Umaguing, Bernard S. <br/><br/>
Digestibility and feeding value of abatttoir waste (cattle stomach contents) in broiler diets/ 
Bernard S. Umaguing 
 - Bayombong:  Nueva Vizcaya State Institute of Technology  1995 
 - xvi, 87 leaves :  illustrations, photos ;  28 cm. 
<br/><br/> This study was conducted to examine the possibility of recycling processing cattle stomach contents (CSC) as partial substitute for yellow corn in home-mixed broiler diets. It was first and foremost conducted, in order to set baseline data regarding the probable use of CSC for broiler feed. Specifically, this study was carried out to attain the following objectives: (a) to determine the nutrient composition of the stomach contents from slaughtered cattle; (b) to determine the digestibility of the dehydrated stomach contents by chickens; (c) to evaluate the feeding value of CSC in terms of the birds gain in body weight, feed consumption, and feed conversion ratio: (d) to evaluate the economies of using CSC an partial substitute to yellow corn; (e) to determine the slaughter yield of broilers in terms of dressed weight with and without giblets: and (f) to determine the organoleptic characteristics of the roasted meat of the broilers in terms of color and appearance, tenderness, flavor and taste, Juiciness, and general acceptability.<br/><br/>	The study wan subdivided into four experiments namely. digestibility study, feeding trials. slaughter yield determination, and organoleptic experiment. A combination of statistical tools was used in the study. This includes the use of the Completely Randomized Design (CRD) with five treatments and 4 replications (Experiments 2 and 4), two-factor Factorial Experiment arranged in CRI) (Experiment 3). and regression and correlation analysis to establish the relationship between slaughter yield and weights of head and neck, and shank and feet (Experiment 3). In Experiments 2 and 4. the treatments considered were the different levels CSC in the diets of the birds. In Experiment 3, on the other hand, Factor A involves the sex of the animals while Factor B refers to the different levels of CSC in the experimental diets.<br/><br/>	The varying percentages of yellow corn partially substituted by CSC evaluated were 0% (T1), 2% (T2), 4% (T3), 6% (T4), and 8% (T5).<br/><br/>	The proximate analysis revealed that CSC contains exceptionally high percentage of crude fiber and low gross energy value which translates to a similarly low metabolizable energy value and high amount of nitrogen-free extracts which makes the wastes a good source of soluble carbohydrates for broilers. crude protein of CSC nearly approached that of corn. The total digestible nutrient (TDN) of CSC, on the other hand, compares well with other roughages but fairly concentrates used in animal feeding. <br/><br/>	Results of the feeding experiment revealed that the Incremental weekly gain in weight of the birds in all the treatment during the rearing period was more or less uniform. The birds fed with 8% CSC substituted diet consistently surpassed all the other birds in terms of the absolute value of the weekly gain in weight. Furthermore, in terms of the average total gain in body weight, the same treatment (T5) significantly outweighed all the rest of the treatments while T2. T3. and T4 comparatively performed with the control treatment.<br/><br/>	All the birds in the various treatments consumed statistically the same amount of feeds weekly. This was also the cane considering the total average feed consumption.<br/><br/>	The feed conversion ratio was statistically the same for the control treatment, the birds given diets with 4% CSC substitution (T3). 6% CSC substitution (T4) and 8% CSC substitution (T5). The birds in these treatments needed significantly lens amount of feed to produce a kilogram of meat as compared to the birds fed with diets having only 2% of the yellow corn substituted with CSC.<br/><br/>	In terms of the profit over feed const, the birds given diet with 8% CSC substitution outperformed all the other treatments cert T. Statistically comparable profits over feed cost. however, wore derived from birds in T4. T3. and T1.<br/><br/>	The cost of feed per unit gain in body weight of the experimental birds, on the other hand, wan statistically the came for all the treatments evaluated.<br/><br/>	The slaughter yield determination showed that the sex of the animals, the different levels of CSC. and the interaction of the two factors did not significantly affect the dressing percentage. The weight of head and neck, and shank and feet was found to be linearly and directly or positively related with the live and dressed weight of the experimental birds. The contribution of the former, however, was more pronounced in the liveweight than in the carcass weight. This was individual effect (simple true for both considering the regression) OF aggregate (multiple regression) of the independent variables. <br/><br/>	The organoleptic test revealed that the meat of broilers fed with dehydrated CSC were as good in color and appearance. tenderness, flavor and taste. Juiciness. and acceptability those of the control broilers. They were all rated am very tender, very desirable in appearance, moderately desirable in flavor and taste, moderately Juicy and very acceptable.<br/>  Thesis (Master of Science - Animal Science)<br/> 
<br/><br/>Includes appendices and bibliographical references<br/>