Biotechnology in Animal Husbandry - Institut za Stočarstvo

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414 N. Mincheva et al. VERMA, S. K. and P. SINGH. (1983): Effect of slow and rapid – feathering genes on economic traits in WL x RIR crosses. Indian J. Anim. Sci. 53: 105 – 106 WILSON, H.R., J.P. JACOP, F. B. MATHER. (2007): Method of sexing day – old chicks. University of Florida, Cooperative Extension Service, USA YOUNIS, H. H. and A.GALAL. (2006): Impact of dwarf (dw), rapid feathering (k + ) and naked neck (Na) genes on growth and egg production parameters of laying hen chickens. Egyptian Poultry Science Journal, Vol. 26 No. 1 pp. 17-38 Received 14 August 2012; accepted for publication 21 August 2012
Biotechnology in Animal Husbandry 28 (3), p 415-424 , 2012 ISSN 1450-9156 Publisher: Institute for Animal Husbandry, Belgrade-Zemun UDC 636.085.8 DOI: 10.2298/BAH1203415T THE EFFECT OF PHASE NUTRITION DURING STARTER PERIOD ON PRODUCTION PERFORMANCES AND NITROGEN CONTENT IN FECES OF BROILERS OF DIFFERENT GENOTYPES N. Tolimir 1 , L. Perić 2 , N. Milošević 2 , M. Đukić – Stojčić 2 , R. Jovanović 1 , V. Bogdanović 3 1 , Institute of Science Application in Agriculture Bulevar Despota Stefana 68b, 11000, Belgrade, Republic of Serbia 2 Faculty of agriculture, University of Novi Sad, Trg Dositeja Obradovića 8, 21000, Novi Sad, Republic of Serbia 3 Faculty of Agriculture, University of Belgrade, Nemanjina 6, 11080 Belgrade, Republic of Serbia Corresponding author: e-mail: ntolimir@ipn.co.rs Original scientific paper Abstract: Objective of the research was to investigate the effect of phase nutrition, i.e. different mixtures used in broiler nutrition with phase reduction of protein cotnent during starter period on production peformances of fattening chickens of diferent genotypes and on nitrogen content in faeces. Differences between groups (treatments) were in the type of mixtures use din starter period, and according to the following program: T1 (control group) – nutrition consisted of mixtures with 23% of proteins in duration from day 1 to 21; T2 – from day 1 to 14, mixture containing 23% of protein was used, and from day 14 to 21, mixture with 20% of proteins; T3 – from day 1 to 7, mixture was used containing 23% of protein and from day 7 to 21, mixture with 20% of proteins; T4 – nutrition with mixture containing 20% of proteins in duration from day 1 to 21. During the trial period (from day 1 to 21) production parameters were followed. Nitrogen content was determined in a collective faeces sample. Results showed that chickens of different genotypes expressed different sensitivity to protein restriction. Comparing the trial groups with the control in the third week, in chickens of Ross 308 provenience significantly lower body weight was registered only in chickens of T4 group with the highest protein reduction. In Cobb 500 chickens, significantly lower body weight was determined in T3 and T4 trial groups. In case of both hybrids, in T2 group, slightly lower body weight was established, but without statistically significant difference compared to the control. Feed conversion in both genotypes was the highest in T3 and T4 treatments. The program of phase nutrition resulted in decrease of the nitrogen content in faeces. Based on obtained data it can be concluded that applied nutrition treatments with drastic protein reduction during starter period in both genotypes had negative effect on production performances.
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