摘要
A study was carried out in the experimental facilities of FMVZ/UNESP-Botucatu, with the aim of following-up the development and the incidence of femoral degeneration (FD). A total of 305 one-day-old male broilers were housed in six pens of 5m2 each. Histological analyses of femur head collected when broilers were 0, 7, 14, 21, 28, 35, and 42 days of age were carried out. At 42 days of age, 30 birds were taken to the experimental processing plant of FMVZ for leg gross examination. Ten legs per FD score where selected, and histologically analyzed to determine the most probable age at the beginning of the lesions, and to standardize femoral degeneration lesion scores. The histological results showed that cell architecture started to disorganize at 21 days of age in the resting and proliferation zones, and that angiogenesis increased, invading the joint cartilage, The gross lesion indexes due to femoral degeneration were 22.5%, 42.5%, and 65% at 28, 35, and 42 days of age, respectively. RESUMEN: Se realiz車 un estudio en las instalaciones experimentales de FMVZ/UNESP-Botucatu, con el objetivo de seguir el desarrollo y la incidencia de degeneraci車n femoral (DF) en pollos. Se utilizaron 305 polluelos de un d赤a, machos, distribuidos en seis corrales de 5m2 cada uno. Se analizaron cortes histol車gicos de cabezas de f谷mur recolectadas a los 0, 7, 14, 21, 28, 35 y 42 d赤as de edad. A los 40 d赤as de edad, se llevaron 30 aves al Matadero Experimental de FMVZ, para an芍lisis macrosc車pico de las piernas. Se escogieron 10 muslos por escore de DF, y se analizaron histol車gicamente para determinar la edad m芍s probable del inicio de la lesi車n y estandarizar los escores de lesi車n por degeneraci車n femoral. Los resultados histol車gicos indicaron que a los 21 d赤as ocurre el inicio de la desorganizaci車n celular en la zona de reposo y de proliferaci車n, adem芍s del aumento de la angiog谷nesis, invadiendo el cart赤lago articular. Microsc車picamente, el 赤ndice de lesi車n por degeneraci車n femoral fue del 22.5%, 42.5% y 65% a los 28, 35 y 42 d赤as de edad, respectivamente.