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Effect of high-amylase corn silage on lactational performance and enteric methane emission in dairy cows.

S. F. C. Welchez




Effect of high-amylase corn silage on lactational performance and enteric methane emission in dairy cows.
S. F. C. Welchez*, H. Stefenoni, A. Melgar, C. F. A. Lage, S. E. R�is�nen, D. Wasson, M. E. Fetter, A. N. Hristov. The Pennsylvania State University University Park, PA.

This study investigated the effect of high-amylase corn silage on lactation performance, enteric methane (CH4) emission, and rumen fermentation of lactating dairy cows. Following a 2-wk covariate period, 48 cows averaging (�SD): 121 � 30 d in milk (DIM), 43 � 9 kg/d milk yield (MY), and 620 � 61 kg BW were blocked based on DIM, MY, and enteric CH4 emission and randomly assigned to 1 of 2 treatments in an 8-wk randomized complete block design experiment: (1) control corn silage from an isoline parental corn without α-amylase trait (CON) and (2) corn silage containing a bacterial transgene expressing high levels of α-amylase in the endosperm of the grain (EFC; EnogenFeed, Syngenta Seeds LLC, Downers Grove, IL). Silages were included at 40% of the total mixed ration dry matter (DM) EFC and CON silage were 43.3 and 41.8% DM and had (%, DM): neutral-detergent fiber (NDF), 36.7 vs. 37.5 and starch, 36.1 vs. 33.1, respectively. The overall diets contained (%, DM basis): crude protein, 16.5 vs. 16.7; NDF, 33.6 vs. 33.9; and starch, 25.2 vs. 24.0 for EFC and CON, respectively. Enteric CH4 emission was measured using the GreenFeed system (C-Lock Inc., Rapid City, SD). Rumen samples were collected using the ororuminal sampling technique on experimental wk 6. Data were analyzed using PROC MIXED of SAS with block and block � treatment as random effects. DMI (25.3 kg/d; SEM = 0.34, P = 0.55) was similar between treatments. Compared with CON, MY (38.8 vs. 40.8 kg/d; SEM = 0.50), feed efficiency (1.53 vs. 1.63 kg/kg; SEM = 0.027), ECM feed efficiency (1.51 vs 1.57 kg/kg; SEM = 0.022), milk true protein (1.20 vs 1.25 kg/d; SEM = 0.033), and lactose yields (1.89 vs 2.00 kg/d; SEM = 0.016) were increased (P ≤ 0.05) by EFC. Daily CH4 emission (416 g/d; SEM = 8.2) was not affected (P = 0.32) by treatment, but CH4 emission intensity was decreased (P = 0.007; 11.1 vs 10.3 g/kg milk; SEM = 0.22;) by EFC. Molar proportion of butyrate was higher (P = 0.04) in CON vs. EFC (14.6 vs. 11.3 mol %; SEM = 1.06). EFC inclusion at 40% of dietary DM increased milk yield and feed efficiency and decreased CH4 emission intensity in dairy cows.

Keywords: dairy cow, corn silage, enteric methane.

Biography: My name is Sergio Cueva Welchez, and I received my BS as an agronomist in Zamorano Panamerican Agricultural University in Honduras. Currently, I am in my second year as a MSc student at The Pennsylvania State University. Advised by Alexander Hristov, my research focuses on factors that affect starch and corn silage utilization by dairy cows.