scholarly journals Prediction of ruminal volatile fatty acid proportions of lactating dairy cows based on milk odd- and branched-chain fatty acid profiles: New models, better predictions

2012 ◽  
Vol 95 (7) ◽  
pp. 3926-3937 ◽  
Author(s):  
A.M. Bhagwat ◽  
B. De Baets ◽  
A. Steen ◽  
B. Vlaeminck ◽  
V. Fievez
Keyword(s):  
Fatty Acid ◽  
Dairy Cows ◽  
Volatile Fatty Acid ◽  
Chain Fatty Acid ◽  
Fatty Acid Profiles ◽  
Lactating Dairy Cows ◽  
New Models ◽  
Branched Chain

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

The rumen simulation technique (Rusitec) as a method to determine the in vitro carry-over period following monensin treatment by measuring volatile fatty acid molar proportions

1998 ◽  
Vol 22 ◽  
pp. 145-146
Author(s):  
E. D. Mackintosh ◽  
R. H. Phipps ◽  
H. J. Grubb
Keyword(s):  
Fatty Acid ◽  
Dairy Cows ◽  
Volatile Fatty Acid ◽  
Simulation Technique ◽  
The Past ◽  
Lactating Dairy Cows ◽  
Carry Over ◽  
Ionophore Monensin

Ruminant and ruminal responses to feeding the gram-positive ionophore, monensin, have been researched extensively over the past 20 years. A proportion of many such in vivo experiments have used a change-over design. In doing so, the researcher either paid no attention to or was reasonably confident that any possible carry-over effects would have dissipated. Evidence does exist which leads to an estimation of duration to maximum treatment effects but such comparable evidence surrounding the duration of carry-over to monensin treatment is not available.An in vivo trial was proposed at the Centre for Dairy Research (CEDAR), to investigate the ruminal effects of feeding monensin to lactating dairy cows with 4-week periods of which 3 weeks was for change-over and adaptation. Therefore, before conducting such an expensive experiment, in terms of both time and money, an in vitro study using the rumen simulation technique (Rusitec) was carried out to determine if 3 weeks was considered adequate to eliminate carry-over effects when measuring volatile fatty acid (VFA) molar proportions.

scholarly journals Diet with Concentrate Containing Durio zibethinus Murr Seed Meal: Nutrient Contents, Fatty Acid Profiles, In Vitro Characteristics, and Nutrient Digestibility in Dairy Cows

2019 ◽  
Vol 43 (4) ◽  
Author(s):  
Endang Sulistyowati ◽  
Irma Badarina ◽  
Sigit Mujiharjo ◽  
Tamrin Simbolon ◽  
Idop Rohani Purba
Keyword(s):  
Fatty Acid ◽  
Dairy Cows ◽  
Rice Bran ◽  
Nutrient Digestibility ◽  
Chain Fatty Acid ◽  
Seed Meal ◽  
Fatty Acid Profiles ◽  
Nutrient Contents ◽  
Durio Zibethinus

This research was to evaluate concentrate diet containing Durio zibethinus seed meal (DSM) on nutrient contents, fatty acid profiles, in vitro characteristics, and nutrients digestibility in dairy cows. The experiment was arranged in Latin Square 4 x 4 design with 4 lactating dairy cows in 4 periods in 2 weeks for each period. The treatments were diets with concentrate containing ratios of rice bran and DSM,  DC 35/12.5 (35% of Rice bran+ 12.5% of DSM), DC 27.5/20 (27.5% of Rice bran+ 20% of DSM), DC 20/27.5 (20% of Rice bran+ 27.5% of DSM) and DC 12.5/35 (12.5% of Rice bran+ 35% of DSM). Data were analyzed using analysis of variance (Anova), if any significant difference among treatment means were found, will be further analyzed using Duncan Multiple Range Test (DMRT). Results showed that 20% of  DSM supplemented in concentrate improved nutrient contents of crude protein, ether extract, medium chain fatty acid (MCFA), long chain fatty acid (LCFA), polyunsaturated fatty acid (PUFA), unsaturated fatty acid (UFA), and n6/n3. In vitro dry matter digestibility, organic matter digestibility, N-NH3, and total VFA were high in concentrate containing 35% DSM. However, in vivo digestibility evaluation showed nutrient intakes were no differences among treatments. Nutrient digestibility were found higher in diet with concentrate containing 27.5% of DSM. There were three different optimal levels could be suggested, 20% of DSM (for nutrient and fatty acid content), 27.5% of DSM (for nutrient digestibility), and 35% of DSM (for in vitro characteristics).  Supported by previous milk production, it was concluded that the 27.5% of DSM was suggested to be applied in concentrate for dairy cows.

A comparison between feeding systems (pasture and TMR) and the effect of vitamin E supplementation on plasma and milk fatty acid profiles in dairy cows

2005 ◽  
Vol 72 (3) ◽  
pp. 322-332 ◽  
Author(s):  
Jane K Kay ◽  
John R Roche ◽  
Eric S Kolver ◽  
Norman A Thomson ◽  
Lance H Baumgard
Keyword(s):  
Fatty Acid ◽  
Vitamin E ◽  
Dairy Cows ◽  
Milk Fat ◽  
Milk Fatty Acid ◽  
Fatty Acid Profiles ◽  
Milk Fat Depression ◽  
Lactating Dairy Cows ◽  
Dietary Treatments ◽  
Feeding Systems

Unidentified constituents in fresh pasture increase milk fat cis-9, trans-11 conjugated linoleic acid (CLA) concentration, and prevent milk fat depression, even though ruminal conditions conducive to reducing milk fat synthesis exist. One possible explanation is vitamin E (α-tocopherol), a constituent high in fresh pasture, but naturally low in conserved/dried forages and cereal grains. Twenty late-lactating dairy cows previously consuming a total mixed ration (TMR) were randomly allocated to one of two dietary treatments for 21 d: TMR (control; n=10); and TMR plus an additional 10000 i.u. α-tocopherol/d (VIT E; n=10). These cows were simultaneously compared with 13 late-lactation dairy cows previously grazing fresh pasture (PAS) balanced for age, parity and genetic merit. Average daily α-tocopherol intakes were approximately 468, 10520 and 1590 i.u./cow for the control, VIT E and PAS treatments, respectively. Dietary α-tocopherol supplementation (VIT E v. control) slightly increased milk fat content by 0·23 percentage units, but did not significantly alter milk fatty acid composition. Plasma trans-11 18[ratio ]1 (VA) content tended to increase and trans-10 18[ratio ]1 levels numerically declined following α-tocopherol supplementation suggesting possible changes in rumen biohydrogenation products. In addition, increased α-tocopherol intake in TMR-fed cows decreased serum urea levels and tended to alter milk fat 15[ratio ]0 suggesting changes in rumen microbial populations. However, when compared with cows grazing pasture, TMR-fed cows supplemented with α-tocopherol, still produced milk with lower cis-9, trans-11 CLA and VA, and higher trans-10 18[ratio ]1 concentrations suggesting α-tocopherol is not a primary reason for milk fatty acid profile differences between pasture and TMR-fed cows. Therefore, additional unknown pasture constituents favour production of fatty acids originating from the cis-9, trans-11 instead of the trans-10, cis-12 CLA biohydrogenation pathways.

scholarly journals Effects of feeding different linseed sources on omasal fatty acid flows and fatty acid profiles of plasma and milk fat in lactating dairy cows

2012 ◽  
Vol 95 (6) ◽  
pp. 3149-3165 ◽  
Author(s):  
A. Sterk ◽  
B. Vlaeminck ◽  
A.M. van Vuuren ◽  
W.H. Hendriks ◽  
J. Dijkstra
Keyword(s):  
Fatty Acid ◽  
Dairy Cows ◽  
Milk Fat ◽  
Fatty Acid Profiles ◽  
Lactating Dairy Cows
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