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Rapporto di ricerca (3.6 MB) - Agenzia Regionale Centrale Acquisti ...

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Groff, E. B. e Wu Z. J. 2005. Milk Production and Nitrogen Excretion of Dairy Cows Fed Different<br />

Amounts of Protein and Varying Proportions of Alfalfa and Corn Silage. J. Dairy Sci.<br />

88:3619–3632.<br />

Jonker, J. S., R. A. Kohn, e R. A. Erdman. 1998. Using milk urea nitrogen to pre<strong>di</strong>ct nitrogen<br />

excretion and utilization efficiency in lactating dairy cows. J. Dairy Sci. 81:2681–2692.<br />

Kauffman, A. J., e N. R. St-Pierre. 2001. The relationship of milk urea nitrogen to urine nitrogen<br />

excretion in Holstein and Jersey cows. J. Dairy Sci. 84:2284–2294.<br />

Nennich T. D., Harrison J. H., VanWieringen L. M., Meyer D., Heinrichs A. J., Weiss W. P., St-<br />

Pierre N. R., Kincaid R. L., Davidson D. L., Block E. 2005. Pre<strong>di</strong>ction of Manure and<br />

Nutrient Excretion from Dairy Cattle. J. Dairy Sci. 88:3721-3733.<br />

Nennich, T. D., J. H. Harrison, L. M. VanWieringen, N. R. St-Pierre,R. L. Kincaid, M. A. Wattiaux,<br />

D. L. Davidson, and E. Block.2006. Pre<strong>di</strong>ction and evaluation of urine and urinary nitrogen<br />

and mineral excretion from dairy cattle. J. Dairy Sci. 89:353–364.<br />

Van Horn, H. H., Wilkie, A. C., Powers, W. J., Nordstedt, R. A. 1994. Components of Dairy<br />

Manure Management Systems. J. Dairy Sci. 77: 2008-2030<br />

Zhai S.W., Liu J.X., Ma Y. (2005): Relation between milk urea content and nitrogen excretion from<br />

lactating cows. Acta Agric. Scand., Sect. A-Animal Sci., 55, 113–115.<br />

Tab. 1 - Quantità <strong>di</strong> urine prodotte e <strong>di</strong> azoto urinario escreto stimati in funzione del tenore <strong>di</strong> azoto<br />

ureico nel latte, a seconda della base foraggera e del tenore proteico della <strong>di</strong>eta.<br />

Base foraggera Livello <strong>di</strong> PG N ureico latte Urine 1 N urinario 2 N urinario 3<br />

nella <strong>di</strong>eta (mg/dL) (kg/d) (g/d) (g/d)<br />

Mais Basso 11 ± 0,3 a 23 ± 0,2 a 137 ± 4 a 193 ± 5 a<br />

Mais Alto 15 ± 0,3 c 25 ± 0,2 c 181 ± 4 c 255 ± 6 c<br />

Me<strong>di</strong>ca Basso 13 ± 0,3 b 24 ± 0,2 b 160 ± 4 b 225 ± 6 b<br />

Me<strong>di</strong>ca Alto 12 ± 0,3 b 24 ± 0,2 b 156 ± 4 b 220 ± 6 b<br />

1 Urine escrete stimate in funzione del contenuto <strong>di</strong> N ureico nel latte<br />

2 Jonker et al., 1998<br />

3 Kaufmann e St-Pierre, 2001<br />

35

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