Effect of Different Dietary Energy Levels in the Rearing Periods on Performance and Productive Traits of Laying Hens During the Laying Cycle (19-28 weeks) | ||
| علوم دامی | ||
| Article 17, Volume 29, Issue 112, December 2016, Pages 175-186 PDF (1.11 M) | ||
| Document Type: Research Paper | ||
| DOI: 10.22092/asj.2016.107431 | ||
| Authors | ||
| Mojtaba Vafaeinia; Hossein Moravej; Mahmood Shivazad; Hassan Shirzadi* ; Abdollah Akbarian; S. Khalaji | ||
| University of Tehran | ||
| Abstract | ||
| An experiment was conducted to study the effects of different dietary energy levels in the rearing period on performance and productive traits of layer hens during the laying cycle. 196-day-old layer chicks were randomly assigned to 7 treatments (2400, 2500, 2600, 2700, 2800, 2900 and 3000 Kcal ME/kg), with 4 replicates of 7 birds each. The treatment containing 2800 Kcal ME/kg was considered as the control group. Results showed that feeding different dietary energy levels had no effect on feed intake and weight gain (P>0.05). Even though, feed to egg ratio was increased by reduction of dietary energy levels, decreasing energy levels up to 2400 Kcal ME/kg had no significant effect as compared to control group (P>0.05). Feed intake per dozen eggs and egg number per hen were not affected by reducing energy level up to 2500 Kcal ME/kg, as compared to control group (P>0.05). In addition, diluting the dietary energy up to 2600 and 2700 Kcal ME/kg had no effect on egg production and time of laying commencement, respectively (P>0.05). In conclusion, feeding the treatment containing 3000 Kcal ME/kg, not only improved performance and productive traits, but also increased the average weight of each egg when compared to other treatments (P<0.05). Furthermore, this energy level led to a decreased feed cost per each kilogram of egg (7.25%). Thereupon, it is suggested to apply this energy level in the rearing periods to obtain a desirable performance. | ||
| Keywords | ||
| Metabolizable energy; Egg; productive traits; performance; Laying hen | ||
| References | ||
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