1345 Monensin and levels of narasin on rumen metabolism in lambs during adaptation to high-concentrate diets

In a scientific economic experiment conducted in the experimental farm «Klenovo-Chegodaevo» (Moscow) on three groups of Holsteinized black-and-white cows with a milk yield of 7000 kg of milk per lactation, 10 heads in each, it was found that the inclusion in the diet of cows of the experimental groups tested protected fats (hydrogenated and fractionated) in the amount of 300 g per head per day, contributed to the tendency for more intensive metabolic processes in the rumen due to a slight increase in the concentration of volatile fatty acids by 5,6–7,4% and an increase in the mass of microorganisms in the contents of the rumen by 5,4–14,4% (P≥0,05). At the same time, an increase in the concentration of metabolic energy in the dry matter of the cows ration from 10,7 to 11,0 MJ / kg in the period from 21 to 120 days of lactation, due to the inclusion of protected fats in the diet of cows from the experimental groups, contributed to an increase in milk yield 4% fat content for 100 days of the experiment by 9,7% and 11,0% (P≤0,05), compared with the control, as well as the production of milk fat and protein, respectively by 9,6–11,0% (P≤0,05 in the second case) and 7,4–8,3%, feed costs expressed in ME decreased by 4,9–5,2%.

Download Full-text

Nitrogen and fatty acid rumen metabolism in cattle offered high or low polyphenol oxidase red clover silage

animal ◽

10.1017/s1751731118003294 ◽

2019 ◽

Vol 13 (8) ◽

pp. 1623-1634 ◽

Cited By ~ 1

Author(s):

M.R.F. Lee ◽

R. Fychan ◽

J.K.S. Tweed ◽

N. Gordon ◽

V. Theobald ◽

...

Keyword(s):

Fatty Acid ◽

Polyphenol Oxidase ◽

Red Clover ◽

Rumen Metabolism

Download Full-text

1347 Monensin and levels of narasin on rumen metabolism in lambs fed high-concentrate diets

Journal of Animal Science ◽

10.2527/jam2016-1347 ◽

2016 ◽

Vol 94 (suppl_5) ◽

pp. 651-651 ◽

Cited By ~ 1

Author(s):

D. M. Polizel ◽

S. S. Marques ◽

M. F. Westphalen ◽

M. H. Santos ◽

M. V. C. Ferraz Junior ◽

...

Keyword(s):

Rumen Metabolism

Download Full-text

Digestion in defaunated and refaunated sheep fed soybean oil hydrolysate or crushed toasted soybeans

Netherlands Journal of Agricultural Science ◽

10.18174/njas.v41i3.620 ◽

1993 ◽

Vol 41 (3) ◽

pp. 205-219

Author(s):

C.J. Van Nevel ◽

S. De Smet ◽

D.I. Demeyer

Keyword(s):

Total Lipid ◽

Microbial Growth ◽

Intestinal Tract ◽

Growth Efficiency ◽

Minor Effect ◽

Molar Percentage ◽

Rumen Metabolism ◽

Fermentation Pattern ◽

A Minor ◽

Microbial Growth Efficiency

Defaunated then refaunated sheep were given diets containing soyabean oil hydrolysate (SOH: 70 g/day) or an equivalent amount of lipids administered as crushed toasted soyabeans (TSB). Defaunation increased molar percentage of propionate in the rumen, while butyrate decreased. SOH caused a similar effect in both the defaunated and refaunated rumen, while the effect on acetate proportions was variable. Protozoal counts were lower after feeding SOH. Crushed toasted soyabeans had a minor effect on rumen fermentation pattern. Rumen digestibility of organic matter was decreased by both defaunation and SOH feeding, with a concomitant shift in digestion to the lower intestinal tract. Total tract digestibility was not affected. Both treatments increased nonammonia N flows at the duodenum, but this was only significant with defaunation. Total tract digestion of N remained almost constant. Defaunation resulted in more microbial protein reaching the duodenum. Except for the TSB diet, total lipid leaving the rumen equalled intake. Total tract digestibility of total lipid was much higher with SOH and TSB than with controls. Defaunation almost doubled microbial growth efficiency and this value tended to increase by SOH feeding. The decrease of protozoal count or even elimination of protozoa after lipid feeding could not entirely explain the change in rumen metabolism, as additional changes in defaunated sheep were shown.

Download Full-text