Resumen

ALVAREZ, Ramón  y  COMBELLAS, Jorge. EFFECT OF ADDING WHEAT BRAN, CORN-MEAL AND TALLOW TO BROILERS LITTER ON POST WEANING GROWTH OF BOVINE UNDER RESTRICTED GRASSING. Zootecnia Trop. [online]. 2003, vol.21, n.1, pp.1-15. ISSN 0798-7269.

SUMMARY In order to evaluate the effects of maize meal by-product (MM), wheat middling (WM), and bovine tallow (T) added to poultry litter (PL) on the productive response of yearlings with restricted grazing, an experiment was carried out at the Agronomy Experimental Field in Maracay, Venezuela. A completely randomized design with a factorial 2x2 arrange was used to compare concentrates with 50% PL with or without 4% of tallow and complemented to 100% with the addition of MM or WM. Twenty animals of both sexes were used with 151±17 kg average of initial weight and 12±1.5 months old. The trial lasted for 90 days and the animals were stalled in individual pens and were allowed to graze during four hours on paddocks of Cynodon nlemfuensis grass. Concentrate intake was influenced by either by-product with average daily consumption 0.33 kg/100 kg live weight higher on treatments with WM (P<0.0166). A possible explanation of the lower intake of concentrates with MM is due to higher energy content and its negative effect an intake in diets with high level of concentrate. The high MM starch content and its negative effect on fiber utilization also could have reduced the intake. Live weight gains were not different in diets with WM or MM in spite of the lower intake of the latter, possibly because a higher energy quality of this by product. The addition of T did not affect any of variables analyzed

Palabras clave : Poultry litter; maize meal by-product; wheat middling; yearling.