Performance and amino acid utilization of early lactation dairy cows fed regular or reduced-fat dried distillers grains with solubles

Journal of Dairy Science
K MjounD J Schingoethe

Abstract

The objective of this study was to evaluate lactation response and AA utilization of early lactation cows fed 2 types of dried distillers grains with solubles (DG): regular (DDGS) or reduced-fat (RFDGS). Thirty-six Holstein cows 19.7+/-2.6 d in milk at the start of the experiment were used in a randomized complete block design for 14 wk including a 2-wk covariate period. Treatments consisted of the following diets: 1) control (CON) diet containing 0% DG; 2) diet containing 22% DDGS; and 3) diet containing 20% RFDGS. Distillers grains replaced soybean meal, expeller soybean meal, and soyhulls from the CON diet. Diets were formulated to be similar in crude protein, ether extract, neutral detergent fiber, and net energy for lactation concentrations. Dry matter intake (24.7 kg/d) and milk yield (39.3 kg/d) were similar for all diets. Milk fat and lactose percentages were unaffected by diets; however, protein percentage was greater for cows fed the DG diets compared with the CON diet. Consequently, milk protein yield was also greater for the DG diets compared with CON. Milk urea nitrogen decreased for cows fed DG diets and averaged 11.8, 10.9, and 10.1 mg/dL, respectively, for CON, DDGS, and RFDGS. Feed efficiency tended to be great...Continue Reading

References

Jul 14, 1989·Clinica Chimica Acta; International Journal of Clinical Chemistry·G P GerritsB van Raay-Selten
Feb 1, 1982·Journal of Dairy Science·T B Mepham
Mar 1, 1993·Journal of Animal Science·M M Johnson, J P Peters
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Sep 9, 2006·Journal of Dairy Science·P J Kononoff, K J Hanford
Nov 20, 2009·Journal of Dairy Science·D J SchingoetheA D Garcia

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Citations

Dec 30, 2015·Animal Science Journal = Nihon Chikusan Gakkaihō·Meng ZhaoLu Ma
Sep 17, 2013·Journal of Dairy Science·H N PhuongP Schmidely
Jan 9, 2013·Journal of Dairy Science·R MartineauH Lapierre
Dec 16, 2019·Journal of Dairy Science·Alex BachMaria Vidal
Oct 8, 2018·Journal of Dairy Science·Sanjeewa D RanathungaKevin J Herrick

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