Animal feed compositions

A method of composing an animal feed comprising corn and at least one carbohydrase and has an A/X ((mass of arabinoxylans)/(mass of xylose)) corn ratio greater than 0.70, greater than 0.705, greater than 0.71, greater than 0.715, greater than 0.72, greater than 0.725, greater than 0.73, greater than 0.735, greater than 0.74, greater than 0.745, greater than 0.75, greater than 0.76, greater than 0.77, greater than 0.78, greater than 0.79, or greater than 0.80, wherein the method comprises the steps of:

• A) subjecting a sample of animal feed to:
• A1) near infrared (NIR) spectroscopy to obtain an NIR spectrum;
• A2) matching the absorption intensities at the respective wavelengths or wavenumbers in the NIR spectrum obtained in A1) with a calibration graph or equation;
• A3) a quantitative analysis of the arabinoxylans and xylose in the sample;
• and
• A4) a determination of the A/X corn ratio in the sample of animal feed;
• B) quantitative evaluation of the BWcFCR factor using Equation 2:
• Effect of Carbohydrase on BWcFCR vs NC(Body Weight corrected Feed Conversion Ratio versus NC(negative control))=6.127216113+0.1347057461*Carbohydrase dose-15.9027776*A/X corn ratio−0.189932808*Carbohydrase dose*A/X corn ratio+10.264604897*(A/X corn ratio)2, wherein
• Carbohydrase dose is mg of carbohydrase/kg animal feed, and wherein Effect of Carbohydrase on BWcFCR vs NC is the calculated FCR (feed conversion ratio) when animals are fed a diet with addition of carbohydrase compared to animals fed the same diet without addition of carbohydrase, and
• C) adding an amount of at least one carbohydrase to the animal feed in the amount determined to achieve a lower BWcFCR using Equation 2.