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Effects of feeding whole milk, waste milk, and pasteurized waste milk on ruminal parameters and gut weight on dairy bull calves.

J. P. Campolina



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Effects of feeding whole milk, waste milk, and pasteurized waste milk on ruminal parameters and gut weight on dairy bull calves.
H. C. Diniz Neto1, S. F. Vieira1, J. P. Campolina*1, S. G. Coelho1, M. M. Campos2. 1Department of Animal Science, School of Veterinary Medicine, Federal University of Minas Gerais Belo Horizonte, MG, Brazil, 2Brazilian Agricultural Research Corporation (Empresa Brasileira de Pesquisa Agropecu�ria, EMBRAPA), National Center for Research on Dairy Cattle Juiz de Fora, MG, Brazil.

The aim of this research was to evaluate the impact of feeding whole milk (WH-M), waste milk (WA-M) and pasteurized waste milk (PW-M) on the concentration of volatile fatty acids (VFA) and gut weight. Forty-five crossbred bull calves (Hostein-Gir) were used with mean birth weight of 37.67 � 5.85 kg. Immediately after birth, calves were separated from their mothers, had their navel immersed on iodine (10%), and received 10% of their BW in colostrum (min 25 BRIX). In the first 3 d of life, they received transitional milk. On the fourth day, they were distributed in 3 treatments: WH-M (n = 15); WA-M (n = 15) and PW-M (n = 15). Six liters of milk per treatment were offered, twice a day, as well as water and starter were provided at will until the age of 57 d. The waste milk came from cows treated with antimicrobials (clinical mastitis, retained placenta and foot disease). Fast pasteurization 72 to 74 C was used for 16 s. Ruminal fluid was collected at 14, 28, 42 and 56 d of age, for the evaluation of VFA: acetate (ACE), butyrate (BUT) and propionate (PRO). At 60 d of age, all animals were euthanized and had the rumen-reticulum (RR), omasum (OMA), abomasum (ABO), small intestine (SI) and large (LI) separated and weighed empty. Organs were evaluated in proportion to empty BW (EBW). The R software was used to perform the statistical analyzes, with P < 0.05 being considered significant. The WH-M treatment showed lower concentrations of ACE and PRO (30.49 and 20.84 mmol/L) compared with PW-M (39.75 and 28.12 mmol / L), but similar to the WA-M treatment (33.08 and 22.2 mmol/L), respectively. There were no differences between the WH-M, WA-M and PW-M treatments for BUT concentration (4.98, 5.51 and 6.25 mmol/L) and ACE:PRO (1.78, 1.76 and 1.59 �mol/mL), respectively. WH-M treatment had lower rumen weight (1.06% PV), compared with WA-M (1.26% PV) and similar weight to PW-M (1.24% PV). There were no differences between treatments in the weight of OMA, ABO, SI and LI. The use of milk with antimicrobial residue affects the ACE and PRO concentrations of and the rumen weight.

Keywords: volatile fatty acid, euthanasia.