Effects of varying dietary calcium and phosphorus on growth and on composition of empty bodies and isolated bones of male kids.
Two experiments, each following a two-factorial design (2 x 2), were carried out using 12 and 13 male kids initially weighing about 10 kg. Concentrations per kg dietary dry matter were 10 vs. 4 g Ca and 4.5 vs. 2.0 g P in experiment 1 as compared to 10 vs. 17 g Ca and 4.2 vs. 2.5 g P in experiment 2, respectively. In experiment 1, low Ca intake significantly reduced empty body concentrations of ash, Ca and P with no negative effect on performance traits, whereas low P intake negatively affected feed intake, growth rate and feed conversion ratio, and reduced empty body concentrations of ash, Ca, P and Mg. Low intake of either one or both of these elements increased lipid concentrations of femora, pelvis and vertebrae. In these three bones, the respective ratios Ca/P, Ca/Mg and P/Mg were decreased by low Ca intake and, to greater extents, increased by low P intake. Low intake of both elements caused less pronounced changes than low intake of P alone. In experiment 2, lowering dietary P concentration to 2.5 g/kg dry matter significantly reduced growth rates without affecting empty body concentrations of ash, Ca, P or Mg. Almost doubling Ca intake significantly increased body concentrations of ash, Ca and P at both levels of P intake without influencing growth rates.
Pfeffer
E
E
Institut für Tierernährung der Rheinischen Friedrich-Wilhelms-Universität Bonn, Germany.
Rodehutscord
M
M
Breves
G
G
D000818:Animals; D001823:Body Composition / Q000187:drug effects* / Q000502:physiology; D015992:Body Mass Index; D001842:Bone and Bones / Q000737:chemistry* / Q000378:metabolism; D002118:Calcium / Q000032:analysis / Q000097:blood / Q000378:metabolism; D002136:Calcium, Dietary / Q000008:administration & dosage* / Q000494:pharmacology; D004032:Diet / Q000662:veterinary; D006041:Goats / Q000254:growth & development* / Q000378:metabolism / Q000502:physiology; D008274:Magnesium / Q000032:analysis / Q000097:blood / Q000378:metabolism; D008297:Male; D010758:Phosphorus / Q000032:analysis / Q000097:blood / Q000378:metabolism; D016226:Phosphorus, Dietary / Q000008:administration & dosage* / Q000494:pharmacology; D011897:Random Allocation
D002136:Calcium, Dietary; D016226:Phosphorus, Dietary; D010758:Phosphorus; D008274:Magnesium; D002118:Calcium