The Effect of Different Enzyme Substrates on the Performance of Broilers Fed Peeled Cassava Root Meal (Pcrm) Based Diet
Chapter One
Study Objectives
The objectives of the study are as follows:
- To evaluate the performance of broilers fed different enzyme substrates in peeled cassava root meal based
- To investigate the carcass quality of broilers fed different enzyme substrates in peeled cassava root meal based diets
- To investigate the nutrient retention of broilers fed different enzyme substrates in peeled cassava root meal based
CHAPTER TWO
LITERATURE REVIEW
Utilization of cassava in Poultry feeding
Since the early 1930s cassava has been known and used as a livestock feed substitute instead of grains for poultry rations. The first large- scale commercial users and adopters of cassava as a livestock feed resource were livestock farmers of the European Economicย Communityย (EEC).ย Cassava as a substitute resource in livestock feeds became fashionable first because of its relative cheapness compared with grains (especially corn) and later because of the increased demand of corn for human and other industrial uses such as in textiles, breweries and bakeries.
Several nutritional and feeding experiments on the potentials of cassava as a substitute for grain have been carried out since the time Tabayoyong (1935) first incorporated 30% and 60% levels of cassava starch extract into chicken diets. Major findings of studies by McMillan and Dudley (1941), Klein and Barlowen (1954). Vogt and Penner (1963), Vogt and Stute (1964), Vogt (1966), Barrios and Bressani (1967), Enriquez and Ross (1967), Olson et al. (1968),ย Gadelha et al. (1969),ย Rendon et al.ย (1969),ย Montillaย et al. (1969), Olson et al. 1969, Montilla (1970), Maust et al. (1972), Chou and Mรผller (1972), Armasย and Chicco (1973), Mรผller et al.ย (1974), Hutagalung etย al. (1974), Phuah and Hutagalung (1974), Montilla et al. (1975), Adegbola (1977), Obiora (1978), Squibb and Wyld (1951), and Adesida (1979) may be summarized as follows:
- Cassava can be substituted as a feed ingredient for corn and/or other grains without negatively affecting poultry feed
- The nutritive content and value of cassava meal in livestock feed depends on the cassava variety used, the age of the cassavaย tuber, and the processing technology used in producing the cassava
- Low-HCN cassava varieties (sweet) are preferred by chickens to high- HCN cassava varieties (bitter).
- Levels of substitution of cassava for grain higher than 20% produce deleterious effects on the health of chickens and cause reduction in weight gain and feed conversion efficiency, especially after the fourth week.
- Excessively fine (powdery) nature of cassava flour influences the feed intake negatively and diminishes consumption of cassava
CHAPTER THREE
MATERIALS AND METHODS
Location
The experiment was carried out at the Poultry Unit of the Departmentย ofย Animal Science Research and Teaching Farm, University of Nigeria, Nsukka.
Materials
Peeled cassava root meal (PCRM), maize, exogenous enzymes, other feed ingredients and additves used for the study were obtained from different locations within and outside Nsukka Local Government Area, Enugu State.
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CHAPTER FOUR
RESULTS AND DISCUSSION
Average Daily Feed intake (ADFI) of Broilers fedย Differentย Levels of PCRM Diets with Different Enzyme
The impact of different levels of PCRM and different enzyme substrates on the average daily feed intake (ADFI) of broilers are shown in Table 3. Atย both the starter and finisher stages (15-36d and 37-58d) and on cumulative basis (15-58d), there were significant (P < 0.05) PCRM level main effects. Atย the starter stage, chicks on diets containing 50% PCRM had higher (P < 0.05) ADFI than chicks on 0% PCRM and 75% PCRM diets. Chicks on diets containing 0% PCRM had the lowest (P > 0.05) ADFI. At the finisher stage, birds on diets containing 0% PCRM had higher (P < 0.05) ADFI than birds on 50% PCRM and 75% PCRM-based diets. However, birds on 75% PCRM had the lowest (P > 0.05) ADFI value. On cumulative basis, birds on 50% PCRM diets had the highest (P < 0.05) ADFI while bird on 75% PCRM had the lowest (P > 0.05) ADFI value.
At both starter and finisher stages (15-36d and 37-58d) and on cumulative basis, there were significant (P < 0.05) enzyme typeย main effects.ย At the starter stage, chicks on diets containing Roxazyme Gย hadย the highestย (P < 0.05) ADFI while chicks on diets withoutย enzymeย supplementationย had the lowest (P > 0.05) ADFI value. At the finisher stageย andย on cumulative basis, bird on diets supplemented with Roxazyme G had theย highestย (Pย < 0.05) ADFI while bird on diet without enzyme supplementation had the lowestย (P > 0.05) ADFI.
CHAPTER FIVE
SUMMARY, CONCLUSION AND RECOMMENDATION
ย Summary
The experiment studied the effect of two enzyme substrates (Nutrase xyla and Roxazyme G) on the performance of broilerย chicksย (fromย 2-10ย weeks) fed peeled cassava root meal (PCRM)l at the inclusion levels of 0, 50 and 75%. During the Starter and Finisher phases, weekly measurenent were kept on feed intake(g) and weight(g) from which average daily feed intake (ADFI), average daily weight gain (ADWG), feed conversion ratio (FCR) and feed cost per Kg weight gain (FC/kgWG) were computed to determined which level of peeled cassava root meal with or without enzyme substrates gave the best economic advantage. Nutrient retention trial was undertaken at the 8th week. The proximate analysis of experimental diets and droppingsย wereย carried out. Also, the gross energy value of the experimental diets as well asย the excreta were assayed. The protein, ether extract,ย dry matter coefficients and metabolizable energy were calculated to determined the percentage nutrient retention. Carcass and edible organs evaluation were carried out. Dressed weight was calculated. Also, heart, liver and gizzard asย percentageย ย ย of dressed weight were computed. Nutrase xyla and Roxazyme G supplementation increased ADFIย in the starter and finisher phase at all levelsย of PCRM inclusion (P<0.05). The effect of Nutrase xyla and Roxazyme G supplementation on FCR was positvely significant in the finisher phase (P<0.05). Roxazyme G supplementation diet at 50%ย PCRMย hadย theย best least cost value in terms of feed cost per kg weight gain. There wasย an increase in dressed weight percentage of birds fed Nutrase xyla and Roxazyme Gย supplementedย dietsย atย 50%ย PCRMย (P<0.05).ย Nutraseย xyla and Roxazyme G supplemented diets had no significant effect (P>0.05) on protein retention but had significant effect (P<0.05) on etherย extract,ย dryย matter and metabolizable energy retention. Nutrase xyla and Roxazyme G supplemented diets had no significant effectย (P<0.05)ย onย edibleย organs (heart, liver and gizzard).
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