Retention of protein and fat in the meat of fast and slow-growing chickens fattened to higher age
2001
Zelenka, J. | Fajmonova, E. | Komprda, T. (Mendelova Zemedelska a Lesnicka Univ., Brno (Czech Republic))
In a trial with fast-growing cockerels of hybrid combination Ross 208 (FG) and slow-growing (SG) hybrids Isa Brown, basic production parameters and content of dry matter, protein and fat in breast and thigh meat were investigated in the course of fattening in the age interval from the 5th to the 18th week. Chickens were fed a mixture containing a high level of crude protein. In FG group, the changes in the content of dry matter, protein and fat in breast meat, and dry matter and fat in thigh meat were not significant, while the content of protein in thigh meat increased significantly (P 0.01) with the age. In SG group the content of dry matter and fat in breast meat increased significantly (P 0.01), other values did not change. In FG chickens the weight of breast meat, thigh meat and protein content in breast and thigh meat increased by 25, 20, 28 and 24 % and in SG group by 18, 13, 26 and 14 % faster than their body weight; the increase in fat deposition in breast meat of FG and SG groups was slower by 16 and 30 %, respectively. In FG group a relative increase in fat content in thigh meat was lower by 8 % while in SG group it was higher by 9 % than the growth rate of chickens.
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