Effects of apple pomace proportion levels on the fermentation quality of total mixed ration silage and its digestibility, preference and ruminal fermentation in beef cows

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Abstract
Four Japanese black beef cows were used in a 4 × 4 Latin square to evaluate the fermentation quality, digestibility, ruminal fermentation and preference of total mixed ration (TMR) silages prepared with differing proportions of apple pomace (AP). Experimental treatments were the control (no AP added, CAP), 5% (low, LAP), 10% (medium, MAP) and 20% (high, HAP) of TMR dry matter (DM) as AP. All TMR silages were well preserved. Ethanol was produced in silages containing AP and the amount increased with the proportion of AP (P < 0.05). Nutrient digestibility with LAP, MAP and HAP treatment was lower than that with CAP treatment (P < 0.05). The ruminal molar proportion of acetic acid increased (P < 0.05), but the ruminal ammonia‐N concentration decreased (P < 0.05) as the proportion of AP increased. The preference of the animals was highest for HAP, followed by MAP, CAP and LAP. This study demonstrates that decrease in nutrient digestibility might be related to the ethanol produced naturally from AP. Therefore, the proportion of AP in TMR silages should be less than 5% of dietary DM.
Funding Information
  • Scientific Research Foundation for Overseas Scholars of Educational Commission of Heilongjiang Province of China (1253HQ009)
  • Initial Foundation of Scientific Research of Heilongjiang Bayi Agricultural University (XYB2013-11)
  • Projects of National Science and Technology Support Program of China (2013BAD12B01)
  • Application Technology Research and Development Projects of the Science and Technology Department of Heilongjiang Province of China (WB13B11101)
  • National Natural Science Foundation of China (31201819)

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