| Grant number: | 12/23212-0 |
| Support Opportunities: | Regular Research Grants |
| Start date: | March 01, 2013 |
| End date: | February 28, 2015 |
| Field of knowledge: | Agronomical Sciences - Animal Husbandry - Animal Production |
| Principal Investigator: | Marcos Veiga dos Santos |
| Grantee: | Marcos Veiga dos Santos |
| 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 cation-anion balance of the diet of lactating cows alter milk stability. The objective of the study is to evaluate the effect of cation-anion balance of the diet for dairy cows on production, milk composition and stability. Will be used 16 Holstein dairy cows in the middle stage of lactation (> 100 <200 days) with an mean milk yield mean of 25 kg / day, and a body weight mean of 600 kg, distributed in 4 contemporary Latin squares 4 x 4, with 4 periods of 21 days and 4 treatments. Cows will be housed in the stable type "free-stall", fed twice daily with individual control of food intake and regime two milkings. To reduce the cation-anion balance of the diet, cows will receive increasing levels of ammonium sulfate according to treatment. Will be used four experimental diets with forage base of corn silage: 1) +275 mEq / kg DM, 2) +175 mEq / kg DM, 3) 75 mEq / kg DM; -75 mEq / kg DM. The dependent variables to be evaluated are: dry matter intake, milk composition and stability, subunit casein, concentration of ionized calcium in milk, blood, urinary and rumen parameters. (AU)
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