title: Effect of feeding sweet-potato condensed distillers solubles on intake and urinary excretion of minerals in Japanese Black steers.
abstract: Four Japanese Black steers (16 months of age) were assigned to a 4 × 4 Latin square design to investigate the effect of graded levels of sweet-potato condensed distillers solubles (SCDS) in their diets on intake and urinary excretion of minerals. The four diets consisted of 0%, 10%, 20% and 30% (dry matter (DM) basis) SCDS, with SCDS replacing commercial concentrate (CC). Intake of K, Cl, S, P and Mg increased linearly with increasing SCDS content. Urinary pH increased linearly with increasing dietary SCDS content. SCDS feeding increased urinary K concentrations (linear and quadratic effects). Urinary concentrations of Cl increased linearly with increasing SCDS content. In contrast, urinary concentrations of Mg decreased with increasing SCDS content. Feeding of SCDS did not apparently affect urinary NH3,P, Na or Ca concentrations. These results suggest that high SCDS feeding is not a risk for crystallization of minerals leading to the formation of magnesium-phosphate type calculi: although SCDS contains large amounts of P and Mg, high SCDS feeding decreased the Mg concentration and did not affect the P concentration in urine. Additionally, high SCDS feeding had no apparent effects on plasma concentrations of Na, K, Cl, Ca or inorganic P.
authors.affiliation: NARO Kyushu Okinawa Agricultural Research Center, Koshi, Kumamoto, Japan.
authors.forename: Yuko
authors.initials: Y
authors.lastname: Kamiya
authors.affiliation: NARO Kyushu Okinawa Agricultural Research Center, Koshi, Kumamoto, Japan.
authors.forename: Misturu
authors.initials: M
authors.lastname: Kamiya
authors.affiliation: NARO Kyushu Okinawa Agricultural Research Center, Koshi, Kumamoto, Japan.
authors.forename: Ikuo
authors.initials: I
authors.lastname: Hattori
authors.affiliation: NARO Kyushu Okinawa Agricultural Research Center, Koshi, Kumamoto, Japan.
authors.forename: Yoshiro
authors.initials: Y
authors.lastname: Hayashi
authors.affiliation: Graduate School of Agriculture, Kyoto University, Sakyo, Kyoto, Japan.
authors.forename: Masayuki
authors.initials: M
authors.lastname: Funaba
authors.affiliation: Graduate School of Agriculture, Kyoto University, Sakyo, Kyoto, Japan.
authors.forename: Tohru
authors.initials: T
authors.lastname: Matsui
mesh_terms: D000821:Animal Feed; D000824:Animal Nutritional Physiological Phenomena / Q000502:physiology*; D000818:Animals; D002417:Cattle / Q000502:physiology* / Q000652:urine*; D006863:Hydrogen-Ion Concentration; D027723:Ipomoea batatas / Q000737:chemistry; D008297:Male; D008903:Minerals / Q000378:metabolism* / Q000652:urine*
chemical_list: D008903:Minerals
keywords: Japanese black cattle; mineral; sweet-potato condensed distillers solubles; urine