الفهرس 
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Abstract
1. Introduction
Sheep constitute an important component of livestock production in tropics and subtropics. Ossimi sheep and their crosses are an important local breed groups in Egypt which they dominate in the Upper Delta and the southern part of the Nile valley (Yehia, 2006). Meat yield is an output of lamb’s growth (Ali, 2007). The grazing system with supplement had the advantage to allow producing light lambs saving a high amount of concentrates but achieving similar or even greater average daily gain (ADG) to that registered in dry lot lambs (Carrasco et al., 2009). Alternative production systems are available to complement breed and forage resources that can maximize profitability by improving productivity and carcass characteristics of the sheep operation (Dimsoski et al., 1999).
Livestock production requires constantly finding new opportunities to improve the production results and preserve the health of domestic animals. In the last decade several researches have been done on the possibilities of implementing natural zeolite in livestock production (Masic et al., 1999; Nikkhah et al., 2001; Ilic et al., 2005; Pesev et al., 2005; Ilic et al., 2007and Shariatmandari, 2008) because of its great ability to absorb various harmful substances in the body of animals and the environment (mycotoxins, radionuclides, heavy metals, ammonia, carbon monoxide, pesticides and herbicides).
It helps to achieve better production results and maintain the health and reproductive performance of domestic animals (Adamovic et al., 2001; Dakovic et al., 2003; Medakovic and Zaric, 2005). Also, Stojković (2012) have established that the newborn lambs, that were fed the product based on natural zeolite through colostrum (The amount of 5 g/l of colostrum), had more than 50 percent higher concentration of immunoglobulin (IgG) after the period of six hours. Later, 24 and 48 hours after the birth, the values of IgG also increased, indicating the contribution of these growth promoter in strengthening the immune system of lambs in their first days of life.
This study aimed to investigate the effects of different Management systems (Intensive and semi-intensive) and using Zeolite on Ossimi male lambs growth performance, body measurement, blood metabolites, economic efficiency, carcass traits and some reproductive traits.
2. Review of literature
2.1- Effect of management system on ewes reproductive traits:
2.1.1. Kilograms born per ewe lambed:
Baiomy (2010) stated that birth weight of Ossimi lambs was 3.93 and 3.14 kg, for lambs under intensive and semi- intensive management systems, respectively and there were a significant differences between lambs birth weight means due to management systems effect (P< 0.05). Sultana et al. (2011) found that the birth weight of the Native sheep was 1.56 and 1.6