Feeding low DCAD during the 3 to 4 wk before calving had beneficial effects on systemic acid-base status, calcium metabolism, prepartum health and also postpartum productive performance (Horst et al.
In addition, manipulating DCAD might benefit lactating dairy cows immediately after calving to about 50 d postpartum (Chan et al.
The objectives of this study were to determine the interaction effects of prepartum and postpartum diets with different levels of DCAD on plasma and urine concentration of mineral elements, acid-base balance, calcium homeostasis, DMI, milk production and health status in dairy cows.
Four DCAD diets were randomly allotted to four groups, with ten lambs in each group.
Key Words : DCAD, Thalli Lambs, Nitrogen and Calcium Balance, Growth)
The DCAD affects the acid-base status (Sanchez, 2003; Shahzad et al.
It seems that either positive or negative DCAD diets can be fed prepartum to Holstein cows as long as K in the cationic diet is below 1.
35 -- Calculated DCAD (5) +28 -138 -- (1) From NEDHIA Forage Laboratory, Ithaca, NY, analyses of components.
The low Na and S concentrations and their narrow range in forages, on one hand, and the common lack of sulfur deficiency and need for Na supplementation in all current dairy cattle diets, on the other hand, suggest the need to investigate the feasibility of disregarding these elements in DCAD calculation.
The choice of the set composition was influenced by our interest in obtaining a wide range of mineral concentrations and DCAD values.
Thus, a trial will be implemented in which steers will be fed DCAD diets for 14 days and then supplemented with a vitamin enriched diet for 9 days prior to slaughter to increase meat tenderness.
A DCAD modified diet could be supplied to increase calcium mobilization ability from bone tissue and the activity of 1, 25 dihydroxy cholecalciferol in renal tissue over 14 days (697 to 711 days of age).