الفهرس 
Mineral utilizationOnly 14 pages are availabe for public view
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Abstract
The o~~enwotrk was carried out at t h e ex~erirnentt the Lepartment of Animal Procluction. Faculty of An-icultim Sheikh. Tanta Universi tv . Two experiments were coriducted in investigation. The f i r s t experiment included three Bark) average Ixy-y weight of 50 kg) to investigate the effect of feealrig wadit iona 1 spr ing and surruner r a t I ons on ininera1 11%i 1 i zati on. ?’he second experiment was carried out 01-1 14 dairy Friesian cows IFC) . 17 dairy buffaio cows (K). 12 Fk-iesian heifers (FH) and 16 b-iffalo heifers (X) tcl st.udv the effect. of dietary mineral levels of the t r a d i t i o n a l spri~xr and swmer- ra’c ions OII mineral concentration in h a i r . bled plasma and m i lk. Mineral concentr-ation in hair as an indicator of minel-al status of farm animals was also investiqated. The experimental rations fed to animals consist of:- 1- Spring ra%ion (concentrate mixture + berseem + rice straw) . 2- Summer ratlon (concentrate inixtu-e + rice straw). Results obtained from the present study could be summarized as follows:- 1- The f i r s t experiment:- 1-1- The apparent absorption and n e t retention oC Ca:Mg: Na: K: Cu and Fe as a percent of intake for spring r a t ion were 37.82, 24.04; 42.40. 37.40: 96.98. 5Y.25: 98.60. 80.43: 43.62. 38.14 and 44.26. 43.55. respectively . The cowespoi~dinq figures for summer rat ion were .37.50. 23.34:49.78. 4.17: 96.55, 56.27: 98.47. 79.23: 48.88. 43.58 and 45.52, 4.62, respectively. 1-2- ’The apparent absorption and net retention of P. Zn and Mn as a percent of intake were -31.62. -38.97 : -10.80. -16.30 and -13.5.3. -17.91 for spring ration and -10.14. -18.96:-6.38.-12.1b and-ll.b.3.-15.57 for smer ration. respectively. 2- The second experiment:- 2-1- ?he concentration(average of spring and summer seasons) of Ca, P,. Mg. Na. K, Cu. Zn. Mn. Fe (ppml and ash (%) in h a i r of FH and BH were 2274. 1770: 176. 146: 1412. 875: 1890. 1813: 5316. 480: 9.05, 9.24: 108.82, 106.27: 6.93. 6.54: 27.09. 23.14 ard 2.37, 2.02. respect ively. The c~xrespc~nclinf~igr ures for. FC and EC were 2184. 1592: 170. 145: 1217, 795: 1815. 1736: 4939. 4489: 8.51, 8.85; 104.75. 103.97: 6.50. 6.21: 37.74. 25.58 and 2.14.1.93.respectively. 2-2- The concentration of P. Zn and Mn in hair of these animals was Lxlow the c r i t i c a l level of these elements in h a i r . 2-3- ?he cmxentrat ion c~f mineral in hair increased by increasing the intake of mineral in summer- ration than spring r a t i o n . &,4- The concentr-ation of mineral in bled plasma and milk of Friesian and buffalo cows and their cn-owing heifers was lower than the nix-ma 1 levels or’ mineral in blscd plasma and mi lk .