A Comparative Study of Thai Native Chicken and Broiler on Productive Performance, Carcass and Meat Quality

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A Comparative Study of Thai Native Chicken and Broiler on Productive Performance, Carcass and Meat Quality A Comparative Study of Thai Native Chicken and Broiler on Productive Performance, Carcass and Meat Quality S. Jaturasitha1, V. Leangwunta1, A. Leotaragul2, A. Phongphaew1, T. Apichartsrungkoon1, N. Simasathitkul1, T. Vearasilp1, L. Worachai3, U. ter Meulen4 1. Department of Animal Science, Faculty of Agriculture, Chiang Mai University, Chiang Mai 50200 Thailand E-mail: [email protected] 2 Chiang Mai Livestock Research and Breeding Center, Sanpatong, Chiang Mai. 50120 Thailand 3 Department of Agricultural Economics, Faculty of Agriculture, Chiang Mai University, Chiang Mai 50200 Thailand 4. Institute for Animal Physiology and Animal Nutrition, Georg-August-University, Kellnerweg 6, 37077 Göttingen, Germany. E-mail: [email protected] Abstract: The study of productive performance, carcass and meat quality of Thai Native chicken (N) and Abor Acres broiler (B) was conducted using a completely random design. The native chicken were fed ad libitum with commercial layer diet and the broiler a commercial broiler diet. All chickens were slaughtered at market size, the slaughtered weights of N and B were around 1.2 and 1.9 kg, respectively. Carcass and meat quality of the two different chicken breeds were investigated. The results show that body weight at 0 - 6 weeks, average daily gain and feed intake at 0 – 2, 2 – 4 and 4 – 6 weeks of N were less than those of B (p<0.01). Furthermore, feed conversion ratio at 0 – 2 and 2 – 4 weeks of N were higher than of B (p<0.01) but there was no significant difference at 4 – 6 weeks. The mortality rate of B was higher than of N (p<0.05) at 0 – 2 and 2 – 4 weeks, however, at 4 – 6 weeks there was no significant difference. The feed cost per kg gain of N was higher than of B (p<0.01). Among carcass characteristics the dressing percentage of N was less than of B (p<0.05), in contrast, the percentages of retail cuts in terms of thigh and Pectoralis minor of N were higher compared to B (p<0.05) as well as wing (p<0.01) and drumstick (p<0.05). There was quite similar percentages of internal and external organ. The indirect meat quality in terms of pH value and cooking loss percentage was higher in the case of B (p<0.05). However, thawing loss, drip loss and nutritive value showed no significant difference between the groups. Meanwhile, L and b* values of B was higher than N (p<0.01). The shear value of N in terms of maximum shear force (N), energy (J) and distance (mm) had higher values compared to B (p<0.01). Key word: productive performance, carcass, meat, Native Thai Chicken and broiler Introduction Broiler industry in Thailand is well developed and the country exports the products to European Union and Japan markets generating more foreign exchange than any other livestock industry (Jaturasitha, 2000). The main reasons for this success in satisfying overseas consumers are proper breed, nutrition and management. In Thailand, however, certain consumers have acquired a taste of native chicken. They have presently only a small market but their popularity is rapidly growing. Thai native chickens have traits of fighting cocks including strong and tough muscles, characteristics regarded as quality when compared with the over-tenderness of broiler meat. It is also an alternative for consumers preferring low fat and antibiotic-free white meat. Traditionally, Thai native chickens are raised by small farmers. Their low growth efficiency and poor performance is attributable to lack of proper feed, management, sanitation programs and crucially, breed as farmers generally simply raise them in free range with any feed at hand and without breed selection leading to inbreeding. It is conceptualized that changes in certain farming practice can lead to improved efficiency of Thai native chicken raising. With the presently growing demand and relatively high price of Thai native chicken, this bird’s characteristic traits deserve a thorough study for all fundamental data and information to assure the opportunity for production in commercial and industrial scale. The objective of the present study is therefore to compare the productive performance, carcass and meat quality of Thai native chicken (N) and broiler (B) raised under similar husbandry methods. Materials and Methods Each two hundred one-day old bird of Thai Native (N) and Broiler (B) breeds were arranged in a CRD experiment, with 4 replications of 50 birds. The birds were raised under the same condition. They were fed ad libitum with commercial layer diet for N and commercial broiler diet for B according to Punja (1999): N : 0-6 weeks commercial layer diet with protein 19%, energy 2,900 Kcal/kg : 7-12 weeks commercial layer diet with protein 15%, energy 2,900 Kcal/kg B : 0-3 weeks broiler diet with protein 21%, energy 3,150 Kcal/kg : 4-6 weeks broiler diet with protein 19%, energy 3,150 Kcal/kg All chickens were slaughtered at market size when the slaughtered weights of N and B were ca. 1.2 and 1.9 kg, respectively. Meat quality was evaluated 45 minutes post mortem with pH meter (Model 191, Knick, D-Berlin) according to Jaturasitha (2000). After chilling at 4°C for 24 hours, the right side was dissected to study carcass quality in terms of retail cuts percentage (Jaturasitha, 1991). The pectoralis major (p. major) of the left side was investigated for the following meat quality traits. Color measurement The p. major was put into vacuum polyethene bags for chilling at 4°C for 48 hours and then leaft in refrigerator without bag for one hour before color measurement was undertaken using Chroma Meter (Minolta, CR-300, Osaka, Japan) to record L*, a* and b* values. Water Holding Capacity (WHC) For drip loss, p. major was trimmed at both ends and weighed before and after storage. The sample was hung on a hook in refrigerator for 48 hours at 4°C in an absorption pad and put into polyethene bag. Drip loss percentage is calculated. For thawing and cooking loss, p. major was weighed and put into polyethene bags and frozen at - 20°C until the analysis was to be performed by first thawing at 4°C for 24 hours. Then the sample was absorbed with soft paper until dried then weighed before being put in vaccummed heat resistant plastic bag for boiling at 85°C until the internal temperature reached 80°C and then cooled to room temperature and weighed again. Shear values P. major muscle after cooking loss was evaluated for shear force value. From each boiling sample, 3 cores, in 12.7 mm diameter, 20-22 mm long, were obtained and the shear force was determined using a Warner Blatzler Shear device attached to an Instron Model 5565 Universal test machine. The shear force was determined using 200 mm/min test speed with a 5 kN load cell calibrated to read over the range 0 to 50 N. Nutritive value P. major muscle without fat and tendon was homogenized and analyzed for chemical composition such as % moisture, % protein and % fat (AOAC, 1990). All data of productive performance, carcass and meat quality traits were statistically analyzed by Students’ t-test (Chantalackhana, 1997). The test on differences means was performed by Duncan’s new Multiple Range Test through SAS program for Windows (SAS, 1990). Results and Discussion Productive performance During this study, the average climate temperature was 25°C (Max 32, min 18°C). The results of productive performance were provided in Table 1. The initial weight of N was less than that of B (30.91 vs 44.70 g, respectively; p<0.01). This affected the body weights at 2, 4 and 6 wks which were 90.83 vs 410.88, 213.27 vs 1,186.39 and 435.48 vs 1,997.00g for N and B, respectively (p<0.01). N reached marked size later than B and at 8, 10 and 12 wks the bodyweights were 410.88, 866.20 and 1,197 g, respectively. The average daily gain (ADG) at 0-2, 3-4 and 5-6 wks of N was inferior (p<0.01) compared to that of B (4.24 vs 26.15, 7.32 vs 55.39 and 15.87 vs 57.90 g/day, respectively) whereas, the average daily gain at 7-8, 9-10 and 11-12 wks of N was 15.46, 15.29 and 16.56 g/day, respectively. The feed conversion ratios (FCR) of N at 0- 2 and 3-4 wks was higher than for B (5.20 vs 1.49 and 3.03 vs 1.62, respectively; p<0.01) but there was no significant difference at 5-6 wks (2.09 vs 2.14, respectively). Productive performance in terms of body weight gain, ADG and FCR of N was inferior to that of B. This can be explained by the generally presumption that the birth weight of a bird is ca. 60% of the egg weight (Artamangkul, 2001) and N egg is about 50 g and B 80 g. The breed continued to influence on growth rate particularly N has limitation in feed utilization (Punja, 1999; Thammabut and Choprakarn, 1982) and hence FCR and ADG of B were better in comparison to N (Leotaragul et al., 1997; Theeraphanthuwat et al., 1988). In contrast, the mortality rate of N was lower than B at 0-2 wks (0 vs 1.5%, p<0.05) and at 3-4 wks (1 vs 7.16%, p<0.01). Ensminger (1992) reported that the mortality rate of chicks was high at the first 3 weeks and will be 1% per month.
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