Milk fatty acid composition of unsupplemented dairy cows grazing on a tropical pasture

Dias, Kamila Maciel; Gama, Marco Antônio Sundfeld da; Schmitt, Daniel; Sbrissia, André Fischer

doi:10.1590/rbz4820190088

Cited by 5 publications

(3 citation statements)

References 33 publications

(41 reference statements)

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“…Similar results regarding MUFA contents were reported in [48,51]. Higher MUFA and PUFA content in cow's milk on wet pasture were reported in [52].…”

Section: Discussionsupporting

confidence: 87%

Influence of Changes in Botanical Diversity and Quality of Wet Grasslands through Phenological Phases on Cow Milk Fatty Acid Composition

et al. 2020

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Natural pastures in Montenegro, together with natural meadows, are the most important forage source and comprise 95% of the used agricultural area (UAA). The aim of this study was to estimate the changes in grassland biomass, chemical and floristic composition and fatty acid composition in milk of cows grazed on Agrostis stolonifera semi-natural wet grassland in the Central region of Montenegro. Investigation was conducted during three phenological phases: early vegetative, optimal vegetative and full reproductive phase. The chemical composition of the grassland biomass was changed through the phenological phases. A significant increase during the experimental period in the content of dry matter and crude fibers and a decrease in crude protein content were determined. The pasture community consisted of 52 species, belonging to 19 families. The total amount of plant species classified as excellent, very good and good quality was 7.69%, while medium quality plants amounted to 13.46%, low quality plants to 19.23%, valueless plants to 34.62% and toxic plants to 25%. The total quality index was 4.166. The highest quality index of this community was in the second phenological phase, then in the third phase the lowest quality was in the first phenological phase. According to the floristic composition and biomass quality, this lowland pasture can be qualified as being of moderate to good quality. The content of milk fat, protein and solid non-fat (SNF) was increased from the first to the third vegetation phase, but the differences between the phases were not significant (p > 0.05). The content of a majority of saturated fatty acids (SFAs) also increased, while the total content of monounsaturated fatty acids (MUFAs) was high in the second phase and decreased significantly in the third phase. The content of polyunsaturated fatty acids (PUFAs) was constant in the first two phases, while it significantly decreased in the third phase. The highest content of most of MUFAs and PUFAs was obtained in the second phenological phase. The content of fatty acids in the third phase significantly affected (p < 0.05) by the phenological phase. This research contributes to the improvements in the grazing management of wet grasslands as well as the animal performances (milk yield and quality of milk).

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“…Similar results regarding MUFA contents were reported in [48,51]. Higher MUFA and PUFA content in cow's milk on wet pasture were reported in [52].…”

Section: Discussionsupporting

confidence: 87%

Influence of Changes in Botanical Diversity and Quality of Wet Grasslands through Phenological Phases on Cow Milk Fatty Acid Composition

et al. 2020

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“…and sugarcane appear to produce milk with a less desirable FA profile (e.g. lower proportions of RA and C18:3 n‐3, and a higher proportion of C16:0) than cows grazing on pastures of Panicum , Pennisetum and Cynodum ssp., although differences among forage species and cultivars within the same genus also seem to exist (Dias et al, 2019). Finally, there is recent evidence that cows consuming cactus Opuntia cladodes produce milk with a singular FA composition, notably the low proportions of C18:0 (Gama et al, 2021).…”

Section: Methodsmentioning

confidence: 99%

Phenotypic variation in milk fatty acid composition and its association with stearoyl‐CoA desaturase 1 (SCD1) gene polymorphisms in Gir cows

Matosinho

Fonseca

Peixoto

et al. 2023

J Animal Breeding Genetics

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Individual variation in milk fatty acid (FA) composition has been partially attributed to stearoyl‐CoA desaturase 1 (SCD1) gene polymorphisms in taurine breeds, but much less is known for Zebu breeds. This study investigated the phenotypic variation in milk FA composition, and the influence of SCD1 variants on this trait and on milk fat desaturase indices (DI) in Gir cows. The functional impact of SCD1 variants was predicted using bioinformatics tools. Milk and blood samples were collected from 312 cows distributed in 10 herds from five states of Brazil. SCD1 variants were identified through target sequencing, and milk FA composition was determined by gas chromatography. Phenotypic variation in milk FA composition fell within the range reported for taurine breeds, with SCD18 index showing the lowest variation among the DI. Fourteen SCD1 variants were identified, six of which not previously described. Regarding the A293V polymorphism, all cows were homozygous for the C allele (coding for alanine), whereas all genotypes were detected for the second SNP affecting the 293 codon (G > A), with compelling evidence for functional effects. Significant associations (based on raw p‐values) were found between this SNP and C12:0, cis‐9, trans‐11 CLA and short‐chain FA, and between another SNP (rs523411937) and C15:0 and odd‐chain linear FA. A new SNP on Chr26:21277069 was associated with trans‐11 C18:1, cis‐9, trans‐11 CLA, C18:3 n‐3 and n‐3 FA. These findings indicate that SCD1 polymorphisms also contributes to the phenotypic variation in milk FA composition of Gir cows, with potential use in their breeding programmes.

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“…There is also the supplementation of animals with hay and concentrated food in times of lower forage production, carried out by the most of farmers (90.7%). Traditionally, BSE sheep were not supplemented with concentrates, although on recent years this practice has become common [22]. In times of greater feeding needs, such as the period before mating, the last third of gestation and the first stage of lactation, could be essential the use of supplementation with concentrated foods to deal with the increased production needs of the sheep [23].…”

Section: Feed Managementmentioning

confidence: 99%

Characterization of dairy sheep farms in the Serra da Estrela PDO region

Monteiro

Santos

2021

Open Agriculture

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Sheep farming plays a key role in the sustainability of the most depressed rural regions of Portugal, particularly in the Serra da Estrela region, and is recognized as an important source of income for many local farmers. Thus, the management of local sheep breeds in the region has over generations given rise to its most emblematic product: Serra da Estrela cheese, with Protected Designation of Origin (PDO). This study aims to briefly describe the sheep farms producing certified milk in the Serra da Estrela region. To this end, a survey form was drawn up and applied to 75 farms, randomly selected, from the defined geographical area of Serra da Estrela, from June to August 2020. The results show that the producers, mostly male, have an average age close to 51 years. On average, the herd size is equal to or greater than 100 animals and the daily milk production per animal varies between 0.47 and 1.0 L. The price of milk paid to the producer is, on average, at 1.25 Euros/L. Both the average herd size and the lactation length are higher than those described by others. The average daily milk production in most of these farms is in accordance with the standard average value related by other authors.

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Milk fatty acid composition of unsupplemented dairy cows grazing on a tropical pasture

Cited by 5 publications

References 33 publications

Influence of Changes in Botanical Diversity and Quality of Wet Grasslands through Phenological Phases on Cow Milk Fatty Acid Composition

Influence of Changes in Botanical Diversity and Quality of Wet Grasslands through Phenological Phases on Cow Milk Fatty Acid Composition

Phenotypic variation in milk fatty acid composition and its association with stearoyl‐CoA desaturase 1 (SCD1) gene polymorphisms in Gir cows

Characterization of dairy sheep farms in the Serra da Estrela PDO region

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