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Archivos de medicina veterinaria

versión impresa ISSN 0301-732X

Resumen

EGANA, J.I; MORALES, MARIA SOL; VEGA, H  y  TONELLI, M. Effect of an adaptation period to broiler litter intake on ruminal degradability of dry matter and nitrogenous compounds in sheep and cattle. Arch. med. vet. [online]. 1997, vol.29, n.2, pp.181-188. ISSN 0301-732X.  http://dx.doi.org/10.4067/S0301-732X1997000200002.

The effect of an adaptation period to the consumption of broiler litter (BL) on the ruminal degradability (dgr) was evaluated. The dgr of dry matter (DM), total N (TN), protein N (N x 6.25) and uric acid was determined for 6 BL; 3 BL were obtained during the winter months from sheds with earth floor and 3 during the summer months from sheds with concrete floor. The dgr was measured using the Mehrez & Orskov technique (1997) in 3 heifers and 3 male lambs. The BLs were incubated in 9 x 17 cm dracon nylon bags for 2, 4, 8, 12, 18 and 24 hours in sheep and heifers, and also for 48 hours in heifers. The diet gradually changed from 100% alfalfa hay to a mixture of 60% alfalfa hay and 40% BL (DM base) during a period of 21 days. In the lambs, the dgr of DM, TN and N x 6.25 increased, from 59.9, 80.8 and 71.1 to 82.1, 86.1 and 79.2%, respectively due to the adaptation period (P<0.05). Nevertheless, the dgr of uric acid was similar in both groups of lambs (96%). In heifers, the adaptation period was insufficient to increase the dgr of TN, N x 6.25 and uric acid, but it decreased the dgr of DM from 78.5 to 73.5%

Palabras clave : broiler litter; ruminal degradation; intake adaptation.

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