Dietary supplementation with xylooligosaccharides and exogenous enzyme improves milk production, energy utilization efficiency and reduces enteric methane emissions of Jersey cows

Table 1 Ingredients and chemical composition fed to lactating Jersey cows during the study

¹Fat powder of palm oil Polyfat K200 (Britz (Xiamen) Trading Co., Ltd., Fujian province, China)
²Concentrate Dairy Jersey III (Guanghan Guoxiong Foodstuff Co., Ltd., Sichuan province, China): 27% corn, 32.4% soybean meal, 8% cottonseed meal, 15% rapeseed meal, 0.83% sodium bicarbonate, 5.5% corn gluten meal, 10.5% bypass soybean meal, 0.18% sodium chloride, 0.6% magnesium oxide
³Mineral mix contained 26.4% CP, 5.06% Ca, 10.7% Na, 6.8% K, 4.1% Mg, 0.26% S, 1.6% P, 417 mg/kg of Mn, 665 mg/kg of Zn, 229 mg/kg of Cu, 2,166 mg/kg of Fe, 24 mg/kg of Co, 14 mg/kg of I, 7.1 mg/kg of Se, 116,511 IU of vitamin A/kg, 13,100 IU of vitamin D₃, and 1,164 IU of vitamin E/kg (DM basis)
^4,5RDP (Rumen-degradable protein, g/kg DM) and RUP (Rumen-undegradable protein, g/kg DM) is calculated based on tabular value (NRC, 2001) [18]
⁶Utilizable CP (uCP, g/kg DM) is calculated using RUP (g/kg DM), CP (g/kg DM) and ME (Metabolizable energy, MJ/kg DM) content as described by Edmunds et al. [19]
⁷NFC (Non-fiber carbohydrates, g/kg DM) is calculated as follows: 100 − [CP + Ash + ether extract + NDF]
⁸NE_L (Net energy for lactation, Mcal/kg DM) is calculated using values from Feeding Standard of Dairy Cattle [20]

ISSN: 2049-1891