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Articles by Hayam M.A. Abo El- Maaty
Total Records ( 2 ) for Hayam M.A. Abo El- Maaty
  M.H. Rabie and Hayam M.A. Abo El- Maaty
  An experiment was carried out to evaluate the effect of different dietary protein (CP) levels (24, 22 and 20%) with or without enzyme addition on growth performance of Japanese Quail. At two weeks old, quail were randomly distributed into six experimental groups, each with three equal replications and fed their respective experimental diets and managed similarly. The criteria of response were growth performance (live body weight, weight gain, feed intake, feed conversion ratio and crude protein intake), nutrient digestibility, some carcass traits and blood parameters (total protein, total lipids and total cholesterol, ALT and AST). Apart from the effect of dietary enzyme supplementation, decreasing dietary CP level from 24-20% caused significant reductions in growth performance (live body weight, weight gain, crude protein intake and feed conversion ratio) of quail. Added exogenous enzyme achieved beneficial effects on quail growth performance but feed intake was unaffected compared with the controls, regardless of the effect of dietary protein level. Nutrient digestibility coefficients were significantly depressed when dietary CP level was decreased from 24-20% but added exogenous enzyme produced positive effects on digestibility of nutrients examined. Neither dietary protein level nor enzyme addition had an effect on carcass traits or blood parameters of quail. It can be concluded that an optimal dietary crude protein level for growing Japanese quail is 24% from 14-42 days of age. Added exogenous enzyme is suggested to have a positive effect on growth performance of quail fed the low protein diets.
  M.H. Rabie , Hayam M.A. Abo El- Maaty , M.R. El- Gogary and Marwa Sh. Abdo
  This study was undertaken to evaluate the effect of different dietary levels of Canola Meal (CM) on growth performance and histological responses of broiler chicks. Cobb-500 day-old chicks were randomly distributed to five equal treatments, each of three replications. Ten starter and grower CM-diets (0.0, 10, 12.5, 15 and 20%) were formulated and used for 6 weeks. The chicks were kept in brooding and rearing batteries and fed their respective experimental diets. All chicks were managed similarly. The criteria of response were performance, carcass traits, plasma thyroid hormones and histological characteristics of liver and thyroid. Feeding CM-containing diets (up to 15%) did not adversely affect growth performance or carcass traits but relative weight of thyroid was significantly increased. Increasing dietary CM level up to 20% caused significant increases in feed intake, percentages of abdominal fat and thyroid gland but negatively affected weight gain, feed conversion ratio, bursa relative weight and plasma thyroxin concentration compared with the control chicks. Plasma level of triiodothyronine and activity of alanine aminotransferase were not affected by dietary treatments. Activity of plasma aspartate aminotransferase was significantly increased in chicks fed the highest two levels of CM compared with the control ones. The chicks fed the 20% canola meal diets exhibited progressive changes in the liver architecture and thyroid structure. Taking the histological feature of liver and thyroid, plasma thyroid hormones and growth performance into account, it could be concluded that canola meal can safely be included in broiler diets at a level of 15%.
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