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Milk production responses to altering the dietary ratio of palmitic and oleic acids varies with production level in dairy cows.
J Dairy Sci. 2020 Dec; 103(12):11472-11482.JD

Abstract

We evaluated the effects of altering the dietary ratio of palmitic (C16:0; PA) and oleic (cis-9 C18:1; OA) acids on production responses of cows with a wide range of milk production (32 to 65 kg/d) in a crossover design experiment with a preliminary period. Thirty-two multiparous Holstein cows (144 ± 54 d in milk) were assigned randomly to a treatment sequence. Treatments were diets supplemented with fatty acid (FA) blends (1.5% of diet dry matter) that provided 80% C16:0 + 10% cis-9 C18:1 (PA) and 60% C16:0 + 30% cis-9 C18:1 (PA+OA). The corn silage and alfalfa-based diets contained 20.0% forage neutral detergent fiber (NDF), 28.5% starch, and 17.1% crude protein. Treatment periods were 21 d with the final 5 d used for data and sample collection. Treatment did not affect dry matter intake (DMI), milk yield, energy-corrected milk (ECM), body weight, or body weight change. The PA+OA diet increased total, 16-carbon, and 18-carbon FA digestibility compared with the PA diet. Compared with PA+OA, PA increased fat yield (1.97 vs. 1.91 kg/d) and protein yield (1.61 vs. 1.55 kg/d). The PA diet also increased the yield of de novo (448 vs. 428 g/d) and mixed (749 vs. 669 g/d) milk FA and decreased the yield of preformed FA (605 vs. 627 g/d) compared with PA+OA. Interactions were detected between treatment and preliminary milk yield for DMI, total FA intake, 16-carbon FA intake, ECM, 3.5% fat-corrected milk (linear interaction), and a tendency for milk yield (linear interaction); lower-producing cows (<45 kg/d) had increased DMI and ECM on the PA diet, whereas higher-producing cows (>55 kg/d) had increased DMI and ECM on the PA+OA diet. A linear interaction was detected between treatment and preliminary milk yield for mixed milk FA yield (linear interaction) and a tendency for de novo milk FA yield (linear interaction). Our results demonstrate that feeding a fat supplement containing more cis-9 C18:1 replacing C16:0 increased production responses (DMI, milk yield, and ECM) in higher-producing cows, but decreased production responses in lower-producing cows.

Authors+Show Affiliations

Department of Animal Science, Michigan State University, East Lansing 48824.Department of Animal Science, Michigan State University, East Lansing 48824.Department of Animal Science, Michigan State University, East Lansing 48824. Electronic address: allock@msu.edu.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

33069410

Citation

Western, Marin M., et al. "Milk Production Responses to Altering the Dietary Ratio of Palmitic and Oleic Acids Varies With Production Level in Dairy Cows." Journal of Dairy Science, vol. 103, no. 12, 2020, pp. 11472-11482.
Western MM, de Souza J, Lock AL. Milk production responses to altering the dietary ratio of palmitic and oleic acids varies with production level in dairy cows. J Dairy Sci. 2020;103(12):11472-11482.
Western, M. M., de Souza, J., & Lock, A. L. (2020). Milk production responses to altering the dietary ratio of palmitic and oleic acids varies with production level in dairy cows. Journal of Dairy Science, 103(12), 11472-11482. https://doi.org/10.3168/jds.2020-18936
Western MM, de Souza J, Lock AL. Milk Production Responses to Altering the Dietary Ratio of Palmitic and Oleic Acids Varies With Production Level in Dairy Cows. J Dairy Sci. 2020;103(12):11472-11482. PubMed PMID: 33069410.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Milk production responses to altering the dietary ratio of palmitic and oleic acids varies with production level in dairy cows. AU - Western,Marin M, AU - de Souza,Jonas, AU - Lock,Adam L, Y1 - 2020/10/15/ PY - 2020/05/21/received PY - 2020/08/05/accepted PY - 2020/10/19/pubmed PY - 2021/1/23/medline PY - 2020/10/18/entrez KW - C16:0 KW - cis-9 C18:1 KW - milk production KW - palmitic acid KW - production response SP - 11472 EP - 11482 JF - Journal of dairy science JO - J Dairy Sci VL - 103 IS - 12 N2 - We evaluated the effects of altering the dietary ratio of palmitic (C16:0; PA) and oleic (cis-9 C18:1; OA) acids on production responses of cows with a wide range of milk production (32 to 65 kg/d) in a crossover design experiment with a preliminary period. Thirty-two multiparous Holstein cows (144 ± 54 d in milk) were assigned randomly to a treatment sequence. Treatments were diets supplemented with fatty acid (FA) blends (1.5% of diet dry matter) that provided 80% C16:0 + 10% cis-9 C18:1 (PA) and 60% C16:0 + 30% cis-9 C18:1 (PA+OA). The corn silage and alfalfa-based diets contained 20.0% forage neutral detergent fiber (NDF), 28.5% starch, and 17.1% crude protein. Treatment periods were 21 d with the final 5 d used for data and sample collection. Treatment did not affect dry matter intake (DMI), milk yield, energy-corrected milk (ECM), body weight, or body weight change. The PA+OA diet increased total, 16-carbon, and 18-carbon FA digestibility compared with the PA diet. Compared with PA+OA, PA increased fat yield (1.97 vs. 1.91 kg/d) and protein yield (1.61 vs. 1.55 kg/d). The PA diet also increased the yield of de novo (448 vs. 428 g/d) and mixed (749 vs. 669 g/d) milk FA and decreased the yield of preformed FA (605 vs. 627 g/d) compared with PA+OA. Interactions were detected between treatment and preliminary milk yield for DMI, total FA intake, 16-carbon FA intake, ECM, 3.5% fat-corrected milk (linear interaction), and a tendency for milk yield (linear interaction); lower-producing cows (<45 kg/d) had increased DMI and ECM on the PA diet, whereas higher-producing cows (>55 kg/d) had increased DMI and ECM on the PA+OA diet. A linear interaction was detected between treatment and preliminary milk yield for mixed milk FA yield (linear interaction) and a tendency for de novo milk FA yield (linear interaction). Our results demonstrate that feeding a fat supplement containing more cis-9 C18:1 replacing C16:0 increased production responses (DMI, milk yield, and ECM) in higher-producing cows, but decreased production responses in lower-producing cows. SN - 1525-3198 UR - https://www.unboundmedicine.com/medline/citation/33069410/Milk_production_responses_to_altering_the_dietary_ratio_of_palmitic_and_oleic_acids_varies_with_production_level_in_dairy_cows_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0022-0302(20)30836-5 DB - PRIME DP - Unbound Medicine ER -