scholarly journals Effect of Total Mixed Ration Particle Size on Rumen pH, Chewing Activity, and Performance in Dairy Cows

2003 ◽  
Vol 16 (12) ◽  
pp. 1755-1762 ◽  
Author(s):  
M. M. Schroeder ◽  
H. W. Soita ◽  
D. A. Christensen ◽  
G. R. Khorasani ◽  
J. J. Kennelly
Keyword(s):  
Particle Size ◽  
Dairy Cows ◽  
Total Mixed Ration ◽  
Rumen Ph ◽  
And Performance ◽  
Chewing Activity

Effects of lucerne hay and barley grain particle sizes on chewing activity, rumen pH and milk composition of Holstein dairy cows

2007 ◽  
Vol 2007 ◽  
pp. 130-130
Author(s):  
A.R. Bayat ◽  
R. Valizadeh ◽  
A.A. Nasserian
Keyword(s):  
Particle Size ◽  
Dairy Cows ◽  
Milk Fat ◽  
Milk Composition ◽  
Barley Grain ◽  
Particle Sizes ◽  
Milk Fat Depression ◽  
Rumen Ph ◽  
Maize Grain ◽  
Chewing Activity

NRC (2001) recommended 250 g/kg dietary neutral detergent fibre (NDF) with a minimum of 190 g/kg dietary forage NDF to prevent milk fat depression. This recommendation does not account for the differences in forage particle size. The forage particle size requirements of dairy cows fed barley grain-based diets can differ from those fed maize grain-based diets (Yang and Beauchemin, 2006). The objective of this experiment was to evaluate the effects of lucerne hay and barley grain particle sizes on chewing activity, rumen pH, milk yield and milk composition using barley grain-based diets.

scholarly journals Feeding forages with reduced particle size in a total mixed ration improves feed intake, total-tract digestibility, and performance of organic dairy cows

2019 ◽  
Vol 102 (10) ◽  
pp. 8839-8849 ◽  
Author(s):  
Andreas Haselmann ◽  
Katharina Zehetgruber ◽  
Birgit Fuerst-Waltl ◽  
Werner Zollitsch ◽  
Wilhelm Knaus ◽  
...  
Keyword(s):  
Particle Size ◽  
Dairy Cows ◽  
Feed Intake ◽  
Total Mixed Ration ◽  
Organic Dairy ◽  
And Performance

scholarly journals Effects of Alfalfa Particle Size and Specific Gravity on Chewing Activity, Digestibility, and Performance of Holstein Dairy Cows

2004 ◽  
Vol 87 (11) ◽  
pp. 3912-3924 ◽  
Author(s):  
A. Teimouri Yansari ◽  
R. Valizadeh ◽  
A. Naserian ◽  
D.A. Christensen ◽  
P. Yu ◽  
...  
Keyword(s):  
Particle Size ◽  
Specific Gravity ◽  
Dairy Cows ◽  
And Performance ◽  
Chewing Activity ◽  
Holstein Dairy Cows

The effect of reducing alfalfa hay cut length on TMR particle size distribution, rumen pH and chewing activity of cows in early lactation using Penn State Particles Separator(PSPS)

2005 ◽  
Vol 2005 ◽  
pp. 75-75
Author(s):  
A. Khezri ◽  
A. Nikkhah ◽  
A. Zare Shahneh ◽  
M. H. Fooladi
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Rumen Ph ◽  
Alfalfa Hay ◽  
Penn State ◽  
Nutritional Needs ◽  
Particle Length ◽  
Chewing Activity ◽  
Proper Length

The ability of a ration to meet the nutritional needs of a high yielding dairy cow requires understanding of both the chemical and physical characteristics of the ration (NRC, 2001). Having the proper particle size distribution (2 to 8 percent of the particles on the upper sieve, 30 to 50 percent on the middle and lower sieves, and no more than 20 percent on the bottom pan) of feeds is an important part of ration formulation. Chopping the crop at the proper length produces forages that can be combined to achieve the desired particle length in a TMR. The dairy cow’s need for increasingly higher levels of energy have led to diets relatively high in concentrates. However, cows still require adequate fibre in the ration to function properly (Allen, 2000). Adequate forage particle length is necessary for proper rumen function and reduced forage particle size has been shown to decrease the time spent chewing and cause a trend toward decreased rumen pH. When cows spend less time chewing, they produce less saliva, which is needed to buffer the rumen. The objective of this study was to evaluate the effects of reducing alfalfa hay length of cut on TMR particle size distribution, rumen pH and chewing activity using penn state particles separator.

scholarly journals Effects of Varying Dietary Forage Particle Size in Two Concentrate Levels on Chewing Activity, Ruminal Mat Characteristics, and Passage in Dairy Cows

2007 ◽  
Vol 90 (4) ◽  
pp. 1929-1942 ◽  
Author(s):  
Q. Zebeli ◽  
M. Tafaj ◽  
I. Weber ◽  
J. Dijkstra ◽  
H. Steingass ◽  
...  
Keyword(s):  
Particle Size ◽  
Dairy Cows ◽  
Chewing Activity

scholarly journals Effects of forages and total mixed rations particle size on physical effectiveness and chewing activity of lactating cows

2011 ◽  
Vol 27 (3) ◽  
pp. 935-942
Author(s):  
B. Stojanovic ◽  
G. Grubic ◽  
N. Djordjevic ◽  
A. Bozickovic ◽  
A. Ivetic
Keyword(s):  
Particle Size ◽  
Fiber Content ◽  
Corn Silage ◽  
Total Mixed Ration ◽  
Lactating Cows ◽  
Particle Length ◽  
Chewing Activity

In study are determined effects of four different mean lengths of corn silage, alfalfa haylage and total mixed ration (TMR) for lactating cows on physical effectiveness (pef), physically effective fiber content (peNDF) and total chewing activity. High correlations were found between mean particle length of forages and TMR and their physical effectiveness in lactating cows nutrition as also with physically effective fiber content. Significant effect of ration particle size on stimulating total chewing activity of lactating cows was determined.

505 Late-Breaking: Ruminal Microbiota, Inflammation Cytokines, and Performance of High-yield Dairy Cows Supplemented with Saccharomyces Cerevisiae Culture

2021 ◽  
Vol 99 (Supplement_3) ◽  
pp. 179-180
Author(s):  
Xiaoge Sun ◽  
Shu Zhang ◽  
Erdan Wang ◽  
Na Lu ◽  
Wei Wang ◽  
...  
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Dairy Cows ◽  
Milk Yield ◽  
Relative Abundance ◽  
Milk Fat ◽  
Rumen Fluid ◽  
High Yield ◽  
Rumen Ph ◽  
And Performance ◽  
Inflammation Cytokines

Abstract Dramatic increases in milk yields in recent decades have created challenges in terms of rumen pH and microbial health which ultimately impact dairy cow health. The objective of this study was to assess the effects on ruminal pH, Volatile Fatty Acid (VFA), microbiota, inflammation, and performance of high-yield dairy cows by supplementing Saccharomyces cerevisiae culture (SC). Forty Holstein cows were divided into two groups based on their milk yield, days of milk, and parity fed the same basal ration diet that did or did not contain 100 g of SC /cow per day. Individual dry matter intake (DMI) and milk yield were recorded each day. Rumen fluid and milk samples were collected after 2 hours of morning feeding at intervals of 15 days during the experiment period. The data showed that rumen pH was increased by 0.19 (P = 0.09) when SC was supplemented than no SC was provided. SC-supplemented cow consumed 0.28 kg (P < 0.05) extra DM/d. Those supplemented with SC produced 1.36 kg (P < 0.05) more milk/cow per day than did non-supplemented cows. Milk fat percentage was higher (4.11 vs. 3.96%) for cows receiving SC. There were no differences in milk protein percentage. Rumen fluid VFA concentration was not statistically affected by SC but was numerically higher acetic and lower propionic for supplemented cows. The blood of the SC group with lower inflammation cytokines and somatic cell count (SCC). SC-supplemented cows had a greater relative abundance of Prevotellaceae, Succinivibrionaceae, Fibrobacteraceae, Lactobacillaceae, and lower relative abundance of Spirochaetaceae, Methanobacteriaceae, Enterobacteriaceae than the unsupplemented cows. It had greater functions on xylanolysis, fermentation, cellulolysis in the rumen in terms of the KEGG function prediction analysis. This study demonstrated that high-yield lactation cows receiving supplemental SC produced more milk and potentially reduced the inflammation and enhanced rumen cellulolysis bacteria growth.

scholarly journals Effects of a Change from an Indoor-Based Total Mixed Ration to a Rotational Pasture System Combined With a Moderate Concentrate Feed Supply on Rumen Fermentation of Dairy Cows

Animals ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 205 ◽  
Author(s):  
Julia Hartwiger ◽  
Melanie Schären ◽  
Sarah Potthoff ◽  
Liane Hüther ◽  
Susanne Kersten ◽  
...  
Keyword(s):  
Dairy Cows ◽  
Surface Area ◽  
Dry Matter ◽  
Absorption Rate ◽  
Volatile Fatty Acids ◽  
Transition Period ◽  
Absorption Capacity ◽  
Total Mixed Ration ◽  
Rumen Ph ◽  
Increased Risk

In spring, transition from a total mixed ration (TMR) to pasture requires rumen adaptions for the cow. It had been shown that transition period does not necessarily mean an increased risk for subacute ruminal acidosis (SARA). After adaption to pasture, however, supplying low amounts of concentrate did indicate increased risk, but caused no adverse effects on rumen morphology and absorption capacity. The present study aimed to investigate the effect of transition, and how a supply of 4.5 kg dry matter concentrate·cow−1 · day−1 during fulltime grazing influenced different rumen parameters. During a 12-week trial eleven rumen-cannulated dairy cows were observed during transition from confinement to pasture (PG; n = 6) and compared to cows fed TMR indoors (CG; n = 5). The CG stayed on a TMR based ration (35% corn silage, 35% grass silage, 30% concentrate; dry matter basis), whereas the PG slowly switched to a pasture-based ration (week 0 and 1 = TMR, week 2 = TMR and 3 h pasture·day−1, week 3 and 4 = TMR and 12 h pasture·day−1, and week 5 to 11 = pasture combined with 4.5 kg DM concentrate · cow−1·day−1). Papillae surface area decreased during transition and increased again during fulltime grazing, while the fractional absorption rate of volatile fatty acids (VFA) was not influenced. This suggests only a limited effect of papillae surface area on VFA absorption rate. Feeding changes resulted in different fermentation profiles of VFA. Changing ratio of starch to sugar during transition to fulltime grazing plus concentrate supply did not lead to lower rumen pH. In conclusion, the concentrate supply combined with high fermentable grass during fulltime grazing increased papillae surface area but did not affect absorption rate or rumen pH, so that risk for SARA was not increased.

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