Publications

Titles

English :

Growth response of Inshas male chicks to high dietary protein levels during the starter period

Arabic :

استجابة نمو ذكور كتاكيت انشاص للمستويات المرتفعة من بروتين العليقة خلال فترة البادئ

Abstract

Three hundred one day old Inshas male chicks were used to study the growth response to high dietary protein levels during the starter period. The chicks were distributed randomly and divided equally into ten experimental groups. The chicks were fed on one of four levels of protein, 19, 20, 21 or 22% CP either for 4 or 5 weeks of age, then switched to 17% CP diet up to 8 weeks of age. The other two groups were fed on diets containing 17 and 18% CP, respectively from one day old to 8 weeks of age. All diets were similar in their energy contents (2750 Kcal ME /Kg). The last two diets were considered as control diets. All groups were fed on a finisher diet containing 15% CP and 2900 Kcal ME /Kg from 8 to 13 weeks of age. The results of body weight gain and feed conversion values showed that both of 17% and 22% CP diets resulted in lower BWG and worst FC values than those for the other protein levels. During the first 4 or 5 weeks of age, the highest body weight gain values were for the birds fed on 18%, 19% CP diets for 4 weeks or 5 weeks and 21% CP for 4 weeks, while the best feed conversion ratios were for 20 and 21% CP diets fed for 4 or 5 weeks and the worst FC value was for birds fed on 17% CP diet. The results of body weight gain and feed conversion ratio during subsequent periods (0-8, 8-13 and 0-13 weeks) revealed that the highest body weight gain values were for 20% CP for 4 weeks and 5 weeks and 21% CP diets fed for 4 weeks, while best feed conversion ratios were for 20 and 21% CP for 4 weeks. Least feed cost / kg body weight gain, maximum net revenue (LE) and highest relative economic efficiency were for the same groups gave the best feed conversion ratios. There were no significant differences due to protein levels between carcass characteristics values during the first 4 or 5 weeks of age, However the highest dressing percentage was noticed for birds fed on 20% CP diet at both 4 and 5 weeks of age. At the end of the experiment, the results of slaughter test showed that 20% CP or more resulted in higher (P<0.05) dressing percentages than 19%CP and that feeding high protein levels for longer period (5 weeks) or increasing diet protein level decreased abdominal fat. Proximate analysis of whole body of Inshas male chicks revealed that the highest crude protein content and lowest ether extract as percentage of whole body dry matter was for 20% CP diet at 4 weeks of age and 19% CP for 5 weeks. At the end of the experimental period, 19% CP for 5 and 20% CP diet for 4 weeks feeding period, resulted in the highest crude protein content and lowest ether extract. The results may suggest feeding one day old Inshas male chicks during the first 4 weeks of age (starter period) on a diet containing 20% CP and 2750 Kcal ME /Kg diet (C/P ratio of 137.5), then switched to 17% CP and 2750 Kcal ME /Kg diet (C/P ratio of 161.8) up to 8 weeks of age (grower period) and a finisher diet containing 15% CP and 2900 Kcal ME /Kg diet (C/P ratio of 193.3) from 8 to 13 weeks of age to get best growth performance and economic efficiency.

Publication year

2009

Pages

880-897

Availability location

معهد بحوث الانتاج الحيوانى-شارع نادى الصيد- الدقى- الجيزة

Availability number

Organization Name

Animal Production Research Institute (APRI)

City

طابا

serial title