC10196265 DOI: 10.3389/fvets.2023.1162953] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2023] [Accepted: 04/03/2023] [Indexed: 05/24/2023] Open
Abstract
With their enormous muscle mass and athletic ability, horses are well-positioned as model organisms for understanding muscle metabolism. There are two different types of horse breeds-Guanzhong (GZ) horses, an athletic breed with a larger body height (~148.7 cm), and the Ningqiang pony (NQ) horses, a lower height breed generally used for ornamental purposes-both inhabited in the same region of China with obvious differences in muscle content. The main objective of this study was to evaluate the breed-specific mechanisms controlling muscle metabolism. In this study, we observed muscle glycogen, enzyme activities, and LC-MS/MS untargeted metabolomics in the gluteus medius muscle of six, each of GZ and NQ horses, to explore differentiated metabolites that are related to the development of two muscles. As expected, the glycogen content, citrate synthase, and hexokinase activity of muscle were significantly higher in GZ horses. To alleviate the false positive rate, we used both MS1 and MS2 ions for metabolite classification and differential analysis. As a result, a total of 51,535 MS1 and 541 MS2 metabolites were identified, and these metabolites can separate these two groups from each other. Notably, 40% of these metabolites were clustered into lipids and lipid-like molecules. Furthermore, 13 significant metabolites were differentially detected between GZ and NQ horses (fold change [FC] value ≥ 2, variable important in projection value ≥1, and Q value ≤ 0.05). They are primarily clustered into glutathione metabolism (GSH, p = 0.01), taurine, and hypotaurine metabolism (p < 0.05) pathways. Seven of the 13 metabolites were also found in thoroughbred racing horses, suggesting that metabolites related to antioxidants, amino acids, and lipids played a key role in the development of skeleton muscle in horses. Those metabolites related to muscle development shed a light on racing horses' routine maintenance and improvement of athletic performance.
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Affiliation(s)
- Sihan Meng
- Laboratory of Animal (Poultry) Genetics Breeding and Reproduction, Ministry of Agriculture, Institute of Animal Science, Chinese Academy of Agricultural Sciences (CAAS), Beijing, China
| | - Yanli Zhang
- Laboratory of Animal (Poultry) Genetics Breeding and Reproduction, Ministry of Agriculture, Institute of Animal Science, Chinese Academy of Agricultural Sciences (CAAS), Beijing, China
| | - Shipeng Lv
- College of Animal Science, Xinjiang Agricultural University, Urumqi, China
| | - Zhengkai Zhang
- CAAS-ILRI Joint Laboratory on Livestock and Forage Genetic Resources, Institute of Animal Science, Chinese Academy of Agricultural Sciences (CAAS), Beijing, China
| | - Xuexue Liu
- Laboratory of Animal (Poultry) Genetics Breeding and Reproduction, Ministry of Agriculture, Institute of Animal Science, Chinese Academy of Agricultural Sciences (CAAS), Beijing, China
- Centre d'Anthropobiologie et de Génomique de Toulouse, Université Paul Sabatier, Toulouse, France
| | - Lin Jiang
- Laboratory of Animal (Poultry) Genetics Breeding and Reproduction, Ministry of Agriculture, Institute of Animal Science, Chinese Academy of Agricultural Sciences (CAAS), Beijing, China
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Fiore E, Lisuzzo A, Laghi L, Harvatine KJ, Mazzotta E, Alterisio MC, Ciaramella P, Zhu C, Contiero B, Faillace V, Guccione J. Serum metabolomics assessment of etiological processes predisposing ketosis in water buffalo during early lactation. J Dairy Sci 2023; 106:3465-3476. [PMID: 36935234 DOI: 10.3168/jds.2022-22209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2022] [Accepted: 11/23/2022] [Indexed: 03/19/2023]
Abstract
Metabolic disorders as ketosis are manifestations of the animal's inability to manage the increase in energy requirement during early lactation. Generally, buffaloes show a different response to higher metabolic demands than other ruminants with a lower incidence of metabolic problems, although ketosis is one of the major diseases that may decrease the productivity in buffaloes. The aim of this study was to characterize the metabolic profile of Mediterranean buffaloes (MB) associated with 2 different levels of β-hydroxybutyrate (BHB). Sixty-two MB within 50 days in milk (DIM) were enrolled and divided into 2 groups according to serum BHB concentration: healthy group (37 MB; BHB <0.70 mmol/L; body condition score: 5.00; parity: 3.78; and DIM: 30.70) and group at risk of hyperketonemia (25 MB; BHB ≥0.70 mmol/L; body condition score: 4.50; parity: 3.76; and DIM: 33.20). The statistical analysis was conducted by one-way ANOVA and unpaired 2-sample Wilcoxon tests. Fifty-seven metabolites were identified and among them, 12 were significant or tended to be significant. These metabolites were related to different metabolic changes such as mobilization of body resources, ruminal fermentations, urea cycle, thyroid hormone synthesis, inflammation, and oxidative stress status. These findings are suggestive of metabolic changes related to subclinical ketosis status that should be further investigated to better characterize this disease in the MB.
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Affiliation(s)
- E Fiore
- Department of Animal Medicine, Production and Health, University of Padua, Viale dell'Università 16, Legnaro 35020, Padua, Italy
| | - A Lisuzzo
- Department of Animal Medicine, Production and Health, University of Padua, Viale dell'Università 16, Legnaro 35020, Padua, Italy
| | - L Laghi
- Department of Agro-Food Science and Technology, University of Bologna, Piazza Goidanich 60, 47521, Cesena, Italy
| | - K J Harvatine
- Department of Animal Science, Pennsylvania State University, State College 16801
| | - E Mazzotta
- Istituto Zooprofilattico delle Venezie, Viale dell'Università 10, Legnaro 35020, Italy
| | - M C Alterisio
- Department of Veterinary Medicine and Animal Productions, University of Napoli "Federico II," Via Delpino 1, 80137 Napoli, Italy.
| | - P Ciaramella
- Department of Veterinary Medicine and Animal Productions, University of Napoli "Federico II," Via Delpino 1, 80137 Napoli, Italy
| | - C Zhu
- College of Food Science and Technology, Southwest Minzu University, Chengdu, 610041 Sichuan, China
| | - B Contiero
- Department of Animal Medicine, Production and Health, University of Padua, Viale dell'Università 16, Legnaro 35020, Padua, Italy
| | - V Faillace
- Department of Animal Medicine, Production and Health, University of Padua, Viale dell'Università 16, Legnaro 35020, Padua, Italy
| | - J Guccione
- Department of Veterinary Medicine and Animal Productions, University of Napoli "Federico II," Via Delpino 1, 80137 Napoli, Italy
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Fabrile MP, Ghidini S, Conter M, Varrà MO, Ianieri A, Zanardi E. Filling gaps in animal welfare assessment through metabolomics. Front Vet Sci 2023; 10:1129741. [PMID: 36925610 PMCID: PMC10011658 DOI: 10.3389/fvets.2023.1129741] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Accepted: 02/09/2023] [Indexed: 03/08/2023] Open
Abstract
Sustainability has become a central issue in Italian livestock systems driving food business operators to adopt high standards of production concerning animal husbandry conditions. Meat sector is largely involved in this ecological transition with the introduction of new label claims concerning the defense of animal welfare (AW). These new guarantees referred to AW provision require new tools for the purpose of authenticity and traceability to assure meat supply chain integrity. Over the years, European Union (EU) Regulations, national, and international initiatives proposed provisions and guidelines for assuring AW introducing requirements to be complied with and providing tools based on scoring systems for a proper animal status assessment. However, the comprehensive and objective assessment of the AW status remains challenging. In this regard, phenotypic insights at molecular level may be investigated by metabolomics, one of the most recent high-throughput omics techniques. Recent advances in analytical and bioinformatic technologies have led to the identification of relevant biomarkers involved in complex clinical phenotypes of diverse biological systems suggesting that metabolomics is a key tool for biomarker discovery. In the present review, the Five Domains model has been employed as a vademecum describing AW. Starting from the individual Domains-nutrition (I), environment (II), health (III), behavior (IV), and mental state (V)-applications and advances of metabolomics related to AW setting aimed at investigating phenotypic outcomes on molecular scale and elucidating the biological routes most perturbed from external solicitations, are reviewed. Strengths and weaknesses of the current state-of-art are highlighted, and new frontiers to be explored for AW assessment throughout the metabolomics approach are argued. Moreover, a detailed description of metabolomics workflow is provided to understand dos and don'ts at experimental level to pursue effective results. Combining the demand for new assessment tools and meat market trends, a new cross-strategy is proposed as the promising combo for the future of AW assessment.
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Affiliation(s)
| | - Sergio Ghidini
- Department of Food and Drug, University of Parma, Parma, Italy
| | - Mauro Conter
- Department of Veterinary Science, University of Parma, Parma, Italy
| | | | - Adriana Ianieri
- Department of Food and Drug, University of Parma, Parma, Italy
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Changes in plasma fatty acids profile in hyperketonemic ewes during early lactation: a preliminary study. Sci Rep 2022; 12:17017. [PMID: 36220846 PMCID: PMC9553884 DOI: 10.1038/s41598-022-21088-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2022] [Accepted: 09/22/2022] [Indexed: 12/29/2022] Open
Abstract
The transition from late pregnancy to early lactation is characterized by marked changes in energy balance of dairy ruminants. The mobilization of adipose tissue led to an increase in plasma non-esterified fatty acids (NEFA) and β-hydroxybutyrate (BHB). The aim of this study was to analyze the total plasma fatty acids of healthy and hyperketonemic dairy ewes in early lactation through gas chromatography (GC) to evaluate metabolic alterations. An observational study was used with a cross-sectional experimental design. Forty-six Sarda dairy ewes were enrolled in the immediate post-partum (7 ± 3 days in milk) and divided into two groups according to serum BHB concentration: non-hyperketonemic group (n = 28; BHB < 0.86 mmol/L) and hyperketonemic group (n = 18; BHB ≥ 0.86 mmol/L). A two-way ANOVA included the effect of group and parity was used to evaluate differences in fatty acids (FA) concentrations. A total of 34 plasma FA was assessed using GC. 12 out of 34 FA showed a significant different between groups and 3 out of 34 were tended to significance. Only NEFA concentration and stearic acid were influenced by parity. The results may suggest possible links with lipid metabolism, inflammatory and immune responses in hyperketonemic group. In conclusion, GC represents a useful tool in the study of hyperketonemia and primiparous dairy ewes might show a greater risk to develop this condition.
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Evaluation of Ultrasound Measurement of Subcutaneous Fat Thickness in Dairy Jennies during the Periparturient Period. Animals (Basel) 2022; 12:ani12111359. [PMID: 35681823 PMCID: PMC9179614 DOI: 10.3390/ani12111359] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Revised: 05/17/2022] [Accepted: 05/24/2022] [Indexed: 11/16/2022] Open
Abstract
Simple Summary Ultrasonography is an accurate method to objectively measure subcutaneous fat (SF) thickness and to routinely predict body fat reserves in cows, horses, and donkeys. The aim of the present study was to describe ultrasonographic SF thickness in periparturient jennies. The SF was evaluated in 6 different truncal location in 6 dairy jennies prior and post parturition. Measurement values were reported and each site were compared through time. No statistically significant differences were found between sites and time. The mean values of SF measurements were above those reported by others. A good and reliable association was detected between body condition score (BCS) and sites during the whole study period. Our study gives a preliminary description of different body locations fat reserves evaluated by ultrasonography, showing no significative variations, in pregnant and lactating jennies. Abstract The body condition score (BCS) represents a practical but subjective method for assessing body fat reserves. Real time ultrasonography (RTU) has been proposed as an accurate method to objectively measure subcutaneous fat (SF) thickness and predict body fat reserves in cows, horses and donkeys. The aim of the present study was to describe RTU measures of SF thickness during periparturient period in jennies. The present prospective cohort study evaluated six dairy jennies. SF RTU were performed at 15 and 7 days before the presumptive delivery, and 2, 15 and 30 days after delivery. A portable ultrasound machine and multifrequency linear transducer (5–7.5 MHz) was used. RTU images were obtained in six sites (S1–S6). Results at each time point were reported as mean ± standard deviation and compared through time. A total of 180 images were evaluated. RTU technique was easy to perform and well tolerated. No statistically significant differences were found of each site during time, except for S2 and S6a: S2 at T2 and S6a at T1 were significatively different to values obtained at T5. The RTU mean values were above those reported by others, suggesting major physio-logical challenges related to energy balance and fat mobilization in pregnant jennies bred for milking production. BCS and sites through observational time have shown a good and reliable association. Our study could give preliminary indications on fat reserves in different body locations evaluated thanks to RTU and it show no significative variation of SF thickness, in pregnant and lactating jennies.
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Zhu Y, Bu D, Ma L. Integration of Multiplied Omics, a Step Forward in Systematic Dairy Research. Metabolites 2022; 12:metabo12030225. [PMID: 35323668 PMCID: PMC8955540 DOI: 10.3390/metabo12030225] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Revised: 02/22/2022] [Accepted: 02/23/2022] [Indexed: 02/07/2023] Open
Abstract
Due to their unique multi-gastric digestion system highly adapted for rumination, dairy livestock has complicated physiology different from monogastric animals. However, the microbiome-based mechanism of the digestion system is congenial for biology approaches. Different omics and their integration have been widely applied in the dairy sciences since the previous decade for investigating their physiology, pathology, and the development of feed and management protocols. The rumen microbiome can digest dietary components into utilizable sugars, proteins, and volatile fatty acids, contributing to the energy intake and feed efficiency of dairy animals, which has become one target of the basis for omics applications in dairy science. Rumen, liver, and mammary gland are also frequently targeted in omics because of their crucial impact on dairy animals’ energy metabolism, production performance, and health status. The application of omics has made outstanding contributions to a more profound understanding of the physiology, etiology, and optimizing the management strategy of dairy animals, while the multi-omics method could draw information of different levels and organs together, providing an unprecedented broad scope on traits of dairy animals. This article reviewed recent omics and multi-omics researches on physiology, feeding, and pathology on dairy animals and also performed the potential of multi-omics on systematic dairy research.
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Affiliation(s)
- Yingkun Zhu
- State Key Laboratory of Animal Nutrition, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China;
- School of Agriculture & Food Science, University College Dublin, Belfield, D04 V1W8 Dublin, Ireland
| | - Dengpan Bu
- State Key Laboratory of Animal Nutrition, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China;
- Joint Laboratory on Integrated Crop-Tree-Livestock Systems of the Chinese Academy of Agricultural Sciences (CAAS), Ethiopian Institute of Agricultural Research (EIAR), and World Agroforestry Center (ICRAF), Beijing 100193, China
- Correspondence: (D.B.); (L.M.)
| | - Lu Ma
- State Key Laboratory of Animal Nutrition, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China;
- Correspondence: (D.B.); (L.M.)
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