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Effects of milk replacer plane of nutrition and levels of starch and neutral detergent fiber in pelleted starter on calf growth performance and visceral tissue measurements.

T. T. Yohe

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06-22-2020

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Abstract:

M60
Effects of milk replacer plane of nutrition and levels of starch and neutral detergent fiber in pelleted starter on calf growth performance and visceral tissue measurements.
T. T. Yohe*1, T. S. Dennis2, J. D. Quigley2, T. M. Hill2, F. X. Suarez-Mena2, K. M. Aragona2, M. A. Steele1. 1Department of Animal Biosciences, University of Guelph Guelph, ON, Canada, 2Provimi, Cargill Animal Nutrition Brookville, OH.

The objectives of this study were to investigate how plane of milk replacer (MR) and feeding differing levels of starch and NDF in the starter alters visceral tissue and overall growth of the calf. The 4 dietary treatments (n = 12 per treatment) were: 691 g MR/day (dry matter basis; DM) with starter containing low or high starch (LL:12.0% and LH:35.6% starch, respectively) and 1,382 g MR/day (DM) with starter containing low or high starch (HL and HH, respectively). All calves were in individual pens with straw bedding until wk 5 when bedding was covered. Calves were fed MR twice daily (0700 and 1700 h) containing 24.5% CP (DM), 19.8% fat (DM), and had ad libitum access to pelleted starter and water. Calves arrived between 1 and 3 d of age and the study lasted 8 wk with calves undergoing step-down weaning during wk 7. Intakes were measured daily, BW were measured weekly, and calves were dissected in wk 8 for visceral tissue measurements. Data were analyzed using PROC MIXED in SAS 9.4 with the fixed effects of treatment, wk, and their interaction, and random effect of calf nested within treatment. There were treatment differences between average daily gain and starter DMI during wk 7 and 8 (Table 1). There were also treatment differences in full and empty rumen mass as percent BW at dissection (Table 1), but all other gastrointestinal measurements did not differ between treatments. These results indicate altering MR amount and starch content in pelleted starter affects ADG, starter intake and subsequently rumen growth and capacity in dairy calves around weaning.Table 1. Growth and intake during wk 7 (step-down weaning) and 8 and rumen measurements at dissection

ItemTreatmentSEM
LLLHHLHH
ADG, kg/d
 Wk 70.13ab0.32a−0.06ab−0.27b0.11
 Wk 80.97a0.64ab0.37ab0.24b0.13
Starter DMI, kg/d
 Wk 70.83a0.72ab0.26ab0.30b0.10
 Wk 81.80a1.61ab1.08b1.06b0.10
Rumen mass, % of BW
 Full9.92a7.69b7.83b5.54c0.50
 Empty2.15a1.74b1.62b1.40b0.09
a—cMeans within a row with different superscripts are significantly different (P < 0.05).

Keywords: dairy, calf nutrition, gut development.