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Effects of milk replacer feeding rate and fat content on Jersey calves to 4 months of age.

F. X. Suarez-Mena

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06-22-2020

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Abstract:

M74
Effects of milk replacer feeding rate and fat content on Jersey calves to 4 months of age.
F. X. Suarez-Mena*, T. S. Dennis, K. M. Aragona, T. M. Hill, J. D. Quigley, R. L. Schlotterbeck. Nurture Research Center, Provimi Brookville, OH.

This study evaluated effects of milk replacer (MR) feeding rate and fat concentration in MR on total-tract digestion (TTD) and performance in Jersey calves. Jersey heifer calves (n = 100 [2 blocks of 50]; initially 30 � 3.0 kg BW; 4 to 11 d of age) were randomly assigned to 4 treatments in a 2 � 2 factorial arrangement of MR feeding rate (454 g for 42 d, then 227 g for 7 d [Low]; or 454 g for 7 d, 681 g for 35 d, and 341 for 7 d [High]) and 18 or 25% fat in MR (DM basis). Milk replacers (25% CP) were reconstituted to 14% solids and fed in 2 equal feedings for 42 d and a.m. only for 7 d. Textured calf starter (CS; 21% CP, 40% starch DM) and water were offered for ad libitum consumption. From d 57—112, CS was mixed with 5% chopped grass hay. Up to d 56, calves were housed individually and from d 57—112 in groups (4—5 calves/pen). Calves were weighed weekly from 0 to 56 d and on d 84 and 112. Frame measurements were done every 2 wk from 0 to 56 d and on d 84 and 112. Estimates of TTD were measured in 5 calves/treatment (Block 1) at wk 3 using acid insoluble ash as a marker. Data were analyzed as a completely randomized design with repeated measures, block as a random effect, and calf as experimental unit up to 56 d and pen thereafter. From 0 to 56 d, CS intake was greater (P < 0.05) for Low vs. High (0.76 vs. 0.64 kg/d) and 18 vs. 25% fat (0.76 vs. 0.64 kg/d); ADG was greater for High vs Low (0.56 vs. 0.52 kg/d); and hip width change was greater for 18 vs. 25% fat (4.8 vs. 4.4 cm). Estimates of OM TTD were greater (P < 0.05) for High vs. Low (93 vs. 87%) but NDF TTD was greater for Low vs. High (37 vs. 30%) and for 18 vs. 25% fat (39 vs. 29%). From 57 to 112 d, hip height change was greater for Low vs. High (10.0 vs. 8.8 cm) and hip width change was greater for 18 vs. 25% fat (4.6 vs. 4.2 cm). In this study, feeding Jersey calves more MR improved pre-weaning ADG but had a negative impact on starter intake and likely rumen development as fiber TTD was reduced at 3 wk and frame growth was reduced from 8 to 16 wk. No benefits were observed for feeding more fat in MR as starter intake, fiber digestibility, and frame growth were reduced.

Keywords: feeding rate, digestibility, Jersey calf.

Biography: feeding rate, digestibility, Jersey calf