TY  - JOUR
T1  - Effects of Inclusion of Different Levels of Iron in Lamb Diets on Apparent Absorption and Retention of Phosphorus
AU - , Ignacio Mejia Haro AU - , R. Dennis Brink AU - , Jose Mejia Haro 
JO  - Journal of Animal and Veterinary Advances
VL  - 8
IS  - 1
SP  - 19
EP  - 22
PY  - 2009
DA  - 2001/08/19
SN  - 1680-5593
DO  - javaa.2009.19.22
UR  - https://makhillpublications.co/view-article.php?doi=javaa.2009.19.22
KW  - Iron
KW  -lambs
KW  -phosphorus
KW  -sulfate
KW  -diets
KW  -absorption
AB  - An experiment was conducted to evaluate effects of high-iron (Fe) diets on apparent absorption and retention of P in lambs. Eighteen lambs approximately 7-mo old and averaging 33 kg were assigned randomly to one of three treatments, differing only in the concentration of Fe in diet; T<SUB>1</SUB> (100 ppm), T<SUB>2</SUB> (350 ppm) and T<SUB>3</SUB> (600 ppm). Diet of T<SUB>1</SUB> consisted of chopped switchgrass (<I>Panicum virgatum </I>L.) hay and diets of T<SUB>2</SUB> and T<SUB>3</SUB>, the same feed plus supplementation of ferrous sulfate to make diets containing 350 and 600 ppm of Fe, respectively. Lambs were fed individually in the experimental period for 6 weeks, previous adaptation to the diet, placed in metabolism crates and fitted with fecal collection bags. The last 7 day of the experimental period, total fecal and urinary collections were made and representative samples were taken. Feed and fecal samples were processed for DM, P and Ca and urine for P and <I>in vivo</I> dry matter digestibility, apparent P and Ca absorption and net P and Ca body retention were calculated. Data were processed statistically by analyses of variance and orthogonal contrasts. Coefficients of apparent absorption of P and <I>in vivo</I> dry matter digestibility were not different (p>0.05) among treatments. Likewise, urinary P and net body retention of P and Ca were not different (p>0.05). Daily intakes of Ca and P were considered deficient for growing lambs and produced negative Ca balances and low P retention in lambs. Different than expected, diets containing 350 and 600 ppm of Fe had no negative effects on apparent absorption and retention of P and Ca in growing lambs consuming a low Ca and P diet.
ER  -