Influence of dietary magnesium level on metabolic and growth-performance responses of feedlot cattle to laidlomycin propionate.

Zinn, R. A.; Shen, Yixin; Adam, Christelle; Tamayo, M S; Rosalez, J

doi:10.2527/1996.7471462x

Cited by 13 publications

(7 citation statements)

References 32 publications

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“…This difference may have occurred due to diarrhea in the animals receiving supplementation, leading to increased gastric emptying pre-slaughter. These data are contradictory to other experiments (Zinn et al, 1996;Apple et al, 2005), who found no change in yield.…”

Section: Resultscontrasting

confidence: 99%

Performance, carcass and meat quality of ewes supplemented with magnesium oxide

et al. 2014

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-The objective of this study was to evaluate the performance, the carcass and meat characteristics of ewes supplemented with magnesium oxide. Eighteen 6-year-old Santa Ines ewes were used in a completely randomized experimental design, where three levels of supplementation (0.0, 0.1 and 0.2% magnesium oxide in the concentrate) were tested, with six replicates. Final weight, weight gain, feed intake and feed conversion were not affected by levels of magnesium supplementation. Hot and cold carcass weights showed linear increasing and quadratic responses, respectively, according to supplementation with magnesium. Carcass measurements such as length, depth, and measures of arm and leg were not affected by supplementation. Depth and width of the longissimus muscle and rib-eye area were not affected; however, marbling and ether extract increased linearly with supplementation. Water loss and color were not affected. Lipid oxidation and shear force were not affected by supplementation, while the myofibrillar fragmentation index showed a quadratic regression. There was a linear decrease in pH with magnesium supplementation. Supplementation with magnesium can improve carcass and meat pH, but can act negatively by increasing the amount of marbling and ether extract of meat.

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Section: Resultscontrasting

confidence: 99%

Performance, carcass and meat quality of ewes supplemented with magnesium oxide

et al. 2014

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“…This amounts to a reduction in dietary ME of 0. Consistent with previous studies (Bauer et al, 1995;Zinn et al, 1996;Ramirez et al, 1998), laidlomycin supplementation did not affect (P>0.20) carcass characteristics. Likewise, variation i n supplement concentration did not affect (P > 0.20) carcass characteristics (Table 2).…”

Section: Resultssupporting

confidence: 80%

Effect of Variation in Supplement Inclusion Rate and Laidlomycin Propionate on Growth Performance of Feedlot Cattle

Montaño

Loya-Olguin

Plascencia

et al. 2010

Journal of Applied Animal Research

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“…Typically, concentrations of total VFA are not affected, but molar proportions of propionate are increased and acetate and butyrate are decreased compared with unsupplemented controls (Raun et al, 1976;Chalupa et al, 1980). Laidlomycin propionate has been reported to affect ruminal VFA concentrations in a similar fashion, except for butyrate, which is not altered (Galyean et al, 1992;Zinn et al, 1996;Campbell et al, 1997). Ionophore effects on ruminal VFA concentrations in the growth and ruminal metabolism experiments agree with these observations.…”

Section: Ruminal Characteristicssupporting

confidence: 65%

“…Galyean et al (1992) noted LP supplementation increased the ruminal NH 3 N concentration of steers offered a concentrate diet. In addition, Zinn et al (1996) reported LP increased duodenal flow of NH 3 N for steers, suggesting an increased ruminal NH 3 N concentration. Therefore, we conducted two experiments to evaluate the effect of LP on steer growth and ruminal N metabolism.…”

Section: Introductionmentioning

confidence: 94%

Efficacy of laidlomycin propionate in low-protein diets fed to growing beef steers: effects on steer performance and ruminal nitrogen metabolism.

Bohnert

Harmon²,

Dawson³

et al. 2000

Journal of Animal Science

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We conducted two experiments to evaluate the effect of the ionophore laidlomycin propionate (LP) on steer performance and ruminal N metabolism. Experiment 1 was a 91-d growth study evaluating the growth and ruminal characteristics of steer calves consuming supplemental LP. Steers (n = 96; 255 +/- 3 kg; four steers/pen; six pens/treatment) were used in a randomized complete block design with a 2 x 2 factorial arrangement of treatments consisting of two levels of dietary CP (formulated to be 10.5 and 12.5% of DM) with and without LP (11 mg/kg diet DM). Ruminal fluid was collected via stomach tube on d 91 from one steer randomly selected from each pen. No CP x LP interactions were observed with performance data (P > .64). Final weight and total gain were greater (P < .07) for 12.5% CP and LP compared with 10.5% CP and control steers, respectively. Also, DMI was increased (P = .08) with 12.5% CP but not with LP supplementation (P = .36). In addition, ADG and gain:feed ratio were greater (P < .03) for both 12.5% CP and supplemental LP. Ruminal NH3 N concentration was greater (P < .09) with 12.5% CP and LP. Total VFA concentration and molar proportion of acetate were not affected by treatment (P > .11). However, propionate concentration was increased (P < .09) with 12.5% CP and LP, and acetate:propionate was lower (P = .02) with LP supplementation. In Exp. 2, six steers were used in a replicated 3 x 3 Latin square design to compare ruminal fermentation and protein degradation in steers without ionophore feeding or adapted to LP or monensin. In vitro deamination of amino acids by adapted ruminal microbes was also assessed. Ionophore supplementation decreased (P = .07) ruminal NH3 N concentration compared with control steers, and LP increased (P = .02) ruminal NH3 N compared with monensin. Molar proportion of acetate was decreased (P = .02) and propionate increased (P = .01) with ionophore treatment. Consequently, ionophore supplementation depressed the acetate:propionate ratio (P = .01). In situ degradation rate of soybean meal (SBM) CP was greater (P = .09) with ionophore treatment, but estimates of SBM undegradable intake protein were not altered by treatment (P > .25). Microbial specific activity of net NH3 N release and alpha-amino N degradation were decreased (P < .04) with ionophores. Based on this study, LP and monensin did not affect the extent of ruminal degradation of SBM CP but decreased amino acid deamination.

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Influence of dietary magnesium level on metabolic and growth-performance responses of feedlot cattle to laidlomycin propionate.

Cited by 13 publications

References 32 publications

Performance, carcass and meat quality of ewes supplemented with magnesium oxide

Performance, carcass and meat quality of ewes supplemented with magnesium oxide

Effect of Variation in Supplement Inclusion Rate and Laidlomycin Propionate on Growth Performance of Feedlot Cattle

Efficacy of laidlomycin propionate in low-protein diets fed to growing beef steers: effects on steer performance and ruminal nitrogen metabolism.

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