scholarly journals The effects of supplementation with sunflower and soybean oils on the fatty acid profile of milk fat from grazing dairy cows

2005 ◽  
Vol 54 (1) ◽  
pp. 17-24 ◽  
Author(s):  
Oldemiro A. Rego ◽  
Henrique J.D. Rosa ◽  
Paula V. Portugal ◽  
Tiago Franco ◽  
Carlos M. Vouzela ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Dairy Cows ◽  
Fatty Acid Profile ◽  
Milk Fat ◽  
Soybean Oils ◽  
Grazing Dairy Cows

scholarly journals Postruminal infusion of calcium gluconate increases milk fat production and alters fecal volatile fatty acid profile in lactating dairy cows

2019 ◽  
Vol 102 (2) ◽  
pp. 1274-1280 ◽  
Author(s):  
John Doelman ◽  
Leslie L. McKnight ◽  
Michelle Carson ◽  
Kelly Nichols ◽  
Douglas F. Waterman ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Dairy Cows ◽  
Fatty Acid Profile ◽  
Calcium Gluconate ◽  
Milk Fat ◽  
Volatile Fatty Acid ◽  
Lactating Dairy Cows

scholarly journals Feeding Calcium Salts of Linseed Oil on Productive Performance and Milk Fatty Acid Profile in Grazing Dairy Cows

2020 ◽  
Vol 10 (04) ◽  
pp. 761-781
Author(s):  
Yaliska Moreno González ◽  
Jesica Iorio ◽  
María Florencia Olmeda ◽  
Dino Curletto ◽  
Daniel Scandolo ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Dairy Cows ◽  
Fatty Acid Profile ◽  
Linseed Oil ◽  
Milk Fatty Acid ◽  
Productive Performance ◽  
Calcium Salts ◽  
Grazing Dairy Cows

Effect of cereal grain and fibre supplements on the fatty acid composition of milk fat of grazing dairy cows in early lactation

2003 ◽  
Vol 70 (3) ◽  
pp. 257-265 ◽  
Author(s):  
Chakra Wijesundera ◽  
Zhiping Shen ◽  
William J Wales ◽  
Dawn E Dalley
Keyword(s):  
Fatty Acids ◽  
Fatty Acid Composition ◽  
Fatty Acid ◽  
Dairy Cows ◽  
Acid Composition ◽  
Milk Fat ◽  
Physiological State ◽  
Early Lactation ◽  
Cereal Grain ◽  
Grazing Dairy Cows

Two experiments were undertaken to determine the effects of cereal grain and fibre (hay or straw) supplements on the fatty acid composition of milk fat of grazing dairy cows in early lactation. In both experiments, grain supplements significantly increased (P<0·05) the proportion of the endogenously synthesized 10[ratio ]0–16[ratio ]0 fatty acids. Of the C18 acids, the proportion of 18[ratio ]0 and 18[ratio ]3 was significantly decreased (P<0·05) by grain supplementation, while that of 18[ratio ]2 was significantly increased (P<0·05). Irrespective of diet, 18[ratio ]1 trans-11 was the most dominant trans 18[ratio ]1 isomer in milk fat. In the first experiment, the proportions of the 18[ratio ]1 trans-11 isomer and conjugated linoleic acid (CLA, 18[ratio ]2 cis-9, trans-11) were highest for the pasture-only diets, and significantly (P<0·05) decreased with grain supplementation. The opposite result was observed in the second experiment, conducted in a different dairy region, suggesting that factors such as the quality of pasture on offer and the physiological state of the cow could affect the content of CLA and trans fatty acids in milk fat. In both experiments, there was a significant positive linear relationship between CLA and 18[ratio ]1 trans-11. Fibre supplements had little effect on the fatty acid composition of the milk.

Influence of pasture and concentrates in the diet of grazing dairy cows on the fatty acid composition of milk

2003 ◽  
Vol 70 (3) ◽  
pp. 267-276 ◽  
Author(s):  
C Richard Stockdale ◽  
Glen P Walker ◽  
William J Wales ◽  
Dawn E Dalley ◽  
Anne Birkett ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Dairy Cows ◽  
Milk Fat ◽  
Saturated Fatty Acids ◽  
High Energy ◽  
Short Term ◽  
Cereal Grain ◽  
Total Milk ◽  
High Concentrations ◽  
Grazing Dairy Cows

In five short-term experiments conducted in Victoria in 1997 and 1998, grazing dairy cows were given either pasture alone or pasture supplemented with high-energy concentrates, and the fatty acid profiles of milk fat were measured. We established the effects of these feeds on some aspects of milk fat of importance for human nutrition, but we specifically focused on the hypothesis that conjugated linoleic acid (CLA) concentrations in milk fat increase as pasture intake increases, and decrease as more concentrates are fed. In agreement with previous research, feeding fresh pasture alone resulted in high concentrations (1·0–1·8 g/100 g milk fat) of CLA. When the effect of level of pasture consumption on CLA content was examined, a significant positive relationship (r2=0·35; P<0·05) was obtained. When cereal grain concentrates were used to supplement pasture intake, the CLA content of milk fat generally declined (P<0·05), except where the amount of concentrates given led to a marked reduction in total milk fat concentration. The use of cereal grain concentrates also generally resulted in significant (P<0·05) increases in medium-chain saturated fatty acids, but always reduced the contribution of butyric acid to milk fat, from 4·5 to 3·9 g/100 g milk fat, on average.

scholarly journals Effects of Monensin and Dietary Soybean Oil on Milk Fat Percentage and Milk Fatty Acid Profile in Lactating Dairy Cows

2008 ◽  
Vol 91 (3) ◽  
pp. 1166-1174 ◽  
Author(s):  
O. AlZahal ◽  
N.E. Odongo ◽  
T. Mutsvangwa ◽  
M.M. Or-Rashid ◽  
T.F. Duffield ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Soybean Oil ◽  
Dairy Cows ◽  
Fatty Acid Profile ◽  
Milk Fat ◽  
Milk Fatty Acid ◽  
Fat Percentage ◽  
Lactating Dairy Cows

scholarly journals Changes in fatty acid profile and iodine content in milk as influenced by the inclusion of extruded rapeseed cake in the diet of dairy cows

2009 ◽  
Vol 54 (No. 5) ◽  
pp. 201-209 ◽  
Author(s):  
A. Veselý ◽  
L. Křížová ◽  
J. Třináctý ◽  
S. Hadrová ◽  
M. Navrátilová ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Dairy Cows ◽  
Fatty Acid Profile ◽  
Milk Fat ◽  
Daily Intake ◽  
Total Content ◽  
Iodine Content ◽  
Experimental Period ◽  
Iodine Concentration ◽  
Rapeseed Cake

The aim of the study was to evaluate the effect of extruded rapeseed cake in diets of dairy cows on changes in milk fatty acid profile and iodine content in milk and on the thyroid gland status. An experiment was carried out on four lactating Holstein cows divided into 2 groups – experimental (R) fed a diet based on extruded rapeseed cake and control (S) fed a diet based on extruded full-fat soya. The experiment was divided into 4 periods of 42 days (21 days of preliminary period and 21 days of experimental period). Samples of milk and blood were taken three times a week during the experimental period. DMI was not affected by the treatment (<i>P</i> > 0.05). Milk yield and 4% FCM were lower in R compared to S (<i>P</i> < 0.05). Percentages of milk fat and protein were higher in R than in S (<i>P</i> < 0.05). The total content of SFA and UFA was not affected by the treatment (<i>P</i> > 0.05). However, the content of MUFA in R was higher (34.71 g/100 g) and the content of PUFA was lower (4.00 g/100 g) than in S (32.14 and 5.54 g/100 g, respectively (<i>P</i> < 0.05). The contents of C18:2 and C18:3 isomers and metabolites in R were lower than in S (<i>P</i> < 0.05). The content of <I>cis</I>-9, <I>trans</I>-11 CLA and <I>trans</I>-10, <I>cis</I>-12 CLA was lower in R (0.71 and 0.016 g/100 g) compared to S (0.97 and 0.022 g/100 g, respectively, <i>P</i> < 0.05). The index of atherogenicity and peroxidisability in R was lower than in S (<i>P</i> < 0.05). The index of desaturation was not affected by the treatment (<i>P</i> > 0.05). The mean daily intake of glucosinolates (Gls) in R was 50.14 mmol and resulted in a significant decrease in iodine concentration in milk in R (196.7 &mu;g/l) in comparison with S (367.0 &mu;g/l, <i>P</i> < 0.05) resulting in the lower daily iodine output in milk in R compared to S (4.4 and 9.2 mg/day, respectively, <i>P</i> < 0.05). Concentrations of T<sub>3</sub> and T<sub>4</sub> in blood plasma were not affected by the treatment (<i>P</i> > 0.05).

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