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Replacing soybean meal with canola meal reduced enteric methane production and improved milk production in dairy cows.

F. Hassanat

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06-24-2020

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Abstract:

W72
Replacing soybean meal with canola meal reduced enteric methane production and improved milk production in dairy cows.
C. Benchaar1, F. Hassanat*1, G. Gilson2, K. A. Beauchemin3. 1Agriculture and Agri-Food Canada, Sherbrooke Research and Development Centre Sherbrooke, QC, Canada, 2Universit� degli Studi di Milano, Dipartimento di Scienze Agrarie e Ambiental Milano, Italy, 3Agriculture and Agri-Food Canada, Lethbridge Research and Development Centre Lethbridge, AB, Canada.

The objective of this study was to determine the effect of replacing soybean meal with canola meal (CM) as protein source in dairy cow diets on intake, milk production, rumen fermentation and enteric CH4 emissions. Sixteen lactating cows (DIM = 116 � 23; milk yield = 47.5 � 4.9 kg) were used in a replicated 4 � 4 Latin square (35-d period; 14-d adaptation). Cows were fed (ad libitum) a TMR composed (on DM basis) of 52% forages (25% grass silage, 22% corn silage; 5% timothy hay) and 48% concentrates. In the concentrate portion, CM was included at 8, 16 and 24% (DM basis) to replace soybean meal and soybean hulls. Diets were formulated to be isonitrogenous at 16.3% CP. Intake, digestibility and milk performance were determined over 6 consecutive days, CH4 was measured using respiration chambers (5 consecutive days), while rumen fermentation parameters were measured over 2 consecutive days. Linear and quadratic contrasts (Proc MIXED; SAS) were used to determine effects of dietary CM levels on variable responses. Significance was declared at P ≤ 0.05. Intake (DM) increased linearly with increasing CM inclusion in the diet (26.7, 27.8, 28.0 and 28.6 kg/d for 0 to 24% CM, respectively), while DM and CP digestibility decreased linearly. Canola meal inclusion in the diet increased milk production linearly (44.0, 45.0, 45.6 and 46.2 kg ECM/d for 0 to 24% CM, respectively), but did not affect milk production efficiency. Ruminal pH, total VFA, acetate, an propionate molar proportions averaged 6.15, 141 mM, 61% and 23% and were not affected by CM inclusion in the diet. A linear decline in CH4 emissions (489, 475, 463 and 461 g/d; 5.65, 5.28, 5.05, 4.90% gross energy intake for 0 to 24% CM, respectively) was observed with increasing CM inclusion in the diet. When expressed on milk yield basis, CH4 emission declined linearly with increasing CM inclusion in the diet (11.5, 11.0, 10.6, 10.3 g CH4/kg ECM). Results from this study show that replacing soybean meal with canola meal as a protein source in dairy cow diets increases milk production and reduces enteric CH4 emissions.

Keywords: canola meal, enteric methane, milk production.