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Factors Affecting the Particle Size Distribution of Grazed Forage due to Ingestive Mastication by Steers and Wethers¹

Washington State University, Pullman 99164-6320

Abstract

Two grazing trials with four crossbred steers (Trial 1, 326 kg; Trial 2, 267 kg) and one trial with four crossbred wethers (31 kg) were conducted to determine the variability between animals in and to identify chemical composition correlated with the particle size distributions of esophageal masticate. Steers in Trial 1 and wethers in Trial 3 differed (P < .05) in log₁₀ standard deviation of particle size distributions. The proportion of medium particles (495 to 991 µm) increased linearly (P < .05), and the proportion of large particles (> 991 µm) decreased linearly (P < .1) across periods in Trial 1. Log₁₀ mean particle size in Trials 2 and 3 and log₁₀ standard deviation in Trials 1 and 2 were positively correlated (P < .1) with in vitro organic matter disappearance of esophageal masticate. Log₁₀ standard deviation was negatively correlated (P < .1) with neutral detergent fiber content of esophageal masticate in Trials 1 and 3, acid detergent fiber content (P < .1) in Trial 1 and acid detergent lignin content (P < .1) in Trials 1 and 2. The results are interpreted to indicate that composition or maturity of forage consumed altered ingestive mastication. However, individual animals also differed in ingestive mastication across periods, which resulted in an animal x period interaction in one trial.

¹ Scientific paper no. 7741, College of Agric. and Home Econ. Res. Center, Washington State Univ. Research conducted under Project No. 0713. Technical assistance of J. W. Finley, C. T. Gaskins, L. Motjope and S. M. Parish is gratefully acknowledged.

² Dept. of Anim. Sci.

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