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The logistic curve as a tool to describe the daily ruminal pH pattern and its link with milk fatty acids

Ellen Colman UGent, BM Tas, Willem Waegeman UGent, Bernard De Baets UGent and Veerle Fievez UGent (2012) JOURNAL OF DAIRY SCIENCE. 95(10). p.5845-5865
abstract
Daily ruminal pH variation can be summarized by a cumulative logistic curve based on the amount of time below multiple pH points and characterized by 2 parameters (beta(0) and beta(1)). Moreover, rumen pH variation affects the rumen microbiome as well as the biohydrogenation pathways resulting in a modified secretion of milk fatty acids (FA). The aims of this study were to assess the shifts in milk FA due to rumen pH changes and to estimate the relationship between milk FA and the 2 parameters of the logistic curve. The data consisted of milk samples of 2 experiments. In experiment 1, 3 cows were subjected to 5 treatments in which the type and amount of concentrate were changed during 33 d: (1) control diet 1, (2) stepwise replacement of a standard concentrate (CONC) by a CONC rich in rapidly fermentable carbohydrates, (3) increase in the total amount of CONC, (4) treatment with a buffer solution, and (5) control diet 2. A 3 x 3 Latin square design with 3 cows was used in the second experiment. During the first 14 d of each period, the cows received a control diet with a standard CONC, whereas in the last 7 d the standard CONC was replaced step-by-step by a CONC rich in rapidly fermentable carbohydrates and the amount of GONG was increased. During each period, a different buffer treatment was added to the diet. Milk FA and pH reacted similarly in both experiments: decreasing proportions of iso FA and increasing proportions of odd-chain FA were observed. However, an abrupt change to a 76% CONC diet as for one cow of experiment 1 led to almost a 10-fold increase in C18:1 trans-10 (0.79 vs. 6.75 g/100 g of FA). In experiment 2, the stepwise approach of adding CONC and the continuous supplementation of buffer led to minimal increases in C18:1 trans-10 and decreases in rumen pH compared with the diet with standard CONC only. Fatty acid proportions were influenced by the level of rumen pH (beta(1)) or the rumen pH variation (beta(0)), or both. High proportions of C18:1 trans-10 (above 4 g/100 g of FA) occurred with low and largely fluctuating pH (low beta(1), low beta(0)), whereas situations with low, stable pH (low beta(1), great beta(0)) did not induce a shift toward the secondary biohydrogenation pathway. C18:1 trans-11 and C18:2 cis-9, trans-11 were only influenced by the pH variation and not by the average pH, whereas iso C14:0 and iso C16:0 FA were only dependent on the average pH and not influenced by diurnal pH variation. Overall, milk FA changes were related to pH changes; however, this relationship is not straightforward and needs further research.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
milk fatty acid, acidosis, rumen pH, LACTATING DAIRY-COWS, CONJUGATED LINOLEIC-ACID, FEEDING-BEHAVIOR, HIGH-CONCENTRATE, RUMEN BACTERIA, BIOHYDROGENATION, FERMENTATION, PRODUCTIVITY, PROFILE, HERDS
journal title
JOURNAL OF DAIRY SCIENCE
J. Dairy Sci.
volume
95
issue
10
pages
5845 - 5865
Web of Science type
Article
Web of Science id
000309084600040
JCR category
AGRICULTURE, DAIRY & ANIMAL SCIENCE
JCR impact factor
2.566 (2012)
JCR rank
3/54 (2012)
JCR quartile
1 (2012)
ISSN
0022-0302
DOI
10.3168/jds.2011-5130
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
3065932
handle
http://hdl.handle.net/1854/LU-3065932
date created
2012-12-05 15:16:01
date last changed
2012-12-06 09:54:52
@article{3065932,
  abstract     = {Daily ruminal pH variation can be summarized by a cumulative logistic curve based on the amount of time below multiple pH points and characterized by 2 parameters (beta(0) and beta(1)). Moreover, rumen pH variation affects the rumen microbiome as well as the biohydrogenation pathways resulting in a modified secretion of milk fatty acids (FA). The aims of this study were to assess the shifts in milk FA due to rumen pH changes and to estimate the relationship between milk FA and the 2 parameters of the logistic curve. The data consisted of milk samples of 2 experiments. In experiment 1, 3 cows were subjected to 5 treatments in which the type and amount of concentrate were changed during 33 d: (1) control diet 1, (2) stepwise replacement of a standard concentrate (CONC) by a CONC rich in rapidly fermentable carbohydrates, (3) increase in the total amount of CONC, (4) treatment with a buffer solution, and (5) control diet 2. A 3 x 3 Latin square design with 3 cows was used in the second experiment. During the first 14 d of each period, the cows received a control diet with a standard CONC, whereas in the last 7 d the standard CONC was replaced step-by-step by a CONC rich in rapidly fermentable carbohydrates and the amount of GONG was increased. During each period, a different buffer treatment was added to the diet. Milk FA and pH reacted similarly in both experiments: decreasing proportions of iso FA and increasing proportions of odd-chain FA were observed. However, an abrupt change to a 76\% CONC diet as for one cow of experiment 1 led to almost a 10-fold increase in C18:1 trans-10 (0.79 vs. 6.75 g/100 g of FA). In experiment 2, the stepwise approach of adding CONC and the continuous supplementation of buffer led to minimal increases in C18:1 trans-10 and decreases in rumen pH compared with the diet with standard CONC only. Fatty acid proportions were influenced by the level of rumen pH (beta(1)) or the rumen pH variation (beta(0)), or both. High proportions of C18:1 trans-10 (above 4 g/100 g of FA) occurred with low and largely fluctuating pH (low beta(1), low beta(0)), whereas situations with low, stable pH (low beta(1), great beta(0)) did not induce a shift toward the secondary biohydrogenation pathway. C18:1 trans-11 and C18:2 cis-9, trans-11 were only influenced by the pH variation and not by the average pH, whereas iso C14:0 and iso C16:0 FA were only dependent on the average pH and not influenced by diurnal pH variation. Overall, milk FA changes were related to pH changes; however, this relationship is not straightforward and needs further research.},
  author       = {Colman, Ellen and Tas, BM and Waegeman, Willem and De Baets, Bernard and Fievez, Veerle},
  issn         = {0022-0302},
  journal      = {JOURNAL OF DAIRY SCIENCE},
  keyword      = {milk fatty acid,acidosis,rumen pH,LACTATING DAIRY-COWS,CONJUGATED LINOLEIC-ACID,FEEDING-BEHAVIOR,HIGH-CONCENTRATE,RUMEN BACTERIA,BIOHYDROGENATION,FERMENTATION,PRODUCTIVITY,PROFILE,HERDS},
  language     = {eng},
  number       = {10},
  pages        = {5845--5865},
  title        = {The logistic curve as a tool to describe the daily ruminal pH pattern and its link with milk fatty acids},
  url          = {http://dx.doi.org/10.3168/jds.2011-5130},
  volume       = {95},
  year         = {2012},
}

Chicago
Colman, Ellen, BM Tas, Willem Waegeman, Bernard De Baets, and Veerle Fievez. 2012. “The Logistic Curve as a Tool to Describe the Daily Ruminal pH Pattern and Its Link with Milk Fatty Acids.” Journal of Dairy Science 95 (10): 5845–5865.
APA
Colman, Ellen, Tas, B., Waegeman, W., De Baets, B., & Fievez, V. (2012). The logistic curve as a tool to describe the daily ruminal pH pattern and its link with milk fatty acids. JOURNAL OF DAIRY SCIENCE, 95(10), 5845–5865.
Vancouver
1.
Colman E, Tas B, Waegeman W, De Baets B, Fievez V. The logistic curve as a tool to describe the daily ruminal pH pattern and its link with milk fatty acids. JOURNAL OF DAIRY SCIENCE. 2012;95(10):5845–65.
MLA
Colman, Ellen, BM Tas, Willem Waegeman, et al. “The Logistic Curve as a Tool to Describe the Daily Ruminal pH Pattern and Its Link with Milk Fatty Acids.” JOURNAL OF DAIRY SCIENCE 95.10 (2012): 5845–5865. Print.