Adsa Logo White Adsa Title White

Impact of phase feeding Holstein calves in winter on growth and feed efficiency.

T. S. Dennis

Events

06-22-2020

Join T. S. Dennis on this page for a live text chat!
6:00 PM - 8:00 PM GMT

Abstract:

M63
Impact of phase feeding Holstein calves in winter on growth and feed efficiency.
T. S. Dennis*, F. X. Suarez-Mena, K. M. Aragona, T. M. Hill, J. D. Quigley. Nurture Research Center, Provimi, Cargill Animal Nutrition Brookville, OH.

Calves require additional energy during the first 3 wk of life when ambient temperatures are low. Increasing total solids offered or increasing energy density in liquid feed can increase energy intake. The objective of this study was to evaluate feeding more milk replacer (MR) compared with feeding higher fat MR to achieve similar energy intakes in the first 3 wk of life during winter. Male Holstein calves (n = 98; 42.4 ± 4.7 kg initial BW; 2 to 3 d of age) were received in 2 blocks. Treatments were assigned to calves by BW at arrival and serum total protein. Treatments were: 681 g/d of 24% CP, 17% fat (as-fed basis) MR for 42 d (CON); 816 g/d of 24% CP, 17% fat MR for 21 d, then reduced to 681 g/d until 42 d (HIMR); or 681 g/d of 24% CP, 34% fat for 21 d, then switched to 681 g/d of 24% CP, 17% MR until 42 d (HIFAT). All calves were weaned by reducing MR by half from d 43 to 49. Calves were individually-housed in a barn with natural ventilation, straw bedding, and no added heat. Calf BW, hip width, hip height, and BCS were measured weekly. Temperatures were below 10°C for > 14 of the 21 d treatment period in both blocks. Data were analyzed as a completely randomized design with repeated measures, block as a random effect, and calf as experimental unit. Overall ADG, starter intake, and frame growth were similar among treatments. Calves fed HIMR and HIFAT had greater feed efficiency overall compared with CON. A treatment × time effect for ADG (P = 0.02), starter intake (P < 0.01), feed efficiency (P = 0.05), and medical treatments (P = 0.09) was observed. Calves fed HIMR gained more BW and were more efficient compared with CON and HIFAT in wk 1, and HIMR and HIFAT gained more BW and were more efficient than CON in wk 2. Starter intake was greater for CON vs. HIMR and HIFAT at wk 6 and 7. Calves fed HIMR and HIFAT had a greater number of medical treatments in wk 1 (6.1 and 5.4 vs. 1.4) compared with CON and HIMR had a greater number of treatments in wk 2 (3.4 vs. 0.9) compared with CON. Feeding more MR vs. higher fat MR appears to be a more efficient method to increase growth rates early in winter, though overall performance was similar at 8 wk of age.

Keywords: milk replacer, fat, feeding rate.