On-line version ISSN 2221-4062
S. Afr. j. anim. sci. vol.38 n.1 Pretoria Jan. 2008
M. MidilliI; Ö.H. MuglaliII; L. AltintasIII; H. ErolI; S. CakirI
IDepartment of Poultry Science, Mudurnu Süreyya Astarci Vocational School of Higher Education, Abant Izzet Baysal University, 14800, Mudurnu, Bolu, Turkey
IIDepartment of Animal Nutrition and Nutritional Diseases, Faculty of Veterinary Medicine, Ondokuz Mayis University, 55420, Kurupelit, Samsun, Turkey
IIIDepartment of Pharmacology and Toxicology, Faculty of Veterinary Medicine, Ankara University, Dişkapi, 06110, Ankara, Turkey
This study was carried out to investigate the effects of dietary inclusion of shelled acorn seed (Quercus cerris) on the growth performance and carcass yield of Japanese quail (Coturnix coturnix japonica). Four hundred four-day old quail chicks were used in this study. Experimental diets contained 0, 5, 10, 15 or 20% shelled acorn seed. The experiment lasted 38 days. There were no differences between treatments in body weight, body weight gain, feed intake and feed conversion ratio. Furthermore, the mortality rate and carcass yield were not affected by the inclusion in the diet of different levels of shelled acorn seed. The inclusion of shelled acorn seed to the quail diets did not cause any harmful effect on the health of the birds. These results suggested that up to 20% shelled acorn seed could be included as an energy source in quail diets.
Keywords: Acorn seed, Coturnix coturnix japonica, growth performance
Feed is the major cost item in the production of poultry meat and eggs. Traditionally the majority of energy in poultry diets consisted of cereals that could also be consumed by humans. Therefore, investigating alternative energy sources not suitable as human food should receive a high priority in research. Acorn, the fruit of the oak tree, is such a new and unconventional energy source (Saffarzadeh et al., 2000).
Few laboratory analyses have been performed on acorns. Proximate analyses have revealed the chemical composition of acorns to be similar to that of chaffy cereals (Wanio et al., 1941; Baumgrass, 1944) with starch being the main component, constituting over 55% of the seed (Wanio et al., 1941). Apparently no chemical analyses have been performed and published on the nutrient content of acorn seed from the different oak species in Turkey. According to De Boer & Bickel (1988) diets containing 25% or more acorn meal produced eggs with coloured yolks and resulted in low hatchability of the eggs. Saffarzadeh et al. (1999) reported that up to 20% acorn seed could replace maize in the diet of laying hens with no serious adverse effects on performance. The result of a trial on the feasibility of substituting maize by rice germ meal, acorns and denatured sugar in the diets of broilers suggested satisfactory technical and economical results only with a one third substitution of maize. Total substitution of maize by the mentioned mixture produced broiler meat with a better taste, but adversely affected all other performance parameters such as growth rate, feed conversion ratio and carcass yield (Cicogena et al., 1972).
The aim of the present experiment was to evaluate the effects of the inclusion of shelled acorn seed at different levels in quail diets on their growth performance and carcass yields.
The representative sample used in this investigation was acorn from the Quercus cerris species, a famous Turkey oak that belongs to the Fagaceae family. The pooled sample of acorns were collected from approximately 300 individual Quercus cerris trees grown at different locations in the Taçkesti district of the Bolu Province of Turkey. Shells were removed from the acorns that have been dried in the sun for about a week. The naked seeds were again left in sun to dry further. Finally, the seed coat (testa) was removed and the remainder was used in the study. The shelled acorn seeds were ground through a 2 mm sieve.
Four hundred four-day old Japanese quail chickens of mixed sex were fed for 42 days on the experimental diets containing 12.6 MJ metabolisable energy/kg and 190 g crude protein/kg. The treatments were: a control without shelled acorn seed and four treatments containing 5, 10, 15 or 20% shelled acorn seed. Diets were formulated to meet or exceed nutrient requirements (NRC, 1994) of quails. The composition of the experimental diets is shown in Table 1.
Each treatment constituted four replicates containing 20 quails each and each replicate was housed in a pen of 60 cm x 40 cm x 20 cm within an experimental poultry house. The birds were weighted and assigned to cages according to a randomized complete design. The facilities were heated electrically. At the onset of the investigation the temperature in the experimental house was 33 °C. Temperature was gradually decreased by about 3 - 4 °C per week to reach 22 °C at 21 days, and then kept at this temperature for the rest of the study. Feed and water were provided ad libitum. Light was provided throughout the day.
The chemical composition of the shelled acorn seed (Quercus cerris) is presented in Table 2. Feed intake, body weight, body weight gain, feed conversion ratio and mortality rate were recorded weekly. Eight quails from each treatment were randomly selected and slaughtered at the end of the experiment to determine the weight and yield of individual cold carcasses.
Nutrient composition of diets and shelled acorn seed was determined according to AOAC (1990). The metabolisable energy values of shelled acorn seed and the experimental diets were estimated from their composition according to Turkish Standard Institute (TSI, 1991). Condensed tannin content of the shelled acorn seeds was determined spectrophotometrically using the Folin-Denis reagent (Waterman & Mole, 1994).
All data were analyzed statistically by one-way ANOVA using a Statistical Computer Program (SPSS, 1999). Differences between treatments were determined using the Duncan's multiple range test (Duncan, 1955) with a 5% level of probability. Effects of dietary treatments on mortality rate were evaluated using the chi square test.
Mean body weights, body weight gains, feed intakes and feed conversion ratios of the experimental groups are presented in Table 3. The weights and yields of the cold carcasses are shown in Table 4. Data in the table demonstrate that dietary inclusion of shelled acorn seed did not influence (P >0.05) parameters examined in this study.
This study was conducted to determine the possibility of using shelled acorn seed obtained from the Turkey oak (Quercus cerris) as an alternative feedstuff in diets of Japanese Quails. Unfortunately, no related study on nutrient values and tannin levels of foliage and acorn seeds of oak species of Turkey could be found in the literature. The chemical composition of acorn seed used in this experiment showed that it contained 67.6 g crude protein/kg, 32.1 g ether extract/kg, 467 g starch/kg, 0.84 g condensed tannin/kg and 11.46 MJ metabolisable energy/kg feed. These values correspond with minimum and maximum values published by Bainbridge (1986). Bainbridge (1986) reported that acorns from 18 different species in the Californian region contained between 23 and 86 g crude protein/kg, 11 to 313 g ether extract/kg, 327 to 897 g soluble carbohydrate/kg and 1 to 88 g tannins/kg. Additionally, metabolisable energy concentrations varied from 11.08 to 24.14 MJ/kg for the 18 acorn species.
In the present study no significant differences were obtained in final body weight, body weight gain, feed intake and feed conversion ratio of the quails consuming the control diet that contained no acorn and those containing 5, 10, 15 and 20% acorn meal. Throughout the experimental period the shelled acorn seed showed no effect (P >0.05) on the mortality rate between treatments, and was 9, 10, 11, 13 and 14% for the 0, 5, 10, 15 and 20% shelled acorn seed treatments, respectively. It was concluded that the tannin content of the shelled acorn seeds did not have any harmful effect on the health of Japanese quails. At the end of the study carcass weight and carcass yield in Japanese quails from the different treatments were compared and no differences were detected between treatments.
Results obtained in the present study suggest that acorn seed up to level of 20% could be included in quail diets. Shelled acorn seeds may be used as an energy source in quail diet and are comparable with those of cereal grains in diets. However, more trials are needed to determine the effect of shelled acorn seeds in diets on the performance of quails with regard to different management conditions, including different stress factors.
This study was supported by The Scientific Research Projects Unit of Abant Izzet Baysal University (pr no: 2003.24.24.181), Turkey.
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