| Autor: |
Henry, D, Ciriaco, F, Araujo, R, Fontes, P, Oosthuizen, N, Garcia-Ascolani, M, Sanford, C, Schulmeister, T, Martin, R, Dubeux, J, Rostoll-Cangiano, L, Lamb, G, DiLorenzo, N |
| Zdroj: |
Journal of Animal Science; December 2018, Vol. 96 Issue: 1, Number 1 Supplement 3 p398-399, 2p |
| Abstrakt: |
A randomized complete block design was used to determine the effects of bismuth subsalicylate (BSS) and encapsulated calcium-ammonium nitrate (eCAN) on CH4emission and apparent total-tract digestibility of beef cattle consuming bahiagrass hay (Paspalum notatum) ad libitum and sugar cane molasses (1.07 kg/d; DM basis). Twenty-five crossbred steers (335 ± 46 kg of BW) were randomly assigned to treatments arranged as a 2 × 2 + 1 factorial. Factors were the inclusion of eCAN (0 or 350 mg/kg BW), BSS (0 or 58.4 mg/kg BW), and a negative control (NCTRL; bahiagrass hay and molasses only). Excluding NCTRL, all treatments were made isonitrogenous with urea. Steers were re-randomized for a second period (n = 10/treatment total). Methane was determined using the SF6tracer technique. Apparent total-tract digestibility was determined using indigestible NDF as an internal marker. Orthogonal contrasts were used to evaluate the effects of NPN (NCTRL vs. others), source of NPN (urea vs. eCAN), BSS, and source of NPN×BSS. No interactions were observed for any variables, nor were there any effects on nutrient intake, excluding CP. There was no effect (P> 0.41) of NPN on total-tract digestibility of DM, OM, NDF, or ADF. Digestibility of DM, OM, NDF, and ADF were reduced (P< 0.03) for steers consuming eCAN compared with urea. There was no effect (P> 0.15) of BSS on digestibility of nutrients. No changes were observed for CH4emissions, in terms of OM intake or OM digestibility; however, CH4(g/kg BW0.75) was decreased (P= 0.05) by 11% with the addition of eCAN compared with urea. While eCAN may be a viable resource for mitigating enteric CH4production of forage-fed cattle, the negative effects on digestibility should be considered. Furthermore, BSS, at the amount provided, appears to have no negative effects on digestibility of nutrients in forage-fed cattle. |
| Databáze: |
Supplemental Index |
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