الفهرس 
REVIEW OF LITERATUREOnly 14 pages are availabe for public view
Abstract
ABSTRACT
Ahmed Abdelkader Ibrahim Aboamer: Evaluation of Nutritional Systems for Maximizing Milk Production. Unpublished Ph.D. Thesis, Department of Animal production, Faculty of Agriculture, Ain Shams University, 2015.
The aim of this study was to assess the impact of incorporating the nutrient synchrony concept into the traditional least cost ration to be more appropriate to ruminants. Ruminal in situ degradation kinetics of organic matter (OM) and crude protein (CP) for seven feed ingredients were determined using in situ technique and used subsequently with available information about feeding management in order to formulate a synchronous least-cost ration using a new developed software application “Lacto-Sheep”. Fifteen multiparous lactating Barki ewes (35.71 ± 1.75 kg), suckling single were randomly assigned to three groups (5 ewes each). The first group fed the least-cost ration (R1); The second group fed synchronous least-cost ration (R2); The third group fed synchronous least-cost ration with minimal amount of berseem; only one-third of berseem quantity (R3). The calculated synchrony index (SI) for R1 was 0.6 compared with 0.87 and 0.90 for R1 and R2, respectively. Results revealed that R1 had insufficient N to support maximum microbial protein synthesis, over 75% of the day. Although, R2 and R3 were considered to be synchronous, R3 had less total number of hours that predicted N:OM ratios were out of the permissible range of synchronization compared with R2. There were no significant effect of dietary treatment on in OM, CP, CF, NFE digestion coefficients and nutritive values. Both R1 and R2 showed a considerable decrease (P < 0.05) in EE digestibility. Blood serum total protein, globulin, AST and triglycerides concentration were not significantly affected. However, R3 had a significantly higher serum albumin than R1. Feeding on synchronous rations resulted in an increase in serum ALT. group fed on R1 had the lowest serum glucose concentration (32.79 mg/dl). In contrast, R3 had the highest serum glucose concentration (58.58 mg/dl). Serum cholesterol concentration was significantly increased in R3. Daily milk yield and its composition and characteristics did not significantly affected among dietary treatments; however, synchronous least cost ration (R2) had the highest daily milk yield, ECM and milk fat%. Feeding of synchronous diets resulted in an insignificant increase in milk urea-N and significant increase in serum urea-N. group fed on R2 had the highest milk production efficiency. The highest net income (EGP/h/60d) was recorded by the group fed on R2 followed by those fed on R3 then those fed on R1, being 154.08, 140.43 and 80.38, respectively. The proposed synchronous least cost ration was more appropriate for ruminant animals compared with the traditional least cost ration.