Fatty acid composition of milk from dairy cows fed fresh alfalfa based diets

Castillo, Alejandro; Taverna, Miguel Angel; Páez, Roxana; Cuatrín, Alejandra; Colombatto, D.; Bargo, F.; García, María I. Rodríguez; García, Pedro González; Chavez, Mónica S.; Beaulieu, A. D.; Drackley, J.K.

doi:10.1016/j.anifeedsci.2006.05.022

Cited by 14 publications

(10 citation statements)

References 32 publications

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“…The average CLA concentrations (1.16 g/100g FA) obtained were similar to 1.2 g percent, as previously reported for dairy cows grazing alfalfa pastures [63]. This feature is remarkable because CLA (especially the C18:2 cis-9 trans-11 isomer) plays an important role in regulating plasma lipids and cardiovascular functions, reducing cancer incidence, as well as blocking tumor growth and metastasis from cancer breasts [64].…”

Section: Nutritional Healthy Value Of Milksupporting

confidence: 62%

“…When pasture intake decreased from 100% to 33% of total DMI of cows, milk CLA content decreased from 2.21 to 0.89 g/100g FA [69]. A positive association between the proportion of alfalfa pasture in the diet and the content of CLA and VA in milk also was [63]. Apparently, even the lower contribution of pasture to total DMI in T10.5 (59.8%) compared to T3.5 (84.9%) was enough to retain milk bioactive FA concentration.…”

Section: Nutritional Healthy Value Of Milkmentioning

confidence: 73%

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Milk Yield and Composition and Pasture Ruminal Digestion in Grazing Dairy Cows Receiving Three Levels of Energy Concentrate Supplementation

Salado¹,

Bretschneider²,

Cuatrín³

et al. 2017

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The objective of the experiment was to determine the effect of feeding three levels (T3.5, T7.0 and T10.5) of energy concentrate (3.5, 7.0 and 10.5 kg cow −1 day −1 ) on total dry matter (DM) and energy intakes, milk yield and composition, nutritional value of milk and rumen pasture neutral detergent fiber (NDF) digestion in grazing dairy cows. Twenty-one multiparous Holstein cows in early lactation (70.2 ± 13 days postpartum) producing 37.1 (±4.7) kg of milk were assigned to a 3 treatments (7 cows/treatment) × 3 periods Latin square design. Parameters of ruminal environment and pasture NDF degradation were obtained using 3 additional cows of the same breed fitted with rumen cannulae. On a wet basis, concentrate was composed by corn grain (68%), soybean meal (22%), wheat bran (8%) and a vitamin-mineral nucleus with monensin. Pasture (Medicago sativa, sp) was used in a rotational grazing system with an herbage allowance of 30 kg DM cow) of fat corrected milk (4% FCM) resulted higher (p < 0.05) in T7.0 (29.0) compared to T3.5 (26.8) but similar to T10.5 (30.2). Milk and protein yields were linearly increased (p < 0.01) by concentrate intake. Milk fat (3.13 g/100g) and total solid contents (11.79 g/100g) did not differ whereas milk protein (p < 0.03) and casein (p < 0.01) levels (g/100g) increased linearly from 3.05 to 3.10 (protein) and from 2.42 to 2.47 (casein). Pasture intake decreased but total DM and energy consumption were enhanced showing addition effects after concentrate feeding. Body weight (BW) loss and plasmatic levels of non esterified 1136 Agricultural Sciences fatty acids (NEFA) decreased with concentrate intake. Circulating levels of insulin-like growth factor-I (IGF-I) were higher (p < 0.05) in T10.5 while those of glucose, plasma urea nitrogen, insulin and somatotrophin were not affected. Ruminal pH and acetate concentration resulted lower (p < 0.05) in T10.5 when compared to T3.5. The acetate:propionate ratio decreased (p < 0.01) from 4.25 in T3.5 to 3.08 in T10.5 and ruminal ammonia nitrogen levels tended (p < 0.07) to be lower as concentrate intake increased. Kinetics parameters of NDF degradation remained unchanged. The potential hypercholesterolemic fatty acids (FA) of milk (C12:0 to C16:0.) remained unchanged as concentrate intake increased. Milk content of linolenic acid decreased and the n−6:n−3 ratio increased with concentrate intake from 1.56 (T3.5) to 2.57 (T10.5) remaining below the recommended values for human health (<4:1). Milk content of antioxidant vitamins was not significantly altered even when pasture DM intake fall in T10.5 compared to T3.5. Increased consumption of a starch-rich concentrate up to 40% of DM intake of cows showed additive effects on total DM and energy intakes improving milk yield, milk protein and casein contents without negative effects on milk fat concentration or yield. Pasture fiber digestion and nutritional parameters linked to healthy value of milk fat were not affected.

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Section: Nutritional Healthy Value Of Milksupporting

confidence: 62%

Section: Nutritional Healthy Value Of Milkmentioning

confidence: 73%

Milk Yield and Composition and Pasture Ruminal Digestion in Grazing Dairy Cows Receiving Three Levels of Energy Concentrate Supplementation

Salado¹,

Bretschneider²,

Cuatrín³

et al. 2017

Self Cite

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“…Other studies looking at milk CLA levels on mixed clover pastures have shown little variation over the grazing period [16,41]. The variation in our results over the season may be specific to alfalfa grass mixes and is in agreement with other studies [34,42]. However, as this data was collected from a commercial not experimental situation the reality is was not as straightforward for a number of reasons: (i) Cows grazed different fields every 2-3 days which may have been at different stages of maturity; (ii) The proportion of alfalfa in the pasture would change over time depending on grazing pressure, soil moisture content and climatic conditions, specifically precipitation.…”

Section: Discussionsupporting

confidence: 82%

Grazing Period Variations in Cow Milk Vaccenic Acid (VA) and Conjugated Linoleic Acid (CLA)

erry¹,

Hydamaka²,

Noto³

2012

J Nutr Food Sci

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The primary objective of this study was to examine the effect of breed, lactation and grazing period on the cis 9, trans 11-Conjugated Linoleic Acid (c9,t11-CLA) and trans 11-Vaccenic Acid (VA) levels in cow's milk. The secondary objective was to compare the properties of cheese products made from the study milk to commercially available cheeses. Milk samples from a commercial dairy farm representing 3 breeds (Fleckvieh Cross, n=19; Holstein, n=18; Jersey, n=12) were analyzed at three points in the grazing period. Daily yield, CLA yield, VA, yield and the percentage of VA in milk were greatest in June, intermediate in July and lowest in September. The percentage of c9,t11-CLA in milk was lower in September compared to June and July. The VA and c9,t11-CLA content of cheese made from the milk samples were ~2-fold higher than commercially available samples of Cheddar and ~1.5-fold higher than commercially available samples of Mozzarella. In conclusion, the c9,t11-CLA and VA contents of milk decrease over the June through September grazing period, likely due to the grazing material.

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“…The availability of nutrients was highly dependant on seasonal climatic changes (Val-Arreola et al 2004) even on irrigated schemes when water availability could not be fully ensured. During certain periods, the forage ingested by cows was insufficient (an average of 4.5 kg of alfalfa DM per cow) while Holstein cow intake could reach as high as 15 kg of alfalfa DM (Castillo et al 2006). In contrast, milking and hygiene conditions were more homogeneous throughout the year on a given farm, which facilitated the characterisation of farm milking profiles with limited direct control of milk quality.…”

Section: Discussionmentioning

confidence: 93%

Effect of cattle management practices on raw milk quality on farms operating in a two-stage dairy chain

Sraïri

Benhouda

Kuper

et al. 2008

Trop Anim Health Prod

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In many developing countries, milk production varies greatly according to farm size, cattle breed, and milking practices. However, production systems often are dominated by smallholder farms. Therefore, relatively small volumes of milk are delivered daily from numerous farms to intermediate cooperatives which supply industrial units. This paper argues that in such two-stage dairy chains, milk quality could be improved by focusing on farming practices rather than on the testing of individual deliveries. Indeed, it is difficult to analyze their quality due to technical, economic, and logistic limitations. The objective of this study is to link on-farm practices with milk chemical quality parameters (fat and protein) and hygienic quality criteria (Aerobic Plate Count, APC and Coliforms). Cattle management practices were monitored monthly over one year on 23 farms located on an irrigation scheme in Morocco. 276 milk samples were analyzed. The monthly variability of milk quality parameters was then characterized. Results show that average cow milk chemical parameters vary within a normal range. They remain primarily linked to the genetic type of cows, the lactation stage, and the conversion of feed concentrates' net energy into milk. Overall milk hygienic quality was poor (APC and Coliforms counts were 100 fold international norms), due essentially to a lack of hygiene and inadequate milking conditions (hands, udder, and teat washing, type of bucket used, dirtiness of cows...). It is suggested that a close monitoring of herd management practices may allow the indirect control of milk quality parameters, thereby avoiding costly analyses of numerous smallholder milk deliveries.

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Fatty acid composition of milk from dairy cows fed fresh alfalfa based diets

Cited by 14 publications

References 32 publications

Milk Yield and Composition and Pasture Ruminal Digestion in Grazing Dairy Cows Receiving Three Levels of Energy Concentrate Supplementation

Milk Yield and Composition and Pasture Ruminal Digestion in Grazing Dairy Cows Receiving Three Levels of Energy Concentrate Supplementation

Grazing Period Variations in Cow Milk Vaccenic Acid (VA) and Conjugated Linoleic Acid (CLA)

Effect of cattle management practices on raw milk quality on farms operating in a two-stage dairy chain

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