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Relationship of undigested and physically effective neutral detergent fiber with dry matter intake and energy-corrected milk yield of Holstein cows.

M. D. Miller

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06-24-2020

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Abstract:

W47
Relationship of undigested and physically effective neutral detergent fiber with dry matter intake and energy-corrected milk yield of Holstein cows.
M. D. Miller*, W. A. Smith, R. J. Grant. William H. Miner Agricultural Research Institute Chazy, NY.

Forage quality measures should be related to animal performance. Undigested neutral detergent fiber after 240 h of in vitro fermentation (uNDF240) is a laboratory measure of indigestible NDF that is related to rumen fill and NDF turnover. Physically effective uNDF240 (peuNDF240) is the product of uNDF240 and physical effectiveness factor (% of particles ≥ 1.18-mm screen with dry sieving). Our objective was to build a database to develop relationships between uNDF240 and peuNDF240 with dry matter intake (DMI), energy-corrected milk yield (ECM), and rumen pH in Holstein cows. We used Pearson correlations and multiple linear regression (MLR) on 16 treatment means from 5 experiments conducted at the William H. Miner Agricultural Research Institute in Chazy, New York. Diets contained corn silage, hay crop silage, chopped wheat straw, and 2 diets contained substantial beet pulp. Cows in the studies averaged (mean � SD) 104 � 15 d in milk, 27.7 � 1.1 kg/d DMI, and 48.7 � 2.2 kg/d ECM yield. Data were analyzed using Reg and Corr procedures of SAS (version 9.4). The uNDF240 had a strong negative (P < 0.05) relationship with DMI and ECM (r = −0.57 and −0.76, respectively) and a strong positive (P < 0.05) relationship with mean rumen pH (r = 0.82). Physically effective uNDF240 had a strong negative (P < 0.05) relationship with DMI and ECM (r = −0.78 and −0.88, respectively), and a strong positive (P < 0.05) relationship with mean rumen pH (r = 0.88). The MLR analysis to predict DMI and ECM accounted for 32.7 and 58.3% of the variance using uNDF240. The MLR analysis to predict DMI and ECM accounted for 60.4% and 77.8% of the variance using peuNDF240. Based on these results, uNDF240 and peuNDF240 are highly related to DMI and ECM in corn silage-based diets and could be used to create useful prediction models. These relationships of uNDF240 and peuNDF240 with DMI and ECM need to be investigated for legume-based diets.

Keywords: undigested fiber, dry matter intake, energy-corrected milk.