Effect of anionic diet for dairy cows on metabolism and milk casein concentration

• Grant number: 13/07041-4
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: June 01, 2013
• End date: May 31, 2014
• Field of knowledge: Agronomical Sciences - Animal Husbandry - Animal Nutrition and Feeding
• Principal Investigator: Marcos Veiga dos Santos
• Grantee: Verônica Lopes Schvartzaid
• Host Institution: Faculdade de Medicina Veterinária e Zootecnia (FMVZ). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

The hypothesis of this study is that the reduction of the dietary cation-anion balance of dairy cows modifies milk minerals and kappa-casein concentrations. The aim of this study is evaluate the effect of dietary cation-anion balance on milk and urine minerals concentration and also on milk alpha S1, alpha S2, beta e kappa-casein content in milk. Sixteen holstein cows between 100-200 days in lactation, with 25kg per day milk yield and approximated 600kg of body weight will be arranged in 4x4 Latin squares with 4 periods of 21 days and 4 treatments. They will be settled in free-stall stable, fed twice a day with individual consume control and milked twice a day. To reduce dietary cation-anion balance, cows will receive increasing quantities of ammonium sulfate according to individual treatment. Four experimental diets will be used: 1) +275 mEq/Kg diet DM; 2) +175 mEq/Kg diet DM; 3) 75 mEq/Kg diet DM; -75 mEq/Kg diet DM. The following dependent variables will be analyzed: casein subunits content, blood parameters and milk and urine minerals concentrations.

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

MARTINS, C. M. M. R.; ARCARI, M. A.; WELTER, K. C.; GONCALVES, J. L.; SANTOS, M. V.. Effect of dietary cation-anion difference on ruminal metabolism, total apparent digestibility, blood and renal acid-base regulation in lactating dairy cows. ANIMAL, v. 10, n. 1, p. 64-74, JAN 2016. (12/22165-9, 13/07041-4, 12/23212-0, 13/02227-2)

MARTINS, C. M. M. R.; ARCARI, M. A.; WELTER, K. C.; NETTO, A. S.; OLIVEIRA, C. A. F.; SANTOS, M. V.. Effect of dietary cation-anion difference on performance of lactating dairy cows and stability of milk proteins. JOURNAL OF DAIRY SCIENCE, v. 98, n. 4, p. 2650-2661, APR 2015. (12/22165-9, 13/07041-4, 12/23212-0, 13/02227-2)