الفهرس 
Material and methodsOnly 14 pages are availabe for public view
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Abstract
The present investigation was carried out on 483 adult Egyptian sheep
aged from (2 - 6 years) grazed on natural vegetation in their feeding without
any supplements of concentrates rations and depended mainly on well water
in their drinking. Animals grazed all over the day and returned home at the
evenmg.
The present investigation was carried out on two locations Sidi Barrani
(Block 1) and El- Hammam (Block 2) during rainy and dry seasons. Samples
which taken from both locations during rainy and dry seasons included
serum. forages. soil and Water samples. These samples were used for
determination of calcium, phosphorus, magnesium, copper, zinc, iron and
selenium concentrations.
The study revealed that:
The mean serum calcium concentrations of sheep showed significant
decreased levels (p < 0.001) in block 1 in rainy season as compared with
block 1 in dry season and block 2 in rainy and dry season. The obtained
values for serum Ca concentrations showed also, 2.7% of values below
critical value in block 1 in rainy season as compared with dry season and
block 2 in dry and rainy season. The obtained results may thus be attributed
to the soil of block 1W8810win CaCo3 content which was 12%to 16.13% if
compared with soil of block 2 which ranged from 38.4% to 60.9 % in CaCo3
content
• About 27.03% ofsermn P values were below critical levels and 1.rA!
below:deficient Wvelsblock 1in rainy season About 18.18% ofserum
P values beloweritical levels and 1.8% of serum P v8lues below
Summary 101
deficient levels in block 1 in dry season, these results which obtained
in spite of normal phosphorus level in forages may be due to increase
of iron and magnesium level in forages which interfere with
phosphorus absorption and availability, 25.6% of serum P values
below critical levels and 2.5% of serum P values were below deficient
levels in block 2 in rainy season, and 23.9% of serum P values below
critical levels and 2% of serum P values below deficient levels in
block 2 in dry season. These obtained results may be due to decreased
phosphorus level in forages and soil.
• The mean serum magnesium concentrations of sheep showed
significant decreased levels (p < 0.001) in block 2 in dry season as
compared with the same block in rainy season and block 2 in rainy
and dry season. The obtained results showed also, that 2.7% of serum
Mg levels below critical values in block 1 in rainy season, 12.8% of
serum Mg levels below critical values in block 2 in rainy season, and
39.1% of serum Jl(g levels below critical values in block 2 in dry
season and there were no values at deficient levels in two blocks.
These results whi. obtained may be due to increase potassium level
in forages which ,-rJ,me with magnesium absmptim, availability in
spite of normal ~esium levels in forages
• The mean seru.mfopper concentrations of sb’ep showed significant
decreased levels c1< OJ)()1) in block 2 in dry .IIDO. t*M ••• ed wi1h
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the same block ~~ season and block 2 in niny 8Dd dry scum
The obtained re~ sbtwed also, that 51.3% of .enCDvalues wen:
below critical Ie. *3.5% below deficimt 1eYeII in block 1 in
}~ rainy season, 86.” o(the mean serum copper Oo-olbatioos values
below critical levis _ 40% of the values below ~ levels in
Summary 102
block 2 in dry season, however 23.7% of the mean serum copper
concentrations values were below critical levels in block 1 in dry
season and 7.69% of the mean serum copper concentrations values
below critical levels in block 2 in rainy season. These obtained results
may be due to decreased copper level in forages and water. In spite of
normal copper level in soil but due to increase alkalinity and Cac03
content of the soil which decrease the absorption and availability of
copper from soil to plant.
• Recorded results proved that 72.9% of serum Zn values were below
critical levels and 9.7% of serum Zn values below deficient values in
block 1 in rainy season, 68.18% of serum Zn concentrations below
critical levels and 13.5% of serum Zn values were below deficient levels
in block 1 in dry season. These obtained results may be due to
decreased zinc level in soil and water. In spite of normal zinc level in
forages, may due to decrease USFA or increase of crude fiber in forages
which induce immobilization of zinc in plant It was recorded that 92%
of serum Zn concenttations below critical levels and 20.8% of serum Zn
values below deficient levels in block 2 in rainy season, and 82.6% of
serum Zn concentrltions below critical levels and 28.5% of serum Zn
values below deficient levels in block 2 in dIy sc.tm These obtained
results may be due to decreased zinc level in soil, ~ and forages
• About 35.14% of IIIlUDl Fe concentrations were ~ critic:alvalues
and 8.4% of serum Fe values below deficialt wmc, in block 1 in rainy
season, 590.4 of sel1llllFe concentrations were 1JeIoW critical values and
90.4 of serum Fe vUues were below deficicm valu¢s in block 1 in dIy
season, 35.9% of·pm Fe concentrations below critic:al values and
3.3% of serum Feo.Ya1uesbelow deficient VIJues in block 2 in rainy
season. About 41.3% of serum Fe concentrations were below critical
values and 15.3% of serum Fe values were below deficient values in
block 2 in dry season. These obtained results in spite of normal or
increased iron levels in forages, occur due to alkalinity of the soil which
induce precipitation of iron in some tissues of plant and prevent
transferring of iron to the leaves of plant.
• The mean serum selenium concentrations of sheep showed a highly
significant decreased level in the two blocks of study area in rainy and
dry season as compared with critical level. The obtained results showed
also, thatlO0% of serum Se concentrations below critical values and
8.4% of serum Se values below deficient values in block 1 in rainy
season, 100% of serum Se concentrations below critical values and
19.8% of serum Se values below deficient values in block 1 in dry
season, 100% of serum Se concentrations below critical values and 15%
of serum Se values below deficient values in block 2 in rainy season and
100% of serum Se concentrations below critical values and 29.5% of
serum Se values below deficient values in block 2 in dry season, ’The
lower levels of seTS1 selenium concentration in the two blocks allover
the year may be OiWingto the decreased selenium concentration in
forages, soil and •. this explanation coincidaIcc with the results of
Nasr and Sydat, (211M) who stated that the sclmium CO””O.hationof
desert pasture was litiCll or marginally deficient.
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It was therefore s+* that animals in their n••••• Nhilll, loIetaties
mineral serum levels wi- .ysiological cbBDges-loBI- these liiilo.
obtained from pasture ~uate amounts.
The mean serum phosphorus, zinc, iron and selenium concentrations of
sheep showed non significant difference between the two blocks of study
area in rainy and dry season.