Impact of herbage proportion, animal breed, lactation stage and season on the fatty acid and protein composition of milk

Bär, Cornelia; Sutter, Michael; Kopp, Christoph; Neuhaus, Patrick; Portmann, Reto; Egger, Lotti; Reidy, Beat; Bisig, Walter

doi:10.1016/j.idairyj.2020.104785

Cited by 28 publications

(27 citation statements)

References 47 publications

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“…A study conducted in Switzerland identified higher concentrations of milk CLA, branched chain FA and n -3 FA as the proportion of herbage consumed increased [ 87 ]. Studies from both Ireland [ 5 ] and Portugal have demonstrated pasture-based diets positive influence on reducing milks n -6/ n -3 ratio, producing milk with a higher n-3 content and lower n -6 content than cows fed a TMR diet.…”

Section: Milk Compositionmentioning

confidence: 99%

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The Impact of Seasonality in Pasture-Based Production Systems on Milk Composition and Functionality

Timlin

Tobin

Brodkorb

et al. 2021

Foods

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Seasonal calving, pasture-based dairy systems are widely practiced in countries with a temperate climate and plentiful rainfall such as Ireland and New Zealand. This approach maximizes milk production from pasture and, consequently, is a low-cost, low-input dairy production system. On the other hand, the majority of global milk supply is derived from high input indoor total mixed ration systems where seasonal calving is not practiced due to the dependence on ensiled silages, grains and concentrated feeds, which are available year-round. Synchronous changes in the macro and micronutrients in milk are much more noticeable as lactation progresses through early, mid and late stages in seasonal systems compared to non-seasonal systems—which can have implications on the processability and functionality of milk.

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Section: Milk Compositionmentioning

confidence: 99%

“…Pasture derived milk has demonstrated lower lactose contents than milks from non-pasture diets in both Switzerland [ 87 ] and Ireland [ 19 ]. The increase in lactose produced from TMR diets is associated with the higher energy supplied from starch [ 171 , 172 ].…”

Section: Milk Compositionmentioning

confidence: 99%

The Impact of Seasonality in Pasture-Based Production Systems on Milk Composition and Functionality

Timlin

Tobin

Brodkorb

et al. 2021

Foods

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“…The seasonal decrease in milk yield is inevitably linked with the progressing stage of lactation of the dairy cows which were all seasonally calving in spring. The lower protein and casein content found in summer in all grazing systems is in accordance with seasonal patterns found in other studies (Bernabucci et al ., 2015; Bär et al ., 2020). This phenomenon was attributed to heat stress during the summer months (Bernabucci et al ., 2015).…”

Section: Resultsmentioning

confidence: 99%

“…This phenomenon was attributed to heat stress during the summer months (Bernabucci et al ., 2015). Moreover, decreases of α-, β- and κ-casein proportions and an increase of γ-casein proportion were reported in summer (Bernabucci et al ., 2015; Bär et al ., 2020). There were system × season interactions in contents of milk protein and casein (Table 1).…”

Section: Resultsmentioning

confidence: 99%

“…Milk produced from cows fed fresh grass is characterized by elevated proportions of polyunsaturated fatty acids (PUFA) such as α-linolenic acid (ALA; C18:3n3), conjugated linoleic acids (CLA), especially rumenic acid (RA; C18:2c9t11) and vaccenic acid (VA; C18:1t11) (Dhiman et al ., 1999; Leiber et al ., 2005 a ). Diet is the main factor affecting milk FA composition (Elgersma, 2015) where a strong relationship between the proportion of fresh grass and CLA content in milk exists (Couvreur et al ., 2006; Bär et al ., 2020). Other factors such as season (Auldist et al ., 1998; Rugoho et al ., 2014), stage of lactation (Auldist et al ., 1998) and grass composition (Collomb et al ., 2002; van Dorland et al ., 2008) also influence the milk fatty acid composition.…”

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confidence: 99%

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Effects of full-time v. part-time grazing on seasonal changes in milk coagulation properties and fatty acid composition

Akert

Kreuzer

Kunz

et al. 2021

Journal of Dairy Research

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For this research communication our objective was to investigate to what extent milk coagulation properties and milk fatty acid (FA) composition were affected by different feeding systems, season and their interaction. Eighteen cows in total were subjected to one of three different feeding system treatments: full-time grazing or part-time grazing combined with indoor feeding of fresh grass with low or high concentrate supplementation. Milk was sampled in spring, summer and autumn. Milk coagulation time was 15.0, 19.0 and 17.7 min, coagulation dynamics 1.67, 3.41 and 1.79 min, and curd firmness 52.7, 32.4 and 47.0 mm in spring, summer and autumn, respectively. Thus, milk coagulation properties of the milk were lower during summer. There were strong seasonal effects on milk FA proportions, but there were not always changes with progressing season, or changes were different with respect to the impact of the feeding systems (system × season interaction). The milk fat was favourably rich in oleic acid, conjugated linoleic acid and α-linolenic acid and had a low n-6/n-3 fatty acid ratio in all systems. Factors like seasonal variations in grass composition and the energy balance of the cows were considered relevant for the milk FA composition. Overall, seasonal variations in milk quality were less pronounced with part-time grazing with fresh grass indoors as compared to full-time grazing without concentrate.

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Whey protein fouling on polymeric heat exchangers

Pelz,

Noß,

von Harbou

et al. 2024

Heat Trans

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The fouling behavior of whey protein concentrate (WPC) in food‐grade polyether ether ketone (PEEK) heat exchangers was compared to benchmark stainless steel (SS) to evaluate if fouling can be better mitigated by using PEEK. No research has been conducted on WPC fouling behavior of PEEK at WPC concentrations of 2–6 g/L and heat flux densities of 45–55 kW/m2. It was found that PEEK materials led to a reduction in heat resistance of up to 40%. At WPC concentrations of 6 g/L, a fouling factor of 0.9 m2 K/kW was measured for PEEK compared to 1.6 m2 K/kW for SS. Despite a constant heat flux, fouling curves for PEEK showed an asymptotic behavior, whereas linear fouling was observed for SS. To achieve a comparable heat resistance between PEEK and SS heat exchangers, the operating time could be extended by 9 h when using PEEK materials. Investigations of the deposit mass showed that even though the heat transfer resistance is limited on PEEK, fouling continued to grow at a decreased rate. It was found that the fluid started to evaporate underneath the fouling layer, which led to a partial detachment of the fouling layer and therefore mitigated the heat resistance effects of fouling. To test whether these results are transferable to larger setups, experiments on a scale‐up apparatus were conducted. A very similar behavior was qualitatively observed; however, measured deposition deviated on average by 18%. PEEK surfaces also showed great promise regarding cleanability, with fouling layers detaching completely after drying for 10 min and restarting the process. This restored the heat transfer coefficient to its clean state. A cleaning in place therefore seems feasible. In contrast, fouling layers on SS did not detach through drying and had to be chemically cleaned to restore its heat transfer capacity.

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Impact of herbage proportion, animal breed, lactation stage and season on the fatty acid and protein composition of milk

Cited by 28 publications

References 47 publications

The Impact of Seasonality in Pasture-Based Production Systems on Milk Composition and Functionality

The Impact of Seasonality in Pasture-Based Production Systems on Milk Composition and Functionality

Effects of full-time v. part-time grazing on seasonal changes in milk coagulation properties and fatty acid composition

Whey protein fouling on polymeric heat exchangers

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