ɪn tˈuː θˈaʊzənd fˈoːɹ, ɐ jˌuːˌɛsdˌiːˈeɪ ɹᵻpˈoːɹt fˈaʊnd ðæt kˈoʊpɹˈɑːdʌkts ɐkˈaʊntɪŋ mˌeɪd ðə dˈɪfɹəns bᵻtwˌiːn ˈɛnɚdʒi ɹˈeɪʃɪˌoʊz ʌv wˈʌn.zˈiəɹoʊ sˈɪks ænd wˈʌn.sˈɪksti sˈɛvən.
In 2004, a USDA report found that co-products accounting made the difference between energy ratios of 1.06 and 1.67.