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Timlin M, Fitzpatrick E, McCarthy K, Tobin JT, Murphy EG, Pierce KM, Murphy JP, Hennessy D, O'Donovan M, Harbourne N, Brodkorb A, O'Callaghan TF. Impact of varying levels of pasture allowance on the nutritional quality and functionality of milk throughout lactation. J Dairy Sci 2023; 106:6597-6622. [PMID: 37532625 DOI: 10.3168/jds.2022-22921] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2022] [Accepted: 03/12/2023] [Indexed: 08/04/2023]
Abstract
The objective of this study was to examine the impact of increasing proportions of grazed pasture in the diet on the composition, quality, and functionality of bovine milk across a full lactation. Fifty-four spring-calving cows were randomly assigned to 1 of 3 groups (n = 18), blocked on the basis of mean calving date (February 15, 2020 ± 0.8 d), pre-experimental daily milk yield (24.70 ± 3.70 kg), milk solids yield (2.30 ± 0.27 kg), lactation number (3.10 ± 0.13), and economic breeding index (182 ± 19). Raw milk samples were obtained weekly from each group between March and November 2020. Group 1 (GRS) consumed perennial ryegrass and was supplemented with 5% concentrates (dry matter basis); group 2 was maintained indoors and consumed a total mixed ration (TMR) diet consisting of maize silage, grass silage, and concentrates; and group 3 consumed a partial mixed ration diet (PMR), rotating between perennial ryegrass during the day and indoor TMR feeding at night. Raw milk samples consisted of a pooled morning and evening milking and were analyzed for gross composition, free amino acids, fatty acid composition, heat coagulation time, color, fat globule size, and pH. The TMR milks had a significantly higher total solids, lactose, protein, and whey protein as a proportion of protein content compared with both GRS and PMR milks. The GRS milks demonstrated a significantly lower somatic cell count (SCC), but a significantly higher pH and b*-value than both TMR and PMR milks. The PMR milks exhibited significantly lower total solids and fat content, but also demonstrated significantly higher SCC and total free amino acid content compared with GRS and TMR. Partial least squares discriminant analysis of fatty acid profiles displayed a distinct separation between GRS and TMR samples, while PMR displayed an overlap between both GRS and TMR groupings. Variable importance in projection analysis identified conjugated linoleic acid cis-9,trans-11, C18:2n-6 cis, C18:3n-3, C11:0, and C18:2n-6 trans as the largest contributors to the variation between the diets. Milk fats derived from GRS diets exhibited the highest proportion of unsaturated fats and higher unsaturation, health-promoting, and desaturase indices. The lowest proportions of saturated fats and the lowest atherogenic index were also exhibited by GRS-derived milk fats. This work highlights the positive influence of grass-fed milk for human consumption through its more nutritionally beneficial fatty acid profile, despite the highest milk solid percentages derived from TMR feeding systems. Furthermore, this study demonstrates the proportional response of previously highlighted biomarkers of pasture feeding to the proportion of pasture in the cow's diet.
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Affiliation(s)
- Mark Timlin
- Teagasc Moorepark Food Research Centre, Fermoy, Co. Cork, Ireland P61 C996; School of Agriculture and Food Science, University College Dublin, Belfield, Dublin 4, Ireland D04 V1W8; Food for Health Ireland, University College Dublin, Ireland D04 V1W8
| | - Ellen Fitzpatrick
- Teagasc, Environmental Research Centre, Johnstown Castle, Wexford, Ireland Y35 Y521
| | - Kieran McCarthy
- Teagasc, Animal and Grassland Research and Innovation Centre, Moorepark, Fermoy, Co. Cork, Ireland P61 P302
| | - John T Tobin
- Teagasc Moorepark Food Research Centre, Fermoy, Co. Cork, Ireland P61 C996
| | - Eoin G Murphy
- Teagasc Moorepark Food Research Centre, Fermoy, Co. Cork, Ireland P61 C996; Food for Health Ireland, University College Dublin, Ireland D04 V1W8
| | - Karina M Pierce
- School of Agriculture and Food Science, University College Dublin, Belfield, Dublin 4, Ireland D04 V1W8; Food for Health Ireland, University College Dublin, Ireland D04 V1W8
| | - John P Murphy
- Teagasc, Animal and Grassland Research and Innovation Centre, Moorepark, Fermoy, Co. Cork, Ireland P61 P302
| | - Deirdre Hennessy
- Teagasc, Animal and Grassland Research and Innovation Centre, Moorepark, Fermoy, Co. Cork, Ireland P61 P302; School of Biological, Earth and Environmental Sciences, University College Cork, Cork, Ireland T23 N73K
| | - Michael O'Donovan
- Teagasc, Animal and Grassland Research and Innovation Centre, Moorepark, Fermoy, Co. Cork, Ireland P61 P302
| | - Niamh Harbourne
- School of Agriculture and Food Science, University College Dublin, Belfield, Dublin 4, Ireland D04 V1W8
| | - André Brodkorb
- Teagasc Moorepark Food Research Centre, Fermoy, Co. Cork, Ireland P61 C996; Food for Health Ireland, University College Dublin, Ireland D04 V1W8.
| | - Tom F O'Callaghan
- Food for Health Ireland, University College Dublin, Ireland D04 V1W8; School of Food and Nutritional Sciences, University College Cork, Cork, Ireland T12 K8AF
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Ding H, Han Z, Wang B, Wang Y, Ran Y, Zhang L, Li Y, Lu C, Lu X, Ma L. Effect of Direct Steam Injection and Instantaneous Ultra-High-Temperature (DSI-IUHT) Sterilization on the Physicochemical Quality and Volatile Flavor Components of Milk. Molecules 2023; 28:molecules28083543. [PMID: 37110776 PMCID: PMC10143338 DOI: 10.3390/molecules28083543] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Revised: 03/31/2023] [Accepted: 04/13/2023] [Indexed: 04/29/2023] Open
Abstract
The effects of variations in the heat treatment process of milk on its quality and flavor are inevitable. This study investigated the effect of direct steam injection and instantaneous ultra-high-temperature (DSI-IUHT, 143 °C, 1-2 s) sterilization on the physicochemical properties, whey protein denaturation (WPD) rate, and volatile compounds (VCs) of milk. The experiment compared raw milk as a control with high-temperature short-time (HTST, 75 °C 15 s and 85 °C 15 s) pasteurization and indirect ultra-high-temperature (IND-UHT, 143 °C, 3-4 s) sterilization. The results showed no significant differences (p > 0.05) in physical stability between milk samples with different heat treatments. The DSI-IUHT and IND-UHT milks presented smaller particle sizes (p < 0.05) and more concentrated distributions than the HTST milk. The apparent viscosity of the DSI-IUHT milk was significantly higher than the other samples (p < 0.05) and is consistent with the microrheological results. The WPD of DSI-IUHT milk was 27.52% lower than that of IND-UHT milk. Solid-phase microextraction (SPME) and solvent-assisted flavor evaporation (SAFE) were combined with the WPD rates to analyze the VCs, which were positively correlated with ketones, acids, and esters and negatively associated with alcohols, heterocycles, sulfur, and aldehydes. The DSI-IUHT samples exhibited a higher similarity to raw and HTST milk than the IND-UHT samples. In summary, DSI-IUHT was more successful in preserving the milk's quality due to its milder sterilization conditions compared to IND-UHT. This study provides excellent reference data for the application of DSI-IUHT treatment in milk processing.
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Affiliation(s)
- Hao Ding
- School of Food and Health, Beijing Technology and Business University, Beijing 100048, China
| | - Zhaosheng Han
- School of Food and Health, Beijing Technology and Business University, Beijing 100048, China
| | - Bei Wang
- School of Food and Health, Beijing Technology and Business University, Beijing 100048, China
| | - Yadong Wang
- School of Food and Health, Beijing Technology and Business University, Beijing 100048, China
| | - Yawen Ran
- School of Food and Health, Beijing Technology and Business University, Beijing 100048, China
| | - Liebing Zhang
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China
| | - Yan Li
- School of Food and Health, Beijing Technology and Business University, Beijing 100048, China
| | - Chun Lu
- Junlebao Dairy Group Co., Ltd., Shijiazhuang 050221, China
| | - Xiaoli Lu
- Junlebao Dairy Group Co., Ltd., Shijiazhuang 050221, China
| | - Ligang Ma
- Junlebao Dairy Group Co., Ltd., Shijiazhuang 050221, China
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3
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Chudy S, Teichert J. Oxysterols in stored powders as potential health hazards. Sci Rep 2021; 11:21192. [PMID: 34707144 PMCID: PMC8551233 DOI: 10.1038/s41598-021-00636-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2021] [Accepted: 10/07/2021] [Indexed: 11/09/2022] Open
Abstract
Cholesterol oxidation products (COPs) have greater biological activity than cholesterol itself. Oxysterols reduce the nutritional value of foods and exhibit a wide range of biological activity, including pro-oxidant, carcinogenic, and cytotoxic properties. The most commonly detected oxysterols in foods are 7α-HC, 7β-HC, a product of their dehydrogenation 7-KC and α-CE, β-CE. The main dietary sources of oxysterols are eggs and egg-derived products, thermally processed milk and milk-based products, fried meat. This study aimed to measure the amount of cholesterol oxidation products in milk powder, egg powder and milk-egg powder during 24 months of storage. The changes in the selected oxysterols (determined by gas chromatography) were recorded. In milk powder, after the production process, the amount of cholesterol was 0.2 g 100 g-1 fat and in egg powder it was 3.4 g 100 g-1. After 6 months of storage, the dominant oxysterol in milk and egg powder was 7α-HC and in milk-egg powder it was 7-KC. After the storage period, oxysterols in powdered milk reached 1.81% of total cholesterol. The most stable cholesterol was in the milk-egg mixture and its oxidation was the slowest. This study showed the presence of COPs in milk powder, egg powder and milk-egg powder and the effect of storage on cholesterol oxidation.
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Affiliation(s)
- Sylwia Chudy
- Department of Dairy and Process Engineering, Faculty of Food Science and Nutrition, Poznań University of Life Sciences, ul. Wojska Polskiego 31, 60-624, Poznan, Poland.
| | - Joanna Teichert
- Department of Dairy and Process Engineering, Faculty of Food Science and Nutrition, Poznań University of Life Sciences, ul. Wojska Polskiego 31, 60-624, Poznan, Poland
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Clarke HJ, Griffin C, Hennessy D, O'Callaghan TF, O'Sullivan MG, Kerry JP, Kilcawley KN. Effect of bovine feeding system (pasture or concentrate) on the oxidative and sensory shelf life of whole milk powder. J Dairy Sci 2021; 104:10654-10668. [PMID: 34275630 DOI: 10.3168/jds.2021-20299] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2021] [Accepted: 05/25/2021] [Indexed: 11/19/2022]
Abstract
Correlating volatile compounds with the sensory attributes of whole milk powder (WMP) is fundamental for appreciating the effect of lipid oxidation (LO) on sensory perception. LO compounds can adversely affect the sensory perception of WMP by imparting rancid, metallic, and painty notes. Whole milk powders derived from milk produced by cows maintained on a pasture diet (grass and grass-clover mix) versus a nonpasture diet [total mixed ration (TMR); concentrates and silage] were stored at room temperature 21°C (ambient storage) and 37°C (accelerated storage) and analyzed for volatile compounds and sensory attributes every 2 mo for a total of 6 mo. Thirteen volatile compounds originating from LO were chosen to track the volatile profile of the WMP during storage. Color, composition, total fatty acid, and free fatty acid profiling were also carried out. Significant variations in the concentrations of 14 fatty acids were observed in WMP based on diet. Concentrations of free fatty acids increased in all sample types during storage. Similar trends in sensory attributes were observed with an increase in painty attributes, corresponding to an increase in hexanal. Buttery/toffee attributes were found to be more closely correlated with TMR WMP. Those WMP derived from pasture diets were found to be more susceptible to LO from a volatile perspective, particularly in relation to aldehyde development, which is likely due to increased concentrations of conjugated linoleic acid and α-linolenic acid found in these samples.
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Affiliation(s)
- H J Clarke
- Food Quality and Sensory Science, Teagasc Food Research Centre, Moorepark, Fermoy, P61 C996, Ireland; Sensory Group, School of Food and Nutritional Sciences, University College Cork, T12 R229, Ireland
| | - C Griffin
- Food Industry Development, Teagasc Food Research Centre, Ashtown, Dublin 15, D15 DY05, Ireland
| | - D Hennessy
- Teagasc Animal and Grassland Research and Innovation Centre, Moorepark, Fermoy, P61 C996 Cork, Ireland
| | - T F O'Callaghan
- School of Food and Nutritional Sciences, University College Cork, T12 R229, Ireland
| | - M G O'Sullivan
- Sensory Group, School of Food and Nutritional Sciences, University College Cork, T12 R229, Ireland
| | - J P Kerry
- Food Packaging Group, School of Food and Nutritional Sciences, University College Cork, T12 R229, Ireland
| | - K N Kilcawley
- Food Quality and Sensory Science, Teagasc Food Research Centre, Moorepark, Fermoy, P61 C996, Ireland.
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5
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Tzima K, Brunton NP, McCarthy NA, Kilcawley KN, Mannion DT, Rai DK. The Effect of Carnosol, Carnosic Acid and Rosmarinic Acid on the Oxidative Stability of Fat-Filled Milk Powders throughout Accelerated Oxidation Storage. Antioxidants (Basel) 2021; 10:762. [PMID: 34064839 PMCID: PMC8151479 DOI: 10.3390/antiox10050762] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2021] [Revised: 04/22/2021] [Accepted: 05/05/2021] [Indexed: 12/03/2022] Open
Abstract
The in vitro antioxidant effects of the most potent antioxidants of rosemary, namely carnosol, carnosic acid and rosmarinic acid (c: ca: ra) were assessed in fat-filled milk powders (FFMPs) under accelerated conditions (40 °C and relative humidity (RH) 23%) over 90 days. Lipid oxidation was assessed in FFMPs by measuring peroxide values (PVs), thiobarbituric acid reactive substances (TBARS) and aroma volatiles using headspace (HS) solid-phase microextraction (SPME) coupled to gas-chromatography-mass spectrometry (GC-MS). The antioxidant potency of c: ca: ra exhibited a concentration-related effect (308 ppm > 200 ppm > 77 ppm), with the highest concentration being the most effective at controlling the formation of TBARS and PVs. At a concentration of 308 ppm c: ca: ra were particularly effective (p < 0.05) in inhibiting all the evaluated oxidation indices (primary and secondary) compared to the control samples, but in some cases less effectively (p < 0.05) than butylated hydroxyanisole: butylated hydroxytoluene (BHA: BHT) (200 ppm).
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Affiliation(s)
- Katerina Tzima
- Department of Food BioSciences, Teagasc Food Research Centre, Ashtown, D15 KN3K Dublin, Ireland; (K.T.); (D.K.R.)
- UCD Institute of Food and Health, University College Dublin, Belfield, D04 V1W8 Dublin, Ireland
| | - Nigel P. Brunton
- UCD Institute of Food and Health, University College Dublin, Belfield, D04 V1W8 Dublin, Ireland
| | - Noel A. McCarthy
- Department of Food Chemistry and Technology, Teagasc Food Research Centre, Moorepark, Fermoy, P61 C996 Cork, Ireland;
| | - Kieran N. Kilcawley
- Department of Food Quality and Sensory Science, Teagasc Food Research Centre, Moorepark, Fermoy, P61 C996 Cork, Ireland; (K.N.K.); (D.T.M.)
| | - David T. Mannion
- Department of Food Quality and Sensory Science, Teagasc Food Research Centre, Moorepark, Fermoy, P61 C996 Cork, Ireland; (K.N.K.); (D.T.M.)
| | - Dilip K. Rai
- Department of Food BioSciences, Teagasc Food Research Centre, Ashtown, D15 KN3K Dublin, Ireland; (K.T.); (D.K.R.)
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6
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Magan JB, O Callaghan TF, Kelly AL, McCarthy NA. Compositional and functional properties of milk and dairy products derived from cows fed pasture or concentrate-based diets. Compr Rev Food Sci Food Saf 2021; 20:2769-2800. [PMID: 33949109 DOI: 10.1111/1541-4337.12751] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2020] [Revised: 02/24/2021] [Accepted: 03/12/2021] [Indexed: 12/11/2022]
Abstract
Worldwide milk production is predominantly founded on indoor, high-concentrate feeding systems, whereas pasture-based feeding systems are most common in New Zealand and Ireland but have received greater attention recently in countries utilizing conventional systems. Consumer interest in 'pasture-fed' dairy products has also increased, arising from environmental, ethical, and nutritional concerns. A substantial body of research exists describing the effect of different feeding strategies on the composition of milk, with several recent studies focusing on the comparison of pasture- and concentrate-based feeding regimes. Significant variation is typically observed in the gross composition of milk produced from different supplemental feeds, but various changes in the discrete composition of macromolecular components in milk have also been associated with dietary influence, particularly in relation to the fatty acid profile. Changes in milk composition have also been shown to have implications for milk and dairy product processability, functionality and sensory properties. Methods to determine the traceability of dairy products or verify marketing claims such as 'pasture-fed' have also been established, based on compositional variation due to diet. This review explores the effects of feed types on milk composition and quality, along with the ultimate effect of diet-induced changes on milk and dairy product functionality, with particular emphasis placed on pasture- and concentrate-based feeding systems.
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Affiliation(s)
- Jonathan B Magan
- Food Chemistry and Technology, Teagasc Food Research Centre, Cork, Ireland.,School of Food and Nutritional Sciences, University College Cork, Cork, Ireland
| | - Tom F O Callaghan
- School of Food and Nutritional Sciences, University College Cork, Cork, Ireland
| | - Alan L Kelly
- School of Food and Nutritional Sciences, University College Cork, Cork, Ireland
| | - Noel A McCarthy
- Food Chemistry and Technology, Teagasc Food Research Centre, Cork, Ireland
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7
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Moscovici Joubran A, Pierce KM, Garvey N, Shalloo L, O'Callaghan TF. Invited review: A 2020 perspective on pasture-based dairy systems and products. J Dairy Sci 2021; 104:7364-7382. [PMID: 33865573 DOI: 10.3168/jds.2020-19776] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Accepted: 03/02/2021] [Indexed: 11/19/2022]
Abstract
Grazing pasture is the basis for dairy production systems in regions with temperate climates, such as in Ireland, New Zealand, parts of Australia, the United States, and Europe. Milk and dairy products from cows on pasture-based farms predominantly consuming fresh grazed grass (typically classified as "grass-fed" milk) have been previously shown to possess a different nutrient profile, with potential nutritional benefits, compared with conventional milk derived from total mixed ration. Moreover, pasture-based production systems are considered more environmentally and animal welfare friendly by consumers. As such, there is significant potential for market capitalization on grass-fed dairy products. As competition in this space increases, the regulations of what constitutes as grass-fed vary between different regions of the world. With this in mind, there is a need for clear and independently accredited grass-fed standards, defining the grass-fed criteria for labeling of products as such, subsequently increasing the clarity and confidence for the consumer. This review outlines the numerous effects of pasture production systems on dairy product composition, nutritional profile, and sustainability, and highlights potential future methods for authentication.
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Affiliation(s)
- Alice Moscovici Joubran
- Food For Health Ireland, University College Dublin, Dublin D04 V1W8, Ireland; School of Agriculture and Food Science, University College Dublin, Dublin D04 V1W8, Ireland
| | - Karina M Pierce
- Food For Health Ireland, University College Dublin, Dublin D04 V1W8, Ireland; School of Agriculture and Food Science, University College Dublin, Dublin D04 V1W8, Ireland
| | - Niamh Garvey
- Food For Health Ireland, University College Dublin, Dublin D04 V1W8, Ireland
| | - Laurence Shalloo
- Teagasc Animal and Grassland Research and Innovation Centre, Moorepark, Fermoy, Co. Cork P61 C996, Ireland
| | - Tom F O'Callaghan
- Food For Health Ireland, University College Dublin, Dublin D04 V1W8, Ireland; Teagasc Food Research, Moorepark, Fermoy, Co. Cork P61 C996, Ireland; School of Food and Nutritional Sciences, University College Cork, Cork T12 K8AF, Ireland.
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8
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Gómez-Mascaraque LG, Kilcawley K, Hennessy D, Tobin JT, O'Callaghan TF. Raman spectroscopy: A rapid method to assess the effects of pasture feeding on the nutritional quality of butter. J Dairy Sci 2020; 103:8721-8731. [PMID: 32773315 DOI: 10.3168/jds.2020-18716] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Accepted: 05/30/2020] [Indexed: 01/12/2023]
Abstract
The animal diet is a critical variable affecting the composition and functionality of dairy products. As "Grass-Fed" labeling becomes more prominent on the market, rapid and label-free methods for verification of feeding systems are required. This work proposes the use of Raman spectroscopy to study the effects of 3 different experimental cow feeding systems-perennial ryegrass pasture, perennial ryegrass with white clover pasture, and an indoor total mixed ration diet (TMR)-on the nutritional quality of sweet cream butter. The results demonstrate that Raman spectroscopy coupled with multivariate analysis is a promising approach to distinguish butter derived from pasture or conventional TMR feeding systems. A Pearson correlation analysis confirmed high positive correlations between the spectral bin at 1,657 cm-1, ascribed to the stretching vibrations of C=C bonds, and concentrations of α-linolenic acid and conjugated linolenic acid (CLA) in butter, and in general with the concentration of n-3 and n-3+CLA fatty acids and polyunsaturated fatty acids in the samples. The yellow color indicative of the presence of carotenoids in butter, which has previously been suggested as a biomarker of pasture or "Grass-Fed" feeding, was also positively correlated with the data obtained from the Raman spectra. Raman spectroscopy could also be used to accurately predict indicators of the nutritional quality of butter, such as the thrombogenic index, which showed a strong negative correlation with the spectral bin at 3,023 cm-1.
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Affiliation(s)
- L G Gómez-Mascaraque
- Food Chemistry and Technology Department, Teagasc Moorepark Food Research Centre, Fermoy, Co. Cork, P61 C996, Ireland; VistaMilk SFI Research Centre, Teagasc, Moorepark, Fermoy, Co. Cork, P61 P302, Ireland.
| | - K Kilcawley
- Food Quality and Sensory Science Department, Teagasc Moorepark Food Research Centre, Fermoy, Co. Cork, P61 C996, Ireland
| | - D Hennessy
- VistaMilk SFI Research Centre, Teagasc, Moorepark, Fermoy, Co. Cork, P61 P302, Ireland; Teagasc, Animal and Grassland Research and Innovation Centre, Moorepark, Fermoy, Co. Cork, P61 P302, Ireland
| | - J T Tobin
- Food Chemistry and Technology Department, Teagasc Moorepark Food Research Centre, Fermoy, Co. Cork, P61 C996, Ireland; VistaMilk SFI Research Centre, Teagasc, Moorepark, Fermoy, Co. Cork, P61 P302, Ireland
| | - T F O'Callaghan
- Food Chemistry and Technology Department, Teagasc Moorepark Food Research Centre, Fermoy, Co. Cork, P61 C996, Ireland; VistaMilk SFI Research Centre, Teagasc, Moorepark, Fermoy, Co. Cork, P61 P302, Ireland
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9
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Grazing of Dairy Cows in Europe—An In-Depth Analysis Based on the Perception of Grassland Experts. SUSTAINABILITY 2020. [DOI: 10.3390/su12031098] [Citation(s) in RCA: 41] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Grazing is inherently close to the nature of herbivores, but no longer applied everywhere in Europe. Therefore, the perception of grassland experts on the occurrence, importance, constraints, solutions and future of grazing of dairy cows was studied. The study builds on results from the European Grassland Federation Working Group Grazing in the period 2010–2019. Both surveys and focus group meetings were used. There is a clear trend of reduced grazing in Europe. Since grazing is valued by different stakeholders and provides many ecosystem services, solutions to the constraints to grazing must be found. Constraints can be divided into region specific constraints, farm specific constraints and farmer specific constraints. The solutions include developing new knowledge, bringing the knowledge already available to practice and rewarding farmers for grazing as a service to society. If grazing is not supported, it will further decline. However, a joined endeavour has the potential to make a significant difference in transforming grass-based production systems and stimulating grazing.
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10
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Magan JB, O’Callaghan TF, Zheng J, Zhang L, Mandal R, Hennessy D, Fenelon MA, Wishart DS, Kelly AL, McCarthy NA. Impact of Bovine Diet on Metabolomic Profile of Skim Milk and Whey Protein Ingredients. Metabolites 2019; 9:metabo9120305. [PMID: 31861081 PMCID: PMC6950411 DOI: 10.3390/metabo9120305] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2019] [Revised: 12/13/2019] [Accepted: 12/14/2019] [Indexed: 02/07/2023] Open
Abstract
The influence of bovine diet on the metabolome of reconstituted skim milk powder (SMP) and protein ingredients produced from the milk of cows fed on pasture or concentrate-based diets was investigated. Cows were randomly assigned to diets consisting of perennial ryegrass only (GRS), perennial ryegrass/white clover sward (CLV), or indoor total mixed ration (TMR) for an entire lactation. Raw milk obtained from each group was processed at pilot scale, to produce SMP and sweet whey, and SMP was further processed at laboratory scale, to yield ideal whey and acid whey. The total amino acid composition and metabolome of each sample were analyzed, using high-performance cation exchange and a targeted combination of direct-injection mass spectrometry and reverse-phase liquid chromatography–tandem mass spectrometry (LC–MS/MS), respectively. The nitrogen composition of the products from each of the diets was similar, with one exception being the significantly higher nonprotein nitrogen content in TMR-derived skim milk powder than that from the GRS system. Total amino acid analysis showed significantly higher concentrations of glycine in GRS- and CLV-derived sweet whey and acid whey than in those from TMR. The cysteine contents of CLV-derived ideal whey and acid whey were significantly higher than for TMR, while the valine content of GRS-derived acid whey was significantly higher than TMR. The phenylalanine content of GRS-derived ideal whey was significantly higher than that from CLV. Metabolomic analysis showed significantly higher concentrations of the metabolites glutamine, valine, and phosphocreatine in each ingredient type derived from TMR than those from GRS or CLV, while the serine content of each GRS-derived ingredient type was significantly higher than that in TMR-derived ingredients. These results demonstrate that the type of bovine feeding system used can have a significant effect on the amino acid composition and metabolome of skim milk and whey powders and may aid in the selection of raw materials for product manufacture, while the clear separation between the samples gives further evidence for distinguishing milk products produced from different feeding systems based on LC–MS/MS.
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Affiliation(s)
- Jonathan B. Magan
- Food Chemistry & Technology Department, Teagasc Food Research Centre, Moorepark, Fermoy, P61 C996 Cork, Ireland; (J.B.M.); (T.F.O.); (M.A.F.)
- School of Food and Nutritional Sciences, University College Cork, T12 YT20 Cork, Ireland;
| | - Tom F. O’Callaghan
- Food Chemistry & Technology Department, Teagasc Food Research Centre, Moorepark, Fermoy, P61 C996 Cork, Ireland; (J.B.M.); (T.F.O.); (M.A.F.)
| | - Jiamin Zheng
- The Metabolomics Innovation Centre, School of Biological Sciences, University of Alberta, Edmonton, AB T6G1C9, Canada; (J.Z.); (L.Z.); (R.M.); (D.S.W.)
| | - Lun Zhang
- The Metabolomics Innovation Centre, School of Biological Sciences, University of Alberta, Edmonton, AB T6G1C9, Canada; (J.Z.); (L.Z.); (R.M.); (D.S.W.)
| | - Rupasri Mandal
- The Metabolomics Innovation Centre, School of Biological Sciences, University of Alberta, Edmonton, AB T6G1C9, Canada; (J.Z.); (L.Z.); (R.M.); (D.S.W.)
| | - Deirdre Hennessy
- Teagasc Animal and Grassland Research & Innovation Centre, Moorepark, Fermoy, P61 C996 Cork, Ireland;
| | - Mark A. Fenelon
- Food Chemistry & Technology Department, Teagasc Food Research Centre, Moorepark, Fermoy, P61 C996 Cork, Ireland; (J.B.M.); (T.F.O.); (M.A.F.)
| | - David S. Wishart
- The Metabolomics Innovation Centre, School of Biological Sciences, University of Alberta, Edmonton, AB T6G1C9, Canada; (J.Z.); (L.Z.); (R.M.); (D.S.W.)
| | - Alan L. Kelly
- School of Food and Nutritional Sciences, University College Cork, T12 YT20 Cork, Ireland;
| | - Noel A. McCarthy
- Food Chemistry & Technology Department, Teagasc Food Research Centre, Moorepark, Fermoy, P61 C996 Cork, Ireland; (J.B.M.); (T.F.O.); (M.A.F.)
- Correspondence: ; Tel.: +353-(0)25-42202
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