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Milk production and composition from cows fed high oil or conventional corn at two forage concentrations.
J Dairy Sci. 2003 Jul; 86(7):2428-37.JD

Abstract

Twelve multiparous Holstein cows (63 +/- 24 d in milk) were used in a replicated 4 x 4 Latin square with 28-d periods to evaluate conventional and high oil corn grains when fed at two different forage-to-concentrate ratios. Dietary treatments consisted of conventional or high oil corn supplementing a diet with a 25:25:50 mixture of corn silage: alfalfa: concentrate mix, or a high forage diet with a 30:30:40 mixture of corn silage: alfalfa: concentrate mix. Dry matter intake (28.1, 28.7, 26.9, and 26.2 kg/d for normal diets with conventional and high oil corn, and high forage diets with conventional and high oil corn, respectively) and milk yields (36.8, 37.2, 35.5, and 35.2 kg/d) were similar for conventional and high oil corn diets and were lower with the high forage diet, regardless of corn source. Milk fat concentrations were greater when cows were fed diets containing 60% forage (4.03 vs. 3.88%, for the 60 and 50% forages, respectively), but milk protein concentrations were not affected by forage content. Corn source did not affect milk fat or protein concentrations. Long-chain fatty acid concentrations, unsaturated fatty acid concentrations, and total 18:1 fatty acid concentrations were greater when cows were fed high oil corn but were unaffected by forage content of the diet. Concentrations of transvaccenic acid (0.58, 0.81, 0.62, and 0.69 g/100 g of fatty acids) and cis-9, trans-11 conjugated linoleic acid (0.28, 0.39, 0.32, and 0.33 g/100 g of fatty acids) were greater when cows were fed high oil compared with conventional corn when fed 50% forage but were similar for both corn sources at 60% forage. Total n-3 fatty acids were not affected by corn source or forage content. High forage diets decreased milk production and increased milk fat concentration. Feeding high oil corn increased concentrations of long-chain, unsaturated, transvaccenic, and conjugated linoleic fatty acids in milk; however, production of transvaccenic and conjugated linoleic acids were attenuated by high forage diet.

Authors+Show Affiliations

Dairy Science Department, South Dakota State University, Brookings 57007-0647, USA.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

12906061

Citation

Whitlock, L A., et al. "Milk Production and Composition From Cows Fed High Oil or Conventional Corn at Two Forage Concentrations." Journal of Dairy Science, vol. 86, no. 7, 2003, pp. 2428-37.
Whitlock LA, Schingoethe DJ, Hippen AR, et al. Milk production and composition from cows fed high oil or conventional corn at two forage concentrations. J Dairy Sci. 2003;86(7):2428-37.
Whitlock, L. A., Schingoethe, D. J., Hippen, A. R., Kalscheur, K. F., & AbuGhazaleh, A. A. (2003). Milk production and composition from cows fed high oil or conventional corn at two forage concentrations. Journal of Dairy Science, 86(7), 2428-37.
Whitlock LA, et al. Milk Production and Composition From Cows Fed High Oil or Conventional Corn at Two Forage Concentrations. J Dairy Sci. 2003;86(7):2428-37. PubMed PMID: 12906061.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Milk production and composition from cows fed high oil or conventional corn at two forage concentrations. AU - Whitlock,L A, AU - Schingoethe,D J, AU - Hippen,A R, AU - Kalscheur,K F, AU - AbuGhazaleh,A A, PY - 2003/8/9/pubmed PY - 2003/9/27/medline PY - 2003/8/9/entrez SP - 2428 EP - 37 JF - Journal of dairy science JO - J Dairy Sci VL - 86 IS - 7 N2 - Twelve multiparous Holstein cows (63 +/- 24 d in milk) were used in a replicated 4 x 4 Latin square with 28-d periods to evaluate conventional and high oil corn grains when fed at two different forage-to-concentrate ratios. Dietary treatments consisted of conventional or high oil corn supplementing a diet with a 25:25:50 mixture of corn silage: alfalfa: concentrate mix, or a high forage diet with a 30:30:40 mixture of corn silage: alfalfa: concentrate mix. Dry matter intake (28.1, 28.7, 26.9, and 26.2 kg/d for normal diets with conventional and high oil corn, and high forage diets with conventional and high oil corn, respectively) and milk yields (36.8, 37.2, 35.5, and 35.2 kg/d) were similar for conventional and high oil corn diets and were lower with the high forage diet, regardless of corn source. Milk fat concentrations were greater when cows were fed diets containing 60% forage (4.03 vs. 3.88%, for the 60 and 50% forages, respectively), but milk protein concentrations were not affected by forage content. Corn source did not affect milk fat or protein concentrations. Long-chain fatty acid concentrations, unsaturated fatty acid concentrations, and total 18:1 fatty acid concentrations were greater when cows were fed high oil corn but were unaffected by forage content of the diet. Concentrations of transvaccenic acid (0.58, 0.81, 0.62, and 0.69 g/100 g of fatty acids) and cis-9, trans-11 conjugated linoleic acid (0.28, 0.39, 0.32, and 0.33 g/100 g of fatty acids) were greater when cows were fed high oil compared with conventional corn when fed 50% forage but were similar for both corn sources at 60% forage. Total n-3 fatty acids were not affected by corn source or forage content. High forage diets decreased milk production and increased milk fat concentration. Feeding high oil corn increased concentrations of long-chain, unsaturated, transvaccenic, and conjugated linoleic fatty acids in milk; however, production of transvaccenic and conjugated linoleic acids were attenuated by high forage diet. SN - 0022-0302 UR - https://www.unboundmedicine.com/medline/citation/12906061/Milk_production_and_composition_from_cows_fed_high_oil_or_conventional_corn_at_two_forage_concentrations_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0022-0302(03)73837-5 DB - PRIME DP - Unbound Medicine ER -