Component Yields and Tibia Characteristics of Broilers as Affected by Feed and Light Restriction

Abstract

McDonald, A.L., Chen, T.C., Lott, B.D. and May, J.D. 2001. Component yields and tibia characteristics of broilders as affected by feed and light restriction. J. Appl. Anim. Res., 20: 1-14.Studies were conducted to deteriniiie the effects of restricted light aiid feed on coinpeiisctory gain in broilers, processing yields, coinpoiieitt distribution and tibia characteristics of broilers. Broiler chicks were p h c e d in 24 pens (60 birds/peii) with sexes separated. Three treatineiits were utilized: 1) ad libitum feed aiid 24 h light (L)(coiitrol); 2) restricted feed ( 9 h / d ) mid 24 h L (RF); and 3) restricted feed (9h/d) and 9L:15D (RLF). After 14 d , all broilers were chaiiged to 24 h L and ad libitum feed. At Weell G, eleven birds of siinilar weight per pen were processed ivith results iiidicatiiig tha.t inale control birds were heaviest. The ready-to-cook (RTC) carcass weights for the coiitrol birds were a.lso higher (PX05). The perceiit head a.iid iieck weights for the R F aiid RLF birds were higher. Females exhibited a, higher percei:t weight for intestine, abdorniiial fat pa.d, liver a i d lower percent 'For corrcspontlencc : Tcl:6(i2-325-3382; Fax: 662-325-8292; c-inail: tcchen~~poultry.insstate.cdu 1 .J. Appl. h i m . Res. New York dressed weight with ]LO treatiiieitt differences. Coiitrol inales exhibited the highest RTC as percent of live weights. The control aird RF females showed the highest total breast weight as percent of RTC, with the control inales exhibiting the highest perceirtage of breast and thigh meat. No differences were observed ainoiig treatineiits Kith regard to percentage solid content or breaking strength of the tibiae. Male tibiae exhibited higher breaking streiigth thait females, but were less dense. This study revealed iio advairtage to the poultry iiidustry or grower i n usirig restricted feediitg or a coinbiiiatioii of restricted feed aiid light.

Effects of ascorbic acid and lighting schedule on tibiotarsus strength and bone characteristics in broilers

“…Tibiotarsus breaking force was not affected by lighting program (INGRAM et al 2000, McDONALD et al 2001. CLASSEN et al (1991) and PRAYITNO et al (1997) respectively reported that intermittent lighting and continuous lighting programs positively affected the breaking force.…”