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Liquid molasses interacts with buffers to affect ruminal fermentation, milk fatty acid profile, and milk fat synthesis in dairy cows fed high-concentrate diets.
J Dairy Sci. 2020 May; 103(5):4327-4339.JD

Abstract

We aimed to evaluate the effects of feeding sugarcane liquid molasses (LM) with or without a commercial buffer mix (BFM) on ruminal fermentation parameters, milk fatty acid (FA) profile, and milk yield and composition in dairy cows fed high-concentrate diets (35:65 forage-to-concentrate ratio). Eight multiparous Holstein cows (4 ruminally cannulated) averaging 165 ± 12 d in milk at the beginning of the study were randomly assigned to a replicated 4 × 4 Latin square design with a 2 × 2 factorial arrangement of treatments. Each period lasted 21 d with 14 d for diet adaptation and 7 d for data and sample collection. Cows were fed the following diets: (1) no LM or BFM supplementation (CTRL), (2) LM without BFM supplementation (MOL), (3) BFM without LM supplementation (BUF), and (4) LM plus BFM supplementation (COMBO). These 4 isonitrogenous and isoenergetic diets were formulated by replacing (dry matter basis) 5% ground corn with LM, whereas BFM replaced wheat bran at 0.8% of the diet. Significant LM × BFM interactions were observed for the duration of ruminal pH below 5.8, molar proportion of propionate, acetate-to-propionate ratio, milk proportions of trans-10 18:1 and total trans FA, and concentration and yield of milk fat. Feeding MOL and BUF alone were effective on reducing the time that ruminal pH remained below 5.8 compared with the CTRL treatment, and the COMBO diet decreased it further. A similar pattern was observed for the ruminal molar proportion of propionate. The milk proportions of trans-10 18:1 and total trans FA dropped significantly with BFM or LM supplementation versus cows fed CTRL, and the COMBO diet decreased these variables further. Note, however, that these changes elicited by the COMBO diet were not in the same magnitude as those caused by MOL or BUF fed alone. The ruminal molar proportion of acetate increased with the BUF diet and that of butyrate increased in cows fed MOL, but mean ruminal pH was not affected by treatments. Diets with LM resulted in increased concentrations of short- and medium-chain FA in milk fat. The yield of 3.5% fat-corrected milk increased significantly in cows fed MOL or BUF due to the improved concentration of milk fat. A trend and a significant increase for energy-corrected milk were observed with feeding MOL or BUF, respectively. Overall, inclusion of LM and BFM appears to reduce milk trans-10 18:1 FA and total trans FA by modulating ruminal pH and volatile FA profile in cows fed high-concentrate diets.

Authors+Show Affiliations

Department of Animal Science, Faculty of Agriculture, Ferdowsi University of Mashhad, PO Box 91775-1163, Mashhad, Iran; Innovation Center, Ferdowsi University of Mashhad, PO Box 9177948974, Mashhad, Iran.Department of Animal Science, Faculty of Agriculture, Ferdowsi University of Mashhad, PO Box 91775-1163, Mashhad, Iran. Electronic address: valizadeh@um.ac.ir.Institute of Animal Science, Physiology and Hygiene Unit, University of Bonn, 53115 Bonn, Germany.Department of Agriculture, Nutrition, and Food Systems, University of New Hampshire, Durham 03824.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

32147270

Citation

Razzaghi, A, et al. "Liquid Molasses Interacts With Buffers to Affect Ruminal Fermentation, Milk Fatty Acid Profile, and Milk Fat Synthesis in Dairy Cows Fed High-concentrate Diets." Journal of Dairy Science, vol. 103, no. 5, 2020, pp. 4327-4339.
Razzaghi A, Valizadeh R, Ghaffari MH, et al. Liquid molasses interacts with buffers to affect ruminal fermentation, milk fatty acid profile, and milk fat synthesis in dairy cows fed high-concentrate diets. J Dairy Sci. 2020;103(5):4327-4339.
Razzaghi, A., Valizadeh, R., Ghaffari, M. H., & Brito, A. F. (2020). Liquid molasses interacts with buffers to affect ruminal fermentation, milk fatty acid profile, and milk fat synthesis in dairy cows fed high-concentrate diets. Journal of Dairy Science, 103(5), 4327-4339. https://doi.org/10.3168/jds.2019-17169
Razzaghi A, et al. Liquid Molasses Interacts With Buffers to Affect Ruminal Fermentation, Milk Fatty Acid Profile, and Milk Fat Synthesis in Dairy Cows Fed High-concentrate Diets. J Dairy Sci. 2020;103(5):4327-4339. PubMed PMID: 32147270.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Liquid molasses interacts with buffers to affect ruminal fermentation, milk fatty acid profile, and milk fat synthesis in dairy cows fed high-concentrate diets. AU - Razzaghi,A, AU - Valizadeh,R, AU - Ghaffari,M H, AU - Brito,A F, Y1 - 2020/03/05/ PY - 2019/06/26/received PY - 2019/12/09/accepted PY - 2020/3/10/pubmed PY - 2020/9/17/medline PY - 2020/3/10/entrez KW - milk fat depression KW - ruminal pH KW - soluble carbohydrate KW - trans fatty acid SP - 4327 EP - 4339 JF - Journal of dairy science JO - J Dairy Sci VL - 103 IS - 5 N2 - We aimed to evaluate the effects of feeding sugarcane liquid molasses (LM) with or without a commercial buffer mix (BFM) on ruminal fermentation parameters, milk fatty acid (FA) profile, and milk yield and composition in dairy cows fed high-concentrate diets (35:65 forage-to-concentrate ratio). Eight multiparous Holstein cows (4 ruminally cannulated) averaging 165 ± 12 d in milk at the beginning of the study were randomly assigned to a replicated 4 × 4 Latin square design with a 2 × 2 factorial arrangement of treatments. Each period lasted 21 d with 14 d for diet adaptation and 7 d for data and sample collection. Cows were fed the following diets: (1) no LM or BFM supplementation (CTRL), (2) LM without BFM supplementation (MOL), (3) BFM without LM supplementation (BUF), and (4) LM plus BFM supplementation (COMBO). These 4 isonitrogenous and isoenergetic diets were formulated by replacing (dry matter basis) 5% ground corn with LM, whereas BFM replaced wheat bran at 0.8% of the diet. Significant LM × BFM interactions were observed for the duration of ruminal pH below 5.8, molar proportion of propionate, acetate-to-propionate ratio, milk proportions of trans-10 18:1 and total trans FA, and concentration and yield of milk fat. Feeding MOL and BUF alone were effective on reducing the time that ruminal pH remained below 5.8 compared with the CTRL treatment, and the COMBO diet decreased it further. A similar pattern was observed for the ruminal molar proportion of propionate. The milk proportions of trans-10 18:1 and total trans FA dropped significantly with BFM or LM supplementation versus cows fed CTRL, and the COMBO diet decreased these variables further. Note, however, that these changes elicited by the COMBO diet were not in the same magnitude as those caused by MOL or BUF fed alone. The ruminal molar proportion of acetate increased with the BUF diet and that of butyrate increased in cows fed MOL, but mean ruminal pH was not affected by treatments. Diets with LM resulted in increased concentrations of short- and medium-chain FA in milk fat. The yield of 3.5% fat-corrected milk increased significantly in cows fed MOL or BUF due to the improved concentration of milk fat. A trend and a significant increase for energy-corrected milk were observed with feeding MOL or BUF, respectively. Overall, inclusion of LM and BFM appears to reduce milk trans-10 18:1 FA and total trans FA by modulating ruminal pH and volatile FA profile in cows fed high-concentrate diets. SN - 1525-3198 UR - https://www.unboundmedicine.com/medline/citation/32147270/Liquid_molasses_interacts_with_buffers_to_affect_ruminal_fermentation_milk_fatty_acid_profile_and_milk_fat_synthesis_in_dairy_cows_fed_high_concentrate_diets_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0022-0302(20)30170-3 DB - PRIME DP - Unbound Medicine ER -