| dc.description | New food sources and raw matters are reclaimed by the quick and uncontrolled
increase of human population and of its higher life standards, as well. Meat is found
on the top of food matters and poultry hybrids could provide high quality meat at
large amount, at relatively low prices and short time and can be easily processed at a
large variety of specific products (Teusan et al., 2009). Nevertheless, there is little
knowledge about the chicken hybrids bred (Cobb-500 and Ross) for meat in
Bangladesh, mainly concerning those aspects related to the muscular growth and
meat characteristics from the carcasses.
Bangladesh provides a very fertile virgin field for broiler chicken farming and is
encouraging new investment in this sector (Rahman, 2007). It is indeed a very
promising and flourishing arena of the country’s economical development
procedure and it is one of the most effective and active factor which make the
globalization concept actually work and strengthen the future economical structure
of the world. | en_US |
| dc.description.abstract | This experiment was undertaken to show the effects of age on muscular growth and meat
characteristics in Cobb-500 and Ross broiler chicken. A total of 288 live birds of both strains were
randomly collected from 16 different broiler farm of Dinajpur, Rangpur and Nilphamari districts at
D1, D7, Dis, Dn, D2g and Ds5. The live birds were carried to the Anatomy and Histology laboratory of
Hajee Mohammad Danesh Science and Technology University, Dinajpur, where the weight of live
birds, carcass, major cut portions (breast, thigh and drumsticks), and total fat were measured by
using electric balance. A part of those Anatomic structures were preserved, processed, sectioned and
stained for histological study as well as the detection inter- and intra-muscular fat deposition,
adipocytes and collagen content, myofiber and adipocyte thickness. All the collected data were
calculated by one sample t-test and then transferred to analytical software SPSS (Version 11.5) for
analysis. The average highest live weight at Dss was recorded 1860.1816.29g in Cobb-500 and
1640.47+7.57g in Ross broiler strains. The average carcasses weights at Di, D7, Dis, Dn, D2g and Dss
were recorded as 14.90 +0.53g, 27.8540.30g, 85.3140.82g, 211.9444.31g, 618.36 +0.92g and
1289.0545.39g¢ for Cobb-500 and in case of Ross strains 12.89+0.41g, 25.8340.38g, 82.09+0.35g,
210.5842.66¢g, 565.5542.41¢ and 1133.8043.51g, respectively. Differences in dressing percentages (DP)
between Cobb-500 and Ross strains were found statistically significant (P<0.01) at Di, D7, Dis and
non significant (P>0.05) at Dx, Dzg and Dss. Highest DP was recorded at Dss which was 69.2940.11¢
in Cobb-500 and 69.12+0.12 in Ross strains. At Di, D7, Dis, Du, D2g and Dss heaviest breast, thighs and
drumsticks were recorded in Cobb-500 in comparison to those of Ross broiler but higher lean: bone
ratio at D7, Dn and Dss and lower fat (%) at Di, Du, Dzg and Dss were recorded in Ross strain. The
length, breadth, thickness and weight of pectoralis thoracis, supracoracoideus, iliotibialis lateralis,
iliotibialis cranialis, biceps brachii and triceps brachii muscles were higher in Cobb-500 at every
studied age. Histologically, the collagen content was lower in breast and thigh muscles at Dz and
thigh muscle at Dss of Ross strain. More intramuscular fat and thicker adipocyte were found in
Cobb-500. The myocytes were thinner in breast muscle and thicker in thigh muscle at D2g and Dss of
Cobb-500 strain in comparison to those of Ross strain. In conclusion, for unique muscular growth
Cobb-500 may be recommended for small scale farming system and for better meat quality Ross
may be suggested to meat industries and consumers. | en_US |
