FEEDING TRIALS ON DOGS FOR PALATABILITY AND DIGESTIBILITY STUDIES
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1 Chapter FEEDING TRIALS ON DOGS FOR PALATABILITY AND DIGESTIBILITY STUDIES
2 Chapter INTRODUCTION In addition to various parameters palatability and digestibility are important issues in canine nutrition as they determine the consumption and utilization of the food, which finally decide the health of the animal. The health of the animal depends on the nutritional adequacy of their foods and studies on palatability and digestibility help to identify the nutritional requirements of the pet food. Dogs have extra taste buds than cats. In both species the sense of flavor is used to test the palatability of food and to stimulate secretion from the salivary glands, the stomach and sometimes the pancreas. Both dogs and cats usually reject food with a bitter taste. Dogs, however, can taste a sweet sensation better than cats and also detect salty flavors at very low concentrations. Cats experience many amino acids as salty and can associate them with animal proteins. To understand and evaluate the nutritional and palatability effects of pet food containing extruded soybean, experiments were planned as outlined below. I. Criteria for product evaluation II. Palatability studies III. Digestibility studies I. CRITERIA FOR PRODUCT EVALUATION Product effectiveness studies are generally carried out to evaluate the impact of specific changes done in new pet food. The changes may be due to variations in the nutritional parameters or variations in any other quality parameters like palatability or digestibility. To ensure the new products performance focused parameters are considered during product development study. The preference/palatability tests and digestibility tests are the key tests to qualify the new product for release into the market.
3 Chapter Unprocessed soybeans contain many antinutritive factors as discussed in Chapter 01. The impairment of these anti-nutritive factors by extrusion process and their relative levels are discussed in Chapter-04. After extrusion the extruded soybean was included in pet food formulations. Different pet food formulations were done and extruded as pellets and the details are discussed in chapter-05 and chapter-03 respectively. II. PALATABILITY STUDIES Preference studies are normally done to understand the inclination or likeliness of the dog or cat towards the pet food. Palatability is a complex dimension, which includes the animals, breed, palatants in the product, reaction/response by animals and observations by formulators/manufactures. Palatability is one of the important aspects for any food formulator during product development. Even though feeding trials are no longer required for a food to meet the requirements for labeling a food "complete and balanced," palatability studies are required during developing a new pet food. "Preference" and "acceptance" are specific measurement techniques to assist in the investigation of assumed pleasant or unpleasant sensations of food intake. A. Preference test The two-bowl preference test measures "choice" between a pair of test foods that are fed simultaneously side by side. The results of a two-bowl preference test may indicate that animals distinctly prefer one of the foods, thus the preferred food would be termed more "palatable".
4 Chapter B. Acceptance test The one-bowl or monadic method quantifies food acceptance. In most cases this technique is less sensitive' than the two-pan method. Palatability or preference for a food substance depends upon mainly from the following points. Olfactory appeal or freshness of the product Taste (as it affects taste buds) Size and texture of the product which includes crunchiness, chewyness, plasticity and mouth feel Nature of the ingredients - Dosage and nutritional requirement of the product Moisture content Whatever the objectives of a new product may be, the palatability testing in the early stages is made through the comparison between two products. Commonly accepted methods of measuring palatability require calculating a quantitative score based on relative intake of two samples in the target animals like pets. The feeding protocols for the animals, data collection, analysis and comparison are generally associated with feeding trials. In animal palatability tests, the end results are generally expressed as 'better than,' 'worse than,' or 'equal' when two different product samples are selected for palatability testing. C. Palatability test protocol: i. Twelve healthy dogs (9 crossbred and 3 native) were selected and housed separately for palatability studies for twenty days, ii. Dogs were acclimatized for two bowl tests and for daily feeding schedules such as time, quantity and place, iii. The known quantity of two pet foods was offered ad libitum simultaneously to 12 adult dogs in separate bowls along with water, iv. Overall, each pet food consumption was recorded with the swiping of diets in the bowls every day.
5 Chapter VI. The acceptance of the pet food under test was determined as average consumption for the test period The preference of the pet food was calculated based on the first approach to one of the food out of two foods served to the dog. D. Results Table-01: Palatability comparison between Pet food with raw soybean RS-01 and Pet food with extruded soy bean ES-01(cha pter-05). Dog No. Breed Age (months) Average food consumption (g/day) RS ES-01 1 C/B ' 2 C/B ' 3 C/B ' 4 C/B ' 5 C/B ' 6 Native ' 7 Native ' 8 Native ' 9 C/B ' 10 C/B ' 11 C/B ' 12 C/B ' Average consumption (g/dog/day) ' Average consumption % Preference %
6 Chapter Table-02: Palatability comparison between Pet food with 15% extruded soybean (ES- 01) and Ft jt food with 3C '% extruded so ybean (ES-02). Dog No. Breed Age (months) Average food consumption (g/day) ES-01 ES-02 1 C/B C/B C/B C/B C/B Native Native Native C/B C/B C/B C/B Average consumption (g/dog/day) Average consumption % Preference % The comparison of palatability results in table-01 indicated that the average pet food- RS consumption was 20.1 gram/day/dog with 5.3% total consumption levels compared to pet food ES-01 consumption of 351 gram/day/dog with 94.6% total consumption. The palatability comparison of pet foods with 15 and 30% in table-02 indicated that the average consumption of pet food-es-01 was 245 gram/day/dog with 49% total consumption levels compared to pet food ES-02 consumption of 25 5 gram/day/dog with 51% total consumption.
7 Chapter E. Discussion The data in table-01 and table-02 indicated that pet food with extruded soybean was preferred 100% over pet food with raw soybean indicating off flavor in pet food RS. This is also supported by 94.6% consumption levels of pet food ES-01 compared to pet food RS with 5.3% consumption levels. There is clear indication that soybean, if not extruded to impair undesirable compounds such as lipase would contribute to off flavours in soybean products. This observation supports the earlier inspections made by JM Dust and Trivedi^ that palatability can be influenced by flavour, food texture, size and shape. This is evidenced with the preference of dogs to pet food with extruded soybean indicating the absence of unpalatable flavours. This is further confirmed with the trial data as indicated in table-02 where it is demonstrated that both pet foods ES-01 and ES-02 were preferred at the ratio of 55:45. This indicates that there is similarity in palatability of pet food containing extruded soybean. The preference for the pet food with extruded soybean emphasizes the need for the treatment of soybean by extrusion at C to improve its nutritive values. III. DIGESTIBILITY STUDIES Generally the rate of the catabolism of a protein is determined'' by two factors, namely by the rate of its digestion and by that of its absorption as both factors are considered as inherent parts of protein quality. Digestibility studies are done to evaluate the product efficacy, which can be either for maintenance, growth, body condition or any other observations. Usually digestibility trials involve an experiment by which the amount of nutrients actually digested and absorbed from a measured amount of food consumed by animal is determined. The digestibility depends on various parameters like; age of the dog, type of food, level of cooking or gelatinization in the given food and type of ingredients used for the preparation of food etc. The following study data explains the digestibility levels of pet food with extruded soybean.
8 A. Digestibility study protocol: 1. Determination of nutrient value of the pet food by in-vitro analyses^ for crude protein, crude fibre, crude fat, NFE and the total digestible nutrients. 2. Randomization of dogs was done and the dogs were acclimatized for daily feeding schedules such as time, quantity and place, atleast 5 days prior to actual experimentation. 3. The observation for daily food intake and leftover was recorded during acclimatization and collection period. 4. The fecal samples were collected on daily basis for 5 days and placed into labeled plastic bags. Samples were frozen as they were collected. 5. Fecal sample scoring was done based on the following scale Table-03: Fecal evaluation score' Nature of the stool Fecal Hard, dry pellets 1 hard, formed, dry stool that 2 remains firm and soft soft, formed, moist 3 soft, unformed stool that assumes 4 shape of container and is puddinglike watery, liquid that can be poured 5 6. Fecal samples were analysed for moisture (fresh) and pooled fecal samples for nutrient value (dry) example; crude protein, crude fibre, crude fat. NFE and the total digestible nutrients. 7. Proximate analysis was done for pet food and digestibility nutrient study was planned as per the method followed by Blackburn and Southgate' 8. ME values are calculated as per AAFCO quantitative methods. 9. Digestibility co-efficient, Total digestible nutrients were calculated
9 Chapter B. Digestibility results: Table-04: Experimental animal details Dog No. Breed Age (months) B.Wt (kg) Food (g/day) 1 C/B C/B C/B C/B Native Native C/B C/B C/B C/B Average Table 05: Pre-trial investigation results -Pet food Proximate Principle Found Moisture % Crude Protein % Crude Fibre % 1.50 Crude Fat % Ash % 5.90 NFE % Dry Matter% Gross Energy (Cal/g) 4.71 Metabolizable Energy (Cal/g) 3.92
10 Chapter Table 06: Post-trial investigation results: Chemical composition in excreta No. Parameter Average value Found 1 Digestible Dry Matter (DDM) % ± Digestible Crude Protein (DCP) % ± Digestible Crude Fibre (DCF) % ± Digestible NFE (DNFE) % ± Digestible ether extract (DEE) % ± Total Digestible nutrients (TDN) % ± Actual GE utilized Cal/g ± Actual GE excreted Cal/g 1.813± % of GE utilized 61.5± % GE excreted 38.5 ± Metabolizable Energy (ME) K.cal/kg 3531 ± Fecal score Out of % of ether extract estimated, 15.27% is digestible with 91.25% utilization. Estimated crude protein was 33.97% with approximately 26% utilization, indicating protein digestibility coefficient of 76%. The Total Carbohydrates estimated was 43.40%. out of which approximately 41% is digestible with 94.33% utilization. Out of 4.71 cal of gross energy calculated per gram of food, cal/g was absorbed (61.5%) and cal/g (38.5%) excreted in the feces. The metabolizable energy calculated from the fecal matter is approximately 3530 Kcal/kg of food. Fecal output score was 2.5 to 3.5.
11 Chapter C. Discussion: Out often dogs, eight dogs maintained a stable body weight during digestibility trial. The details of the dogs are given table-04. The large variation in breed of the dogs made it difficult to determine any real differences between the breeds so the data were grouped together. The determination was done for nutrient profile of the experimental pet food and excreta and data is indicated in table-05 and 06. It is shown that approximately 60% of the Dry Matter is digestible with 40% excretion. Variation in protein quality and amino acid availability among major protein ingredients and the response to varying levels of inclusion and processing conditions, their availability may be variable among animal meals. Out of % of ether extract estimated, 15.27% is digestible with 91.25%) utilization. Out of 33.97% crude protein estimated, approximately 26%) is utilized, therefore protein digestibility coefficient is 76%). These values are similar to the observations made by J. M. Dust' for various ingredients and their digestibility coefficients in pet food. He discussed that chemical composition and quality of alternative protein sources differ greatly among ingredients within the same category. These observations are also supported by G. C. Fahey, Jr^. and H. S. Hussein'^ where it was discussed that alternative raw materials in pet food tend to vary in their nutrient availability and hence their implications in pet food. Since, the nutrient availability gets influenced by process conditons", maintaining optimum condhions during processing are very critical. By extrusion technology (chapter-04), the antinutritive and undesirable compounds of soybean are inactivated. The Pet food containing such extruded soybean resulted in better palatability compared to the diet containing raw soybean. During digestibility studies it was observed normal fecal score and volume. Hence, extruded soybean can be used in pet food formulations as the antinutritive factors and undesirable compounds are impaired by extrusion process (chapter-04).
12 Chapter As discussed by G. M. Clapper et al^, that fecal bulk and flatulence are the greatest concerns in recommending the soy product inclusion in pet food. In contrast to his observations, as indicated in table-06, the fecal volume and flatulence were observed normal with fecal score^ of 2.5 to 3.5 during pet food feeding trials. This score indicates that fecal matter is hard, formed, dry stool that remains firm and soft and moist. This is due to formulations of pet food with extruded soybean protein and optimum pet food extrusion conditions. 2. Conclusion Soybean processing technologies such as extrusion aids in increased availability of all nutrients due to impairment of antinutritive and undesirable compounds. The digestibility score and the improvement in palatability of pet food containing soybean protein indicate that extruded soybean can be used in pet food diets as nutritive and economical ingredient. Thereby it is inferred that extruded soy protein when formulated with other protein sources that has balancing amino acids can give an economical source of highly available and reliable quality protein to the pets.
13 Chapter References: 1. Anonymous: Guido schroeder, the concept of palatability and digestibility and assessments by means of trials. Companion animal nutrition, 2. J. M. Dust C. M. Grieshop*, C. M. Parsons*, L. K. Karr-Lilientha 1*, C. S. Schasteent, J. D. Quigley, lllj, N. R. Merchen*, and G. C. Fahey, Jr. *1 Chemical composition, protein quality, palatability, and digestibility of alternative protein sources for dogs *University of Illinois at Urbana-Champaign, Urbana 61801; tnovus International, Inc., St. Charles, MO 63304; and JAPC, Ankeny, la Trivedi, N., J. Hutton, and L. Boone Useable data: How to translate the results derived from palatability testing. Petfood Ind. 42: Donald D. Van Slyke and George F. White., the relation between the digestibility and the retention of ingested proteins., the journal of biological chemistry, 1991, page G. M. Clapper. C. M. Grieshop, N. R. Merchen, J. C. Russett, J. L. Brent, Jr., and G. C. Fahey, Jr., Ileal and total tract nutrient digestibilities and fecal characteristics of dogs as affected by soybean protein inclusion in dry, extruded diets J. Anim. Sci. 2001,79: AOAC. Official Methods of Analysis. Assoc. Offic. Anal. Chem., 1995, Washington, DC. 7. N.A. Blackburn, D.A.T. Southgate A.R.C, Food Research Institute, Norwich, UK, protein digestibility and absorption: effects of fibre, and the extent of individual variation. Item of the Provisional Agenda, Joint FAO/WHO/UNU Expert Consultation on Energy and Protein Requirements Banerjee. G.C. A Text Book of Animal Husbandry, 8th edition, 1999, G. C. Fahey, Jr. and H. S. Hussein.. The nutritional value of alternative raw materials used in petfood. Proc. Petfood Forum, pp H. S. Hussein and G. C. Fahey, Jr. Nutrition research with petfood implications. Proc. Petfood Forum, pp
14 Chapter ll.jurgen Zentek, Sonja Fricke, Marion Hewicker-Trautwein, Britt Ehinger, Gunter Amtsberg and Christoph Baums 2004, Dietary Protein Source and Manufacturing Processes Affect Macronutrient Digestibility, Fecal Consistency, and Presence of Fecal Clostridium perfringens in Adult Dogs-'= The American Society for Nutritional Sciences J. Nutr. 134:2158S-2161S, August.
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