Advanced search
Start date
Betweenand
Related content
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Effect of dietary cation-anion difference on ruminal metabolism, total apparent digestibility, blood and renal acid-base regulation in lactating dairy cows

Full text
Author(s):
Martins, C. M. M. R. [1] ; Arcari, M. A. [1] ; Welter, K. C. [2] ; Goncalves, J. L. [1] ; Santos, M. V. [1]
Total Authors: 5
Affiliation:
[1] Univ Sao Paulo, Sch Vet Med & Anim Sci, Dept Nutr & Anim Prod, BR-13635900 Sao Paulo - Brazil
[2] Univ Sao Paulo, Sch Food Engn & Anim Sci, Dept Anim Sci, BR-13635900 Sao Paulo - Brazil
Total Affiliations: 2
Document type: Journal article
Source: ANIMAL; v. 10, n. 1, p. 64-74, JAN 2016.
Web of Science Citations: 3
Abstract

The present study aimed to evaluate the effect of dietary cation-anion difference (DCAD) on ruminal fermentation, total apparent digestibility, blood and renal metabolism of lactating dairy cows. Sixteen Holstein cows were distributed in four contemporary 4x4 Latin Square designs, which consisted of four periods of 21 days and four treatments according to DCAD: +290; +192; +98 and -71 milliequivalent (mEq)/kg dry matter (DM). Ruminal pH and concentrations of acetic and butyric acid increased linearly according to the increase of DCAD. Similarly, NDF total apparent digestibility linearly increased by 6.38% when DCAD increased from -71 to 290 mEq/kg DM {[}Y=65.90 (SE=2.37)+0.0167 (SE=0.0068)xDCAD (mEq/kg DM)]. Blood pH was also increased according to DCAD, which resulted in reduction of serum concentrations of Na, K and ionic calcium (iCa). To maintain the blood acid-base homeostasis, renal metabolism played an important role in controlling serum concentrations of Na and K, since the Na and K urinary excretion increased linearly by 89.69% and 46.06%, respectively, from -71 to 290 mEq/kg DM. Changes in acid-base balance of biological fluids may directly affect the mineral composition of milk, as milk concentrations of Na, K, iCa and chlorides were reduced according to blood pH increased. Thus, it can be concluded that the increase of DCAD raises the pH of ruminal fluid, NDF total apparent digestibility, and blood pH, and decreases the milk concentration of cationic minerals, as well as the efficiency of Na utilization to milk production. (AU)

FAPESP's process: 12/22165-9 - Composition and stability of milk of cows fed anionic diet
Grantee:Cristian Marlon de Magalhães Rodrigues Martins
Support Opportunities: Scholarships in Brazil - Master
FAPESP's process: 13/07041-4 - Effect of anionic diet for dairy cows on metabolism and milk casein concentration
Grantee:Verônica Lopes Schvartzaid
Support Opportunities: Scholarships in Brazil - Scientific Initiation
FAPESP's process: 12/23212-0 - Composition and stability of milk of cows fed anionic diet
Grantee:Marcos Veiga dos Santos
Support Opportunities: Regular Research Grants
FAPESP's process: 13/02227-2 - Effect of anionic diet on stability and milk composition of dairy cows
Grantee:Maria Libera Tietz Cavalcanti
Support Opportunities: Scholarships in Brazil - Scientific Initiation