EFFICIENCY OF UTILIZATION OF PLANT PROTEIN DIETS BY THE BROILER CHICKS | ||
| Journal of Animal and Poultry Production | ||
| Article 1, Volume 27, Issue 10, October 2002, Pages 6613-6627 PDF (4.99 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jappmu.2002.256757 | ||
| Authors | ||
| M. H. Rabie,; Kh. EI. Sherif; F. S. A. lsmail; A. H. Raya | ||
| Department of Poultry Production, Faculty of Agriculture, Mansoura University | ||
| Abstract | ||
| This study was performed to evaluate the performance of broiler chicks fed diets containing different combinations of plant protein sources during the period from 17 to 45 days of age. Five isoenergetic-isonitrogenous diets (ME of about 3000 kcal/kg and CP of about 19%) were formulated and used. Soybean meal (SSM) was used to provide the main plant protein in the control diet. Equal amounts of protein of cottonseed meal (CSM) and corn gluten meal (CGM) were used to replace 25, 50, 75 or 100% of SBM protein in the corn-SSM control diet. Two hundred and ten 17-day- old unsexed broiler chicks were randomly distributed into five equal experimental groups, each with 6 equal replications, kept at the rearing batteries and fed ad libitum their respective mash experimental diets. The growth performance criteria, including live body weight, weight gain, feed intake and feed conversion, were measured weekly and for the entire experimental period. Total mortality and net profit per kg gain were also measured. Nutrient digestibilities of the experimental diets were determined when the birds were 35 days of age. The proximate analyses for representative samples of the experimental diets and excreta were undertaken. Also, crude protein and crude fiber contents of CSM were determined. At the end of study, certain criteria of carcass yield and components and some blood constituents (blood hemoglobin concentrations and serum levels of glucose, total protein, total lipids and cholesterol as well as activities of serum transaminases: AST and AL T) were quantified. The most important results, for the entire experimental period, can be summarized as follows: +- Dietary treatments had no significant effects on either the percentages of carcass yield and components or blood constituents, except blood hemoglobin concentration which decreased significantly in the SSM-free diet group compared with that of the control group. t Dietary treatments did not adversely affect feed intake, feed conversion, net profit per unit of gain or digestibility coefficients of nutrients when up to 50% of SSM protein was replaced by CSM plus CGM. ~ Replacing 75 or 100% of SSM protein with CSM plus CGM resulted in significant decreases in criteria of growth, feed conversion, digestibilities of dry matter, organic matter, crude protein, ether extract and nitrogen free extract and percentages of nitrogen retention, compared with the corresponding values for the control group. In conclusion, when SSM represents the main protein source in plant protein broiler diets, taking the practical, nutritional and economic aspects into account, up to 50% of SSM protein can safely be replaced by equal amounts of protein from both CSM and CGM. The diets also should be well balanced in terms of their contents of all nutrients, particularly, the most limiting amino acids. | ||
| Keywords | ||
| Plant protein sources; broiler diets; growth performance | ||
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