Potassium and Lasalocid Effects on Performance and Digestion in Lambs

Abstract

Two trials were conducted to evaluate effects of dietary potassium (K) concentration and lasalocid (L) in lamb finishing diets. Treatments were arranged in a 2 X 2 factorial and consisted of a 65% concentrate diet with 1.1% K (C), .9% K + 21.3 mg L/kg (CL), 2.1% K (P) and 2.5% K + 20 mg L/kg (PL). In trial 1, 64 fine-wool lambs (initial wt 35.3 kg) were randomly assigned to the four treatments (two pens of four wethers and four ewes/treatment) for a 56-d feeding trial. Average daily gain was not affected by K, but was increased (P less than .10) by L (.23 vs .26 kg/d). Lasalocid tended (P less than .20) to improve feed:gain ratio (5.6 vs 6.3). A K X L interaction (P less than .06) was noted for feed intake, with values of 1.37, 1.45, 1.49 and 1.51 kg X head-1 X d-1 for the C, CL, P and PL groups, respectively. In trial 2, 16 wether lambs (four/treatment fed at 2% of body weight) were used in a site and extent of digestion and nitrogen (N) balance trial, using the same four diets as in trial 1. Site of digestion was estimated from abomasal samples taken at slaughter, with indigestible acid detergent fiber as a marker. Total tract organic matter digestibility was increased (P less than .05) with added K (80.1 vs 76.4%) and L (80 vs 76.4%). Ruminal starch digestibility was not affected by added K, but was decreased (P less than .10) by added L (71.8 vs 88.2%).(ABSTRACT TRUNCATED AT 250 WORDS)

Efeitos da enramicina e monensina sódica sobre a digestão de nutrientes em bovinos alimentados com dietas contendo alto nível de concentrados

“…Essa mudança na digestão do amido provavelmente resultaria em maior quantidade de carbono do amido sendo absorvida como glicose, em vez de AGV, o que tornaria mais eficiente o uso energético pelo animal hospedeiro. Funk et al (1986) utilizaram lasalocida em ovinos e verificaram resultados semelhantes. Huntington (1997) concluiu que esta maior quantidade de amido no intestino delgado não traz vantagens energéticas para os ruminantes, primeiramente pela capacidade limitada do intestino delgado em digerir amido e também pela utilização visceral de glicose resultante da digestão amilolítica no intestino delgado.…”

Combined effect of salinomycin and feeding on whole body glucose kinetics in sheep fed a high-concentrate diet

“…In addition, an increase in absorbed glucose may also contribute to the increased glucose entry rate with SL. Some previous results suggest that ionophore supplementation may increase glucose absorption: a decrease in the percentage of starch digested in the rumen and an increase in the amount of starch digested in the lower-digestive tract in steer supplemented with monensin [42] and in lamb supplemented with lasalocid [43], and a tendency for a decrease in glucose uptake of portal-drained viscera (this causes an increase in glucose entry into the portal vein) with monensin in steers fed alfalfa hay [44] or a high-grain diet [45].…”

Effects of Flavomycin on Ruminal Fermentation, <em>In Situ</em> Degradability and <em>In Vivo</em> Digestibility in Bovine Fed Sugarcane Diets

“…Flavomycin mainly inhibits two groups of bacterias, ones from the group High Activity of Ammonia Production (HAAP) and also Gram-negative fusobacteria, where both groups have high specific activity of desamination (Edwards et al, 2005). Chen and Russell (1991); Dennis et al (1981); Duffield et al (1998); Funk et al (1986); McGuffey et al (2001); McKain et al (2000); Phipps et al (2000); Ovchinnikov (1979) and Schelling (1984) are trying to characterize the antimicrobial mode of action and clarify how these agents act in digestive efficiency improvement and, consequently, animal productivity.…”