caa a22 4500 397569246 CHVBK 20180308164836.0 cr unu---uuuuu 161202e199604 xx s 000 0 eng 10.3382/ps.0750547 doi (NATIONALLICENCE)oxford-10.3382/ps.0750547 BARTOV I. Department of Poultry Science, Agricultural Research Organization, The Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel The Use of Diets Containing High Levels of Zinc for Controlling Early Growth in Female Broiler Chicks [Elektronische Daten] [I. BARTOV] A study was carried out with White Rock female chicks to evaluate the possibility of using dietary Zn supplied as ZnO, to control feed intake and weight gain during the period of 1 to 3 wk of age. The levels of supplemental Zn tested were 0, 0.25, 0.50, and 1.0% (Experiment 1); 0, 0.65, 0.75, and 0.85% (Experiment 2); 0.7 and 0.8% (Experiment 3). The effect of Zn supplementation was compared with that of a low sodium chloride diet (L-NaCl-D) and of severe feed restriction (SFR), which was calculated to supply energy only for maintenance (Experiments 1 and 3, respectively). The compensatory growth of the chicks from 3 to 4 wk of age was also evaluated. Feed intake and weight gain were negatively proportional to the levels of dietary Zn supplementation and there were significant (P < 0.02 and P < 0.01, in Experiments 1 and 2, respectively) negative correlations between supplemental dietary Zn levels and relative weight gains (values observed in the unsupplemented diet = 100%). The effects of L-NaCl-D and SFR on decreasing weight gain were calculated, according to the equations obtained in Experiments 1 and 2 to be equivalent to these of 0.58 to 0.65% and 0.78 to 0.87% Zn supplementation, respectively. Relative weight gain and feed efficiency of the chicks from 3 to 4 wk of age, after withdrawal of the growth-depressing factors, were positively related to the degree of growth depression during 1 to 3 wk of age; however, the intensity of recovery from a similar degree of growth depression induced by L-NaCl-D, SFR, or dietary Zn was least in the last mentioned treatment. It is concluded that dietary Zn supplementation can be used as an efficient tool for controlling early growth of young broiler breeder chicks. © 1996 Poultry Science Association, Inc. Metabolism and Nutrition nationallicence female broiler chicks nationallicence early growth depression nationallicence dietary zinc nationallicence feed restriction nationallicence compensatory growth nationallicence Poultry Science Oxford University Press 75/4(1996-04), 547-550 0032-5791 75:4<547 1996 75 ps https://doi.org/10.3382/ps.0750547 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.3382/ps.0750547 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- BARTOV I. Department of Poultry Science, Agricultural Research Organization, The Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel NATIONALLICENCE 773 0- Poultry Science Oxford University Press 75/4(1996-04), 547-550 0032-5791 75:4<547 1996 75 ps Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford