Broiler civcivlerde canlı ağırlık artışı ve yem tüketiminin triiodotironin (T3) ve tiroksin (T4) ile ilişkisi

Abstract

The study about the relation between the body weights of Broilers chicks and chickens and their serum Triiodothyronine (T`-j) and Thyroxine levels is presented -for this purpose one hundred newborn chicks were used 50 o-f them were Hubbard cross breeds the others were Isa Brown cross-breeds. They were put into.four groups according to their body weights. The research period was eight weeks the di mention o-f the cages was 225 X 100 cm. They were -fed ad libitum. Every chick had its own number. At the end o-f every week (i.e. ?th, 14th, 21st, 35th, 42nd, 49th and 56th days) blood samples were taken and their weights were noted. As a -fact o-f normal development the animals were getting heavier gradually, however serum T^ ancj j levels were variable. The medium weight at the end o-f the -first week was 139.34 g. in the -first group, 152.20 g. in the second group, 145.20 g. in the third group and 135.60 g. in the -fourth group. At the end o-f the last week these values were 2133.00 g., 2266.80 g., 2243.04 gr and 2063.13 gr. Serum T^ levels were on -follows s 0.375 ng/ml, 0.264 ng/ml, 0.280 ng/ml and 0.277 ng/ml at the end o-f the first week and 0.622 ng/ml, 0.438 ng/ml, 0.472 ng/ml and 0.535 ng/ml at the end of the eighth week. Serum T4 levels were as follows s 1.100 %Kg, 1.005 %ffg, 1.008 %Mg, 0.910 %Mg at the end of the first week and 3.004 %ftg, 2.204 %Mg, 2.113 %Mg and 2.383 %Mg at the end of the last week. As a result a valuable correlation between the weights and serum T^ level was found (p<0.05 in the third week, p<0.01 in the eights week). In fact there was on meaningful correlation between serum T^ and j^ levels (p<0.01>, no significant correlation was seen between serum T. levels and the body weights.