Lysozyme as an ergotropic factor in feeding calves
1999
Krzywiecki, S. | Szyszkowska, A. | Bodarski, R. (University of Agriculture, Wroclaw (Poland))
A trial was carried out in 36 calves between 14 and 70 days of age. The animals were randomly assigned to the treatments: 1/ control - no supplements, 2/ 36 mg/head/day of lysozyme isolated from hen's egg white, 3/ 16 mg/head/day of flavomycin. The highest daily weight gains were noted for lysozyme treatment, then for flavomycin and the lowest for control (564, 503 and 465 g, respectively). The crude protein utilization per 1 kg weight gain was the highest for control treatment (682 g) and the lowest for lysozyme (563 g). The energy utilization ranged similarly. On the 70th day of life, the lowest leukocytes content was observed in the control group and the highest in the lysozyme group (8760 and 9720 x 10E9/l). The serum urea levels and AspT activity significantly differed between control and lysozyme treatments (2.61 and 3.55 mmol/l of urea and 36.3 and 27.8 IU of AspT, respectively). Serum mineral levels were similar for each treatment and achieved on average: Pinorganic - 2.31, Ca - 2.33 and Mg - 1.06 mmol/l
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