High Levels of Monensin to Mid Lactating Dairy Cows: Nutrient Digestibility, Ruminal Fermentation and Microbial Protein Synthesis

Subject Areas : Camel

جی.ر. گاندرا ¹ (Department of Animal Science, School of Agrarian Science, Federal University of Grande Dourados, Rodovia Dourados-Itahum, Dourados, Brazil)
جی.ای. فریتاس جونیور ² (Department of Nutrition and Animal Production, School of Veterinary Medicine and Animal Sciences, University of São Paulo, Pirassununga, Brazil)
م. ماتورانا فیلهو ³ (Department of Nutrition and Animal Production, School of Veterinary Medicine and Animal Sciences, University of São Paulo, Pirassununga, Brazil)
ر.و. بارلتا ⁴ (Department of Nutrition and Animal Production, School of Veterinary Medicine and Animal Sciences, University of São Paulo, Pirassununga, Brazil)
ل.ن. رنو ⁵ (Department of Animal Science, Federal University of Viçosa, Viçosa, Brazil)
سی.اس. تاکیا ⁶ (Department of Animal Science, School of Agrarian Science, Federal University of Grande Dourados, Rodovia Dourados-Itahum, Dourados, Brazil)
ف.پ. رنو ⁷ (Department of Animal Science, School of Agrarian Science, Federal University of Grande Dourados, Rodovia Dourados-Itahum, Dourados, Brazil)

Received: 2015-08-07 Accepted : 2015-11-15 Published : 2016-06-01

Keywords: Antimicrobial, additive, indigestible acid detergent fiber, ionophore, purine de-rivatives,

Abstract :

The aim of this study was to evaluate the nutrient digestibility, ruminal fermentation and microbial protein synthesis of mid-lactating cows fed high dietary levels of monensin. Twelve Holstein cows were distributed into four 3 × 3 latin squares and assigned to the following treatments: control (CON), monensin 24 (M24, addition of 24 mg monensin/kg diet DM) and monensin 48 (M48, addition of 48 mg monensin/kg diet DM). Dietary levels of monensin linearly decreased dry matter intake without altering the nutrient total apparent digestibility. Monensin linearly increased ruminal fluid pH and acetate concentration. Monensin quadratically affected ruminal total short chain fatty acids, propionate concentration, acetate and propionate production and acetate to propionate ratio. Furthermore, monensin linearly increased the efficiency of microbial protein synthesis.

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