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Performance and digestibility of dairy calves fed milk replacer with all-milk protein or with 35% of vegetable proteins.

C. Cajarville

Events

06-22-2020

Abstract:

140
Performance and digestibility of dairy calves fed milk replacer with all-milk protein or with 35% of vegetable proteins.
M. Garc�a-Cuchma1, J. L. Repetto1, G. Ant�nez2, I. Dodera3, H. Pose3, A. Maggio1, J. Dayuto1, C. Cajarville*1. 1Departamento Producci�n Animal de Veterinaria (IPAV), Facultad de Veterinaria, UdelaR Libertad, San Jos�, Uruguay, 2Departamento de Salud en los Sistemas Pecuarios, Facultad de Veterinaria, UdelaR Paysand�, Uruguay, 3Royal Agrifirm Uruguay Group Juanic�, Canelones, Uruguay.

The effect of replacing 35% of milk protein by vegetable protein in milk replacers (MR; 24:18% CP:EE) to young calves in an intensive rearing system was evaluated. Forty-eight Holstein male calves (41 � 8 kg of BW; 3—5d old), were blocked by BW and birthdate, and randomly assigned to 4 treatments (Trt): (1) 100% milk protein (MP), (2) 65% MP + 35% micronized soybean meal (MS), (3) 65% MP + 35% wheat gluten (WG), or (4) 65% MP + 35% mixed 50:50 MS and WG (SW), offering MR at 20% of BW, 12.5% of DM, twice daily, weaning at d 60. Water and starter (21% CP, since d 21) were offered ad libitum. Intake and BW were recorded daily and weekly, respectively. Total feces were collected from each calf on d 14—18 (digestibility); blood samples were taken at d 23 and 51 (glucose and insulin). All variables were analyzed using a mixed model. Intake, BW, ADG, feed efficiency (FE), glucose, and insulin were analyzed as repeated measures over week (Wk). There was no Trt effect on MR intake (937 � 10.9 g DM/d; P = 0.40), starter intake (390 � 31.0 g DM/d; P = 0.28), ADG (738 � 30.0 g/d; P = 0.95), final BW (85.9 � 1.8 kg/d; P = 0.95), and FE (635 � 24.0 g/d; P = 0.54). Replacing 35% of MR protein by MS or WG decreased DM and CP digestibility, but this was not observed when 50:50 mix of MS-WG was used, consuming calves on SW more digestible CP than MP and MS. We found a treatment effect on insulin and insulin to glucose, but not on glucose (Table 1). It is possible that WG and SW affected insulin responsiveness, but more information is needed to confirm it. Therefore, replacement up to 35% of MR protein by a 50:50 mix of MS-WG allows to achieve similar digestion and performance than MR with 100% of MP.Table 1. Effect of replacing milk protein by vegetable protein in milk replacers

ItemTreatmentSEMP-value
MPMSWGSWTrtWkTrt � W
DM dig, %94.8a91.1b91.3b92.6ab0.850.01
CP dig, %91.0a82.8b82.7b88.3ab1.83<0.01
Dig CP intake, g/d196b193b203ab226a10.00.02
Glucose, mg/L3.02.93.13.00.140.650.010.09
Insulin, �U/mL5.8b6.7ab9.2a9.2a1.160.030.730.06
Insulin to glucose, �U/mg19.3a22.7ab29.7b29.4b3.29<0.010.950.36

Keywords: milk replacer, protein sources, digestibility.