Composition and properties of bovine milk: A study from dairy farms in northern Sweden; Part II. Effect of monthly variation
This study investigated the influence of monthly variation on the composition and properties of raw farm milk collected as part of a full-scale cheese-making trial in a region in northern Sweden. In our companion paper, the contribution of on-farm factors to the variation in milk quality attributes...
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ftslunivuppsala:oai:pub.epsilon.slu.se:25082 2023-05-15T17:44:40+02:00 Composition and properties of bovine milk: A study from dairy farms in northern Sweden; Part II. Effect of monthly variation Priyashantha, Hasitha Lundh, Åse Höjer, Annika Bernes, Gun Nilsson, David Hetta, Mårten Hallin Saedén, Karin Gustafsson, Anders H. Johansson, Monika 2021 application/pdf https://pub.epsilon.slu.se/25082/ https://pub.epsilon.slu.se/25082/1/priyashantha_h_et_al_210830.pdf en eng eng https://pub.epsilon.slu.se/25082/1/priyashantha_h_et_al_210830.pdf Priyashantha, Hasitha and Lundh, Åse and Höjer, Annika and Bernes, Gun and Nilsson, David and Hetta, Mårten and Hallin Saedén, Karin and Gustafsson, Anders H. and Johansson, Monika (2021). Composition and properties of bovine milk: A study from dairy farms in northern Sweden; Part II. Effect of monthly variation. Journal of Dairy Science. 104 , 8595-8609 [Research article] Animal and Dairy Science Research article NonPeerReviewed 2021 ftslunivuppsala 2022-01-09T19:16:34Z This study investigated the influence of monthly variation on the composition and properties of raw farm milk collected as part of a full-scale cheese-making trial in a region in northern Sweden. In our companion paper, the contribution of on-farm factors to the variation in milk quality attributes is described. In total, 42 dairy farms were recruited for the study, and farm milk samples were collected monthly over 1 yr and characterized for quality attributes of importance for cheese making. Principal component analysis suggested that milk samples collected during the outdoor period (June-September) were different from milk samples collected during the indoor period. Despite the interaction with the milking system, the results showed that fat and protein concentrations were lower in milk collected during May through August, and lactose concentration was higher in milk collected during April through July than for the other months. Concentrations of free fatty acids were generally low, with the highest value (0.86 mmol/100 g of fat) observed in February and the lowest (0.70 mmol/100 g of fat) observed in June. Plasmin and plasminogen-derived activities varied with sampling month without a clear seasonal pattern. The pH of farm tank milk ranged from 6.60 to 6.82, with the lowest and highest values in September and February, respectively. The highest somatic cell count was observed in August (201 x 10(3) cells/mL) and the lowest in April (143 x 10(3) cells/mL). The highest value of gel strength, was recorded in December (88 Pa) and the lowest in July (64 Pa). Rennet coagulation time and gel strength were inversely correlated, with the lowest rennet coagulation time value observed in December. Orthogonal projections to latent structures (OPLS) and discriminant analysis adaptation of OPLS identified casein micelle size and total proteolysis as the milk quality attributes with major responses to sampling month, with smaller casein micelle size and higher total proteolysis associated with the outdoor months. Using discriminant analysis adaptation of OPLS to further investigate causes behind the variation in milk traits revealed that there were factors in addition to feeding on pasture that differed between outdoor and indoor months. Because fresh grass was seldom the primary feed in the region during the outdoor period, grazing was not considered the sole reason for the observed difference between outdoor and indoor periods in raw milk quality attributes. Article in Journal/Newspaper Northern Sweden Swedish University of Agricultural Sciences (SLU): Epsilon Open Archive |
institution |
Open Polar |
collection |
Swedish University of Agricultural Sciences (SLU): Epsilon Open Archive |
op_collection_id |
ftslunivuppsala |
language |
English |
topic |
Animal and Dairy Science |
spellingShingle |
Animal and Dairy Science Priyashantha, Hasitha Lundh, Åse Höjer, Annika Bernes, Gun Nilsson, David Hetta, Mårten Hallin Saedén, Karin Gustafsson, Anders H. Johansson, Monika Composition and properties of bovine milk: A study from dairy farms in northern Sweden; Part II. Effect of monthly variation |
topic_facet |
Animal and Dairy Science |
description |
This study investigated the influence of monthly variation on the composition and properties of raw farm milk collected as part of a full-scale cheese-making trial in a region in northern Sweden. In our companion paper, the contribution of on-farm factors to the variation in milk quality attributes is described. In total, 42 dairy farms were recruited for the study, and farm milk samples were collected monthly over 1 yr and characterized for quality attributes of importance for cheese making. Principal component analysis suggested that milk samples collected during the outdoor period (June-September) were different from milk samples collected during the indoor period. Despite the interaction with the milking system, the results showed that fat and protein concentrations were lower in milk collected during May through August, and lactose concentration was higher in milk collected during April through July than for the other months. Concentrations of free fatty acids were generally low, with the highest value (0.86 mmol/100 g of fat) observed in February and the lowest (0.70 mmol/100 g of fat) observed in June. Plasmin and plasminogen-derived activities varied with sampling month without a clear seasonal pattern. The pH of farm tank milk ranged from 6.60 to 6.82, with the lowest and highest values in September and February, respectively. The highest somatic cell count was observed in August (201 x 10(3) cells/mL) and the lowest in April (143 x 10(3) cells/mL). The highest value of gel strength, was recorded in December (88 Pa) and the lowest in July (64 Pa). Rennet coagulation time and gel strength were inversely correlated, with the lowest rennet coagulation time value observed in December. Orthogonal projections to latent structures (OPLS) and discriminant analysis adaptation of OPLS identified casein micelle size and total proteolysis as the milk quality attributes with major responses to sampling month, with smaller casein micelle size and higher total proteolysis associated with the outdoor months. Using discriminant analysis adaptation of OPLS to further investigate causes behind the variation in milk traits revealed that there were factors in addition to feeding on pasture that differed between outdoor and indoor months. Because fresh grass was seldom the primary feed in the region during the outdoor period, grazing was not considered the sole reason for the observed difference between outdoor and indoor periods in raw milk quality attributes. |
format |
Article in Journal/Newspaper |
author |
Priyashantha, Hasitha Lundh, Åse Höjer, Annika Bernes, Gun Nilsson, David Hetta, Mårten Hallin Saedén, Karin Gustafsson, Anders H. Johansson, Monika |
author_facet |
Priyashantha, Hasitha Lundh, Åse Höjer, Annika Bernes, Gun Nilsson, David Hetta, Mårten Hallin Saedén, Karin Gustafsson, Anders H. Johansson, Monika |
author_sort |
Priyashantha, Hasitha |
title |
Composition and properties of bovine milk: A study from dairy farms in northern Sweden; Part II. Effect of monthly variation |
title_short |
Composition and properties of bovine milk: A study from dairy farms in northern Sweden; Part II. Effect of monthly variation |
title_full |
Composition and properties of bovine milk: A study from dairy farms in northern Sweden; Part II. Effect of monthly variation |
title_fullStr |
Composition and properties of bovine milk: A study from dairy farms in northern Sweden; Part II. Effect of monthly variation |
title_full_unstemmed |
Composition and properties of bovine milk: A study from dairy farms in northern Sweden; Part II. Effect of monthly variation |
title_sort |
composition and properties of bovine milk: a study from dairy farms in northern sweden; part ii. effect of monthly variation |
publishDate |
2021 |
url |
https://pub.epsilon.slu.se/25082/ https://pub.epsilon.slu.se/25082/1/priyashantha_h_et_al_210830.pdf |
genre |
Northern Sweden |
genre_facet |
Northern Sweden |
op_relation |
https://pub.epsilon.slu.se/25082/1/priyashantha_h_et_al_210830.pdf Priyashantha, Hasitha and Lundh, Åse and Höjer, Annika and Bernes, Gun and Nilsson, David and Hetta, Mårten and Hallin Saedén, Karin and Gustafsson, Anders H. and Johansson, Monika (2021). Composition and properties of bovine milk: A study from dairy farms in northern Sweden; Part II. Effect of monthly variation. Journal of Dairy Science. 104 , 8595-8609 [Research article] |
_version_ |
1766146931377045504 |