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Milk production and nitrogen efficiency in Holstein cows supplemented with a natural additive, ValKalor, in a low protein content diet.

J. Ferguson

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06-22-2020

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Abstract:

M117
Milk production and nitrogen efficiency in Holstein cows supplemented with a natural additive, ValKalor, in a low protein content diet.
J. Ferguson*1, L. Baker1, J. Bender1, J.-P. Ricaud2, M. Aoun2, D. Pitta1. 1University of Pennsylvania, School of Veterinary Medicine Kennett Square, PA, 2Idena Inc Sautron, Pays de la Loire, France.

Forty Holstein cows [mean milk production (SD) and DIM, 40.8 kg/d (8.3) and 96.7 d (25.3), respectively] were randomly assigned to 4 treatment pens (3 primiparous and 7 multiparous/pen). The experiment was a switchback design, 2 dietary treatments offered to 2 pens for two 3-wk periods, separated by a 2-wk washout period. The basal TMR consisted of corn and sorghum silages, ground corn, and a 36% protein mineral mix. The TMR included 13 ppm monensin. Treatment was 200 g (20 g/cow/d) of ValKalor (Hibiscus sabdariffa, blend of essential oils, Idena) in 4.5 kg of ground corn top dressed on the TMR. The control diet was 4.5 kg of ground corn top dressed on the TMR. Daily feed samples and weigh backs were collected by pen and composited by period for chemical analysis. Pen TMR and weigh back amounts and DMs were measured daily. Daily milk per cow was recorded at am and pm milkings and summed for volume over the experimental periods. Individual cow milk samples were collected in the third week (Tuesday p.m. and Wednesday a.m.) of each experimental period, composited and analyzed for milk fat, protein, urea nitrogen, and somatic cell content. Nutrient content (% DM) of the control and treatment TMR, respectively was (%, SD): CP, 14.8 (0.7), 14.1 (1.3); NDF, 32.4 (2.0), 33.5 (3.0); starch, 27.8 (1.7), 27.0 (2.3); fat, 3.9 (0.3), 3.6 (0.4).Table 1. Production results

ItemControlSEMValKalorSEMP <
TreatLactT x L
Milk, kg/d35.020.8734.580.870.00370.00010.0591
ECM, kg/d37.641.9239.221.920.20620.00010.7024
Milk Pro, %3.270.053.320.050.25490.17080.4811
Milk Fat, %4.180.154.240.150.75170.79670.8190
Prot. yield, g/d1,097.823.61,148.423.60.08690.00010.3962
Fat yield, g/d1,402.448.21,465.448.20.35870.00040.9087
SCC, x100040.60.231.60.20.04470.91850.5359
MUN, mg/dL11.40.311.30.20.71320.33140.5727
DMI, kg/cow25.40.524.90.50.0445NANA
N intake, g/d598.925.7561.960.40.0355NANA
Milk N, g/d194.71.7195.06.10.5508NANA
N efficiency0.330.010.350.030.0240NANA
ECM/DMI1.540.051.580.080.2879NANA

Keywords: production, milk protein, N efficiency.