| Grant number: | 13/02227-2 |
| Support Opportunities: | Scholarships in Brazil - Scientific Initiation |
| Start date: | April 01, 2013 |
| End date: | March 31, 2014 |
| Field of knowledge: | Agronomical Sciences - Animal Husbandry - Animal Nutrition and Feeding |
| Principal Investigator: | Marcos Veiga dos Santos |
| Grantee: | Maria Libera Tietz Cavalcanti |
| 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 cows in the middle stage of lactation (> 100 <200 days) with an average production of 25 kg / day, and average body weight 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 receive increasing levels of ammonium sulfate per 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: milk production, milk composition, stability, subunit casein concentration of ionized calcium in milk. | |
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