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Preference, feeding behavior, and in vitro fermentation characteristics of pelleted feeds containing different binders in growing primiparous Holstein cows.

H. T. Hong

Abstract:

M29
Preference, feeding behavior, and in vitro fermentation characteristics of pelleted feeds containing different binders in growing primiparous Holstein cows.
H. T. Hong*1, H. C. Hung1, K. R. Kerner1, A. L. Peterson1, S. Burkhardt2, A. H. Laarman1, P. Rezamand1. 1University of Idaho Moscow, ID, 2Sustainable Fiber Technologies Renton, WA.

Objectives of this study were to test preference, feeding behavior, and rumen fermentation characteristics of a new feed binder, a thermo-chemically treated lignin product. Five pelleted feeds were prepared including a negative control containing neither molasses nor the new product (NCTL), a positive control containing Ameri-Bond 2X at 2.1% dry matter basis (DM, PCTL). Three pelleted feeds that contained the new binder were low (1.6% DM, LOW), medium (3.2% DM, MED), high (4.8% DM, HIGH). Ten Holstein heifers were placed in individual stalls and given one feed, for one hour, to determine the acceptance, intake, and feeding behavior regarding each feed. To determine the preference, cows were given 2 feeds (a reference diet, NCTL; and another feed) in 2 separate buckets with rotations for one hour. Intake was measured and preference was calculated using the following: Preference % = (Test diet) / (Test diet + Reference diet) � 100%. Pelleted feeds were placed in the rumen fluid in vitro for 0, 4, 8, 12, 18, 24, 48 and 72 h. Degradation of dry matter (DM), organic matter (OM), NDF, and ADF were analyzed. Data were analyzed using the PROC GLIMMIX (SAS v. 9.4) with significance declared at P ≤ 0.05. Acceptance of LOW was the highest (P = 0.001). Cows spent more time eating on LOW than other feeds (P = 0.001) and less time wandering on NCTL and LOW (P = 0.045), but no difference observed in rumination and drinking time. Intake at each approach was greater for MED which did not differ from LOW or HIGH (P = 0.03). The number of times that cows approached and ate feed for LOW was the highest but it did not differ from NCTL or HIGH (P = 0.025). Cows preferred LOW over other feeds (P = 0.001). The degree of DM degradation for PCTL, LOW, and MED were greater than that of NCTL and HIGH (P < 0.001). Overtime (0—72 h), OM degradation of NCTL was the smallest (P < 0.001). There were no difference for DM, OM, and NDF degradation at 24, 48, or 72 h among feeds. Degradation of ADF at 24 h or 72 h did not differ among feeds but at 48 h showed difference between NCTL vs. other feeds with either binders (P = 0.006).

Keywords: feeding behavior, feed binder.

Biography: Hsin-Tai Hong is a visiting scholar from Taiwan and now do ruminant nutrition research in University of Idaho.