In order to study the chemical composition, mineral contents and protein quality of poultry byproduct meal (PBPM), 10 composed samples of PBPM produced in Iran were provided during two months sampling period from rendering units of three industrial poultry slaughterhouses. The proximate analysis showed that the average dry matter (DM), ether extract (EE), crude protein (CP), crude fiber (CF) and ash of the PBPM samples were 94.8, 23.4, 60.5, 0.90, and 9.3 percent, respectively. The average gross energy (GE) value for the PBPM samples was 5645 kcal kg. The average values of major elements including Ca, P, Na,-1

No abstract

In nutrition of dry cows use diets with low dietary cation-anion difference (DCAD) for preventing milk fever. Therefore, anionic salts are used for reduce DCAD of diet that are caused subacute metabolic acidosis and following stimulation of PTH and 1, 25(OH2) D3 and result to calcium reabsorbing from gut and its transition from bone, so calcium concentration of blood is increased. Anionic salts caused increase calcium excretion of urine and decreasing pH. The objective of the present study was to evaluate the effect of diets with different DCAD on physiological characteristics of Holstein heifers.