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The effect of a fish oil based-product and canola oil on blood lactate, rectal temperature, health, daily gain, and starter intake on Holstein dairy calves.

P. Melendez

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06-23-2020

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Abstract:

T16
The effect of a fish oil based-product and canola oil on blood lactate, rectal temperature, health, daily gain, and starter intake on Holstein dairy calves.
P. Melendez*1, C. Roeschmann2, A. Baudo3, S. Tao1, J. Bernard1, P. Pinedo4, F. Farcey5. 1University of Georgia Tifton, GA, 2University of Chile Santiago, Chile, 3Abraham Baldwin Agricultural College Tifton, GA, 4Colorado State University Fort Collins, CO, 5National University La Pampa Gral. Pico, Argentina.

Morbidity rate is still high in modern dairy calf operations. Nutritional strategies based on n-3 FA to positively modulate the immune system have barely been studied in dairy calves. The aim was to assess the effect of a based-fish oil product versus canola oil (control) on blood lactate concentration, rectal temperature (RT), nasal (NS) and fecal score (FS), BW and starter intake (SI) in Holstein calves. The study was conducted at the Dairy Research Center UGA, Tifton Campus. Between September and November 2019, 30 calves were randomly assigned by sex at birth to 2 groups. Calves were fed a milk replacer (26% CP, 20% fat, 12.5% solution), 2 L in a.m. and 2 L in p.m. during wk 1. Then, 3 L in a.m. and 3 L in p.m. between wk 2 and 7, and 3 L in a.m. during wk 8. Starter and water were offered from d 3 until weaning. A group received 30 mL of canola oil (CAN) and the other received 60 g of a fish oil-based product providing 30 g of fish oil (FO), daily, at the a.m. feeding until weaning. Products were added to the milk solution in the feeding bucket. At 7, 14, 21, 28, 35, 49 and 56 d of age a blood sample, RT, BW, and SI were taken. FS and NS were obtained daily. Lactate was measured in blood through a handheld device (Lactate Meter, Nova Biomedical, Waltham, MA). Lactate, RT BW, and SI were analyzed by ANOVA for repeated measures (PROC MIXED). FS and NS were analyzed by PROC NPAR1WAY, SAS. There was a tendency for lactate to be lower in the FO than the CAN at d 7 (P = 0.09) and 28 (P = 0.06). Neither BW nor RT, and SI were different between groups (P > 0.05). There was a tendency for the overall FS (P = 0.1) and NS (P = 0.053) to be higher in the CAN than the FO throughout the trial (Table 1). We concluded that FO improved slightly health parameters of dairy calves.Table 1.

DayLactate (mmol/L)RT (�C)BW (kg)SI (g)
CANFOCANFOCANFOCANFO
136.335.5
71.761.3138.838.738.838.79.9213.8
141.491.2738.838.838.439.749.433.7
211.100.9838.738.940.641.368.170.5
281.551.0638.938.843.445.4123.9170.2
351.061.3138.738.848.849.9381.8397.9
490.720.8139.239.356.758.51,016.41,072.2
561.101.0638.738.662.260.02,010.91,898.1

Keywords: calf, omega-3 FA, lactate.