📘 ❞ A comparison of supplemental forms of phosphorus L. J. FISHER ❝ كتاب ــ كاتب غير معروف اصدار 2000

عن كتاب A comparison of supplemental forms of phosphorus L. J. FISHER:
A comparison of supplemental forms of phosphorus
A COMPARISON OF SUPPLEMENTAL FORMS OF PHOSPHORUS

L. J. FISHER

Research Station, Agriculture Canada, Agassil, British C olumbia VOM IA0.
Contribution no. 245 , received 19 Oct. 1977 , accepted I Mar. 1978 .
FrsHen, L. J. 1978. A comparison of supplemental forms of phosphorus. Can.
J. Anim. Sci. 5E: 313-317.
Four yearling Holsteins were utilized in a 4 x 4 latin square designed experiment to
assess the availability of phosphorus in four chemical forms: dicalcium phosphate;
monocalcium phosphate; monoammonium phosphate and monosodium phosphate.
The chemical form of supplement had no apparent effect on plasma levels of
phosphorus, calcium or magnesium or on the fecal excretion of phosphorus. Dry
matter intake and digestibility of dry matter were not influenced by chemical form of
supplement but digestibility of the acid detergent fiber fraction was higher, 59.2 vs.
56.5, for monosodium phosphate compared with monoammonium phosphate. The
molar proportion of propionate in the rumen fluid was significantly greater (P <0.05)
when monosodium phosphate was fed compared with the feeding of either
monocalcium phosphate or monoammonium phosphate. Under the conditions of this
experiment it was concluded that there were no differences in availability of
phosphorus among the four chemical forms studied.
Quatre Holstein d'un an ont servi h une exp6rience en carr6 latin 4 x 4 visant d
6valuer I'assimilabilit6 du phosphore sous quatre formes chimiques: phosphate
bicalcique, phosphate monocalcique, phosphate d'ammonium et phosphate de
sodium. La forme chimique des suppl6ments ne semble pas avoir eu d'effet visible
sur les teneurs plasmatiques en phosphore, en calcium, en magn6sium ou sur
1'6xcr6tion f6cale de phosphore. Elle n'a pas non plus influ6 sur I'ingestion ni sur la
digestibilit6 de la matibre sEche bien que |a digestibilit6 de la fibre (fraction au
d6tergent acide) ait 6t6 sup6rieur (59.2) avec le phosphate de sodium qu'avec le
phosphate d'ammonium (56.5). La proportion molaire de propionate dans le liquide
du rumen 6tait significativement plus importante (P<0.05) avec I'emploi du
phosphate de sodium qu'avec celui du phosphate d'ammonium ou du phosphate
monocalcique. Dans le cadre de I'exp6rience, il ne semble donc pas y avoir de
diff6renceJd'assimilabilit6 entre les quatres formes de phosphore 6tudi6es.