In situ degradability of NH3-N or alkaline H2O2 treated rice straw suspended in the rumen of dairy cows. 2. Crude protein degradability of rice straw suspended in the rumen of dairy cows fed HCHO treated grains (corn or barley) based diet

Kang, H.S.; Lee, H.B.

Korean Journal of Dairy Science 16(1): 41-56


ISSN/ISBN: 0253-2980
Accession: 002636179

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In a 2 x 2 x 3 factorial design experiment with 4 replicates, CP degradability (CPD) of rice straw untreated (control) or treated with 3% ammonia gas or 4% alkaline hydrogen peroxide (AHP) was measured by the in situ nylon bag technique (0-72 h incubation) in 2 Holstein cows with rumen cannulae. Cows were fed on barley- or maize-based diets with hay, in which the cereals were untreated or treated with 0.3% formaldehyde. CP disappearance rates (CPDR) at 0, 6, 12, 24, 48 and 72 h, respectively, were: 42.3-63.5; 41.2-83.2; 42.5-72.3; 53.5-79.3; 56.0-84.9; and 58.1-83.3%. CPDR of NH3- and AHP-treated straw was 45.5 and 16.6% higher, respectively, than that of the control, while that of NH3-treated straw was 24.8% higher than that of AHP-treated straw. NH3 treatment resulted in higher CPDR values than AHP or no treatment. NH3 and AHP treatments resulted in higher CPDR values in the first 24 h incubation, whereas these treatments resulted in lower values than the control from 48 to 72 h. Up to 48 h, feeding different cereals did not significantly affect CPDR. However, over the total 72 h incubation CPDR was higher (P<0.05) by 8.2% with barley than with maize feeding. Feeding HCHO-treated barley or maize resulted in somewhat higher CPDR values in the early stages of incubation and lower values at later stages. Exponential equations were derived describing CPD for the 3 straw treatments and 2 feeding conditions.